本文選題：兩級(jí)壓縮循環(huán) + 空氣源熱泵　； 參考：《東華大學(xué)》2014年碩士論文

【摘要】：現(xiàn)階段我國(guó)經(jīng)濟(jì)飛速發(fā)展,城市化進(jìn)程不斷加快,能源過度消耗的問題愈發(fā)嚴(yán)重�？諝庠礋岜孟到y(tǒng)作為一種高效、節(jié)能、環(huán)保的裝置,非常符合我國(guó)的能源狀況和環(huán)境要求,并且已在我國(guó)長(zhǎng)江中下游、華南及西南等地區(qū)得到廣泛應(yīng)用。由于北方地區(qū)氣溫較低,空氣源熱泵在推廣過程中出現(xiàn)了很多問題,采用普通的空氣源熱泵系統(tǒng)會(huì)發(fā)現(xiàn)壓縮機(jī)的排氣溫度過高,輸氣系數(shù)劇減,壓縮機(jī)壓比過大,其制熱能力和性能系數(shù)都大大降低,系統(tǒng)頻繁啟停,無法正常工作。本論文提出可以采用兩級(jí)壓縮兩級(jí)節(jié)流中間不完全冷卻空氣源熱泵系統(tǒng),建立理論循環(huán)模型,并對(duì)模型進(jìn)行優(yōu)化分析。具體主要研究?jī)?nèi)容如下： 本課題通過介紹兩級(jí)壓縮熱泵系統(tǒng)的研究背景及發(fā)展。引入對(duì)空氣源熱泵系統(tǒng)的原理和過程的研究,分別建立單級(jí)壓縮空氣源熱泵系統(tǒng)模型和四種兩級(jí)壓縮空氣源熱泵系統(tǒng)模型,四種兩級(jí)壓縮模型為：兩級(jí)節(jié)流中間不完全冷卻、兩級(jí)節(jié)流中間完全冷卻、一級(jí)節(jié)流中間不完全冷卻、一級(jí)節(jié)流中間完全冷卻。通過單級(jí)壓縮模型和兩級(jí)壓縮模型對(duì)比,得出兩級(jí)壓縮系統(tǒng)在降低系統(tǒng)壓縮比、排氣溫度等方面優(yōu)于單級(jí)壓縮。通過兩級(jí)壓縮四種循環(huán)的對(duì)比,得出兩級(jí)壓縮中間不完全冷卻循環(huán)形式因制熱效率高、排氣溫度低等優(yōu)點(diǎn),可以作為一種比較理想的兩級(jí)壓縮循環(huán)方式應(yīng)用于北方地區(qū)。 在此基礎(chǔ)上,本課題基于已經(jīng)建立的兩級(jí)壓縮兩級(jí)節(jié)流中間不完全冷卻制熱循環(huán)模型,分兩種情況來研究重要參數(shù)。兩種情況分別是壓縮機(jī)輸氣量可變和壓縮機(jī)輸氣量不可變,重要參數(shù)為性能系數(shù)COP、單位制熱量、工質(zhì)質(zhì)量流量、壓縮機(jī)軸功率、高壓級(jí)排氣溫度等參數(shù)隨蒸發(fā)溫度的變化情況。本課題將壓縮機(jī)輸氣量不可變情況下的參數(shù)：系統(tǒng)壓縮比、高壓級(jí)壓縮機(jī)排氣溫度、低壓級(jí)壓縮機(jī)吸氣比容、制熱量和性能系數(shù)COP的模擬值和其他文獻(xiàn)實(shí)驗(yàn)值對(duì)比。 其次,對(duì)兩次節(jié)流中間不完全冷卻兩級(jí)壓縮空氣源熱泵系統(tǒng),提出一種多目標(biāo)優(yōu)化方法,以單位制熱量和性能系數(shù)COP為優(yōu)化對(duì)象,以中間壓力為優(yōu)化變量。當(dāng)COP和單位制熱量同等重要時(shí),COP少量降低,系統(tǒng)的單位制熱量增加,減少能耗和環(huán)境污染的同時(shí),滿足冬季室內(nèi)熱舒適性和生活衛(wèi)生用熱水需求。當(dāng)蒸發(fā)溫度-30℃,冷凝溫度30℃時(shí),可使系統(tǒng)的單位制熱量增加3.1%,而COP僅降低1.6%,COP達(dá)到2.6。當(dāng)蒸發(fā)溫度-30℃,冷凝溫度60℃時(shí),可使系統(tǒng)的單位制熱量增加3.6%,而COP僅降低1.8%,COP達(dá)到1.9,最后,對(duì)未來的研究趨勢(shì)提出設(shè)想與展望。
[Abstract]:At present, the economy of our country is developing rapidly, the process of urbanization is speeding up, and the problem of excessive consumption of energy is becoming more and more serious. Air source heat pump system, as a kind of high efficiency, energy saving and environmental protection device, has been widely used in the middle and lower reaches of the Yangtze River, South China and Southwest China. Because of the low temperature in the northern region, there are many problems in the popularization of air-source heat pump. Using the ordinary air-source heat pump system, it will be found that the exhaust temperature of the compressor is too high, the gas transmission coefficient is greatly reduced, and the pressure ratio of the compressor is too large. Its heating capacity and performance coefficient are greatly reduced, the system frequently start and stop, can not work normally. In this paper, a two-stage compression two-stage air source heat pump system with intermediate incomplete cooling is proposed, and the theoretical cycle model is established, and the model is optimized and analyzed. The main research contents are as follows: This paper introduces the research background and development of two-stage compression heat pump system. By introducing the principle and process of air-source heat pump system, the single-stage compressed air source heat pump system model and four two-stage compressed air source heat pump system models are established. The four two-stage compression models are: two-stage throttling incomplete cooling, The two-stage throttling is completely cooled, the first-stage throttling is not completely cooled, and the first-stage throttling is completely cooled. By comparing the single-stage compression model with the two-stage compression model, it is concluded that the two-stage compression system is superior to the single-stage compression system in reducing the compression ratio and exhaust temperature. Through the comparison of four cycles of two-stage compression, it is concluded that the incomplete cooling cycle in the middle of two-stage compression can be used as an ideal two-stage compression cycle in northern China because of its high heating efficiency and low exhaust temperature. Based on the established two-stage compression and two-stage throttling incomplete cooling and heating cycle model, the important parameters are studied in two cases. The main parameters are the performance coefficient COP, the unit heating capacity, the mass flow rate of the working fluid, the axial power of the compressor, the exhaust temperature of the high pressure stage and so on. In this paper, the parameters of the compressor under the condition of immutable air output: system compression ratio, exhaust temperature of the high pressure stage compressor, suction specific volume of the low pressure stage compressor, heating capacity and performance coefficient COP are compared with other experimental results. Secondly, a multi-objective optimization method is proposed for two-stage compressed-air source heat pump system with two throttling intermediate incomplete cooling. The optimization object is the unit heating capacity and the performance coefficient COP, and the intermediate pressure is the optimization variable. When the COP and the unit heating amount are equally important, the cop decreases slightly, the unit heating capacity of the system increases, the energy consumption and environmental pollution are reduced, and the indoor thermal comfort and sanitary hot water demand are met in winter. When the evaporation temperature is -30 鈩，

本文編號(hào)：1984617