Lab2_AirConditioner - Lab #2: Air Conditioning Unit...

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Lab #2: Air Conditioning Unit Refrigeration Cycle and Air Handling System MANE–4020 Section 1, Group 2 Thermals and Fluids Laboratory March 17, 2008 Authors: Creighton Adsit Mike Beanland Carl Hansen Joe Larsen
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MANE 4020: Thermal and Fluids Lab, Spring 2008 1 Page 1 of 24 I. Abstract: In this experiment a laboratory air conditioning system is analyzed under two separate air circulation conditions. In the first case, no air is re-circulated. In the second case, a mixture of fresh air, re-circulating air, and added steam is used. Ratings such as the COP of the refrigeration cycle, and NTU size rating of the cooling heat exchanger were calculated from data retrieved from the two situations. These properties were then compared with each other to evaluate the relative effectiveness of heat transfer and energy efficiency of these two situations. From the analysis performed it was determined that the air conditioning unit’s heat exchanger functioned more effectively with the humid, re-circulated air at the cost of lower energy performance of the refrigeration cycle Table of contents Section Page Number I. Abstract 1 Variable Naming Reference 2 II. Introduction 3 III. Apparatus Details 3–5 IV. Procedure 6 V. Results 6–9 VI. Conclusion 9–10 VII. References 10 Appendix A: Sample Calculations 10–16 Part 1: Refrigeration Cycle 10–11 Part 2: Mass Flow Rates 12–14 Part 3: Heat Exchanger 14–15 Part 4: Mixing Chamber 15–16 Appendix B: Sample Evaluations of Properties 16–18 Appendix C: Error Analysis 19 Appendix D: Refrigeration Cycle Data 20–21 Appendix E: Air Handling System Data (Pressure Drops/Condensate) 22 Appendix F: Air Handling System Data (Thermocouples) 23–24
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MANE 4020: Thermal and Fluids Lab, Spring 2008 2 Page 2 of 24 Variable Naming Reference: Symbol Concept Units Note A Surface Area m 2 C Heat capacity rate kJ/(°K*sec) p c * m C & C * Heat capacity ratio Unitless max min * C / C C COP E Electrical Coefficient of Performance Unitless Heat Absorbed ÷ Electricity used COP R Thermal Coefficient of Performance Unitless Heat Absorbed ÷ Work added c p Specific Heat for Constant Pressure kJ/(kg°K) h Specific Enthalpy kJ/kg I Electric Current Amperes m & Mass Flow Rate kg/sec NTU Number Transfer Units Unitless Heat exchanger size: UA/C min P Pressure kPa P Orifice Pressure Difference mmH 2 O Q & Heat Transfer Rate Watts T Temperature °C T Xd Dry Bulb Temperature of Thermocouple X °C T Xs Sling Temperature of Thermocouple X °C Wet bulb temp. at high airspeed T Xw Wet Bulb Temperature of Thermocouple X °C U Overall Heat Transfer Coefficient Watts/(m 2 °K) v Specific Volume m 3 /kg w & Work Rate Watts ε Heat Exchanger Effectiveness Unitless (ActualQ & ) ÷ (Max. PossibleQ & ) ξ Electric Voltage Volts η Mechanical Efficiency Unitless Work done ÷ Electricity used ρ Density kg/m 3 ω Humidity Ratio kg H2O /kg DryAir mass of water/dry air mass
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MANE 4020: Thermal and Fluids Lab, Spring 2008 3 Page 3 of 24 II. Introduction: Refrigeration cycles can be seen implemented widely in everyday life. Such cycles are used in cars, buildings, and household appliances to name a few. Refrigeration cycles enable maintaining a low
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Lab2_AirConditioner - Lab #2: Air Conditioning Unit...

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