本文關(guān)鍵詞：少量R744對R290空氣源熱泵熱水器性能影響的試驗研究　出處：《中原工學(xué)院》2017年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： R744/R290 空氣源熱泵熱水器 電子膨脹閥 開度 充罐量

【摘要】：臭氧層空洞問題有所好轉(zhuǎn)之際,全球氣候變暖卻在逐年加劇,在推進溫室氣體減排領(lǐng)域仍然面臨著一場攻堅戰(zhàn)。歐盟等發(fā)達(dá)國家已經(jīng)開始通過立法來限制高全球變暖潛能值HFCs制冷劑的使用,零ODP、低GWP的自然工質(zhì)又重新受到賞識。R744(CO2)屬于低溫高壓制冷劑,在熱泵制熱水方面極具優(yōu)勢,但對設(shè)備的材料強度和配件密封性的要求更苛刻;R290(丙烷)的ODP為零,GWP僅為20,與R22相比,具有較低的蒸氣壓力和較高的汽化潛熱,但易燃易爆是最大的安全隱患�；诟髯蕴攸c,以R290為主要組分,R744作為加入組分,將R744/R290混合工質(zhì)應(yīng)用于空氣源熱泵熱水器并展開深入研究。首先,在改造后的試驗臺上對R22制冷劑進行了試驗測試,試驗結(jié)果表明R22的充罐量在1.15kg時,系統(tǒng)的制熱性能系數(shù)最大為4.176;其次,對R290制冷劑進行了直接灌注式替代試驗,結(jié)果表明:R290系統(tǒng)的最佳充罐量為450g,其對應(yīng)的制熱性能系數(shù)最大為3.907。在R290系統(tǒng)的最優(yōu)充罐量下,設(shè)定不同的膨脹閥開度進行了試驗研究,結(jié)果表明:在脈沖開度300P時,R290系統(tǒng)的制熱性能系數(shù)最大為4.251,較直接灌注式替代試驗提高了8.8%;稍高于R22系統(tǒng),并且充罐量僅為R22的39.1%。根據(jù)R290系統(tǒng)不同開度的試驗性能,通過改變制冷劑的充罐量和膨脹閥開度,將R744/R290混合工質(zhì)應(yīng)用于空氣源熱水器并展開了進一步研究。結(jié)果表明:R744/R290混合工質(zhì)的最優(yōu)充罐量在525g附近,此時系統(tǒng)的制熱性能系數(shù)較高;混合工質(zhì)在最優(yōu)充罐量下,分別設(shè)定開度250P、275P、300P、325P、350P進行試驗,結(jié)果表明:最佳開度同樣為300P,其制熱性能系數(shù)最大為4.127,較直接灌注該配比混合制冷劑的COP提高13.2%,略低于R290系統(tǒng)(300P)的性能;推薦使用混合工質(zhì)充罐量為525g、開度為300P的組合應(yīng)用于空氣源熱泵熱水器。本文為R744/R290空氣源熱泵熱水器的進一步研究提供了有益參考,并且該混合制冷劑在環(huán)保性能方面很有優(yōu)勢,具有廣闊的市場前景。
[Abstract]:While the ozone hole problem has improved, global warming is getting worse year by year. The European Union and other developed countries have started legislation to limit the use of high global warming potential HFCs refrigerants, zero ODP. The natural working medium of low GWP is reappreciated. R744CO2) belongs to low temperature and high pressure refrigerant, and has the advantage in making hot water by heat pump. But the material strength of the equipment and the sealing requirements of accessories are more stringent; The ODP of R290 (propane) is only 20. Compared with R22, R290 has lower vapor pressure and higher latent heat of vaporization, but flammable and explosive is the biggest safety hazard. Using R290 as the main component and R744 as the addition component, the mixture of R744 / R290 was applied to air source heat pump water heater and studied deeply. R22 refrigerant was tested on the modified test rig. The results showed that the maximum heating performance coefficient of R22 was 4.176 when the tank filling capacity was 1.15kg. Secondly, the direct perfusion substitution test of R290 refrigerant is carried out. The results show that the optimal tank filling capacity of the system is 450 g. The maximum heating performance coefficient is 3.907. Under the optimal tank filling capacity of R290 system, different expansion valve opening is set up. The results show that the pulse opening is 300P. The maximum heating performance coefficient of R290 system is 4.251, which is higher than that of direct perfusion substitution test. It is a little higher than R22 system, and the tank filling capacity is only 39.1% of R22. According to the experimental performance of R290 system with different opening degree, by changing the filling capacity of refrigerant and the opening of expansion valve. The mixture of R744 / R290 and R744 / R290 was applied to the air source water heater and the results showed that the optimal filling capacity of the mixture of R744 / R290 was about 525g. The heating performance coefficient of the system is high. Under the optimal tank filling quantity, the opening degree of the mixed working fluid was set at 250Pn275Pn325Pn350P respectively. The results showed that the optimum opening degree was also 300P. The maximum heating performance coefficient is 4.127, which is 13.2% higher than that of COP directly infused with the mixed refrigerant, and is slightly lower than that of R290 system (300P). It is recommended that the tank filled with mixed working fluid should be 525g. The combination of the opening of 300P is applied to air source heat pump water heater. This paper provides a useful reference for the further study of R744 / R290 air source heat pump water heater. The mixed refrigerant has advantages in environmental protection and has a broad market prospect.
【學(xué)位授予單位】：中原工學(xué)院
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TU822

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