A novel Temperature–Humidity–Time defrosting control method based on a frosting map for air-source heat pumps
A novel Temperature–Humidity–Time defrosting control method based on a frosting map for air-source heat pumps
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DOI：
10.1016/j.ijrefrig.2015.02.005
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发表时间：
2015-06
期刊：
影响因子：
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通讯作者：
Jiahe Zhu;Yuying Sun;W. Wang;Y. Ge;Lintao Li;Jingdong Liu
中科院分区：
文献类型：
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作者：
Jiahe Zhu;Yuying Sun;W. Wang;Y. Ge;Lintao Li;Jingdong Liu
为了提高空气源热泵（ASHP）在结霜和除霜条件下的除霜精度和能量效率，本文提出了一种基于空气源热泵机组结霜图的温度-湿度-时间（T-H-T）除霜控制方法。通过两个采暖季的现场试验，验证了T-H-T方法的可行性和适用性。与传统的温度-时间（T-T）除霜控制方法相比，T-H-T 方法的优点被介绍。本文总共展示了八个案例。选择案例 1 至 4 来揭示不同结霜条件下的 T-H-T 性能。结果发现，无论何种结霜条件，除霜总是在相似的情况下启动：约90%的室外盘管表面被霜覆盖；压缩机吸气和排气温差增加~20%；制热能力下降约30%。这些结果表明，T-H-T方法可以在不同的结霜条件下做出准确的决策。案例5a、5b和案例6a、6b是两组案例，比较T-H-T方法与传统T-T方法的优点。案例 5a 和 5b 选择用于无霜条件。结果发现，T-T 方法在 24 小时内启动了 31 次除霜操作。然而，T-H-T 方法没有进行任何除霜操作。选择案例 6a 和 6b 来比较这两种方法在连续和可变结霜条件下的情况。对于 T-T 方法，发现 63% 的除霜过程是在不需要除霜的条件下执行的。然而，对于 T-H-T 方法，所有除霜控制均被证明是准确且合理的。这些结果表明，新颖的T-H-T方法适用于ASHP的除霜控制，并且比传统的T-T方法具有更具竞争力的性能。
To improve the defrosting accuracy and the energy efficiency of the air-source heat pump (ASHP) under frosting and defrosting conditions, a novel Temperature–Humidity–Time (T–H–T) defrosting control method, based on a frosting map for the ASHP unit, is proposed in this paper. A field test was conducted for two heating seasons, to verify the feasibility and applicability of the T–H–T method. The advantages of the T–H–T method, compared to the conventional Temperature–Time (T–T) defrosting control method, are presented. In total, eight cases are shown in this paper. Cases 1 to 4 were chosen to reveal the T–H–T performance under different frosting conditions. It was found that no matter what kind of frosting conditions, defrosting was always initiated in a similar situation: ∼90% of the outdoor coil surface was covered by frost; the temperature difference between the compressor suction and discharge increased by ∼20%; and the heating capacity decreased by ∼30%. These results indicate that the T–H–T method can make an accurate decision under different frosting conditions. Cases 5a, 5b and Cases 6a, 6b were two groups of cases to compare the advantages of the T–H–T method against the conventional T–T method. Cases 5a and 5b were chosen for the non-frosting condition. It was found that the T–T method initiated the defrosting operation 31 times within 24 h. However, none of the defrosting operations was conducted for the T–H–T method. Cases 6a and 6b were chosen to compare these two methods under consecutive and variable frosting conditions. For the T–T method, 63% of the defrosting processes were found to be executed under conditions where defrosting was not necessary. However, for the T–H–T method, all the defrosting controls were found to be accurate and reasonable. These results indicated that the novel T–H–T method is suitable for the defrosting control of the ASHP, and has a more competitive performance than the conventional T–T method.