Refrigeration Experiment
gerati
Laboratory report
Vapour-Compression Refrigeration Experiment
Thermodynamics
Date of experiment: 26 June 2012
Group D2:
Introduction
The laboratory session for refrigeration system was performed in order to investigate the main concepts of the vapour-compression refrigeration cycle. Simple refrigeration system studied in the laboratory is a prototype for a variety of engineering applications utilized in industrial, domestic and scientific purposes. The detailed goals include the study of how the refrigeration process is affected by the water flow rate through the condenser and evaporator. The optimal flow rate is determined for condenser and evaporator. Finally, the efficiency of the refrigeration system is analyzed.
Theory
Both refrigerators and heat pumps are used to alter the temperature in the specific area. However, the refrigeration systems perform the heat transfer from source with low temperature to sink with higher temperature, while heat pump provides the region with heat. Owing to similarity in general scheme, devices as space cooling are utilized as refrigerator and a heat pump.
The efficiency of refrigerators is evaluated in terms of the Coefficient of Performance (COPR).
COPR= Desired outputRequired input= Cooling effectWorking input= QLWnet,in where QL is a heat removed from the low-temperature region and Wnet,in is a required net work input to the refrigerator.
The vapor-compression cycle is a popular type of refrigeration cycles. It consists of evaporator, compressor, condenser and thermal expansion valve (Figure 1).
Figure1. Schematic representation and T-s diagram for ideal vapor compression cycle (Cengel, 2009).
The behavior of the ideal vapor compression cycle is described by the following processes:
(1-2) Isentropic compression.
(2-3) Isobaric heat rejection.
(3-4) Adiabatic expansion.
(4-1) Isobaric heat absorption (Cengel, Y. 2009). Methodology
Equipment
RA1 Refrigeration Unit was utilized for laboratory
Laboratory report
Vapour-Compression Refrigeration Experiment
Thermodynamics
Date of experiment: 26 June 2012
Group D2:
Introduction
The laboratory session for refrigeration system was performed in order to investigate the main concepts of the vapour-compression refrigeration cycle. Simple refrigeration system studied in the laboratory is a prototype for a variety of engineering applications utilized in industrial, domestic and scientific purposes. The detailed goals include the study of how the refrigeration process is affected by the water flow rate through the condenser and evaporator. The optimal flow rate is determined for condenser and evaporator. Finally, the efficiency of the refrigeration system is analyzed.
Theory
Both refrigerators and heat pumps are used to alter the temperature in the specific area. However, the refrigeration systems perform the heat transfer from source with low temperature to sink with higher temperature, while heat pump provides the region with heat. Owing to similarity in general scheme, devices as space cooling are utilized as refrigerator and a heat pump.
The efficiency of refrigerators is evaluated in terms of the Coefficient of Performance (COPR).
COPR= Desired outputRequired input= Cooling effectWorking input= QLWnet,in where QL is a heat removed from the low-temperature region and Wnet,in is a required net work input to the refrigerator.
The vapor-compression cycle is a popular type of refrigeration cycles. It consists of evaporator, compressor, condenser and thermal expansion valve (Figure 1).
Figure1. Schematic representation and T-s diagram for ideal vapor compression cycle (Cengel, 2009).
The behavior of the ideal vapor compression cycle is described by the following processes:
(1-2) Isentropic compression.
(2-3) Isobaric heat rejection.
(3-4) Adiabatic expansion.
(4-1) Isobaric heat absorption (Cengel, Y. 2009). Methodology
Equipment
RA1 Refrigeration Unit was utilized for laboratory