6-55 Refrigerant-134a enters the condenser of a residen- tial heat pump at 800 kPa and 35°C at a rate of 0.018 kg/s and leaves at 800 kPa as a saturated liquid. If the compres- sor consumes 1.2 kW of power, determine (a) the COP of the heat pump and (b) the rate of heat absorption from the outside air.
6-55 Refrigerant-134a enters the condenser of a residen- tial heat pump at 800 kPa and 35°C at a rate of 0.018 kg/s and leaves at 800 kPa as a saturated liquid. If the compres- sor consumes 1.2 kW of power, determine (a) the COP of the heat pump and (b) the rate of heat absorption from the outside air.
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Transcribed Image Text:**The Second Law of Thermodynamics**
**Problem 6-55**
Refrigerant-134a enters the condenser of a residential heat pump at 800 kPa and 35°C at a rate of 0.018 kg/s and leaves at 800 kPa as a saturated liquid. If the compressor consumes 1.2 kW of power, determine (a) the COP of the heat pump and (b) the rate of heat absorption from the outside air.
**Explanation of Diagram (Figure P6-55):**
The diagram illustrates a basic heat pump cycle with the following components:
1. **Condenser:**
- The refrigerant enters the condenser at 800 kPa and leaves at the same pressure as a saturated liquid.
- Heat is rejected from the refrigerant to the surroundings, depicted by \( \dot{Q}_H \).
2. **Compressor:**
- The refrigerant is compressed, and work is done on the refrigerant by the compressor, denoted by \( \dot{W}_{in} \).
3. **Expansion Valve:**
- The expansion valve reduces the pressure of the refrigerant, allowing it to evaporate and absorb heat in the next stage.
4. **Evaporator:**
- The refrigerant absorbs heat from the surroundings, shown by \( \dot{Q}_L \), allowing it to vaporize and complete the cycle.
This system is a typical representation of a thermodynamic cycle used in heat pumps, illustrating the energy exchanges involved in heating and cooling processes.
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