發(fā)布時間：2018-09-13 11:13

【摘要】：在跨臨界CO_2熱泵熱水器系統(tǒng)中引入優(yōu)化設計的噴射器,對系統(tǒng)進行實驗研究,分析了制熱系數(shù)、引射比、升壓比、噴射器效率等參數(shù)隨熱水體積流量和出口溫度及高壓側壓力的變化趨勢以及優(yōu)化設計的噴射器對系統(tǒng)的影響。實驗結果表明:隨著熱水體積流量減小或其出口溫度增加,引射比將逐漸減小,而噴射器效率逐漸升高;在測試工況范圍內升壓比基本保持不變,系統(tǒng)COPh最高將近3.5;系統(tǒng)高壓側的壓力因優(yōu)化噴射器的引入而明顯降低,有利于系統(tǒng)的安全運行;跨臨界二氧化碳熱泵噴射循環(huán)系統(tǒng)存在一個最優(yōu)運行壓力,值得注意的是在最優(yōu)運行壓力下,熱水出水溫度雖未達到最高,但依舊超過55℃。系統(tǒng)穩(wěn)定運行在最優(yōu)高壓側壓力下,不僅系統(tǒng)性能大幅度提高,而且保證了熱水的出水溫度。
[Abstract]:An optimized ejector was introduced into the transcritical CO_2 heat pump water heater system. The system was experimentally studied. The heating coefficient, ejection ratio and booster ratio were analyzed. The variation trend of ejector efficiency with the volume flow of hot water, outlet temperature and high pressure lateral pressure, and the influence of optimized ejector on the system. The experimental results show that with the decrease of the volume flow rate of hot water or the increase of outlet temperature, the ejection ratio will gradually decrease, while the ejector efficiency will gradually increase, and the booster ratio will remain basically unchanged in the range of test conditions. The maximum COPh of the system is about 3.5; the pressure on the high pressure side of the system is obviously reduced because of the introduction of the optimized ejector, which is beneficial to the safe operation of the system; there is an optimal operating pressure in the trans-critical carbon dioxide heat pump injection cycle system. It is worth noting that under the optimal operating pressure, the effluent temperature of hot water does not reach the highest, but still exceeds 55 鈩，

本文編號：2241008