制冷学报
製冷學報
제랭학보
JOURNAL OF REFRIGERATION
2010年
1期
54-58
,共5页
热工学%重力供液蒸发器%循环倍率%传热特性%热平衡
熱工學%重力供液蒸髮器%循環倍率%傳熱特性%熱平衡
열공학%중력공액증발기%순배배솔%전열특성%열평형
Pyrology%Evaporator with supplying liquid refrigerant by gravity%Circulating ration%Heat transfer characteristics%Thermal balance
采用R404A作为制冷剂对重力供液蒸发器在低温工况下的特性进行实验研究,建立重力供液蒸发器的传热模型,搭建重力供液蒸发器的实验装置,用热平衡法测试重力供液蒸发器在不同蒸发器供液高度下的运行特性.研究表明:供液压头在h1=1200mm时比供液压头在h1=800mm、h1=1000mm时的传热温差明显下降,且随着室内温度的下降,传热温差随之变小;在同一供液高度下,重力供液蒸发器的循环倍率n随蒸发温度的降低而增大,而在不同供液高度下,循环倍率n随供液高度的升高而增大;重力供液蒸发器在供液高度h_1=1000mm时的制冷量明显高于h_1=800mm时的制冷量,其最大增幅为16.9%;而h_1=1200mm时其制冷量与h_1=1000mm很接近,甚至会有所下降;与h1=800mm相比,h_1=1000mm时重力供液制冷系统COP大幅度增加,最大增幅为17%,h_1=1200mm时系统COP介于前两者之间,重力供液制冷系统存在最佳的蒸发器供液高度.
採用R404A作為製冷劑對重力供液蒸髮器在低溫工況下的特性進行實驗研究,建立重力供液蒸髮器的傳熱模型,搭建重力供液蒸髮器的實驗裝置,用熱平衡法測試重力供液蒸髮器在不同蒸髮器供液高度下的運行特性.研究錶明:供液壓頭在h1=1200mm時比供液壓頭在h1=800mm、h1=1000mm時的傳熱溫差明顯下降,且隨著室內溫度的下降,傳熱溫差隨之變小;在同一供液高度下,重力供液蒸髮器的循環倍率n隨蒸髮溫度的降低而增大,而在不同供液高度下,循環倍率n隨供液高度的升高而增大;重力供液蒸髮器在供液高度h_1=1000mm時的製冷量明顯高于h_1=800mm時的製冷量,其最大增幅為16.9%;而h_1=1200mm時其製冷量與h_1=1000mm很接近,甚至會有所下降;與h1=800mm相比,h_1=1000mm時重力供液製冷繫統COP大幅度增加,最大增幅為17%,h_1=1200mm時繫統COP介于前兩者之間,重力供液製冷繫統存在最佳的蒸髮器供液高度.
채용R404A작위제랭제대중력공액증발기재저온공황하적특성진행실험연구,건립중력공액증발기적전열모형,탑건중력공액증발기적실험장치,용열평형법측시중력공액증발기재불동증발기공액고도하적운행특성.연구표명:공액압두재h1=1200mm시비공액압두재h1=800mm、h1=1000mm시적전열온차명현하강,차수착실내온도적하강,전열온차수지변소;재동일공액고도하,중력공액증발기적순배배솔n수증발온도적강저이증대,이재불동공액고도하,순배배솔n수공액고도적승고이증대;중력공액증발기재공액고도h_1=1000mm시적제랭량명현고우h_1=800mm시적제랭량,기최대증폭위16.9%;이h_1=1200mm시기제랭량여h_1=1000mm흔접근,심지회유소하강;여h1=800mm상비,h_1=1000mm시중력공액제랭계통COP대폭도증가,최대증폭위17%,h_1=1200mm시계통COP개우전량자지간,중력공액제랭계통존재최가적증발기공액고도.
The characteristics of an evaporator using R404A with liquid refrigerant supply by gravity were investigated at lower temperature.A heat transfer model of an evaporator with liquid refi'igerant supply by gravity was established.The experiment was conducted using the thermal balance method to obtain the operation characteristics of an evaporator with liquid refrigerant supply by gravity in different supply height.The results indicate that the logarithmic temperature difference between the evaporator and the indoor temperature was lowest when the supplying height h_1=12OOmm and decreased with the decrease in the indoor temperature.For the same supplying height,the circulating ratio of the evaporator increased with the decrease in the evaporation temperature.For the different supplying height,the circulating ratio of the evaporator increased with the increase in the supplying height.The refrigerating capacity when h_1=1000mm was up to 16.9% higher than that when h_1=80Omm.The refrigerating capacity when h_1=1000mm was very close to that when h_1=120Omm.The COP of the system when h_1=100Omm was up to 17% higher than that when h_1=800mm.It seems that there is an optimum supplying height for the evaporator with liquid refrigerant supply by gravity.
