Michael Evans's research while affiliated with University of South Australia and other places

Publications (8)

Article
Latent heat thermal energy storage systems can regulate the intermittency of electricity generation in a grid powered by renewable energy sources. Such systems could be used in conjunction with Brayton power generation cycles operating at high temperatures (520 °C–750 °C) delivering higher efficiency. However, a trade-off of higher thermal efficien...
Article
In the context of the Montreal Protocol, CO2 is considered as an appropriate natural refrigerant with an Ozone Depletion Potential (ODP) of zero and a Global Warming Potential (GWP) of one. A CO2 heat pump water heater (HPWH) can provide hot water with a relatively high COP and consume significantly less energy than all electric or gas water heater...
Article
Supercritical CO2 has been proposed as a heat transfer fluid for Brayton cycles to achieve a high effectiveness in power generation from concentrated solar power plants. A printed circuit heat exchanger (PCHE) has been considered as an alternative design for a sodium to supercritical CO2 heat exchanger operating at high pressure and temperature (22...
Article
The study reveals the effect of interstage pressure with the consideration of gas cooler outlet temperature on the cooling performance of an operating CO 2 heat pump system currently in use at a dairy plant. Based on the numerical model and CO 2 properties, it was found that the maximum mass fraction of liquid allocated for cooling can be achieved...
Article
The configuration of a recently installed CO2 heat pump system with a cooling capacity of 33.5 kW and heating capacity of 35.8 kW used on a dairy farm is presented. This system has been studied in order to determine the optimal performance when used for combined water heating and refrigeration. Furthermore, the effect of the interstage pressure on...
Article
Carbon dioxide (CO2) is a natural substance and an environmentally benign, safe and economical refrigerant that can be used for cooling and heating systems. Unlike a traditional reversible heat pump system that only works either in heating or cooling, the air-to-air transcritical CO2 heat pump system reported in this paper is capable of providing s...
Article
The structural integrity of a lab-scale shell and tube latent heat thermal energy storage under transient conditions was investigated. The system was designed to use sodium at 750 °C as a heat transfer fluid with a high temperature phase change material, melting at 705.8 °C, as the heat storage medium. Stainless steel 347H (SS347H) was used as the...
Technical Report
Report is accessible on https://www.racefor2030.com.au/publications/ This report has been prepared by the authors at the request of the Reliable Affordable Clean Energy for 2030 Cooperative Research Centre (RACE for 2030 CRC). In Australia, industry consumes nearly half of the total end use energy, out of which, 37% is used in process heat, repres...

Citations

... This paper's energy data analysis did not include energy for water heating, but water heating is a key factor of hospital energy use. Current Australian hospitals mostly use natural gas as the primary energy source to produce hot water or steam [47]. However, there are no data available for hot water use in this case study. ...
... 23 Storage systems using PCMs can be smaller than single-phase sensible heating systems since the enthalpies of fusion or vaporization of solids or liquids are much greater than sensible heats. 24 The precise heat, as well as the phase change enthalpy, governs the amount of energy stored, which can be computed using Equation (2) given below: ...
... Simulations run with Modelica showed that an ejector and a floating receiver would even increase the COP h&c up to 3.72. Wang et al. also measured the COP of a CO 2 transcritical heat pump for simultaneous space heating and cooling at a value of 3.27 [102]. An optimization phase still remains to be conducted in order to correct the slow operation of a three-way valve. ...