A refrigeration unit utilises ammonia as the refrigerant. The diagram for the circuit is shown in Figure Q3 below, with the following conditions: point (1) is a saturated liquid at –30 oC, points (3), (4) and (7) is a saturated liquid at 10 oC and point (5) is a saturated vapour at –30 oC. The isentropic efficiency of the compressor and pump is 80% and it is assumed there are negligible heat losses to the surroundings. The liquid ammonia has a specific volume of 0.0015 m3 kg-1. (a) Discuss which factors must be considered when selecting an appropriate refrigerant? (b) Calculate the coefficient of performance (COP) of the cycle. (c) If the effect of refrigeration is 10 kW, determine the required mass flow rate.
A refrigeration unit utilises ammonia as the refrigerant. The diagram for the circuit is shown in Figure Q3 below, with the following conditions: point (1) is a saturated liquid at –30 oC, points (3), (4) and (7) is a saturated liquid at 10 oC and point (5) is a saturated vapour at –30 oC. The isentropic efficiency of the compressor and pump is 80% and it is assumed there are negligible heat losses to the surroundings. The liquid ammonia has a specific volume of 0.0015 m3 kg-1. (a) Discuss which factors must be considered when selecting an appropriate refrigerant? (b) Calculate the coefficient of performance (COP) of the cycle. (c) If the effect of refrigeration is 10 kW, determine the required mass flow rate.
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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A refrigeration unit utilises ammonia as the refrigerant. The diagram for the circuit is
shown in Figure Q3 below, with the following conditions: point (1) is a saturated liquid
at –30 oC, points (3), (4) and (7) is a saturated liquid at 10 oC and point (5) is a saturated
vapour at –30 oC. The isentropic efficiency of the compressor and pump is 80% and it
is assumed there are negligible heat losses to the surroundings. The liquid ammonia
has a specific volume of 0.0015 m3 kg-1.
(a) Discuss which factors must be considered when selecting an appropriate refrigerant?
(b) Calculate the coefficient of performance (COP) of the cycle.
(c) If the effect of refrigeration is 10 kW, determine the required mass flow rate.
Transcribed Image Text:6
Compressor
Condenser
5
7
y
Flash
chamber
1
4
3
Spray
1
Evaporator
2
Pump
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