Energy Efficiency Evaluation of Residential Fresh Air Units with Exhaust Air Heat Recovery

Cheng Jiahao; Zhang Chunlu

doi:10.12465/j.issn.0253-4339.2025.05.124

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Energy Efficiency Evaluation of Residential Fresh Air Units with Exhaust Air Heat Recovery

更新时间：2025-09-29

- Energy Efficiency Evaluation of Residential Fresh Air Units with Exhaust Air Heat Recovery
- Journal of Refrigeration Vol. 46, Issue 5, Pages: 124-132(2025)
- 作者机构：
  
  1.同济大学机械工程博士后工作站　上海　201804
  2.同济大学机械与能源工程学院　制冷与低温工程研究所　上海　201804
- 作者简介：
  
  Zhang Chunlu, male, professor, director, Institute of Refrigeration and Cryogenics, School of Mechanical Engineering, Tongji University, 86-21-69589750, E-mail: chunlu.zhang@gmail.com. Research fields: refrigeration and heat pump system modeling, optimization and control.
- 基金信息：
- DOI：10.12465/j.issn.0253-4339.2025.05.124
  CLC： TB61⁺1;TU83
- Received：28 May 2024，
  
  Revised：2024-07-15，
  
  Accepted：30 August 2024，
  
  Published：16 October 2025
- 稿件说明：
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Cheng Jiahao, Zhang Chunlu. Energy Efficiency Evaluation of Residential Fresh Air Units with Exhaust Air Heat Recovery[J]. Journal of refrigeration, 2025, 46(5): 124-132.
DOI：

Cheng Jiahao, Zhang Chunlu. Energy Efficiency Evaluation of Residential Fresh Air Units with Exhaust Air Heat Recovery[J]. Journal of refrigeration, 2025, 46(5): 124-132. DOI： 10.12465/j.issn.0253-4339.2025.05.124.

摘要

新风对改善住宅内空气质量至关重要，但也增大了建筑空调能耗。住宅宜采用排风热回收型的节能新风机组，包括被动式和主动式2种类型，典型代表分别为全热交换器和热泵热回收型机组。当前对新风机组的能效评价体系仍主要围绕全热交换器构建，其常用的热交换效率并不适用于热泵主动热回收机制，且排风热回收的概念存在混淆和冲突。此外，现有评价一般局限于新风机组个体表现，未考虑其对空调机组的潜在影响，以及二者协作后的整体效能。文章力图明晰新风机组排风热回收的界定，消除概念混乱，同时提出联合空调系统的综合能效评价方法。针对7类现有新风机组的实例分析，验证了采用排风热回收技术的必要性，并对比了不同类型机组的能效水平。

Abstract

Improving indoor air quality in homes requires fresh air; however

this is a strain on air conditioning systems. To address this issue

the use of energy-efficient fresh air units equipped with exhaust air heat recovery is recommended. These units include both passive and active types

with prominent examples being air-to-air enthalpy heat exchangers and heat pump units. Currently

the evaluation of the energy efficiency in fresh air units predominantly revolves around air-to-air enthalpy heat exchangers

rendering the commonly used heat exchange efficiency inapplicable to heat pump units. The concept of exhaust air heat recovery is perplexing and contradictory. Furthermore

the assessment of fresh air units primarily focuses on the units themselves

without considering their impact on air conditioning units and the overall system performance once combined. This study aims to establish a unified definition of exhaust air heat recovery for fresh air units

elucidating its intrinsic meaning. Additionally

it proposes a comprehensive energy efficiency evaluation method for a combined fresh air and air conditioning system. Through a case study of seven existing fresh air unit types

the necessity of exhaust air heat recovery is highlighted

and the energy efficiency levels of different unit types are compared.

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references

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