热泵干燥过程中低温热泵补热的应用分析

doi:10.11949/j.issn.0438-1157.20171125

化工学报 ›› 2018, Vol. 69 ›› Issue (5): 2032-2039.DOI: 10.11949/j.issn.0438-1157.20171125

热泵干燥过程中低温热泵补热的应用分析

周鹏飞^1,2, 张振涛¹, 章学来², 杨鲁伟¹, 魏娟¹, 刘鹏鹏¹

1. 中国科学院理化技术研究所, 北京 100190;
2. 上海海事大学蓄冷技术研究所, 上海 201306

收稿日期:2017-08-18 修回日期:2017-10-10 出版日期:2018-05-05 发布日期:2018-05-05
通讯作者: 张振涛
基金资助:
国家科技支撑计划项目（2015BADB02）。

Application analysis of low temperature heat pump heating during heat pump drying

ZHOU Pengfei^1,2, ZHANG Zhentao¹, ZHANG Xuelai², YANG Luwei¹, WEI Juan¹, LIU Pengpeng¹

1. Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100084, China;
2. Institute of Cooling Energy Storage Technology, Shanghai Maritime University, Shanghai 201306, China

Received:2017-08-18 Revised:2017-10-10 Online:2018-05-05 Published:2018-05-05
Supported by:
supported by the National Key Technology Research and Development Program of the Ministry of Science and Technology of China (2015BADB02).

摘要/Abstract

摘要：

针对木材干燥中的不利工况，提高干燥系统的可靠性，根据两级压缩制冷循环原理，提出了低温热泵和干燥热泵的耦合应用方案。使用能量的（火用）损失模型，分别对干燥系统进行热量、干燥介质的质扩散和除湿过程的（火用）损失进行分析。在低温热泵20、22、24、26、28、30℃以及关闭低温热泵的供热情况下分别测试计算了干燥热泵压缩机的排气温度与能耗、热泵性能系数（COP）以及热力完善度，同时测得木材含水率下降1%，系统的干燥用时和能耗。结果表明：相比于关闭低温热泵，开启低温热泵后干燥热泵的排气温度最多减少了16℃，COP皆有所提高。由于主机室温度升高后，系统循环的不可逆程度增加，热力完善度随着供热温度增加逐渐降低。开启低温热泵后干燥热泵的供热量和用时比关闭低温热泵最大分别增加44%，减少46%。

关键词: 干燥, 热泵, (火用), 模型, COP, 热力完善度, 供热量

Abstract:

Pointing at the unfavorable conditions and improving the reliability of the drying system, a coupled application scheme of low-temperature heat pump(LTHP) and dry heat pump(DHP) is proposed, according to the principle of two stage compression refrigeration cycle. By using the exergy analysis model, the exergy loss of the heat, the mass diffusion of the drying medium and the dehumidification process were analyzed respectively to the drying system. With the LTHP at 20, 22, 24, 26, 28, 30℃ and closed, the experiment tests and calculates the exhaust temperature and energy consumption of the compressor of DHP, coefficient of performance and the thermodynamic perfect degrees. The drying time and energy consumption of the system were measured when the water content of wood was decreased by 1%, at different heating temperatures. The results show that:compared with shutting down the LTHP, the exhaust temperature of the drying heat pump is reduced by 16℃ at most, and all the performance coefficient of the heat pump is improved. By the increase of the temperature of the machine hall, the irreversibility of the system cycle increases, and the thermodynamic perfect degrees decreases gradually. After opening the LTHP, the maximum amount of heating load and the drying time of the DHP increases by 44% and decreases by 46%, respectively.

Key words: drying, heat pump, exergy, model, COP, thermodynamic perfect degrees, heating load

中图分类号:

TK173

周鹏飞, 张振涛, 章学来, 杨鲁伟, 魏娟, 刘鹏鹏. 热泵干燥过程中低温热泵补热的应用分析[J]. 化工学报, 2018, 69(5): 2032-2039.

ZHOU Pengfei, ZHANG Zhentao, ZHANG Xuelai, YANG Luwei, WEI Juan, LIU Pengpeng. Application analysis of low temperature heat pump heating during heat pump drying[J]. CIESC Journal, 2018, 69(5): 2032-2039.

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热泵干燥过程中低温热泵补热的应用分析

Application analysis of low temperature heat pump heating during heat pump drying

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