制冷与空调(四川)
製冷與空調(四川)
제랭여공조(사천)
REFRIGERATION & AIR-CONDITION
2015年
4期
363-367
,共5页
王杰%胡云鹏%陈焕新%李冠男%黎浩荣%胡文举
王傑%鬍雲鵬%陳煥新%李冠男%黎浩榮%鬍文舉
왕걸%호운붕%진환신%리관남%려호영%호문거
热泵热水系统%板式冷凝器%换热特性%模拟计算
熱泵熱水繫統%闆式冷凝器%換熱特性%模擬計算
열빙열수계통%판식냉응기%환열특성%모의계산
heat pump hot water system%plate condenser%heat transfer characteristics%simulation calculation
针对板式冷凝器,建立了稳态分布参数数学模型,编写了模拟计算程序,对比模拟计算值与文献的实验值,具有较好的一致性。基于此模型模拟了板式冷凝器中R134a制冷剂以及冷却水的温度沿板长的变化情况,根据模型计算结果,分析了板式冷凝器的换热特性。从计算可知两相区换热量约占总换热量的75%,增大两相区长度有助于提高换热效率。制冷剂质量流量变化对换热量影响较大,流量增大2.76%时候换热量提升约为3.45%,但是增加的趋势逐渐减小;同时对制冷剂出口温度影响较大,流量增大9.37%时制冷剂出口温度上升了4℃。为热泵热水系统中板式换热器的优化设计和系统仿真提供了一定指导。
針對闆式冷凝器,建立瞭穩態分佈參數數學模型,編寫瞭模擬計算程序,對比模擬計算值與文獻的實驗值,具有較好的一緻性。基于此模型模擬瞭闆式冷凝器中R134a製冷劑以及冷卻水的溫度沿闆長的變化情況,根據模型計算結果,分析瞭闆式冷凝器的換熱特性。從計算可知兩相區換熱量約佔總換熱量的75%,增大兩相區長度有助于提高換熱效率。製冷劑質量流量變化對換熱量影響較大,流量增大2.76%時候換熱量提升約為3.45%,但是增加的趨勢逐漸減小;同時對製冷劑齣口溫度影響較大,流量增大9.37%時製冷劑齣口溫度上升瞭4℃。為熱泵熱水繫統中闆式換熱器的優化設計和繫統倣真提供瞭一定指導。
침대판식냉응기,건립료은태분포삼수수학모형,편사료모의계산정서,대비모의계산치여문헌적실험치,구유교호적일치성。기우차모형모의료판식냉응기중R134a제랭제이급냉각수적온도연판장적변화정황,근거모형계산결과,분석료판식냉응기적환열특성。종계산가지량상구환열량약점총환열량적75%,증대량상구장도유조우제고환열효솔。제랭제질량류량변화대환열량영향교대,류량증대2.76%시후환열량제승약위3.45%,단시증가적추세축점감소;동시대제랭제출구온도영향교대,류량증대9.37%시제랭제출구온도상승료4℃。위열빙열수계통중판식환열기적우화설계화계통방진제공료일정지도。
A distributed parameter mathematical model was established for a plate condenser under steady state. Simulation program of the plate condenser was written with the computer language showed that good consistency of the model. Based on the model, the characteristics of the flow and heat transfer of R134a and cooling water in the plate condenser were simulated. According to the calculation, the heat volume of the two phase is about 75% of total and increasing the length of the two-phase region can help improve heat transfer efficiency. The mass flow rate of the refrigerant have great effect on heat transfer,the heat volume improve up to 3.45% with the mass flow rate increases by 2.75%, but the trend of increasing gradually decreases. Also the effect to the outlet temperature of the refrigerant is great, the temperature improve up to 4℃ with the mass flow rate increases by 9.37%. The model could provide theoretical basis for the optimization design and system simulation.