Technical ReportPDF Available

POOLHEAT 5.10 SWIMMING POOL HEAT LOAD ANALYSIS AND HEATER SIZING

Authors:

Abstract and Figures

POOLHEAT is a thermal analysis package for evaluating temperatures and energy flows in indoor and outdoor swimming pools. Operating characteristics can be determined for pools with the following heating systems  Unheated outdoor pool.  Gas heating.  Heat pump heating.  Solar collector heating.  Solar collector heating with gas or heat pump backup. The thermal analysis is based on procedures defined in Australian Standard AS3634 "Solar Heating Systems for Swimming Pools" and International Standards Organisation report TR12596 “Solar heating - Swimming pool heating systems - Dimensions, design and installation guidelines” POOLHEAT output includes monthly summaries of water temperatures (minimum, average and maximum) and the following energy flows  Direct solar heating of outdoor pools, with allowance for shading, local wind conditions and pool covers.  Modes of heat loss (evaporation, convection, radiation, make-up water heating and back flushing).  Heating system input.  Air heating load for indoor pools.  Humidity conditions in the pool enclosure. PROGRAM FEATURES  Heating system analysis for gas, heat pump and solar heat source.  Weather data for a large number of locations.  Pool design features.  Effect of number of users on heat loss due to evaporation.  Sizing of heating system to meet required temperature specifications.  Minimum and maximum pool temperatures for a specified heating system capacity.  Effect of pool covers for both indoor and outdoor pools.  Ventilation analysis of pool building for indoor pools.  Solar collector efficiency characteristics of a specific solar collector or use one of 32 collector and roof types defined in the program. Outdoor pools Pool shading. Exposure to wind. Pool cover. Over temperature control. Heater capacity required for a specified operating temperature or for a specified heating system capacity. Indoor pools Monthly pool heating requirements. Pool cover. Ventilation analysis of pool building. Temperature and humidity levels in the pool building. Space heating requirements. Solar collector heating Collector efficiency data for 32 collector/roof combinations or user defined solar collector efficiency. Solar collector types include plastic extrusions, flat plate and evacuated tube collectors
No caption available
… 
No caption available
… 
No caption available
… 
No caption available
… 
Content may be subject to copyright.
POOLHEAT 5.10
SWIMMING POOL HEAT LOAD ANALYSIS
AND HEATER SIZING
23 July 2016
Thermal Design Pty Ltd
26 Hopetoun St
Paddington 2021
Australia
g.morrison@tpg.com.au
0425 212 218
POOLHEAT 5 Swimming Pool Heat Load Analysis 1
Thermal Design Pty Ltd
SOFTWARE INSTALLATION ..................................................................................................................................... 2
SETUP PROCEDURE TO INSTALL A DESK TOP ICON FOR POOLHEAT ........................................................ 2
TO START POOLHEAT ......................................................................................................................................... 2
.INTRODUCTION ....................................................................................................................................................... 2
PROGRAM FEATURES ............................................................................................................................................ 4
Outdoor pools ......................................................................................................................................................... 4
Indoor pools ........................................................................................................................................................... 4
Solar collector heating ............................................................................................................................................ 4
WEATHER DATA LOCATIONS ................................................................................................................................. 5
PROGRAM OPERATION OVERVIEW ....................................................................................................................... 7
ANALYSIS .............................................................................................................................................................. 7
PROGRAM OPERATION ........................................................................................................................................... 8
DATA ENTRY PROCEDURE ................................................................................................................................. 9
INDOOR/OUTDOOR POOLS ................................................................................................................................ 9
RESULTS ............................................................................................................................................................... 9
SELECTING FORMS ........................................................................................................................................... 11
LOCATION ........................................................................................................................................................... 11
DESIGN ............................................................................................................................................................... 12
Infinity edge area ............................................................................................................................................. 12
Water fall surface area ..................................................................................................................................... 12
Cover ............................................................................................................................................................... 13
Pool Usage ...................................................................................................................................................... 13
Flushing and evaporation make-up .................................................................................................................. 13
ENVIRONMENT ................................................................................................................................................... 14
Outdoor environment............................................................................................................................................ 14
Shading ............................................................................................................................................................ 14
Wind exposure ................................................................................................................................................. 14
Indoor environment .............................................................................................................................................. 15
Ventilation ........................................................................................................................................................ 15
Exhaust fan ...................................................................................................................................................... 16
Humidity ........................................................................................................................................................... 16
Air Heating ....................................................................................................................................................... 16
HEATING SYSTEM.............................................................................................................................................. 17
Heating system capacity analysis .................................................................................................................... 17
Solar collector efficiency .................................................................................................................................. 18
Heat pump specification ................................................................................................................................... 20
Gas heater specification .................................................................................................................................. 22
Solar heater specification ................................................................................................................................. 23
Solar collector area .......................................................................................................................................... 23
Gas and electricity tariffs .................................................................................................................................. 27
Billing Months................................................................................................................................................... 29
JOB DETAILS ...................................................................................................................................................... 30
RESULTS ............................................................................................................................................................. 31
ANALYSIS OF RESULTS IN EXCEL ....................................................................................................................... 33
EXCEL TEMPLATE.............................................................................................................................................. 34
Summary of steps for loading new data into the EXCEL templates ................................................................. 36
REFERENCES ......................................................................................................................................................... 36
POOLHEAT 5 Swimming Pool Heat Load Analysis 2
Thermal Design Pty Ltd
POOLHEAT LICENSE CONDITIONS
The POOLHEAT license covers installation by the licensee at one site only.
