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Numerical study on performance of a hybrid indirect evaporative cooling heat recovery heat pump ventilator as applied in different climatic regions of China

Indirect evaporative cooling (IEC) and heat recovery are key technologies for decarbonising heating, ventilation, and air-conditioning (HVAC) while their performance is affected by the ambient environment. This paper presents a numerical investigation of a recently developed hybrid ventilator integr...

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Published in:Energy (Oxford) 2022-01, Vol.239, p.122431, Article 122431
Main Authors: Wang, Jue, Lu, Jun, Li, Wuyan, Zeng, Cheng, Shi, Fenghao
Format: Article
Language:English
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Summary:Indirect evaporative cooling (IEC) and heat recovery are key technologies for decarbonising heating, ventilation, and air-conditioning (HVAC) while their performance is affected by the ambient environment. This paper presents a numerical investigation of a recently developed hybrid ventilator integrating the IEC and heat recovery. A TRNSYS-Matlab model was used to evaluate the ventilator's adaptability (operational and energy performance) in a public building at five typical cities in China. According to the validated model analysis, the ventilator shows a superior adaptability to the temperate region, with the lowest annual energy use at 96.70 kWh/m2 and the minimum energy input of the auxiliary source at 39.29% of the total energy use. The hybrid ventilator's adaptability is followed by the hot summer cold winter region and cold region where the ventilator covers 85% of the total heating/cooling loads in transition seasons. The severe cold region and hot summer warm winter region requires a significant auxiliary energy use for the stable indoor air parameters, which consumes 70.64% and 60.1% of the annual energy use, respectively. Future works are to improve the performance of the IEC and heat pump unit in the two climatic regions for better adaptability of the ventilator. •Numerically investigate the climatic adaptability of a hybrid ventilator in China.•The ventilator can process fresh air efficiently in the varying climatic regions.•The ventilator's monthly average EER can reach 5.6 in cold regions.•The adaptability should not be evaluated only by EER alone.•Suggestions are given to achieve better ventilator performance.
ISSN:0360-5442
1873-6785
DOI:10.1016/j.energy.2021.122431