發(fā)布時(shí)間：2018-09-18 07:22

【摘要】：對空氣源熱泵熱水器的換熱性能進(jìn)行相關(guān)研究尤為重要。這是因?yàn)榭諝庠礋岜脽崴鞑粌H安全,能夠達(dá)到節(jié)約能源的目的,而且安裝使用方便、對環(huán)境無污染,更重要的是它還具有使用范圍廣,使用壽命長以及維護(hù)費(fèi)用低等優(yōu)點(diǎn)。通常來說,制冷工質(zhì)的特性和冷凝器換熱效果的好壞在某種程度上決定了空氣源熱泵熱水器的換熱性能的好壞。螺旋套管換熱器具有結(jié)構(gòu)緊湊、制造簡單、價(jià)格便宜以及傳熱強(qiáng)度高等優(yōu)點(diǎn),充分研究螺旋套管換熱器的凝結(jié)換熱過程具有重要的意義。尤其是在制冷劑替代過程中,螺旋套管環(huán)形空間制冷劑的換熱系數(shù)準(zhǔn)確性更是研究新型替代制冷劑凝結(jié)換熱性能所必需的關(guān)鍵參數(shù)之一。在當(dāng)今社會(huì),由于世界環(huán)保意識(shí)的提高,人們對制冷劑是否環(huán)保極為重視。就目前而言,R134a是最理想的替代R22的制冷劑。即使如此,兩者的熱物性并不相同,因此,對R134a的換熱性能及壓降特性進(jìn)行研究對改進(jìn)原有系統(tǒng)設(shè)備,研究、開發(fā)新的系統(tǒng)設(shè)備具有極為重要的意義。本文以R134a為工質(zhì),對空氣源熱泵熱水器采用螺旋套管冷凝器時(shí)的換熱性能與系統(tǒng)的運(yùn)行性能進(jìn)行實(shí)驗(yàn)研究。測試了循環(huán)加熱情況下,螺旋套管冷凝器的總換熱量、總換熱系數(shù)、壓縮機(jī)吸、排氣壓力,系統(tǒng)輸入功率,制熱量,制熱系數(shù)等隨冷凝器循環(huán)水流量及冷凝器入口水溫的變化情況;同時(shí),還測試了直流穩(wěn)態(tài)情況下,當(dāng)冷凝器入口水溫一定時(shí),螺旋套管冷凝器的總換熱量、總換熱系數(shù)、壓縮機(jī)吸、排氣壓力、系統(tǒng)輸入功率等隨冷凝器進(jìn)水流量的變化情況。(1)水流循環(huán)加熱時(shí),冷凝器進(jìn)水流量一定,隨著入口水溫的升高,冷凝器總換熱量減小,而總換熱系數(shù)增大,壓縮機(jī)吸、排氣壓力和輸入功率也是增大的,熱泵系統(tǒng)的制熱量和制熱系數(shù)卻隨入口水溫的增大而減小。當(dāng)螺旋套管冷凝器的進(jìn)水流量為1.19m3/h,冷凝器的入口水溫由25.2℃升高至63℃時(shí),冷凝器的總換熱量由7041.79W減小至2847.39W,總換熱系數(shù)由1184.12W/(m2·K)增大至1643.21 W/(m2·K),吸氣壓力由0.34MPa升高至0.38MPa,排氣壓力由0.77MPa升高至2.00MPa,系統(tǒng)輸入功率由1040W升高至2100W,系統(tǒng)的制熱性能系數(shù)COP由4.4減小到1.2,制熱量則由1387.83W減小為667.14W。(2)水流循環(huán)加熱,冷凝器入口水溫一定時(shí),隨著進(jìn)水流量的增大,冷凝器總換熱量和總換熱系數(shù)均增大,壓縮機(jī)吸、排氣壓力和系統(tǒng)輸入功率則是減小的,熱泵系統(tǒng)的制熱量和制熱系數(shù)隨進(jìn)水流量的增大而增大。當(dāng)入口水溫保持在24℃,螺旋套管冷凝器的進(jìn)水流量由1.19m3/h增大至2.16m3/h時(shí),冷凝器的總換熱量由4025.72W增大到7565.71W,總換熱系數(shù)由1472.03 W/(m2·K)增大到3956.29 W/(m2·K),吸氣壓力由0.36MPa下降至0.35MPa,排氣壓力由1.38MPa下降至1.27MPa,系統(tǒng)輸入功率由1488.67W減小到1423.75W,系統(tǒng)的制熱性能系數(shù)COP由2.5升高至3.0,制熱量則由986.90W增大到1087.06W。(3)直流穩(wěn)態(tài)條件下,當(dāng)冷凝器入口水溫一定時(shí),隨著進(jìn)水流量的增大,螺旋套管冷凝器總換熱量和總換熱系數(shù)是增大的,壓縮機(jī)吸、排氣壓力和系統(tǒng)輸入功率隨冷凝器進(jìn)水流量的增大反而降低。當(dāng)入口水溫保持在22℃,螺旋套管冷凝器的進(jìn)水流量由0.26 m3/h增大至0.71 m3/h時(shí),螺旋套管冷凝器的總換熱量由3614.24W增大至4165.96W,總換熱系數(shù)由1999.03 W/(m2·K)增大至2835.92W/(m2·K),壓縮機(jī)吸氣壓力由0.32MPa下降至0.30MPa,排氣壓力由0.84MPa下降至0.62MPa,系統(tǒng)輸入功率由1040W減小到920W。本文通過對螺旋套管冷凝器的換熱性能及熱泵運(yùn)行性能進(jìn)行實(shí)驗(yàn)研究及理論分析,得到螺旋套管冷凝器換熱性能及熱泵運(yùn)行性能與冷凝器入口水溫及進(jìn)水流量的變化關(guān)系,該研究有望為制冷劑替代中換熱器的優(yōu)化設(shè)計(jì)與熱泵熱水器的節(jié)能運(yùn)行提供參考。
[Abstract]:It is very important to study the heat transfer performance of the air source heat pump water heater. This is because the air source heat pump water heater is not only safe and energy-saving, but also easy to install and use, no pollution to the environment. More importantly, it has the advantages of wide range of use, long service life and low maintenance costs. The characteristics of refrigerant and the heat transfer effect of condenser determine the heat transfer performance of air source heat pump water heater to a certain extent. Spiral tube heat exchanger has the advantages of compact structure, simple manufacture, low price and high heat transfer intensity. Especially in the process of refrigerant substitution, the accuracy of heat transfer coefficient of spiral tube annular space refrigerant is one of the key parameters necessary to study the condensation heat transfer performance of a new type of alternative refrigerant. Even so, the thermal and physical properties of R134a and R22 are not the same. Therefore, it is very important to study the heat transfer performance and pressure drop characteristics of R134a for improving the original system