By installing this software you acknowledge that Thermal Design assumes no responsibility or
liability for the accuracy of the program or for the results which may arise from its use.
SOFTWARE INSTALLATION
Installation is a three step process
1. Run the program setup.exe
2. Copy the file license.dat to the POOLHEAT installation directory.
3. Copy the weather data files *.TMY to the POOLHEAT installation directory.
SETUP PROCEDURE TO INSTALL A DESK TOP ICON FOR POOLHEAT
Press the right mouse button when pointing at the windows desk top
select new
select shortcut
select browse
locate the file POOLHEAT.NET.EXE
select open
An icon will be placed on the windows desk top
TO START POOLHEAT
Click on the POOLHEAT windows icon
or use the Windows explorer to find and run POOLHEAT.NET.EXE in the directory you
selected during installation.
NOTE: When running under Vista or Windows7 the windows feature “User account control”
must be turned off. It may also be necessary to set Poolheat to run as administrator see
separate instructions.
.
POOLHEAT 5 Swimming Pool Heat Load Analysis 3
Thermal Design Pty Ltd
INTRODUCTION
This document outlines the operation of the POOLHEAT simulation program for evaluating
the performance of swimming pool heating systems.
POOLHEAT is a thermal analysis package for evaluating temperatures and energy flows in
indoor and outdoor swimming pools. Operating characteristics can be determined for pools
with the following heating systems
Unheated outdoor pool.
Gas heating.
Heat pump heating.
Solar collector heating.
Solar collector heating with gas or heat pump backup.
The thermal analysis is based on procedures defined in
Australian Standard AS3634 "Solar Heating Systems for Swimming Pools"
and
International Standards Organisation report TR12596 “Solar heating - Swimming pool
heating systems - Dimensions, design and installation guidelines”
POOLHEAT output includes monthly summaries of water temperatures (minimum, average
and maximum) and the following energy flows
Direct solar heating of outdoor pools, with allowance for shading, local wind
conditions and pool covers.
Modes of heat loss (evaporation, convection, radiation, make-up water heating and
back flushing).
Heating system input.
Air heating load for indoor pools.
Humidity conditions in the pool enclosure.
POOLHEAT 5 Swimming Pool Heat Load Analysis 4
Thermal Design Pty Ltd
PROGRAM FEATURES
Heating system analysis for gas, heat pump and solar heat source.
Weather data for a large number of locations.
Pool design features.
Effect of number of users on heat loss due to evaporation.
Sizing of heating system to meet required temperature specifications.
Minimum and maximum pool temperatures for a specified heating system capacity.
Effect of pool covers for both indoor and outdoor pools.
Ventilation analysis of pool building for indoor pools.
Solar collector efficiency characteristics of a specific solar collector or use one of 32
collector and roof types defined in the program.
Outdoor pools
Pool shading.
Exposure to wind.
Pool cover.
Over temperature control.
Heater capacity required for a specified operating temperature or for a specified heating
system capacity.
Indoor pools
Monthly pool heating requirements.
Pool cover.
Ventilation analysis of pool building.
Temperature and humidity levels in the pool building.
Space heating requirements.
