Theoretical models were established to analyze the energetic, exergetic, economic, and environmental (4E) performance of the proposed system in comparison with a conventional dual-heat source/sink air source heat pump (CDHP) system. The effects of different parameters on the performances of the ...
If the electricity consumption of the pump (Pel,pump) of the ECC is accounted for (assuming a pump motor efficiency equal to ηM), the total COP (COPt) of the ECC is: (4)COPECC,t=Q˙eQ˙g+Pel,pump=m˙e(h4-h3)m˙g(h2-h1)+m˙g(h1-h6)ηM=ωh4-h3h2-h1+h1-h6ηM The ...
Never install the pump in a trench, ditch or hole with a dirt bottom; the legs will sink into the dirt and the suction will become plugged. Figure 2 shows a typical installation of an "A" version float, (an "AU" version will attach to the pump), using a piggy-back plug. 6 ...
serves as the energy input required for the compression operation. To obtain a cooling effect, part of the refrigerant condensate in the condenser is allowed to expand in evaporator to absorb heat from environment. The rest is recirculated by aliquid circulationpump to generator to complete the ...
Jet pumpThermodynamic simulationRefrigerantsGWPThe Constant Rate of Momentum Change (CRMC) criterion attempts to improve the design of supersonic ejectors, that can be used in heat-powered chillers for industrial or air-conditioning use. Moving from its original formulation, the CRMC design method can...
The temperature of the heat source was 26掳C, and that of the heat sink was 5掳C. For 20 kW power generation, the performances of each system, such as the flow rate and efficiency, were compared and studied.J.H. MoonH.S. Lee
for structure and control co-optimization of a transcritical CO2 ejector expansion heat pump combined with hot and cold thermal energy storages (EHPTES), which is an extension of our previous work on charging of hot and cold storages using a dual-mode CO2 heat pump [4], [7], [8], [...
Ejector is a device that uses a high-pressure fluid to pump a low-pressure fluid to a higher pressure at a diffuser outlet. Its low cost, no moving parts and ability to handle two-phase flow without damage make it attractive for being the expansion device in the refrigeration system. The...
A high-efficiency heat source/sink system is important for saving energy [4]. In most areas of the world, heating is necessary in winter, and cooling is necessary in summer [5]. Conventional heat source/sink systems, such as the air source heat pump system, usually provide a single heat...
For example, electronic components such as an IC chip and a resistor, and a heat dissipation fin (a heat sink) are listed as the heaters, however, any material other than the above listed ones serves as a heater as long as it generates heat, and this also applies to the following ...