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Theoretical and Experimental Study on a Variable Capacity Air-source Heat Pump System with Ternary Mixture Refrigerants

Author: LiuDongFang
Tutor: ChenGuangMing
School: Zhejiang University
Course: Refrigeration and Cryogenic Engineering
Keywords: Refrigerant mixtures Heat pump Capacity Adjustment R23/R32/RI34a
CLC: TB65
Type: Master's thesis
Year: 2010
Downloads: 28
Quote: 0
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Abstract


Air source heat pump system is due to the characteristics of their safety , energy-saving , environmental protection , clean, efficient , has a wide range of applications in the areas south of the Yangtze River , but also in the application of the limitations : attenuation due to winter heating capacity heating capacity building heat load not match directly affect the thermal comfort . Refrigerant mixtures in the alternative refrigerants problem manifested advantage , as well as non - azeotropic refrigerant mixtures in capacity adjustment technology , provide a possibility to resolve the limitations of air source heat pump system . Based on this , the refrigerant mixtures in the new variable concentrations of heat pump systems test bench experiments and theoretical studies . The main contents are as follows : the first summarizes the development direction at home and abroad on the subject , is mainly reflected in the selection of the working fluid , and system design . Second, by theoretical calculations to determine of R23/R32/R134a ternary working fluid as the working fluid , and experimental study in new variable concentrations of heat pump systems test rig . Taking into account the system performance and the evaporation temperature , the relationship between the suction pressure and concentration is most closely related to the experimental part of the study the performance - the relationship between the evaporation temperature experiments and performance - suction pressure between experimental and experimental results with binary working fluid R32 / R134a to do a comparison . The experimental results show that : new ternary refrigerant mixtures manifested separation characteristics of the working fluid capacity and adjustable temperature range , the system performance is very good value . Then , according to the analysis of the experimental results were simulated and analyzed theoretically ability to adjust system capacity combined with the experimental results to analyze and compare the final analysis of the sources of error in the simulation process . Finally, by analyzing the system design emerged as abroad in variable concentrations capacity adjusting heat pump research , problems of existing experimental station exists in the course of the experiment , given the modification of the test system , so that the system to the product in the direction of forward a step further.

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CLC: > Industrial Technology > General industrial technology > Refrigeration Engineering > Refrigeration machinery and equipment
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