Solar collector heating
Collector efficiency data for 32 collector/roof combinations or user defined solar
collector efficiency.
Solar collector types include plastic extrusions, flat plate and evacuated tube collectors.
POOLHEAT 5 Swimming Pool Heat Load Analysis 5
Thermal Design Pty Ltd
WEATHER DATA LOCATIONS
POOLHEAT uses hourly records of solar radiation, ambient temperature, ambient humidity
and wind speed. Available locations include :
Amberley
Queensland
Melbourne
Victoria
Brisbane
Mildura
Cairns
Sale
Longreach
Hobart
Tasmania
Mt Isa
Launceston
Oakey Army
Adelaide
South Australia
Rockhampton
Mt Gambier
Townsville
Oodnadatta
Broken Hill
New South Wales
Woomera
Cobar
Darwin
Northern Territory
Coffs Harbour
Alice Springs
Lightning Ridge
Albany
Western Australia
Moree
Broome
Nowra
Carnarvon
Orange
Corrigen
Richmond
Forrest
Sydney
Geraldton
Tamworth
Hall’s Creek
Wagga Wagga
Kalgoorlie
Williamtown
Perth
Canberra
ACT
Port Hedland
POOLHEAT 5 Swimming Pool Heat Load Analysis 6
Thermal Design Pty Ltd
New Zealand
Auckland
Alexandra
Christchurch
New Plymouth
Wellington
Europe
Lisbon
Portugal
Madrid
Spain
Marseille
France
Paris
France
Middle East
Abu Dhabi
United Arab Emirates
Dubai
United Arab Emirates
Indonesia
Bandung
Java
Data files for locations not listed in the above table can be generated for locations for which
meteorological data is available. Contact Thermal Design at t_design@tpg.com.au for
additional weather data.
POOLHEAT 5 Swimming Pool Heat Load Analysis 7
Thermal Design Pty Ltd
PROGRAM OPERATION OVERVIEW
The program input screens are selected by clicking on the menu items along the top of the
screen. Numerical values can be changed by over-typing after selecting the item with the
mouse. Select options from lists by pointing with the mouse and pressing the left mouse
button.
To save the input data to a specified file name, select File - Save before you run a simulation.
The results will be saved to a file with the name specified in the save operation, with file type
.RES. If the File - Save option is not used the input data and results will be saved in file names
DEFAULT.DAT and DEFAULT.RES.
The program calculates pool heat loss and heating system inputs using a small time step
thermal simulation model.
After an annual performance calculation has been completed the results can be viewed by
selecting Result from the top menu bar. The pool temperature and purchased energy use can be
selected from the tabs on the result window. The full results are displayed in a text result file
that may be viewed and printed by selecting the Result Summary tab in the result window. The
result file is in standard text format and may be read into a word processor document (use
Courier font so that table items line up) or viewed out of POOLHEAT by using Notepad.
A comma separated variable result file is also produced; this data can be copied into EXCEL
templates supplied with POOLHEAT (different templates for indoor and outdoor result files).
The templates have prepared graphs of pool temperatures, energy flows and indoor space
conditions etc throughout the year.
ANALYSIS
The analysis in POOLHEAT follows the procedures specified in Australian Standard AS3634
and International Standards Organisation report TR12596. As a large number of alternative
design, operating conditions and usage levels may be specified the applicability of a given
result rests with the user. By installing this software the licensed user acknowledges that Thermal
Design assumes no responsibility or liability for the accuracy of the program or for the results which
may arise from its use.
POOLHEAT 5 Swimming Pool Heat Load Analysis 8
Thermal Design Pty Ltd
PROGRAM OPERATION
The startup screen is shown below
FILE : The default file name is DEFAULT, results are saved to the file DEFAULT.RES
unless the input data has been saved to a new file name before the Run command is selected.
POOLHEAT 5 Swimming Pool Heat Load Analysis 9
Thermal Design Pty Ltd
DATA ENTRY PROCEDURE
For a new evaluation the sequence of operations would be
select the location by selecting the menu item
enter parameters using the Design, Environment, Heating and Tariff screens.
save the input data using the File - Save operation.
select Run. (results will be written to the file name specified in the File - Save
operation).
The data entry procedure for modifying a previously saved case would be
use the File - Open operation to load the previous data file
edit the parameters using the Location, Design, Environment, Heating and Tariff
screens.
save the new data using the File - Save operation and enter a new file name.
select Run. (results will be written to the file name specified in the File - Save
operation).
