發(fā)布時(shí)間：2018-03-17 07:05

  本文選題：制冷　切入點(diǎn)：潛熱回收　出處：《大連海事大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

【摘要】：隨著能源危機(jī)和環(huán)境污染日益嚴(yán)重,節(jié)能減排工作已經(jīng)成為了各國(guó)的共同責(zé)任。每年,航運(yùn)業(yè)都消耗了大量的能源,為了提高能源利用率,減少環(huán)境污染,利用船舶余熱日益成為各國(guó)學(xué)者的研究熱點(diǎn)。 與船舶上常用的壓縮式制冷系統(tǒng)相比,噴射式制冷系統(tǒng)具有結(jié)構(gòu)簡(jiǎn)單,無(wú)運(yùn)動(dòng)部件,能利用船舶主機(jī)余熱的優(yōu)點(diǎn)。因此,對(duì)于船舶余熱的再利用,本文提出的潛熱回收型噴射式制冷系統(tǒng),以船舶主機(jī)余熱作為潛熱回收型噴射式制冷系統(tǒng)的熱源,充分利用冷凝潛熱,對(duì)系統(tǒng)進(jìn)行性能分析。 與傳統(tǒng)噴射式制冷系統(tǒng)相比,潛熱回收型系統(tǒng)在冷凝器與主噴射器之間增加了一個(gè)增壓噴射器,回收冷凝器中未被冷凝氣體的潛熱。本文針對(duì)潛熱回收型噴射式制冷系統(tǒng)進(jìn)行系統(tǒng)熱力計(jì)算,探討了潛熱回收型噴射式制冷系統(tǒng)COP高于傳統(tǒng)噴射式制冷系統(tǒng)COP的條件,研究并分析了R11、R12、R123、R134a、R600a、水六種制冷劑的兩種制冷系統(tǒng)在相同工作條件下的工作性能,并確定水作為潛熱回收型噴射式制冷系統(tǒng)的制冷劑。對(duì)以水作為系統(tǒng)制冷劑的潛熱回收型噴射式制冷系統(tǒng)進(jìn)行了變工況性能分析,研究了潛熱回收型噴射式制冷系統(tǒng)較傳統(tǒng)噴射式制冷系統(tǒng)性能優(yōu)越的工作范圍。 噴射器作為系統(tǒng)的核心部件,其性能對(duì)系統(tǒng)的工作性能有很大的影響。本文基于索科洛夫氣動(dòng)函數(shù)法,以工作流體溫度90℃、引射流體溫度10℃、冷凝溫度30℃對(duì)系統(tǒng)的主噴射器進(jìn)行設(shè)計(jì),確定噴射器的結(jié)構(gòu)尺寸。并使用Fluent軟件對(duì)主噴射器進(jìn)行數(shù)值模擬,模擬出噴射器內(nèi)部流動(dòng)狀況。利用數(shù)值模擬方法研究并分析了工作流體參數(shù)、引射流體參數(shù)以及出口背壓以及噴射器結(jié)構(gòu)參數(shù)對(duì)噴射器引射系數(shù)的影響。
[Abstract]:With the energy crisis and environmental pollution becoming more and more serious, energy-saving and emission reduction work has become the common responsibility of all countries. Every year, the shipping industry consumes a lot of energy, in order to improve energy efficiency and reduce environmental pollution, The utilization of ship heat has become a hot research topic of scholars all over the world. Compared with the compression refrigeration system commonly used in ships, the jet refrigeration system has the advantages of simple structure, no moving parts and the ability to utilize the residual heat of the main engine of the ship. In this paper, the latent heat recovery jet refrigeration system is put forward. The residual heat of the ship engine is used as the heat source of the latent heat recovery jet refrigeration system, and the performance of the system is analyzed by making full use of the condensing latent heat. Compared with the traditional jet refrigeration system, the latent heat recovery system adds a turbocharger between the condenser and the main ejector. The latent heat of uncondensed gas in condenser is recovered. In this paper, the thermodynamic calculation of the latent heat recovery jet refrigeration system is carried out, and the condition that the COP of the latent heat recovery jet refrigeration system is higher than that of the traditional jet refrigeration system COP is discussed. The performance of two refrigeration systems with six refrigerants, R11, R12, R123N, R134a, R600a, under the same working conditions, has been studied and analyzed. Water is determined as the refrigerant of the latent heat recovery jet refrigeration system. The performance of the latent heat recovery jet refrigeration system with water as the refrigerant is analyzed. The working range of latent heat recovery ejector refrigeration system is studied which is superior to that of traditional jet refrigeration system. As the core component of the system, the performance of the ejector has a great influence on the working performance of the system. Based on the Sokolov pneumatic function method, the working fluid temperature is 90 鈩，

本文編號(hào)：1623654