A gas refrigeration system using air as the working fluid has a pressure ratio of 5 (see Fig. Q 1). Air enters the compressor at 0°C. The high-pressure air is cooled to 35°C by rejecting heat to the sur- roundings. The refrigerant leaves the turbine at –80°C and enters the refrigerated space where it absorbs heat before entering the regenerator. The mass flow rate of air is 0.4 kg/s . Assuming isen- tropic efficiencies of 0.8 for the compressor and 0.85 for the turbine and variable specific heats. Draw accurately the cycle on a T-s diagram with properly labelled property values. Determine (a) the effectiveness of the regenerator, (b) the rate of heat removal from the refrigerated space, and (c) the COP of the cycle. Also, determine (d) the refrigeration load and the COP if this system operated on the simple gas refrigeration cycle. Use the same compressor inlet temperature as given, the same turbine inlet temperature as calcu- lated, and the same compressor and turbine « also. iciencies. Draw the T-s diagram for this simple case

A gas refrigeration system using air as the working fluid has a pressure ratio of 5 (see Fig. Q 1). Air enters the compressor at 0°C. The high-pressure air is cooled to 35°C by rejecting heat to the sur- roundings. The refrigerant leaves the turbine at –80°C and enters the refrigerated space where it absorbs heat before entering the regenerator. The mass flow rate of air is 0.4 kg/s . Assuming isen- tropic efficiencies of 0.8 for the compressor and 0.85 for the turbine and variable specific heats. Draw accurately the cycle on a T-s diagram with properly labelled property values. Determine (a) the effectiveness of the regenerator, (b) the rate of heat removal from the refrigerated space, and (c) the COP of the cycle. Also, determine (d) the refrigeration load and the COP if this system operated on the simple gas refrigeration cycle. Use the same compressor inlet temperature as given, the same turbine inlet temperature as calcu- lated, and the same compressor and turbine « also. iciencies. Draw the T-s diagram for this simple case

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

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Question

A gas refrigeration system using air as the working fluid has a pressure ratio of 5 (see Fig. Q 1). Air
enters the compressor at 0°C. The high-pressure air is cooled to 35°Cby rejecting heat to the sur-
roundings. The refrigerant leaves the turbine at –80°C and enters the refrigerated space where it
absorbs heat before entering the regenerator. The mass flow rate of air is 0.4 kg's . Assuming isen-
tropic efficiencies of 0.8 for the compressor and 0.85 for the turbine and variable specific heats.
Draw accurately the cycle on a T-s diagram with properly labelled property values. Determine
(a) the effectiveness of the regenerator,
(b) the rate of heat removal from the refrigerated space, and
(c) the COP of the cycle. Also, determine
(d) the refrigeration load and the COP if this system operated on the simple gas refrigeration cycle.
Use the same compressor inlet temperature as given, the same turbine inlet temperature as calcu-
lated, and the same compressor and turbine efficiencies. Draw the T-s diagram for this simple case
also.
Heat
Exchanger
Нeat
(COLD refrigerated
Exchanger.
WARM
space
environment
Compressor
Turbine
Fig. Q 1
Activate Windov
Go to Settings to acti

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Step 1: Given data

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Step 2: Calculating All Temperature Value

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Step 3: (a) Calculating The Effectiveness of the Regenerator

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Step 4: (b) Calculating the Rate of Heat Removal from the Refrigerated space

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Step 5: (c) Calculating the Cop of the Cycle.

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A heat pump with refrigerant-134a (R-134a) as the working fluid is used to keep a space at 21 °C by absorbing heat from geothermal water that enters the evaporator at Ti,water = 60 °C at a rate of 0.067 kg/s and leaves at To,water = 40 °C. The specific heat of liquid water is 4.18 kJ/(kg∙K). Refrigerant enters the evaporator at TR-134a = 10 °C with a quality of x = 12 % and leaves at the same pressure as saturated R-134a vapor at the same temperature. The compressor consumes 1.4 kW of power. 1)Determine the mass flow rate (in kg/s) of the refrigerant. 2)Determine the rate of heat (in kW) supplied to the space. 2)Determine the COP of the heat pump. 4)Determine the ideal minimum power input (in kW) to the compressor for the same rate of heat supply
The evaporator and condenser is isobaric with a net heat transfer 250 W in a vapor-compression refrigeration cycle. The cycle operates with R-134a working fluid at a steady state. The compressor's isentropic efficiency is at 60% with a high pressure of 16 bar and low pressure of 1 bar during the cycle. Solve for the mass flow rate, coefficient of performance, and draw the T-s diagram.
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A two-evaporatoor compression refrigeration system like that in the Figure below uses refrigerant-134a as the working fluid. The system operates evaporator 1 at 30 psia, evaporator 2 at 10 psia, and the condeser at 180 psia. The cooling load for evaporator 1 is 9000 Btu/h and that for evaporator 2 is 24,000 Btu/h. Determine the power required to operate the compressor and the COP of this system. The regrigerant is saturated liquid at the exit of the condenser and saturated vapor at the exit of each evaporator, and the compressor is isentropic.
8.
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