FILE NAME
The current file name is displayed under the File button
INDOOR/OUTDOOR POOLS
The parameters for indoor or outdoor swimming pools are selected in the Environment
window. The Environment window changes for indoor or outdoor.
RESULTS
Selecting the Results button on the top menu bar will display the results file, the full results
record may be printed by selecting the print button at the top right of the result screen. The
result file may also be read into a word processor document (use Courier font to line up table
columns).
POOLHEAT 5 Swimming Pool Heat Load Analysis 10
Thermal Design Pty Ltd
RUN
Selecting the Run button on the top menu bar will start the annual performance evalaution.
The run time is typically less than 1 minute for an outdoor pool and longer for an indoor pool
depending on the computer speed. The simulation progress is displayed during the analysis.
POOLHEAT 5 Swimming Pool Heat Load Analysis 11
Thermal Design Pty Ltd
SELECTING FORMS
There are eight forms for defining the swimming pool and heating systems configuration.
Location selection of weather data
Design - swimming pool parameters
Environment - swimming pool operating environment
Heating -(solar, gas or heat pump or combinations
Tariff - electricity and gas supply tariffs and costs
Job Details - record of customer information and job notes
Run start calculation of annual performance
Result view the result pages and print the result summary file.
LOCATION
The location screen lists the weather data files in the working directory. Select the location
from the list by pointing with the mouse or use the up/down arrow keys.
POOLHEAT 5 Swimming Pool Heat Load Analysis 12
Thermal Design Pty Ltd
The particular locations listed will depend on the weather data files that have been included
with your version of POOLHEAT. Additional weather data files can be obtained from
Thermal Design.
DESIGN
The design screen is used for describing the pool size and operating features.
Infinity edge area
The infinity edge area is the surface area of water over a shallow edge of the pool.
Water fall surface area
The water fall surface area refers to a water fall or pool feature over which water is flowing.
The area is the water surface area exposed to the atmosphere, for a free falling water fall the
POOLHEAT 5 Swimming Pool Heat Load Analysis 13
Thermal Design Pty Ltd
surface area is the sum of the front and back areas. For water flowing down a slide etc the
surface area would be the top area only.
Cover
If a cover is specified it is assumed to be fitted when the pool is closed.
Pool Usage
The number of swimmers in the pool each day is used to compute the water evaporation as a
function of pool use.
NOTE: The level of usage of a pool can have a significant effect on the evaporation heat loss.
If the size of a pool is changed the Pool Usage input should also be changed.
Flushing and evaporation make-up
The pool energy balance includes the effect of the addition of mains water to compensate for
evaporation and filter flushing. The temperature of mains water is included in the weather data
file where it is known (ref 1). If the mains water temperature is not known for the location
selected it is taken as the average air temperature in the previous month.
POOLHEAT 5 Swimming Pool Heat Load Analysis 14
Thermal Design Pty Ltd
ENVIRONMENT
The environment screen is used for setting the conditions in which the pool is operating.
Outdoor environment
Shading
Specify typical shading of the pool water surface due to surrounding buildings or trees in
winter, or select
User defined shading to specify month by month shading levels
In the monthly shade specification box enter 100 for full shade and 0 for no shade on the pool
during the middle 6 hours of the day in winter and middle 8 hours of the day in summer.
Wind exposure
Specify the typical ground level wind condition for an outdoor pool as either
Sheltered location, ie wind breaks fitted around the pool.
Open position.
Exposed windy location.
POOLHEAT 5 Swimming Pool Heat Load Analysis 15
Thermal Design Pty Ltd
Indoor environment
Ventilation
Specify the minimum day time ventilation rate of the pool space, in air changes per hour. A
minimum of 2 air changes per hour would be required for comfort. Also specify the maximum
day time ventilation rate of the pool space in air changes per hour. The ventilation rate is
varied during the operating period in order to maintain the specified day time humidity level.
If the indoor humidity level is less than the set point humidity the minimum ventilation rate is
used. If the indoor humidity is higher than the set point the ventilation flow rate is increased
(up to the specified maximum) until the set point humidity is achieved. If the outside humidity
is higher than the indoor humidity set point the maximum air flow rate is used.
