Theoretical and Experimental Investigation on R245fa High-temperature Water Steam Heat Pump System

Zhao Zhaorui; Wu Huagen; Xing Ziwen; Yu Zhiqiang

doi:10.3969/j.issn.0253-4339.2018.01.028

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Theoretical and Experimental Investigation on R245fa High-temperature Water Steam Heat Pump System

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- Theoretical and Experimental Investigation on R245fa High-temperature Water Steam Heat Pump System
- Journal of Refrigeration Vol. 39, Issue 1, (2018)
- 作者机构：
  
  1. 西安交通大学能源与动力工程学院
  2. 烟台冰轮股份有限公司
- 作者简介：
- 基金信息：
- DOI：10.3969/j.issn.0253-4339.2018.01.028
  CLC：
- Published：2018
- 稿件说明：
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Zhao Zhaorui, Wu Huagen, Xing Ziwen, et al. Theoretical and Experimental Investigation on R245fa High-temperature Water Steam Heat Pump System[J]. Journal of refrigeration, 2018, 39(1).
DOI：

Zhao Zhaorui, Wu Huagen, Xing Ziwen, et al. Theoretical and Experimental Investigation on R245fa High-temperature Water Steam Heat Pump System[J]. Journal of refrigeration, 2018, 39(1). DOI： 10.3969/j.issn.0253-4339.2018.01.028.

摘要

工业领域中高温蒸气的需求较大，由于小型锅炉的禁用、电锅炉的低能效及余热资源的浪费，因此高温热泵作为制取水蒸气的装置，有广阔的发展前景。本文设计了一种采用R245fa为工质的高温热泵系统与水蒸气制备装置，建立数学模型对系统及各部件进行模拟和性能预测，并搭建实验台研究其性能和运行参数随工况等的变化规律。结果表明：随着蒸发温度的上升，系统COP快速上升，相对值为0.55~1.3，上升速度逐渐减缓，制热量近似线性升高，排气过热度下降，换热温差显著上升；换热系数随着水流率的增加而增加，变化范围为1.7~2.8 kW/(m2?K)。

Abstract

High-temperature steam is in great demand for many industrial applications. The electric boilers used to replace traditional boilers in rural areas are not efficient enough to be employed in large-scale steam production. Furthermore

a large amount of heat appears to be wasted in related industries

so the employment of high-temperature heat pumps is quite promising in producing high-temperature steam. In this paper

an R245fa high-temperature heat pump system is applied to the production of steam. A mathematical model is developed to predict the performance of each component and the heat pump system

and an experimental investigation is also conducted. The results illustrate that

with an increase in evaporation temperature

the coefficient of performance (COP) and heat capacity increase

whereas the discharge temperature decreases. The relative COP ranges from 0.55 to 1.3 in the target operating conditions. The heat exchange efficiency is observed to increase from 1.7 to a maximum of 2.8 kW/(m2?K) as the water flow rate increases.

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