基于高溫熱泵再生的轉輪除濕空調機組的設計與性能研究
發(fā)布時間:2018-03-11 18:12
本文選題:高溫熱泵 切入點:除濕轉輪 出處:《天津大學》2014年博士論文 論文類型:學位論文
【摘要】:本文提出高溫熱泵轉輪除濕空調系統(tǒng),立足于硅膠轉輪的凈化及除濕作用,利用熱泵的蒸發(fā)器對熱空氣降溫冷卻,使其達到送風溫度;同時利用熱泵的冷凝器釋放的熱量加熱再生空氣,使系統(tǒng)內(nèi)部實現(xiàn)冷量和熱量的相互抵消,實現(xiàn)空氣溫濕度獨立處理,改善室內(nèi)空氣品質,達到系統(tǒng)節(jié)能的目的。 通過理論分析確定了空調系統(tǒng)供冬夏季使用的三種運行模式,并根據(jù)實驗研究的數(shù)據(jù),分別驗證了單級系統(tǒng)和雙級系統(tǒng)的可行性,最終確定采用單級系統(tǒng)進行實驗,并依據(jù)設計流程制造高溫熱泵轉輪除濕空調機組。 對自主研發(fā)的工質BY-3的性能進行了測試,驗證了其高溫特性,并采用BY-3作為工質,從硅膠轉輪的除濕效果的角度,評價熱泵和轉輪的匹配性,得出轉輪在再生溫度為60~65℃之間時,絕熱效率最高。隨后,研究了高溫熱泵轉輪除濕空調系統(tǒng)對于氣候變化的適應性及性能。研究結果表明,當室外溫度不超過36℃時,空調系統(tǒng)的送風溫度滿足20±1℃的要求,,該系統(tǒng)獲得的再生溫度滿足除濕轉輪的再生要求。轉輪除濕效率較高,夏季工況平均除濕效率為32.7%。室外熱濕環(huán)境和再生風量對熱泵的性能影響較大,高溫熱泵的最大制熱性能系數(shù)為2.76,最大制冷性能系數(shù)為2.26。 重點分析了動態(tài)運行的空調系統(tǒng)中除濕轉輪的性能。結果表明,相比室外空氣溫度和再生風量與處理風量比率,室外空氣含濕量和再生溫度對評價指標(MRC、ηdeh、DCOP、SER)的影響更大,回歸方程的擬合效果較好,平均相對誤差和最大相對誤差均在合理范圍內(nèi)。 對高溫熱泵轉輪除濕空調系統(tǒng)進行了分析。結果表明,壓縮機的熱力完善度和效率均最低,需要對壓縮機進行技術改造,或采用變頻壓縮機。高溫熱泵轉輪除濕系統(tǒng)的效率為8.17%,比添加加熱器的除濕轉輪系統(tǒng)的效率提高近167%,說明利用高溫熱泵冷凝熱作為再生熱源可明顯提高系統(tǒng)能源使用效率。 使用Visual Basic軟件建立常規(guī)再熱空調系統(tǒng)的數(shù)學模型,并對數(shù)學模型進行驗證,將高溫熱泵轉輪除濕空調系統(tǒng)與常規(guī)再熱空調系統(tǒng)進行性能比較,標準工況下,高溫熱泵轉輪除濕空調系統(tǒng)節(jié)能百分比為38.8%。通過對高溫熱泵轉輪除濕系統(tǒng)節(jié)能趨勢的分析,看出該系統(tǒng)在干熱環(huán)境下比濕熱環(huán)境下更具有節(jié)能潛力。
[Abstract]:In this paper, the desiccant air conditioning system of high temperature heat pump runner is put forward. Based on the purification and dehumidification function of silica gel runner, the heat pump evaporator is used to cool down the hot air and make it reach the air supply temperature. At the same time, the heat released from the condenser of heat pump is used to heat the regenerated air, which makes the cooling and heat cancel each other in the system, realizes the independent treatment of air temperature and humidity, improves the indoor air quality, and achieves the purpose of energy saving in the system. Through theoretical analysis, three operation modes of air conditioning system for winter and summer are determined. According to the experimental data, the feasibility of single stage system and two stage system are verified, and the single stage system is finally adopted to carry out the experiment. And according to the design process manufacturing high-temperature heat pump runner dehumidification air-conditioning unit. The performance of self-developed working fluid BY-3 is tested and its high temperature characteristic is verified. The matching of heat pump and runner is evaluated by using BY-3 as working medium from the angle of dehumidification effect of silica gel runner. The highest adiabatic efficiency of the runner is obtained when the regeneration temperature is between 60 鈩
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