POOLHEAT 5 Swimming Pool Heat Load Analysis 16
Thermal Design Pty Ltd
Outside of the operating hours the ventilation fans are turned off.
Exhaust fan
Specify the ventilation capacity of the exhaust fan in air changes per hour. The exhaust fan is
assumed to operate when the indoor humidity exceeds the humidity set point.
At night the humidity exhaust fans are turned off if the indoor humidity is less that the night
time humidity set point. If evaporation from the pool causes the indoor humidity to rise above
the night time set point, the humidity exhaust fans are turned on (ventilation fans remain off).
Humidity
Specify the desired humidity of the pool enclosure during pool opening hours. If the outside
humidity and restrictions on ventilation rates do not allow this value to be maintained then the
program computes the actual inside humidity condition.
Specify the desired humidity of the pool enclosure outside of pool opening hours. This value
should be high to minimise night time heat loss from the pool however, condensation on the
walls must be considered when a high value is specified.
Air Heating
Specify if the fresh air to the pool enclosure is heated. If heating is used specify the set
temperature of the air heating system. If night time air heating is not required specify a low
night time set temperature.
Air heating is supplied by the same heat source as for pool water heating.
POOLHEAT 5 Swimming Pool Heat Load Analysis 17
Thermal Design Pty Ltd
HEATING SYSTEM
The heating system screen contains a series of menus for specifying the heating system
parameters. A menu of types of heating systems can be selected from a pull down menu in the
top right corner of the heating system screen (click on the down arrow).
The primary heating screen changes in response to the type of heating system selected.
If multiple heating systems are specified (eg solar and gas) there are two heating system
screens, the toggle between the two screens will appear at the top of each of the screens.
The solar heating input has three levels of input menus, the solar collector efficiency can be
specified in terms of measured performance (ref 4) or a specific solar collector type and roof
system may be selected from a built in list of 32 types of solar heating systems (ref 3).
Heating system capacity analysis
The heat pump or gas heater capacity may be specified or the program used to compute the
capacity required to meet the design temperature specification. If the capacity is not specified
the program will list the average capacity over the month required on the basis of 24hr
operating time (or maximum possible operating time if the start and stop times are specified).
If the minimum pool temperature is critical then the effect of specifying the listed capacity can
be checked by entering it as the specified capacity and running the analysis again to determine
the minimum temperature during each month for this capacity.
POOLHEAT 5 Swimming Pool Heat Load Analysis 18
Thermal Design Pty Ltd
Solar collector efficiency
A solar collector may be selected from the 32 collector-roof configurations built in to the
program or test results for particular collector-roof systems may be specified. The built in
configurations are selected from two lists, the first list, solar collector type, allows selection
from a range of collector types, the second list allows selection from a range of collector-roof
configurations and more detailed collector construction details.
As the solar collector-roof configuration selection is changed the coefficients in the collector
efficiency equation are shown on the screen. To specify the characteristics of a new solar
collector, test data for the thermal performance must be available in the form
Efficiency = a - (b + c*U)(TBwB - TBaB)/GBnB
where a,b and c are coefficients evaluated from the test data.
U is wind speed (m/s)
GBnB is the incident solar radiation (short wave and long wave) (W/m2)
TBwB & TBaB are the pool water temperature and ambient temperatures (°C)
Incidence angle modifier
Flat plate solar collectors
The incidence angle modifier BB is used to compute reflection from the solar collector surface
BB = 1 d (1/cos( -1)
where d = incidence angle coefficient (to be specified)
= incident angle (computed in the program)
The measurement procedure to determine the performance of an unglazed solar collector is
given in reference 4.
Evacuated tube solar collectors
The incidence angle modifier for evacuated tube solar collector is taken as the product of the
transverse and longitudinal modifiers. Typical modifiers are shown below.
POOLHEAT 5 Swimming Pool Heat Load Analysis 19
Thermal Design Pty Ltd
For a user specified evacuated tube solar collector the transverse and longitudinal incidence
angle modifier test data is entered into POOLHEAT via the following table selected by
clicking on the Incidence Angle Modifier tab .
0.0
0.2
0.4
0.6
0.8
1.0
1.2
1.4
1.6
0 10 20 30 40 50 60 70 80 90
Incidence angle (deg)
Incidence angle modifier
Transverse
Longitudinal
POOLHEAT 5 Swimming Pool Heat Load Analysis 20
Thermal Design Pty Ltd
Heat pump specification
The heat pump specification screen is
The heat pump performance is based on measured performance at a specified test condition
(water temperature and air temperature) and the variation (b) of the COP with the temperature
difference between the air and water temperature.
