Ductless systems are commonly used to heat just one area of a home, although they can be installed throughout a home to create temperature zones. Lastly, a geothermal heat pump, also referred to as a ground-source heat pump, uses the warmth stored in the earth (which is roughly 50 to ...
Performance of Cogeneration System Incorporating Gas Engine Driven Heat Pump Cogeneration systems have a large potential for energy saving, especially when they simultaneously produce heat, cold and power as useful energy flows. Var... Y Xie,L Lun,Z Yu,... - Springer Berlin Heidelberg 被引量: ...
The impact of the heat pump doubles by cycling heat energy in a way that is useful to both systems.Similarly, combining industrial heat pumps with thermal storage systems can help stabilize the power grid as renewable energy sources such as wind power increase ...
Using a heat pump system with a boiler, the temperature of flue gas of the boiler can be drooped to dew point and the waste heat in the flue gas and condensation heat can be recovered deeply. In this paper, a new type of system, absorption heat pump vs. boiler, is proposed in ...
However, most of the heat pump systems adopt an expansion valve to complete the cooling and heating modes currently. The flaw is that as the four-way valve is switched, the expansion valve cannot be guaranteed to be very close to the inlet of the evaporator in both modes, making the ...
In moderately cold outdoor temperatures, heat pump systems provide energy-efficient heating using only electricity. In these conditions they can be less costly to operate compared to systems that use more expensive heating fuel sources such as natural gas, oil or propane. As temperatures drop below...
Experimental research has been carried out on water-to-water heat pump driven by natural gas engine under different operating and speed conditions by advanced testing means.The results show that the Primary Energy Ratio(PER)of the system is about 1.13～1.79 under the experimental conditions and the...
A hot gas defrosting method is investigated to solve the frost accumulation on the finned tube evaporator for transcritical CO2 heat pump systems.It is based on the analysis of defrost cycle process,and an air-source transcritical CO2 he... B Hu,F Cao,Z Xing,... - 《Journal of Xian Jiao...
In addition, the revalued thermal energy or ˙QA˙QA from the absorption process can be used in secondary subsystems [39], offering greater versatility in operations and a higher performance system. Figure 1. The modified absorption heat pump (MAHP). The system operates on three pressure ...
From the above-reported literature review it is clear that the in-depth evaluation of the scaling up of thermal systems for energy storage has not been addressed yet. Accordingly, there is a strong need to improve the design process of latent thermal storages, and, particularly, the phase of...