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.

icon
Related questions
Question
**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.
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.
Expert Solution
steps

Step by step

Solved in 4 steps

Blurred answer
Similar questions