equipment, researching and developing new system equipment. The total heat transfer capacity, total heat transfer coefficient, suction and exhaust pressure of the compressor, input power of the system, heat production coefficient and heat production coefficient of the condenser are tested. The total heat transfer capacity, total heat transfer coefficient, suction and exhaust pressure of the compressor, and the input power of the system are measured when the inlet water temperature of the condenser is constant under the condition of DC steady state. (1) When the water flow is circulated, the inlet water flow of the condenser is constant, and with the inlet water temperature rising, the total heat transfer coefficient of the condenser is changed. When the inlet water temperature of the spiral tube condenser increases from 25.2 C to 63 C, the total heat transfer coefficient decreases. The total heat transfer coefficient increases from 1184.12 W / (m2 K) to 1643.21 W / (m2 K), the suction pressure rises from 0.34 MPa to 0.38 MPa, the exhaust pressure rises from 0.77 MPa to 2.00 MPa, the input power rises from 1040 W to 2100 W, the thermal performance coefficient COP decreases from 4.4 to 1.2, and the heat production decreases from 1387.83 W to 667.14 W. W. (2) When the inlet water temperature of the condenser is constant, the total heat transfer capacity and total heat transfer coefficient of the condenser increase with the increase of the inlet water flow rate, while the suction, exhaust pressure and input power of the compressor decrease. The heat production and heating coefficient of the heat pump system increase with the increase of the inlet water flow rate. When the inlet flow rate of the spiral tube condenser increases from 1.19 m3/h to 2.16 m3/h, the total heat transfer capacity of the condenser increases from 4025.72 W to 7565.71 W, the total heat transfer coefficient increases from 1472.03 W /(m2.K) to 3956.29 W /(m2.K), the suction pressure decreases from 0.36 MPa to 0.35 MPa, the exhaust pressure decreases from 1.38 MPa to 1.27 MPa, and the system input power decreases from 1488.67 W to 1 956.29 W /(m2.K). At 1423.75W, the COP of the system increases from 2.5 to 3.0, and the heat of the system increases from 986.90W to 1087.06W. (3) When the inlet water temperature of the condenser is constant, the total heat transfer capacity and the total heat transfer coefficient of the spiral sleeve condenser increase with the increase of the inlet water flow rate. When the inlet water temperature is kept at 22 C and the inlet water flow rate of the spiral tube condenser increases from 0.26 m3/h to 0.71 m3/h, the total heat transfer capacity of the spiral tube condenser increases from 3614.24 W to 4165.96 W, the total heat transfer coefficient increases from 1999.03 W /(m2.K) to 2835.92 W /(m2.K), and the suction pressure of the compressor increases from 0.32 MP. A decreases to 0.30 MPa, the exhaust pressure decreases from 0.84 MPa to 0.62 MPa, and the input power of the system decreases from 1040 W to 920 W. In this paper, the heat transfer performance of the spiral tube condenser and the operation performance of the heat pump are studied experimentally and theoretically. The research is expected to provide reference for optimum design of heat exchanger and energy-saving operation of heat pump water heater in refrigerant substitution.
【學(xué)位授予單位】：西安科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TU822

