制冷与空调（四川）
製冷與空調（四川）
제랭여공조（사천）
REFRIGERATION & AIR-CONDITION
2014年
1期
95-101
,共7页
风冷热泵%多余制冷剂流量%热量利用率%除霜时间
風冷熱泵%多餘製冷劑流量%熱量利用率%除霜時間
풍랭열빙%다여제랭제류량%열량이용솔%제상시간
Air-source heat pump%Redundant refrigerant flux%Heat utilization ratio%Defrosting time
根据风冷热泵空调系统中制冷和制热两种工况下制冷剂流量的差别，将冬季多余的制冷剂流量应用于热气旁通除霜、显热除霜、制冷剂过冷放热除霜三种不同的除霜模式中。当制热循环与除霜循环同时进行时，分别计算了三种不同除霜方式的除霜热量利用率、除霜耗热率以及理论制热系数。当定时除霜时，分别计算了三种不同除霜模式的除霜时间。计算结果表明，在控制制冷剂流量的风冷热泵空调系统中，系统正常制热运行时，三种除霜模式都能够有效地抑制室外换热器表面的结霜，其中制冷剂过冷放热除霜法最佳，定时除霜时，显热除霜所用的除霜时间最少。
根據風冷熱泵空調繫統中製冷和製熱兩種工況下製冷劑流量的差彆，將鼕季多餘的製冷劑流量應用于熱氣徬通除霜、顯熱除霜、製冷劑過冷放熱除霜三種不同的除霜模式中。噹製熱循環與除霜循環同時進行時，分彆計算瞭三種不同除霜方式的除霜熱量利用率、除霜耗熱率以及理論製熱繫數。噹定時除霜時，分彆計算瞭三種不同除霜模式的除霜時間。計算結果錶明，在控製製冷劑流量的風冷熱泵空調繫統中，繫統正常製熱運行時，三種除霜模式都能夠有效地抑製室外換熱器錶麵的結霜，其中製冷劑過冷放熱除霜法最佳，定時除霜時，顯熱除霜所用的除霜時間最少。
근거풍랭열빙공조계통중제랭화제열량충공황하제랭제류량적차별，장동계다여적제랭제류량응용우열기방통제상、현열제상、제랭제과랭방열제상삼충불동적제상모식중。당제열순배여제상순배동시진행시，분별계산료삼충불동제상방식적제상열량이용솔、제상모열솔이급이론제열계수。당정시제상시，분별계산료삼충불동제상모식적제상시간。계산결과표명，재공제제랭제류량적풍랭열빙공조계통중，계통정상제열운행시，삼충제상모식도능구유효지억제실외환열기표면적결상，기중제랭제과랭방열제상법최가，정시제상시，현열제상소용적제상시간최소。
Based on the difference of refrigerant flux between refrigeration operating condition and heating operating condition in an air-source heat-pump air-conditioning system, the redundant refrigerant flux in winter was applied in three different heat-pump defrosting models including the hot gas bypass defrosting, the sensible heat defrosting and the heat output from refrigerant subcooling. When heating cycle and defrosting cycle took place simultaneously, the defrosting heat utilization ratio, defrosting heat consumption rate and theoretical heating coefficient of these three different defrosting models were calculated respectively. While defrosting at predetermined time, the defrosting time of them was calculated too. Calculating results show that three defrosting models can be used to restrain frosting on the surface of outdoor heat-exchanger effectively in the heating operating air-source heat-pump air-conditioning system with refrigerant flux control. And among them, the heat output from refrigerant subcooling is the best defrosting method. When defrosting at predetermined time, defrosting time of the sensible heat defrosting is the least.
