国产日本精品,美女久久久精品,日韩av资源网,婷婷中文字幕一区

摘  要  對結(jié)霜工況下空氣源熱泵系統(tǒng)動態(tài)性能進(jìn)行了數(shù)值模擬和實(shí)驗研究， 分析比較了不同結(jié)霜工況條件下空氣源熱泵空
調(diào)器的動態(tài)性能、循環(huán)參數(shù)、蒸發(fā)器結(jié)霜量及結(jié)霜厚度。實(shí)驗數(shù)據(jù)與數(shù)值預(yù)測結(jié)果的比較表明，在結(jié)霜循環(huán)后期，蒸發(fā)器表
面霜層厚度快速生長，數(shù)值模擬結(jié)果與實(shí)驗結(jié)果的變化趨勢是一致的。熱泵系統(tǒng)動態(tài)性能及循環(huán)參數(shù)的數(shù)值模擬與實(shí)驗結(jié)果
在霜層勻速生長段符合度較好，驗證了數(shù)值模擬的合理性。而在結(jié)霜循環(huán)后期，霜層快速生長，熱泵機(jī)組性能數(shù)值模擬結(jié)果
出現(xiàn)了較大誤差，其主要原因是，在霜層生長模型中未考慮霜晶形態(tài)變化的影響。
關(guān)鍵詞  空氣源熱泵  結(jié)霜工況  數(shù)值模擬
 
NUMERICAL SIMULATION AND EXPERIMENTAL VERIFICATION  
ON FROSTING CONDITION PERFORMANCE OF AIR SOURCE HEAT
PUMP
Zhao Yang   Guo Xianmin   Wang Chengsheng
 
(Tianjin University of Commerce, Tianjin Key Laboratory of Refrigeration Technology, Tianjin 300134)
Abstract   The dynamic performances of an air source heat pump (ASHP) system under frosting conditions were
simulated. A series of experiments were conducted to verify the present simulation model. The dynamic performance
and cycle parameters of the ASHP system under frosting conditions, the frost thickness and the frost mass accumulation
on the outdoor coils were analyzed and compared. The comparison between the experimental and simulated results
indicates that the frost thickness on the surface of evaporator grows rapidly at the end of the frosting cycle. And the
simulated frost thickness is agreement with the experimental data. The simulated results and cycle parameters of the
dynamic performances are compared favorably with the experimental data at the second frosting stage. The numerical
simulation is verified to be reasonable. With the rapid growth of the frost thickness at the end of the frosting cycle,
numerical simulation of the ASHP results in a larger error which is because of the change of frosting shape which is not
taken into account in the simulation model.
Keywords    Air source heat pump    Frosting condition    Numerical simulation