Refrigerators to preserve perishable foods have long been one of the essential appliances in a household. The refrigeration system of the household refrigerator is basically based on the vapor-compression refrigeration cycle, as shown in Figure Q2.1. Among the important components of the vapor-compressions refrigeration cycle are a throttling valve (A) and a compressor (B). In this refrigeration system, tetrafluoroethane (R-134a) is used as the refrigerant. Condenser Evaporator Figure Q2.1: Basic components of a refrigeration system. (a) If the refrigerant enters A as a saturated liquid at 1100 kPa and leaves at 120 kPa, (i) Estimate the quality of the refrigerant at the exit of A. (ii) Calculate the temperature drop during the process. (iii)With appropriate assumptions, prove that the conservation of energy for A as follows the equation below, h2 (b) If the refrigerant enters B as a saturated vapor at 120 kPa with flow rate of 1.5 m³/min and leaves at 1100 kPa, (i) Calculate the mass flow rate of the refrigerant. (ii) Suggest the maximum power input to be supplied during the compression process if the refrigerant exits from B at 60 °C.

Refrigerators to preserve perishable foods have long been one of the essential appliances in a household. The refrigeration system of the household refrigerator is basically based on the vapor-compression refrigeration cycle, as shown in Figure Q2.1. Among the important components of the vapor-compressions refrigeration cycle are a throttling valve (A) and a compressor (B). In this refrigeration system, tetrafluoroethane (R-134a) is used as the refrigerant. Condenser Evaporator Figure Q2.1: Basic components of a refrigeration system. (a) If the refrigerant enters A as a saturated liquid at 1100 kPa and leaves at 120 kPa, (i) Estimate the quality of the refrigerant at the exit of A. (ii) Calculate the temperature drop during the process. (iii)With appropriate assumptions, prove that the conservation of energy for A as follows the equation below, h2 (b) If the refrigerant enters B as a saturated vapor at 120 kPa with flow rate of 1.5 m³/min and leaves at 1100 kPa, (i) Calculate the mass flow rate of the refrigerant. (ii) Suggest the maximum power input to be supplied during the compression process if the refrigerant exits from B at 60 °C.

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

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Concept explainers

Basic Thermodynamic Processes

The word 'thermodynamics' can be divided into two words, 'thermo' and 'dynamics'. The word thermo deals with the heat and thermal phenomenon, whereas dynamics deals with forces or external agent that drives the heat flow or aids in the motion of heat.

Question

Refrigerators to preserve perishable foods have long been one of the essential appliances
in a household. The refrigeration system of the household refrigerator is basically based
on the vapor-compression refrigeration cycle, as shown in Figure Q2.1. Among the
important components of the vapor-compressions refrigeration cycle are a throttling valve
(A) and a compressor (B). In this refrigeration system, tetrafluoroethane (R-134a) is used
as the refrigerant.
Condenser
W
B
A
Evaporator
Figure Q2.1: Basic components of a refrigeration system.
(a) If the refrigerant enters A as a saturated liquid at 1100 kPa and leaves at 120 kPa,
(i) Estimate the quality of the refrigerant at the exit of A.
(ii) Calculate the temperature drop during the process.
(iii)With appropriate assumptions, prove that the conservation of energy for A as
follows the equation below,
h= h2
(b) If the refrigerant enters B as a saturated vapor at 120 kPa with flow rate of 1.5 m³/min
and leaves at 1100 kPa,
(i) Calculate the mass flow rate of the refrigerant.
(ii) Suggest the maximum power input to be supplied during the compression
process if the refrigerant exits from B at 60 °C.

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