泵与压缩机双动力直膨式制冷系统的理论分析与实验研究

发布时间：2018-05-04 23:39

本文选题：双动力直膨式 + 冷凝压力浮动变化　；参考：《天津商业大学》2014年硕士论文

【摘要】：本课题研究的出发点为,我国大部分地区处于亚热带气候区,四季变化明显,冬、夏两季环境温差较大。本文充分利用我国地理气候现状,较大幅度降低直膨式制冷系统运行冷凝压力,实现制冷效率较大幅度的提升,从而减少能源消耗量,并降低环境污染程度。本文提出一种介于传统直膨式制冷系统(Traditional Direct Expansion Refrigeration System-TDX)与泵供液制冷系统(Refrigeration System with Pump Circulation-RPC)之间的的一种新的制冷系统：泵与压缩机双动力直膨式制冷系统(The Dual Power Direct Expansion Refrigeration System of Pump and Compressor-DXPC)。此制冷系统是在TDX制冷系统的基础上在储液器与膨胀阀之间的液体管路上加装工质泵,变为DXPC制冷系统。此制冷系统的特点为：压缩机主要负责制冷剂气体的压缩,泵主要负责液体制冷剂的输送。由于泵承担了系统供液的主要责任,那么压缩机的排气压力可以降低,即系统的冷凝压力可以降低。从而可以使冷凝压力随着外界环境温度变化而浮动变化。当外界环境温度较低时,冷凝压力也可以较低,从而提高压缩机的制冷量并降低其耗能,同时泵增加的耗功相对压缩机减少的耗功较少,进而实现整个制冷系统效率的提高,降低运行与维护费用,使环境更加友好,达到节能减排的目的。本文通过理论分析和实验研究得出DXPC制冷系统如下优点： 1.与TDX制冷系统比较,冷凝压力降低,制冷效率提高。 2.与RPC制冷系统比较,制冷剂充注量大大减少。 3.噪音降低,环境更加友好。 4.减少压缩机故障率,延长压缩机使用寿命,降低运行维护费用。
[Abstract]:The starting point of this research is that most of China is in the subtropical climate area, the change of four seasons is obvious, and the difference of environment temperature between winter and summer is great. In this paper, we make full use of the present situation of geographical climate in our country, greatly reduce the condensing pressure of direct-expansion refrigeration system, and achieve a large increase in refrigeration efficiency, thus reducing energy consumption and reducing the degree of environmental pollution. In this paper, a new refrigeration system, the Dual Power Direct Expansion Refrigeration System of Pump and Compressor-DXPC system, is proposed, which is between the traditional Direct Expansion Refrigeration system TX and the Refrigeration System with Pump Circulation-RPC. On the basis of the TDX refrigeration system, the refrigerant pump is added to the liquid pipeline between the liquid accumulator and the expansion valve, and the DXPC refrigeration system is changed. The characteristics of this refrigeration system are: compressor mainly responsible for refrigerant gas compression, pump mainly responsible for the transportation of liquid refrigerant. As the pump bears the primary responsibility for the system, the compressor exhaust pressure can be reduced, that is, the condensing pressure of the system can be reduced. Thus, the condensing pressure can fluctuate with the change of ambient temperature. When the external temperature is low, the condensing pressure can also be lower, which can increase the refrigerating capacity of the compressor and reduce its energy consumption. At the same time, the increased energy consumption of the pump is less than that of the compressor, and the efficiency of the whole refrigeration system can be improved. Reduce the cost of operation and maintenance, make the environment more friendly, achieve the purpose of energy saving and emission reduction. In this paper, the advantages of DXPC refrigeration system are obtained by theoretical analysis and experimental research. 1. Compared with the TDX refrigeration system, the condensing pressure is reduced and the refrigeration efficiency is improved. 2. Compared with RPC refrigeration system, refrigerant charge is greatly reduced. 3. The noise is reduced and the environment is more friendly. 4. Reduce compressor failure rate, prolong compressor service life, reduce operating and maintenance costs.
【学位授予单位】：天津商业大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TB657

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