【相似文獻(xiàn)】

相關(guān)期刊論文 前10條

1 魏耀東,魏奇業(yè),韓光澤,華賁;多效蒸發(fā)器換熱管的換熱性能和機(jī)械強(qiáng)度分析[J];華北電力大學(xué)學(xué)報(bào);2003年05期

2 張寅平;非接觸式汽液固系統(tǒng)儲(chǔ)換熱性能的實(shí)驗(yàn)研究[J];太陽能學(xué)報(bào);1998年04期

3 連添達(dá);靜止密閉空氣在降溫過程中換熱性能的測定研究[J];天津商學(xué)院學(xué)報(bào);1991年03期

4 劉召軍;謝旭良;李增耀;屈治國;陶文銓;;熱管型散熱器換熱性能的實(shí)驗(yàn)研究及數(shù)值模擬[J];工程熱物理學(xué)報(bào);2009年07期

5 程文龍;韓豐云;韋文靜;;單相流體通過多孔金屬換熱器換熱性能的理論分析[J];化工學(xué)報(bào);2011年10期

6 蔣恩澤;強(qiáng)天偉;黃書峰;曹鵬華;;雙U型樁基埋管換熱性能模擬與研究[J];科技致富向?qū)?2012年35期

7 高桂芝;高俊明;;地源熱泵U形地埋管換熱性能及其影響因素分析[J];河北工程技術(shù)高等�？茖W(xué)校學(xué)報(bào);2013年01期

8 李青;劉金祥;陳曉春;徐穩(wěn)龍;丁高;潘云鋼;;U形毛細(xì)管席冷卻頂板換熱性能數(shù)值模擬與分析[J];暖通空調(diào);2010年04期