*( )
wa
COP a b T T 
The test data is entered in POOLHEAT by specifying
water test temperature (typically 25C)
air test temperature (typically 20C)
COP determined from performance measurements at test water and air temperatures
the variation of COP with temperature difference as specified by coefficient “b”.
POOLHEAT 5 Swimming Pool Heat Load Analysis 21
Thermal Design Pty Ltd
During the annual performance analysis POOLHEAT determines COP at water and air
temperatures Tw and Ta as follows
 
* ( ) ( )
test w a w a test
COP COP b T T T T  
where
COP = operational COP at water temperature Tw and air temperature Ta.
COPtest = COP at test conditions (Tw Ta)test
b = variation of COP with temperature difference (typical value = 0.05 C-1)
POOLHEAT 5 Swimming Pool Heat Load Analysis 22
Thermal Design Pty Ltd
Gas heater specification
The gas heater specification screen is
If the gas capacity is not specified (see above) then the program determines the minimum
capacity required to meet the specified operating temperature.
If the gas capacity is specified then the system may not satisfy the specified pool temperature.
POOLHEAT 5 Swimming Pool Heat Load Analysis 23
Thermal Design Pty Ltd
Solar heater specification
The solar heater screen is
Solar collector area
For the default collector efficiencies in PoolHeat the Collector Area is the aperture area of the
collector. For a collector consisting of parallel strips of absorber tubing, mounted on the roof
with spacing between the parallel strips, the aperture area is the area of the strips only. For the
default evacuated tube solar collector the aperture area is the cross sectional area of the tubes
(the outer glass envelope).
If user tested collector efficiency coefficients are entered into PoolHeat then the collector area
is the area used by the test laboratory to calculate collector efficiency; the solar collector
POOLHEAT 5 Swimming Pool Heat Load Analysis 24
Thermal Design Pty Ltd
efficiency coefficients depend on whether gross area, aperture area of absorber area was used
by the test laboratory in determining the efficiency coefficients.
Azimuth angle (180° to -180°) is the horizontal angle from the north/south line to the direction
the solar collector is facing. The azimuth is zero for a collector facing the equator and is
positive for a collector facing towards east.
The % coverage specification for some of the Collector Models refers to the % of the section of
roof covered by the absorber. An unglazed collector absorber receives direct solar input and
heat input from adjacent sections of the base roofing material.
This screen also has a toggle control at the top for switching between solar and heat pump
heating screens for a dual heating system.
POOLHEAT 5 Swimming Pool Heat Load Analysis 25
Thermal Design Pty Ltd
Pool heating season
The operating months of the gas or heat pump heating systems can be specified in the “Pool
heating months” list at the bottom of the gas and heat pump heating system screens.
For the months that the gas or heat pump heating is turned off the solar collector is also
assumed to be turned off.
POOLHEAT 5 Swimming Pool Heat Load Analysis 26
Thermal Design Pty Ltd
The solar plus gas heating specification screen is
This screen has menus at the top for switching between solar and gas heating screens for a dual
heating system.
POOLHEAT 5 Swimming Pool Heat Load Analysis 27
Thermal Design Pty Ltd
Gas and electricity tariffs
The gas or electricity tariff screen contains a series of forms for specifying the electricity
and/or gas tariff times and costs. There are three electric tariff screens corresponding to
different tariff supply options, the screen for extended offpeak operation is shown below. For
some tariffs there are secondary menus for detailed tariff availability times.
The general supply electricity tariff screen is
NOTE: The operating cost is only reported in the Result Summary output for selected “Billing
months” (multiple months operating cost accumulated over billing periods). If you need the
operating cost to be reported for each month then select ALL MONTHS for the “Billing
months”.
POOLHEAT 5 Swimming Pool Heat Load Analysis 28
Thermal Design Pty Ltd
The extended off peak electricity tariff screen is
The time of use electricity tariff screens are
POOLHEAT 5 Swimming Pool Heat Load Analysis 29
Thermal Design Pty Ltd
The gas heating tariff screen is
Billing Months
The months when a utility account is received can be specified at the bottom of the tariff
screens.
