5. The typical analysis of the thermodynamics system in a refrigerator is focused on a working fluid called \( \qquad \) 6. The part of the refrigeration cooling cycle that converts liquid with low pressure into high pressure and with low temperature into high temperature is \( \qquad \) 7. The part of the refrigeration cooling cycle that allows the collected heat to be discharged to the surroundings is called \( \qquad \) 8. The part of the refrigeration cooling cycle that allows absorbing the heat from the room is called \( \qquad \) 9. The part of the refrigeration cooling cycle that converts liquid with high pressure into low pressure and with high temperature into low temperature is \( \qquad \) 10. The refrigerator's purpose is also to keep a cool place cool by exhausting \( \qquad \) in the kitchen.
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A refrigerator operates on the ideal vapor-compression refrigeration cycle with refrigerant-134a as the working fluid. The refrigerant evaporates at $-10^{\circ} \mathrm{C}$ and condenses at $57.9^{\circ} \mathrm{C}$ The refrigerant absorbs heat from a space at $5^{\circ} \mathrm{C}$ and rejects heat to ambient air at $25^{\circ} \mathrm{C}$. Determine $(a)$ the cooling load, in $\mathrm{kJ} / \mathrm{kg}$ and the COP, ( $b$ ) the exergy destruction in each component of the cycle and the total exergy destruction in the cycle, and ( $c$ ) the second-law efficiency of the compressor, evaporator, and the cycle.
An actual refrigerator operates on the vaporcompression refrigeration cycle with refrigerant-22 as the working fluid. The refrigerant evaporates at $-15^{\circ} \mathrm{C}$ and condenses at $40^{\circ} \mathrm{C}$. The isentropic efficiency of the compressor is 83 percent. The refrigerant is superheated by $5^{\circ} \mathrm{C}$ at the compressor inlet and subcooled by $5^{\circ} \mathrm{C}$ at the exit of the condenser. Determine (a) the heat removed from the cooled space and the work input, in $\mathrm{kJ} / \mathrm{kg}$ and the COP of the cycle. Determine ( $b$ ) the same parameters if the cycle operated on the ideal vapor-compression refrigeration cycle between the same evaporating and condensing temperatures. The properties of $R-22$ in the case of actual operation are: $h_{1}=402.49 \mathrm{kJ} / \mathrm{kg}, h_{2}=454.00 \mathrm{kJ} / \mathrm{kg}, h_{3}=243.19 \mathrm{kJ} / \mathrm{kg}$ The properties of $R-22$ in the case of ideal operation are: $h_{1}=399.04 \mathrm{kJ} / \mathrm{kg}, h_{2}=440.71 \mathrm{kJ} / \mathrm{kg}, h_{3}=249.80 \mathrm{kJ} / \mathrm{kg}$ Note: state 1: compressor inlet, state 2: compressor exit, state 3: condenser exit, state 4: evaporator inlet.
20.48. Thermodynamic Processes for a Refrigerator. A refrigcrator operates on the cycle shown in Fig. 20.28. The compression $(d \rightarrow a)$ and expansion $(b \rightarrow c)$ steps are adiabatic. The temperature, pressure, and volume of the coolant in each of the four states $a, b, c,$ and $d$ are given in the table. (a) In each cycle, how much heat is taken from inside the refrigerator into the coolant while the coolant is in the evaporator? (b) In each cycle, how much heat is exhansted from the coolant into the air outside the refrigerator while the coolant is in the condenser? (c) In each cycle, how much work is done by the motor that operates the compressor? (d) Calculate the coefficient of performance of the refrigerator.
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