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Figure 3 shows a refrigeration system using Refrigerant-134a as the refrigerant has a compressor that consumes 800 W of power when operational. The refrigerant enters the evaporator at 100 kPa as saturated mixture of quality 25% and leaves the condenser the same pressure as at a temperature of -26°C. Determine the rate of heat rejected (QH) at the condenser and the COP of the refrigerator. The mass flow rate of the refrigerant is 0.005 kg/s. condenser expansion valve compressor evaporator Figure 3: Refrigeration system

Figure 3 shows a refrigeration system using Refrigerant-134a as the refrigerant has a compressor that consumes 800 W of power when operational. The refrigerant enters the evaporator at 100 kPa as saturated mixture of quality 25% and leaves the condenser the same pressure as at a temperature of -26°C. Determine the rate of heat rejected (QH) at the condenser and the COP of the refrigerator. The mass flow rate of the refrigerant is 0.005 kg/s. condenser expansion valve compressor evaporator Figure 3: Refrigeration system

Elements Of Electromagnetics
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) Figure 3 shows a refrigeration system using Refrigerant-134a as the refrigerant has a compressor that consumes 800 W of power when operational. The refrigerant enters the evaporator at 100 kPa as saturated mixture of quality 25% and leaves the condenser the same pressure as at a temperature of -26°C. Determine the rate of heat rejected (Q.) at the condenser and the COP of the refrigerator. The mass flow rate of the refrigerant is 0.005 kg/s. condenser expansion compressor valve evaporator Figure 3: Refrigeration system (b) After graduation, you decided to work overseas to experience living in a country with four seasons. Your neighbour, knowing that you are an engineer asked your help to install a heat pump system for his house. He wanted to always maintain the temperature in his house at 24°C during winter. In that area during winters, average outside temperature is -3°C. He also has an underground water well with average water temperature of 10°C during winter. You estimated that the heat losses from the house under the average outside temperature to be 75000 kJ/h. Investigate the most economical mean to power the heat pump (by calculating the minimum power required) if you can choose to extract heat from either: i. The outside air at average temperature of -3°C ii. The well water at 10°c State the reasoning for your calculations.
Transcribed Image Text:(a) Figure 3 shows a refrigeration system using Refrigerant-134a as the refrigerant has a compressor that consumes 800 W of power when operational. The refrigerant enters the evaporator at 100 kPa as saturated mixture of quality 25% and leaves the condenser the same pressure as at a temperature of -26°C. Determine the rate of heat rejected (Q.) at the condenser and the COP of the refrigerator. The mass flow rate of the refrigerant is 0.005 kg/s. condenser expansion compressor valve evaporator Figure 3: Refrigeration system (b) After graduation, you decided to work overseas to experience living in a country with four seasons. Your neighbour, knowing that you are an engineer asked your help to install a heat pump system for his house. He wanted to always maintain the temperature in his house at 24°C during winter. In that area during winters, average outside temperature is -3°C. He also has an underground water well with average water temperature of 10°C during winter. You estimated that the heat losses from the house under the average outside temperature to be 75000 kJ/h. Investigate the most economical mean to power the heat pump (by calculating the minimum power required) if you can choose to extract heat from either: i. The outside air at average temperature of -3°C ii. The well water at 10°c State the reasoning for your calculations.
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