1 0 obj The evaporating liquid absorbs heat from the surroundings, thus performing the cooling or refrigeration duty for the surrounding air, water or other medium. The actual vapour compression cycle is different from the theoretical vapour compression cycle in many ways. Expansion from 4-1 results in a very wet refrigerant, causing erosion of turbine blades. Refrigeration Cycles 6.5 Simple Vapor Compression Refrigeration System This course is an overview of vapor- The equipment used for removing the heat continuously for maintaining a low temperature in a space is called ‘refrigerator’. The vapor-compression uses a circulating liquid refrigerant as the medium (usually R134a) which absorbs and removes heat from the space to be cooled and subsequently rejects that heat elsewhere.The figure depicts a typical, single-stage vapor-compression system.The typical vapor-compression system consist of four components: hޔX]�۶}ׯ�#Գ�w���N��49�u��l�$ч"�Zg�}� �\���{���`�Ν;���-�������ng���F�i"�4V�؝7�8����_�6RlwiM��D�,�2���I�����y;f����S1����g.��H�ʃ�J���"J",�O��?��e�����w�$�#��U�&��R�_@�R��,o/���w�ԨTdZ�xIk\���"-�9�+PM��b���M��2��K��a The main deviations between the theoretical and actual cycle are: (1) Vapour refrigerant leaving the evaporator is in superheated state. In this system, the working fluid is a vapor. The actual vapour compression cycle is different from the theoretical vapour compression cycle in many ways. 13-19 Lesson 4 Theoretical and actual cycle, performance of refrigeration cycle… endobj Key components in the refrigeration system are a compressor, a condenser, an evaporator and an expansion valve. endstream endobj 172 0 obj <>stream Actual vapour compression cycle Fig. %PDF-1.5 The points which are required for engineering calculation are from H 1 to H 6 as shown in the Figure 1-6. �I�|�i�i��W!��桿ͦ���. The vapor compression cycle circulates a fluid through a compressor, condenser, expansion valve, and evaporator, in order to absorb heat from a refrigerated space at a low temperature and give off heat at a higher temperature to the surroundings, thus keeping the refrigerated space cool. Refrigeration has been accomplished in a variety of ways over the course of history, but vapor-compression refrigeration systems (VCRS) have become the preferred option thanks to their efficiency and reliability. H 1 to H 2 is the adiabatic compression of the compressor for the simple refrigeration system The above figure shows the objectives of refrigerators and heat pumps. performed by vapour compression refrigeration systems, but the refrigerants in vapour compression refrigeration systems are mainly HCFCs and HFCs, which are not environmentally friendly, and the compressor uses a significant portion of the engine power. ��W� 4�$ Comparing figs. 19. A refrigerant design problem for a vapor-compression (refrigeration) cycle was presented previously (Gani et al., 2017; Kalakul et al., 2016). Vapor compression is the most common refrigeration process and is widely used for applications such as air conditioning and domestic or industrial refrigeration. Actual vapour compression cycle Fig. T2 – THE VAPOUR COMPRESSION REFRIGERATION CYCLE OBJECTIVE The objective of this laboratory is to investigate the vapour compression refrigeration cycle through a detailed analysis of the P.A. The resulting refrigerant vapor returns to the compressor inlet at point 1 to complete the thermodynamic cycle. A heat pump uses a vapour compression cycle with refrigerant 12. The actual vapour compression cycle differs from the standard cycle due to the following reasons: liquid refrigerant in the condenser is subcooled to ensure 100% liquid entering the expansion valve. The vapor usually leaves the evaporator is superheated to prevent droplet of liquid within the compressor. 2 0 obj 13 Type of Refrigeration Type of Refrigeration Vapour Compression Refrigeration Refrigeration cycle Liquid passes through expansion device, which reduces its pressure and controls the flow into the evaporator Condenser Evaporator High Pressure Side Low Pressure Side Compressor … 1. Ideal vapour compression refrigeration cycle The impracticalities of the reversed Carnot Cycle can be eliminated by: vaporising the refrigerant completely before it is compressed T-S diagram for actual Vapour Compression cycle. The vaporized refrigerant goes back to the compressor to restart the cycle. Practical Difficulties of Carnot cycle. Actual Vapour Compression Cycle. The refrigerant enters the compressor at -100C, 1.4 bar, and exits at 7 bar. A comparative study has been carried out of R-12, 22, 125, 134a, 152a, 218, 245, 500, 502, 507 and 717 as working fluids in a vapour-compression refrigeration system. 5-4: T-s diagram for actual vapor-compression cycle. Experiment 2: Vapor Compression Refrigeration Cycle Objective Determining the coefficient of performance of a vapour compression refrigeration cycle. It is used for all industrial purposes from a small domestic refrigerator to a big air conditioning plant.

vapour compression refrigeration cycle pdf

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