POOLHEAT 5 Swimming Pool Heat Load Analysis 30
Thermal Design Pty Ltd
JOB DETAILS
The job screen provides a note pad for entering details of the current job. This input is copied
to the top of the result file.
POOLHEAT 5 Swimming Pool Heat Load Analysis 31
Thermal Design Pty Ltd
RESULTS
The results can be viewed and printed by selecting the Result menu after the analysis is
complete
Tabs are available for
a) heater capacity, energy use and cost
b) pool temperatures (minimum and maximum temperatures are specified as values that
are exceeded for 5% of the operation time)
c) full result list.
A print option is available for the full result list. The result file (result.txt) is also saved in the
user specified directory (File, Save As). If a directory has not been specified then the result
file is saved in the program installation directory.
The result file can be read into an editor or word processor.
POOLHEAT 5 Swimming Pool Heat Load Analysis 32
Thermal Design Pty Ltd
Unheated pool temperature
The result file lists the monthly temperatures of an unheated pool as well as the heated pool.
The temperature analysis for an unheated pool is for an identical pool to the heated system
except the added heating system and pool cover (if used) are removed.
POOLHEAT 5 Swimming Pool Heat Load Analysis 33
Thermal Design Pty Ltd
ANALYSIS OF RESULTS IN EXCEL
In addition to the POOLHEAT result file (file type .RES) there is an output file (file type
.CSV) for transferring the results into EXCEL for graphical display of the output. Two
EXCEL templates for analysing and graphing the output produced by POOLHEAT are
included in the POOLHEAT working directory (EXCEL files POOLHEAT-INDOOR-
POOL.XLS and POOLHEAT-OUTSIDE-POOL.XLS). These are separate from POOLHEAT
and you need to have a copy of EXCEL to use them.
Once you have run a case you can open the EXCEL template (note there is a different template
for outdoor and indoor pools) then read in the POOLHEAT result file name you used (file type
.CSV) or default.csv if you did not save the run under a different file name.
If the progam inputs have been saved (File, Save As) to a user directory before Poolheat is run
then the results will be in the user directory. If the inputs were not saved to a user directory
before running Poolheat then all the results will be in the Poolheat installation directory.
The EXCEL templates include a typical result set. To put your results into these templates
copy the lines of data in your .CSV result file into the DATA worksheet in the EXCEL
template file. (The DATA worksheet tab is on the right hand end of the worksheet tabs).
Note: If you have a result file open in EXCEL (eg RUN1.CSV) and you run POOLHEAT
again using the same file name (RUN1) then the following error message will appear
as the result file has been locked by EXCEL.
To proceed EXCEL must be closed or the data saved under a different file name.
POOLHEAT 5 Swimming Pool Heat Load Analysis 34
Thermal Design Pty Ltd
EXCEL TEMPLATE
The EXCEL template (poolheat-outside-pool.xls) for an outdoor pool is shown below
The charts displayed for an outdoor pool are
Energy flows in a heated pool.
Energy flows in an unheated pool.
Pool temperature.
Range of pool temperature (maximum exceeded for 5% of the time and minimum temperature
exceeded for 95% of the time).
Heater capacity required (specified capacity can also be set in POOLHEAT).
Purchased energy.
The charts displayed for an indoor pool are
Energy flows for indoor pool.
Pool temperature during daytime operating period.
Space temperature during daytime operating period.
Space humidity during daytime operating period.
POOLHEAT 5 Swimming Pool Heat Load Analysis 35
Thermal Design Pty Ltd
Pool temperature at night.
Space temperature at night.
Space humidity at night.
Heater capacity required (specified capacity can also be set in POOLHEAT).
Purchased energy.
The templates display a typical data set when opened. The prepared graphs can be viewed by
selecting the tags along the bottom of the EXCEL window. To view a graphical presentation
of the case you have analysed the data from POOLHEAT must be read in to EXCEL and then
copied into the Data work sheet in the EXCEL template (the right hand tag).
To read the results of a POOLHEAT analysis called RUN1 into EXCEL use the following
procedure:
Open the POOLHEAT result file in EXCEL. The POOLHEAT file name for this example
would be RUN1.CSV (select the Text files type in the EXCEL file-open menu).
