HVAC system annual energy consumption in Living Part of the building 

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... part model, which represents a room, the area of windows and walls of which is the sum of window and wall area in a residential part of the building. The building envelope characteristics for Living Part are shown in Table 4: *External Wall. Brick-faced concrete external wall 330 mm thick (Concrete 100 mm, mineral wool 115 mm, wind shield board 30 mm, brick, perforated, 85 mm). Window type: 2xClear, 6+6 mm, Aluminium frames, U=2.78 W/m2/°C, according to project design. The model of Swimming pool room is made according to the project (Fig. 5). Fig. 5 The model of Swimming pool room The area of the pool is 32 m2. The water temperature is equal to the room air temperature (on 1-2oC lower), so we didn’t take into account heat losses or gains in this area. Simulation results show, that Living part consumes 33MWh heating energy per year. Cooling electricity, with heat pump COP 2.5 is 4 MWh annually, which is much less than the energy, consumed on heating (Fig. 6). Heating energy consumption in Swimming pool is 77,14 MWh per year. Fig.7 shows, that cooling is not required in this zone, because of high air temperature, maintained all year. During the cooling period, the amount of heat energy, produced by heat pump, is 15.95 MWh per year. We have summarized Swimming pool room heating demand and heat, produced by heat pump. Fig. 8 shows the ratio of these two variables: In both cases, HVAC fan electricity is less or more constant during the year period. Small variations are explained by the number of month days fluctuations. The main advantage of the described system is that it provides heat utilization during the summer period. This method is most applicable for building with swimming pools, or other types of warm water storages. Although, heat pump produced heat within the summer period can be used in hot-water pre-heating in building with decentralized water supply, as well as in special-purpose buildings, for example, factories. The highest precision of data obtained could be achieved, if simulation will include condensation in extract air heat recovery coil. Heat losses caused by water evaporation from swimming pool surface also should give some corrections to the results. However, this factor highly depends on the using intensity of swimming pool [ 8, 10]. The current research focuses on the efficiency of the HVAC system studied. However, further investigations could be dedicated to evaluations of economical aspects in similar systems. The annual energy consumption simulation is made within the average Latvian meteorological year. Two building’s information models (BIM) were created, according to existing site design specifics. Simulation results show, that swimming pool room consumes 77 MWh of heating energy per year, the design value is 85 MWh. When heat pump gained energy is used to preheat swimming pool supply air, annual heat energy consumption decreases to 62 MWh, which means about 20% saving. The paper results can be useful for architects and HVAC system designers in other multipurpose buildings with indoor swimming pools design as an another opportunity to increase the energy efficiency of building heating, ventilation and air-conditioning ...