【摘要】：在空氣源熱泵熱水器中,對(duì)水平套管冷凝器環(huán)形通道內(nèi)R134a的凝結(jié)換熱特性進(jìn)行實(shí)驗(yàn)研究。在冷凝器不同進(jìn)水流量、進(jìn)水溫度時(shí),實(shí)驗(yàn)測(cè)試了水平套管冷凝器凝結(jié)換熱系數(shù)隨熱流密度、冷凝壓力及干度的變化。實(shí)驗(yàn)工況為:冷凝器的進(jìn)水流量為0.6~1.0 m~3/h,進(jìn)水溫度為15~60℃。實(shí)驗(yàn)結(jié)果表明:水平環(huán)形通道內(nèi)R134a的凝結(jié)換熱系數(shù)隨熱流密度和冷凝壓力(溫度)的升高而減小,當(dāng)冷凝壓力為1.3 MPa,熱流密度由18 k W/m2增加至20.5 k W/m~2時(shí),R134a的凝結(jié)換熱系數(shù)減小了6.9%;當(dāng)熱流密度為15 k W/m~2,冷凝壓力由1.78 MPa增大至1.83 MPa時(shí),R134a的凝結(jié)換熱系數(shù)減小了5.8%。R134a的局部凝結(jié)換熱系數(shù)隨干度的增大而增大,當(dāng)冷凝壓力為1.1 MPa,熱流密度為18.3 k W/m~2,制冷劑干度由0.1增大至0.9時(shí),R134a的局部凝結(jié)換熱系數(shù)增大了24.4%。
[Abstract]:The condensation heat transfer characteristics of R134a in the annular passage of horizontal casing condenser are studied experimentally in the air source heat pump water heater. The change of condensation heat transfer coefficient with heat flux, condensation pressure and dryness of horizontal casing condenser was tested at different influent flow rate and influent temperature. The experimental conditions are as follows: the influent flow rate of the condenser is 0.61.0 mg / h, and the influent temperature is 1560 鈩，

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