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220548987 Refrigerant Unit

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refrigeration unit lab report
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  1 UNIVERSITI TEKNOLOGI MARA FAKULTI KEJURUTERAAN KIMIA PROCESS ENGINEERING LABORATORY 1 (CPE435) No. Title Allocated Marks (%) Marks 1 Abstract/Summary 5 2 Introduction 5 3 Aims 5 4 Theory 5 5 Apparatus 5 6 Methodology/Procedure 10 7 Results 10 8 Calculations 10 9 Discussion 20 10 Conclusion 5 11 Recommendations 5 12 Reference / Appendix 5 13 Supervisor’s grading 10 TOTAL MARKS 100 Remarks: Checked by: Rechecked by: --------------------------- --------------------------- Date: Dat NAME : MUHAMMAD MUKMIN BIN ZAHARI STUDENT ID. : 2011461308 GROUP : EH220 2C EXPERIMENT : REFRIGERANT UNIT DATE PERFORMED : 02 TH  APRIL 2012 SEMESTER : 2 PROGRAMME / CODE : EH220 SUBMIT TO : CIK SITI NOR ADIEB BT IDRIS  2 Table of content Table of content .............................................................................................................................. 2 Abstract ........................................................................................................................................... 3 Introduction ..................................................................................................................................... 4 Aims ................................................................................................................................................ 5 Theory ............................................................................................................................................. 6 Apparatus ........................................................................................................................................ 9 Experimental procedure ................................................................................................................ 10 RESULTS ..................................................................................................................................... 12 Experiment 1.............................................................................................................................. 12 Experiment 2.............................................................................................................................. 13 Experiment 3.............................................................................................................................. 19 Experiment 4.............................................................................................................................. 23 Discussion .................................................................................................................................. 26 Conclusion .................................................................................................................................... 28 Recommendations ......................................................................................................................... 29 References ..................................................................................................................................... 30 Appendices .................................................................................................................................... 31    3  Abstract This experiment is carried out to study the mechanical heat pump through the operating of the equipment SOLTEQ Mechanical Heat Pump (Model: HE165). This experiment is conducted by doing a series of tests by manipulating the delivery temperatures and flow rates of the cooling water. Plus, to study the mechanism of a heat pump, coefficient of performance and heat pump performance curves. Besides, this experiment is investigating the effects of compressor pressure ratio on the volumetric efficiency. The purpose of conducting this experiment is to study the thermodynamics concept of energy balance and coefficient of  performance. The heat transfer is been able to determine by applying the energy balance concept.  Next, able to determine the coefficient of performance of the heat pump and how the delivery temperatures affect the coefficient of performance. Lastly, to produce the performance curves of the heat pump and vapour compression cycle on a p-h diagram.  4 Introduction In the experiment of refrigerant unit, the Mechanical Heat Pump is used to study the vapour compression cycle. This Mechanical Heat Pump (Model: HE 165) has been designed to  provide students with a practical and quantitative demonstration of the vapour compression cycle. Refrigerators and heat pumps are both use the vapour compression cycle, and although the applications of these machines differ, the components are essentially the same. The HE 165 is capable of demonstrating the heat pump application where a large freely available energy source, such as the atmosphere, is to be upgraded for water heating. The unit will be of particular interest to those studying Mechanical Engineering, Energy Conservation, Thermodynamics, Building Services, Chemical Engineering, Plant and Process Engineering, and Refrigeration and Air Conditioning. The heat pump consists of a hermetic compressor, a water cooled condenser, a thermostatically controlled expansion valve and an air heated evaporator. The arrangements of the components are in a manner similar to that used for many domestic air-water heat pumps where they are visible from the front of the unit. During the operation, slightly superheated refrigerant (R134a) vapour enters the compressor from the evaporator and its pressure is increased. Thus, the temperature rises and the hot vapour then enters the water cooled condenser. Heat is given up to the cooling water and the refrigerant condenses to a liquid before passing to the expansion valve. Upon passing through the expansion valve the pressure of the liquid refrigerant is reduced. This causes the saturation temperature to fall to below that of the atmosphere. Thus, as it flows through the evaporator, there is a temperature difference between the refrigerant and the air being drawn across the coils. The resulting heat transfer causes the refrigerant to boil, and upon leaving the evaporator it has become slightly superheated vapour, ready to return to the compressor. The temperature at which heat is delivered in the condenser is controlled by the water flow rate and its inlet temperature. The evaporating temperature is l a r g e l y d e t e r m i n e d b y t h e ambient conditions. However, this can be limited, either by restricting the air intake to the evaporator, or by directing warmed air towards the intake. Instrumentations are all provided for the measurement of flowrates of both the refrigerant and cooling water, power input to the compressor, and all relevant temperatures.
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