9 張東生;杜揚(yáng);陳思維;;管殼式換熱器換熱性能的數(shù)值模擬研究[J];節(jié)能技術(shù);2006年05期

10 鄭榮波;劉剛;劉自華;;兩相閉式熱虹吸管的幾何尺寸對其換熱性能的影響研究[J];制冷;2009年02期

相關(guān)會(huì)議論文 前10條

1 岳麗燕;韓再生;;含水層對垂直地埋管換熱性能影響分析[A];第十三屆中國科協(xié)年會(huì)第14分會(huì)場-地?zé)崮荛_發(fā)利用與低碳經(jīng)濟(jì)研討會(huì)論文集[C];2011年

2 吳祥生;楊嘉;黃金強(qiáng);信海;;重慶市某高校綠色建筑示范樓地?zé)崮軗Q熱性能測試及分析[A];全國暖通空調(diào)制冷2010年學(xué)術(shù)年會(huì)資料集[C];2010年

3 章曉龍;李征濤;;潤滑油對制冷系統(tǒng)換熱性能影響的研究進(jìn)展[A];上海市制冷學(xué)會(huì)2013年學(xué)術(shù)年會(huì)論文集[C];2013年

4 史學(xué)增;王偉勇;張定才;;船用冷凝器冷凝強(qiáng)化管換熱性能研究[A];上海市制冷學(xué)會(huì)2007年學(xué)術(shù)年會(huì)論文集[C];2007年

5 楊敏;陳穎;史保新;;廣州與兩類地區(qū)埋地?fù)Q熱器換熱性能的比較[A];中國制冷學(xué)會(huì)2007學(xué)術(shù)年會(huì)論文集[C];2007年

6 朱賀;張永存;劉書田;;開孔金屬泡沫換熱性能表征方法研究[A];中國力學(xué)學(xué)會(huì)學(xué)術(shù)大會(huì)'2009論文摘要集[C];2009年

7 李魁山;張旭;高軍;劉俊;;樁基式土壤源熱泵換熱器換熱性能及土壤溫升研究[A];中國制冷學(xué)會(huì)2007學(xué)術(shù)年會(huì)論文集[C];2007年

8 張銳;張旭;周翔;董麗娟;唐凱;;流量對地埋管換熱性能影響的實(shí)驗(yàn)研究[A];走中國創(chuàng)造之路——2011中國制冷學(xué)會(huì)學(xué)術(shù)年會(huì)論文集[C];2011年

9 劉艷艷;王巍;;場協(xié)同理論監(jiān)測主表面式回?zé)崞鞯膿Q熱性能[A];2008年全國振動(dòng)工程及應(yīng)用學(xué)術(shù)會(huì)議暨第十一屆全國設(shè)備故障診斷學(xué)術(shù)會(huì)議論文集[C];2008年

10 高彥明;羅行;Stephan Kabelac;;蒸發(fā)器在熱虹吸系統(tǒng)中的阻力壓降與換熱性能的數(shù)學(xué)建模與分析[A];中國化工學(xué)會(huì)2009年年會(huì)暨第三屆全國石油和化工行業(yè)節(jié)能節(jié)水減排技術(shù)論壇會(huì)議論文集（上）[C];2009年

相關(guān)碩士學(xué)位論文 前10條

1 姚麗華;熱源塔換熱性能研究與應(yīng)用[D];南京師范大學(xué);2015年

2 李豪;基于有機(jī)朗肯循環(huán)余熱回收系統(tǒng)的換熱器結(jié)構(gòu)數(shù)值研究[D];華北電力大學(xué);2015年

3 袁博;內(nèi)插螺旋翅片式EGR冷卻器結(jié)構(gòu)及流動(dòng)傳熱性能研究[D];浙江大學(xué);2016年

4 白崇儼;小通道蒸發(fā)器熱虹吸循環(huán)換熱性能的研究[D];浙江大學(xué);2016年

5 洪珊瑚;R134a在螺旋套管冷凝器中的換熱性能實(shí)驗(yàn)研究[D];西安科技大學(xué);2015年

6 張e，

本文編號(hào)：2247200