Required information NOTE: This is a multi-part question. Once an answer is submitted, you will be unable to return to this part. Refrigerant-134a enters the condenser of a residential heat pump at 800 kPa and 50°C at a rate of 0.024 kg/s and leaves at 750 kPa subcooled by 3°C. The refrigerant enters the compressor at 200 kPa superheated by 4°C. (Take the required values from saturated refrigerant-134a tables.) QH 750 kPa Condenser Expansion valve Evaporator QL 800 kPa 50°C in Compressor Determine the isentropic efficiency of the compressor. (You must provide an answer before moving on to the next part.) The isentropic efficiency of the compressor is [ %.
Required information NOTE: This is a multi-part question. Once an answer is submitted, you will be unable to return to this part. Refrigerant-134a enters the condenser of a residential heat pump at 800 kPa and 50°C at a rate of 0.024 kg/s and leaves at 750 kPa subcooled by 3°C. The refrigerant enters the compressor at 200 kPa superheated by 4°C. (Take the required values from saturated refrigerant-134a tables.) QH 750 kPa Condenser Expansion valve Evaporator QL 800 kPa 50°C in Compressor Determine the isentropic efficiency of the compressor. (You must provide an answer before moving on to the next part.) The isentropic efficiency of the compressor is [ %.
Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
ChapterMA: Math Assessment
Section: Chapter Questions
Problem 1.1MA
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Question

Transcribed Image Text:## Required Information
**NOTE:** *This is a multi-part question. Once an answer is submitted, you will be unable to return to this part.*
Refrigerant-134a enters the condenser of a residential heat pump at 800 kPa and 50°C at a rate of 0.024 kg/s and leaves at 750 kPa subcooled by 3°C. The refrigerant enters the compressor at 200 kPa superheated by 4°C.
(Take the required values from saturated refrigerant-134a tables.)
### Diagram Explanation
The diagram illustrates the cycle of a refrigerant-134a system in a residential heat pump. The cycle consists of four primary components:
1. **Compressor:** The refrigerant enters the compressor at state (1) with 200 kPa and is superheated by 4°C. The work input (\(W_{in}\)) is required here to elevate the pressure to 800 kPa at state (2).
2. **Condenser:** At state (2), the refrigerant is at 800 kPa and 50°C. In the condenser, heat is rejected (\(\dot{Q}_H\)) as the refrigerant transitions to state (3), where it is at 750 kPa and subcooled by 3°C.
3. **Expansion Valve:** The refrigerant undergoes an isenthalpic process, expanding as it moves to state (4) returning to a lower pressure.
4. **Evaporator:** At state (4), heat is absorbed from the environment (\(\dot{Q}_L\)), which vaporizes the refrigerant back to state (1).
### Task
Determine the isentropic efficiency of the compressor. (You must provide an answer before moving on to the next part.)
The isentropic efficiency of the compressor is ______ %.
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