This will produce an EXCEL worksheet as follows (partial view of worksheet shown)
All the lines of this file should be selected (drag the mouse pointer down the left hand column
of line numbers in EXCEL or press Ctrl A) and then copied to the clipboard. Paste the data
over the dummy data in the Data worksheet in the appropriate outside or indoor EXCEL
template. The charts in the EXCEL template will then show plots of the results from RUN1.
The EXCEL charts can be edited to suit your application.
Weather Energy Summary Heater Capacity and Cost Outdoor pool temperature
Ta Gh U
Total heat loss -direct gain
Aux collector Solar Capacity Energy Energy Average Average min and max pool temperatures 5% & 95%
input input contrib required use cost noheat with heat unheated heated
Jan 0 0 0.59 2148.32 02884.16 100 0 0 6 24.8 30.91 20.8 28.1 27.3 33.1
Feb 0 0 0.55 2961.79 01783.9 100 0 0 6 25.76 31.17 22.8 28.3 28.8 32.9
Mar 0 0 0.53 6540 06646.61 100 0 0 6 22.38 29.27 19.2 25.4 26 31.6
Apr 0 0 0.51 9394.83 1565.78 8090.68 83.79 144.98 1739.75 525.73 18.88 26.84 16.1 22 23.6 30
May 0 0 0.5 11171.52 5458.16 5000.81 47.81 505.39 6064.63 1704.03 16.37 24.69 14.6 18.7 23.2 27.1
Jun 0 0 0.48 14432.77 11499.56 3017.46 20.79 1064.77 12777.29 3364.21 13.1 23.89 11.4 14.6 22.6 25
Jul 0 0 0.55 16452.29 14390.99 1957.93 11.98 1332.5 15989.98 4319.36 12.33 23.73 10.4 14.3 22.5 24.7
Aug 0 0 0.59 13176.03 9446.78 4082.21 30.17 874.7 10496.42 2871.81 14.68 24.32 12 18.1 22.8 26.4
Sep 0 0 0.63 10454.1 4064.91 6819.91 62.66 376.38 4516.56 1257.72 16.76 25.3 14.8 18.9 23.1 27.9
Oct 0 0 0.65 8270.84 1141.01 6956.37 85.91 105.65 1267.79 399.02 20.24 27.9 16.4 23.9 23.9 30.9
Nov 0 0 0.65 5752.27 06190.12 100 0 0 6 22.64 29.52 19.6 27 26.8 31.9
Dec 0 0 0.65 3407.58 53.36 3030.94 98.27 4.94 59.29 24.38 24.43 30.31 19.6 28.2 25.8 32.9
Annual 0 0 0 3180113 1459107 1720824 54.11 01621230 14490.26 0 0 0 0 0 0
POOLHEAT 5 Swimming Pool Heat Load Analysis 36
Thermal Design Pty Ltd
Summary of steps for loading new data into the EXCEL templates
1) Start Poolheat
2) Setup a user directory
File
Save as (eg save to c:\temp_poolheat\run1)
3) Run Poolheat (results will be saved into the directory c:\temp_poolheat)
4) Open the appropriate example EXCEL template (indoor or outdoor version).
5) Read you results into EXCEL from c:\temp_poolheat\run1.csv
6) Select all the data in your result file (eg CTRL A)
7) Copy all the data (right click copy)
8) Go to the DATA sheet in the EXCEL template and paste your data into the example
EXCEL file.
NOTE before running Poolheat again you need to close the EXCEL file run1.csv. If you do
not close this file EXCEL will stop Poolheat from writing a new csv file.
REFERENCES
1. AS3634, Standards Australia, Solar Heating Systems for Swimming Pools.
2. ISO/TR12596, International Standards Organisation Solar heating - Swimming pool
heating systems - Dimensions, design and installation guidelines.
3. K.I. Guthrie. Testing of Solar Swimming Pool Heaters, Victorian Solar Energy Council
1984.
4. ISO9806-3, International Standards Organisation. Test Methods for solar collectors. Part
3. Thermal performance of unglazed liquid heating collectors.
ResearchGate has not been able to resolve any citations for this publication.
Solar Heating Systems for Swimming Pools
  • Standards Australia
AS3634, Standards Australia, Solar Heating Systems for Swimming Pools.
Testing of Solar Swimming Pool Heaters, Victorian Solar Energy Council
  • K I Guthrie
K.I. Guthrie. Testing of Solar Swimming Pool Heaters, Victorian Solar Energy Council 1984.