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heat exchanger similar to other approaches (Park and Hrnjak 2004) with the exception of strong consideration given to maintaining the compressor discharge pressure below the CO2 critical point. CO2 cycle sub-cooling and super-heating can be accomplished by an internal heat exchanger and a ground water bypass while the super-heating can be further enhanced by recovering the waste heat of combustion. Fig. 2 shows the heating and cooling mode cycle on a p-h diagram of CO2 based on the design condition in Table 2. Table 2: Operating condition for the FPSHP system design. Component FPSE CO2 cycle Indoor HX Water HX Description Mean pressure (bar) Work output (W) Hot head temperature (°C) Heat rejecter temperature (°C) Heat reject pump power (W) Air blower power for burner (W) Burner capacity (W) Operating frequency (Hz) Discharge temperature (°C) Condenser outlet temperature (°C) Sub-cooling (°C) Evaporator inlet temperature (°C) Suction pressure (bar) Super-heating (°C) Air inlet temperature (°C) Air outlet temperature (°C) Fan power (W) Water inlet temperature (°C) Water outlet temperature (°C) Pump power (W) Heating Cooling 36.7 42.8 1,300 650 630 630 60 60 25 ← same 25 ← same 5,000 ← same 64 66 78 46 27 22 3 7 2 8 36.7 42.8 28 12 20 27 40 17 150 ← same 10 15 5 20 100 ← same Cooling mode cycle Heating mode cycle Figure 2: CO2 p-h diagram for heating and cooling mode assuming a ground water-source heat pump. 2.2 Performance Estimation In compliance with the test standard ISO 13256-1, the input energy for performance calculation includes a ground water circulation pump, a FPSE heat reject water pump, and a burner air blower. The indoor fan power is addressed separately. The test standard considers the indoor fan power together with the delivered energy to the indoor environment, and then it is credited for both delivered and input energy because it increases heating capacity and decreases cooling capacity. However, this study does not consider the indoor fan power. For the FPHSP system performance, the input energy is based on the primary energy, e.g. lower heating value of gas. Therefore, the electric input energy for the pumps and blower was converted to the primary energy assuming 38% electricity generation and transmission 4PDF Image | HERMETIC GAS FIRED RESIDENTIAL HEAT PUMP
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