The use of two expansion valves allows regions of different levels of cooling in a fridge/freezer unit with use of only a single refrigeration cycle. The kitchen is at 25°C, the fridge at 5°C and the freezer at -1°C. The system uses R134a as the working fluid. Question 1. a) Draw the T-s diagram for the multistage diagram shown in figure 1. b) Calculate the required pressure drop in both expansion valves if the temperatures in the hat exchangers need to be 5°C offset from the regional temperature.
The use of two expansion valves allows regions of different levels of cooling in a fridge/freezer unit with use of only a single refrigeration cycle. The kitchen is at 25°C, the fridge at 5°C and the freezer at -1°C. The system uses R134a as the working fluid. Question 1. a) Draw the T-s diagram for the multistage diagram shown in figure 1. b) Calculate the required pressure drop in both expansion valves if the temperatures in the hat exchangers need to be 5°C offset from the regional temperature.
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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Transcribed Image Text:Expansion
valve
QLAR
Kitchen air
QH
Condenser
Refrigerator
(6
A (Alternative path)
Expansion
valve
Freezer
QLF
Compressor
Figure 1:
Image source: Thermodynamics MASK2100 V23, Week 12 - Refrigeration Cycle
The use of two expansion valves allows regions of different levels of cooling in a
fridge/freezer unit with use of only a single refrigeration cycle. The kitchen is at
25°C, the fridge at 5°C and the freezer at -1°C. The system uses R134a as the
working fluid.
Question 1.
a) Draw the T-s diagram for the multistage diagram shown in figure 1.
b) Calculate the required pressure drop in both expansion valves if the
temperatures in the hat exchangers need to be 5°C offset from the regional
temperature.
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