INFLUENCE OF ARRAY HEIGHT OF OPEN AREA AIR SOURCE HEAT PUMP ON COLD ISLAND EFFECT

Jiang Hua; Luo Xianrui; Gong Wuqi

doi:10.19912/j.0254-0096.tynxb.2023-1609

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Acta Energiae Solaris Sinica ›› 2025, Vol. 46 ›› Issue (2) : 309-316. DOI: 10.19912/j.0254-0096.tynxb.2023-1609

INFLUENCE OF ARRAY HEIGHT OF OPEN AREA AIR SOURCE HEAT PUMP ON COLD ISLAND EFFECT

Jiang Hua¹, Luo Xianrui¹, Gong Wuqi²

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Abstract

This study investigates the influence of different array heights on the cold island effect in unobstructed open environments through three-dimensional simulations of a 2×13 array. The results demonstrate that increasing the array height effectively mitigates the cold island effect by enhancing the inlet air temperature and its uniformity while reducing cold air reflux throughout the array. In windless conditions, each 0.5 m increase in array height leads to an average elevation of 0.14-0.18 K in the unit’s average inlet air temperature, coupled with an average reduction in the return rate by 0.018. At a wind speed of 0.5 m/s in the x direction, augmenting the array height by 0.5 m yields a maximum increment of 0.52 K in the average inlet air temperature across each row, accompanied by a 38% average decrease in the variance of the inlet air temperature and significant enhancement in temperature uniformity. The mean difference in reflux rates diminishes with increasing height, ranging from 0.21 to 0.42. Moreover, at a wind speed of 2 m/s in the xdirection, each 0.5 m increase in array height corresponds to an average rise of 0.16 K in the average inlet air temperature. Notably, for an array height of 2.5 m, the average inlet air temperature increases by 0.75 K on average, with a maximum surge of 1.1 K compared to an array without additional height.

Key words

air source heat pump / numerical simulation / ambient temperature / cold island effect / cold area

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Jiang Hua, Luo Xianrui, Gong Wuqi. INFLUENCE OF ARRAY HEIGHT OF OPEN AREA AIR SOURCE HEAT PUMP ON COLD ISLAND EFFECT[J]. Acta Energiae Solaris Sinica. 2025, 46(2): 309-316 https://doi.org/10.19912/j.0254-0096.tynxb.2023-1609

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