Vapour-compression Refrigeration - Lab Report
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Added on 2020-05-28
Vapour-compression Refrigeration - Lab Report
Added on 2020-05-28
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LAB REPORTName of StudentInstitution Affiliation1
IntroductionThe experiment which was carried out aimed studying the Vapour-compression refrigeration. Both Hilton Refrigeration and the refrigerant R134a were used in during thesession. Refrigeration refers to the process of taking heat from a reservoir with low temperatures then dumped to another reservoir with high temperatures to ensure that a cold space is always available in the system.There are four processes which make up the refrigeration cycle[ CITATION Qiy14 \l 2057 ]. The first process involves the saturated vapour of the refrigerant. The second process includes the saturated steam leaving evaporator and entering the compressor.in the third process the steam which is super-heated is allowed to enter into the condenser[ CITATION Proon \l 2057 ]. Heat is rejected by the vapour which is super-heated and thus condensing at a constant pressure. Once the super-heated steam has condensed, it leaves the condenser as a saturated liquid. The liquid then is pushed to enter into the expansion valve, and in that way, it expands to enable the pressure to return to the evaporator pressure. In that way, the refrigerant passes through the evaporator, and the process continues as a cycle[ CITATION Roz12 \l 2057 ].2
By Appling the first law of thermodynamics in the systems which are open.Q+W=ṁ((h2−h1)+12(c22−c12)+g(z2−z1))ObjectivesThe objectives of the experiment which was carried out were: to identify the phase and state of refrigerant as it goes through the processes of the evaporator, compressor, throttle valve and the condenser. To find out the energy which is transferred to all the systems which are mentioned above. To calculate the coefficient of performance of the refrigeration[ CITATION Maj10 \l 2057 ].Experiment Set-UpThe investigations of the coefficient of performance variation were carried out by the use of the Hilton Refrigeration. The changes were to be observed depending on the shaft, electrical and the power indications. The refrigerant R134a was allowed to flow into the compressor which was from the evaporator which was located at the top of the rig. The refrigerator is then allowed to condense in the condenser which is around the condenser; there are many coils of cooling water[ CITATION Maj10 \l 2057 ]. The vapour from the refrigerant rejects all the heat making it condense at the condenser coil. This process of vaporising and condensing continues in a cycle[ CITATION Chr15 \l 2057 ].3
MethodThroughout the experiment session pressure in the condenser was kept constant at 950KNm-2. This was aimed at applying a steady flow of other conditions. The load in the evaporator was varied between 400W to 800W by the use of the input control of the evaporator[ CITATION Eri11 \l 2057 ]. The pressure of the condenser would change according to the changes which were made in the evaporator load. The rate of water flow and the spring balance was in most cases replaced simultaneously to keep the pressure on the condenser at 950KNm-2.The water flow transducer was used to adjust the rate at which water was flowing. It was a must that the spring balance had to line with the arrow(6).The readings of the water flow and the refrigerant were read from the flowmeters which were at Rig and the also the reading on the spring balance was also taken. The evaporator pressure was read from the evaporator pressure dial[ CITATION Rur12 \l 2057 ]. All the measurements of temperature ware also keenly recorded which six in total were. There were variations which were done to the selector switch such that it changed from 1 to 6 and the temperature readings were recorded. The last measurement which was to be recorded was to be taken from the motor input[ CITATION Mah16 \l 2057 ]. 4
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