The Application And Study Of An Ejector In The Refrigeratory Economisation For The Ship

Refrigeration technology achieves quite extensive application not only on shore but also on neoteric ships. Shipping cold store is not a part of dynamic force equipment and is not relative to sailing, but it has important relationship with running expenses and becomes indispensable one among equipment on ship. So shipping cold store system is required to run with kilter, especially reefer. As we all know, the back-pressure valve (also called evaporating pressure regulator) is often used to regulate the evaporating temperature of every high-temperature refrigeratory in the system containing many different temperatures but single engine of the ship. But it is neglected that the energy of the system is lost and the efficiency of the system becomes low. Based on this, the paper puts for ward the new cycle theory in the high and low temperature refrigeratory of the ship. A ejector for is applied in this theory. It can not only regulate the evaporating temperature of each high-temperature refrigeratory but also reduce the back-pressure of the compressor when a system applies this theory. At the same time, the exhaust temperature of the compressor becomes low and the refrigerating capacity per unit of swept volume becomes high. It leads to the coefficient of performance and exergy efficiency increased. Application of this technology to shipping cold store can reduce energy consumption effectively and achieve satisfactory economic and social benefits.The author has completed much theoretic study to prove the feasibility of the ejector with the first and second law of thermodynamics. The paper introduces the necessity the purpose and some study methods separately. It also introduces the actuality of the ship refrigerated carrying, types of the refrigeration systems of the ship the stand-alone and more storerooms system in the high and low temperature refrigeratory system of the ship, some advantages of the new cycle ,the principle of the erector, the parameter design theory and construction size of the ejector in the new refrigeration cycle, the test study in the high and low temperature refrigeratory system of the shipwhich includes the test device, the operation console, the principle chart of the refrigeration system, the computer testing results and so on. This paper involves the refrigeration principle and technology, the thermodynamics principle, the exergy analyses principle and its applications, the sensor principle and its applications, the microcomputer testing technique, the auxiliary engine of the ship etc.At the same time, to realize the measuring of cold store running parameters so that the main equipment of this system can run safely and reliably, measuring points are disposed at inlet and outlet of main devices, and computer detecting technology is used to measure the real time data at every point. Software is developed on the basis of luban configuration software, and it can display dynamic detecting data as well as trend diagram, and can save fully history data. These can help manager analyze perennial running state of cold store system and set down better measures.The new refrigeration cycle theory with the ejector for the high and low temperature refrigeratory of the ship is a concrete tryout and efficient practice which involves the modern computer technology in the ship testing technique. It needs further study.