本文選題：(?)損失系數　切入點：(?)平衡　出處：《西安建筑科技大學》2013年碩士論文　論文類型：學位論文

【摘要】：日常生活中,人們在對冷量需要的同時還有對熱量的需求,為了同時滿足這兩種需求,業(yè)內研究人員設計了一系列比較節(jié)能的系統(tǒng),目前,得到普遍應用的是具有熱回收功能的制冷機或空調機組,但此方案存在著不足之處,即其制熱量是有限的,為了解決這個問題,近年,本課題組提出了一種可同時供冷供熱的雙級壓縮制冷熱泵循環(huán),并依據熱力學第一定律對此循環(huán)進行了理論分析,結果發(fā)現其具有更經濟、更節(jié)能的優(yōu)勢,同時也很好的解決了熱回收式制冷系統(tǒng)所出現的問題。本文是對該循環(huán)系統(tǒng)的更深入研究,期望通過(?)分析找出系統(tǒng)存在的薄弱環(huán)節(jié),指出系統(tǒng)進一步改善的途經和方向。 即于此,本文建立了該系統(tǒng)各個部件(高低壓壓縮機、熱水加熱器、熱源側換熱器、用戶側換熱器、節(jié)流閥G、節(jié)流閥H)的(?)分析模型,然后依據(?)分析方法的主要評價指標進行計算,在此基礎上著重分析了室外空氣溫度ta、制冷劑流量比α、冷凝溫度tc、蒸發(fā)溫度te、過冷度、傳熱溫差△t對系統(tǒng)(?)效率的影響,并且通過對比系統(tǒng)各部件的(?)損失系數和(?)損率,找出了系統(tǒng)的薄弱環(huán)節(jié),結果顯示：在低制冷劑流量比下,系統(tǒng)(?)損失的主要部位為熱源側換熱器D、冷凝器C、節(jié)流閥G、高壓壓縮機B；在高制冷劑流量比下,系統(tǒng)(?)損失的主要部位為節(jié)流閥H、冷凝器C、高壓壓縮機B、低壓壓縮機A。 在此基礎上對系統(tǒng)進行了優(yōu)化,給出了優(yōu)化后系統(tǒng)的(?)分析模型,并進行了全面的分析計算,與優(yōu)化前的系統(tǒng)進行了對比,結果發(fā)現：經濟器能提高系統(tǒng)的(?)效率、彌補系統(tǒng)存在的薄弱環(huán)節(jié)。
[Abstract]:In daily life, people need both cooling and heat. In order to meet these two needs, researchers in the industry have designed a series of more energy-efficient systems. Refrigerators or air conditioners with heat recovery function are widely used, but this scheme has some shortcomings, that is, its heating capacity is limited. In order to solve this problem, in recent years, This paper presents a two-stage compression refrigeration heat pump cycle which can be used for cooling and heating at the same time. According to the first law of thermodynamics, this cycle is theoretically analyzed. The results show that the cycle is more economical and energy saving. At the same time, it also solves the problem of heat recovery refrigeration system. The weak links of the system are analyzed and the ways and directions of further improvement are pointed out. In this paper, the components of the system (high and low pressure compressor, hot water heater, heat source side heat exchanger, user side heat exchanger, throttle valve G, throttle valve H) are established. Analysis of the model, and then based on? Based on the calculation of the main evaluation indexes of the analytical method, the outdoor air temperature ta, the refrigerant flow ratio 偽, the condensation temperature TC, the evaporation temperature tete, the undercooling degree, the heat transfer temperature difference t to the system are analyzed emphatically. The impact of efficiency, and by comparing the components of the system? Coefficient of loss and? The result shows that under the low refrigerant flow ratio, the system is weak. The main parts of loss are heat source side heat exchanger D, condenser C, throttle valve G, high pressure compressor B. The main parts of loss are throttle H, Condenser C, High pressure Compressor B, low pressure Compressor A. On this basis, the system is optimized, and the optimized system is given. The model is analyzed and calculated, and compared with the system before optimization, the result shows that the economizer can improve the system. Efficiency, make up for the weakness of the system.
【學位授予單位】：西安建筑科技大學
【學位級別】：碩士
【學位授予年份】：2013
【分類號】：TU83

【參考文獻】

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本文編號：1595023