refrigerator trial - REFRIGERATOR TRIAL CONTENT OBJECTIVE 3 INTRODUCTION 3 THEORY 4 OBSERVED RESULT 5 CALCULATED RESULT 5 SAMPLE CALCULATION 6 GRAPHS 8

refrigerator trial - REFRIGERATOR TRIAL CONTENT OBJECTIVE 3...

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REFRIGERATOR TRIAL
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CONTENT OBJECTIVE 3 INTRODUCTION 3 THEORY 4 OBSERVED RESULT 5 CALCULATED RESULT 5 SAMPLE CALCULATION 6 GRAPHS 8 DISCUSSION 11 CONCLUSION 12 REFERENCE 12 Table of figures FIGURE 1: Simple Vapour Compression Refrigeration System 3 FIGURE 2: Theoretical Vapour Compression Cycle 4 FIGURE 3: Experimental Details 5 FIGURE 4: Calculated Results 6 FIGURE 5: P h Diagram (Test 1) 9 FIGURE 6: P h diagram (Test 2) 9 FIGURE 7: Graph Showing Volumetric Efficiency against Pressure Ratio 10 FIGURE 8: Graph Showing COP's Against Condenser Temperature 11
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OBJECTIVE Investigate the performance of a vapour compression refrigerator with varying condenser pressures and temperatures. INTRODUCTION Refrigeration is a process of pumping energy from a low temperature region to hot temperature region. This heat energy transfer requires a work done on the system. A refrigerator consists of mainly for sections, evaporator, compressor, condenser and a throttling devise. The refrigerator uses refrigerant as working fluid. This refrigerant exists in vapour form at normal atmospheric temperature and pressure. The energy from cold temperature source is being carried out by the refrigerant in the evaporator. Due to the energy absorption the refrigerant becomes vapour and it passes through the compressor where it gets compressed. The temperature and pressure of the refrigerant increases and then it passes through the condenser. The refrigerant gets condensed in the condenser and it reforms its liquid state. The pressure of this liquid is reduced in the throttle section .Finally it reaches the evaporator and thus cycle completed. (Kurmi, 2006) FIGURE1: Simple Vapour Compression Refrigeration System (Kurmi, 2006)
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THEORY The principle behind the refrigeration is second law of thermodynamics. According to Clausius statement it is impossible for a device to receive heat from a cold region to hot region without a work transfer. So there should be a work applied to the system to transfer energy from cold source to hot source. And the refrigerator working under Carnot cycle gives the maximum performance. Coefficient of performance of refrigerator can be write as
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  • Winter '16
  • Thermodynamics, Carnot cycle, pressure ratio, shaft power

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