THE VAPOUR COMPRESSION REFRIGERATION CYCLE. Engineering Lab Report (Lab Report Sample)

The Vapor Compression Refrigeration Cycle
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Abstract
The primary purpose of carrying out the refrigeration cycle experiment is to study the vapor refrigeration cycle by analyzing the Hilton R714’s system. The aim of the research is to be achieved by the determining of the system’s coefficient of performance (COP). Coefficient of performance of a system is a very crucial measure in evaluating the system’s usefulness, and it quantifies the maximum possible output unit of the system. Refrigerant 134a undergo isobaric heat addition, constant compression, isentropic compression as well as constant heat rejection. The COP obtained by experimental method was 1.5 while the COP obtained through the use of the P-h graph was 1
Objectives
The laboratory experiment is aimed at investigating the vapor compression cycle by analyzing the Hilton R714’s refrigeration system.
Introduction
The working principle of a refrigeration system is based on the cycling law of the thermodynamics that is subjected to different temperature sources. During the operation of the system, the refrigerant undergoes different changes of states sequentially before returning to the original state. The principle of operation of a refrigerator is based on heat removal from a low-temperature region. Since the heat transferred from the substance placed in the unit plus the energy required to run the group cannot be destroyed according to the law of conservation of energy, the heat is released to the surrounding at a higher temperature. By so doing the unit operates as a heat pump. Therefore, heat pump, as well as the refrigeration cycle, are similar. However, heat emitted by a heat pump is utilized while heat absorbed in a refrigeration process is useful. Generally, the system can be compared to a heat engine that works in a reversed cycle, technically referred to a Carnot modified sequence. The heat in operation takes place from a cold reservoir to a hot reservoir; hence the Second Law of Thermodynamics.
The four main components for operation of a refrigeration cycle include the expansion valve, evaporator, condenser, and compressor. Under ideal vapor-compression, the refrigerant is subjected to the compressor as saturated vapor input before cooling takes place in the condenser unit. Its pressure reduces at the throttle valve and vaporizes after absorbing heat from the refrigerated space.
Hilton refrigeration laboratory unit is a vapor compression unit that enables the study of the vapor compression cycle.
Theory
For the thermal evaluation of the vapor cycle, T-s and p-h diagram are employed in the analysis. Fig 1 shows the sequence which includes the following processes
1-2 compression (isentropic)
2-3 condenser’s constant heat rejection
3-4 expansion valve throttle
4-1 evaporator’s constant heat addition