Effect of heat generated by outdoor condensing unit of air- conditioning system towards the surrounding environment: a case study using green leaves plants

Wai, Koon Low and Ling, Yong Wong and Chuan, Meng Goh and Kah, Hon Leong and Chung, Wei Khew and Lai, Peng Wong (2023) Effect of heat generated by outdoor condensing unit of air- conditioning system towards the surrounding environment: a case study using green leaves plants. International Journal of Agriculture, Forestry and Plantation (Malaysia), 13. pp. 115-122. ISSN 2462-1757

Air-conditioning systems work by transferring heat from indoor spaces to the outdoors and thus the generation of hot air by air-conditioning systems can indeed complicate energy efficiency, and the substantial amount of heat released from these systems can contribute to the aggravation of the global warming effect. The first objective of this study was to investigate the effect of heat generated by outdoor condensing units of air-conditioning systems on the surrounding environment. The second objective of the study was to investigate the reduction of carbon footprints by comparing the heat generated by the two different brands of outdoor condensing units (i: Evoair and ii: Control). By conducting such a study and disseminating its findings, this paper contributes to proposing a better environmentally friendly air-conditioning system for supporting Environmental, Social, and Governance (ESG) initiatives and working towards mitigating the global warming effect. In order to accurately measure the temperature increase in the vicinity of outdoor condensing units during operation, three different types of green leaf crops (Brassica rapa subsp. chinensis, Brassica oleracea var. alboglabra and Ocimum basilicum) were selected to measure the change in microclimate effects. These crops were cultivated in two separate greenhouses receiving exhaust from two different outdoor condensing units for 9 hours/day for a duration of 55 days. The evaluation factors included seed germination rate (%), crop survival rate (%), plant height, number of leaves and dimension of leaves. In conclusion, this study concluded that the air produced by Evoair’s outdoor condensing unit, which is lower in temperature is more environmentally friendly and favourable for the growth of green plants compared to the hot air produced by Control’s outdoor condensing unit.

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Abstract

Air-conditioning systems work by transferring heat from indoor spaces to the outdoors and thus the generation of hot air by air-conditioning systems can indeed complicate energy efficiency, and the substantial amount of heat released from these systems can contribute to the aggravation of the global warming effect. The first objective of this study was to investigate the effect of heat generated by outdoor condensing units of air-conditioning systems on the surrounding environment. The second objective of the study was to investigate the reduction of carbon footprints by comparing the heat generated by the two different brands of outdoor condensing units (i: Evoair and ii: Control). By conducting such a study and disseminating its findings, this paper contributes to proposing a better environmentally friendly air-conditioning system for supporting Environmental, Social, and Governance (ESG) initiatives and working towards mitigating the global warming effect. In order to accurately measure the temperature increase in the vicinity of outdoor condensing units during operation, three different types of green leaf crops (Brassica rapa subsp. chinensis, Brassica oleracea var. alboglabra and Ocimum basilicum) were selected to measure the change in microclimate effects. These crops were cultivated in two separate greenhouses receiving exhaust from two different outdoor condensing units for 9 hours/day for a duration of 55 days. The evaluation factors included seed germination rate (%), crop survival rate (%), plant height, number of leaves and dimension of leaves. In conclusion, this study concluded that the air produced by Evoair’s outdoor condensing unit, which is lower in temperature is more environmentally friendly and favourable for the growth of green plants compared to the hot air produced by Control’s outdoor condensing unit.

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Item Type:	Article
AGROVOC Term:	air conditioning
AGROVOC Term:	plant growth
AGROVOC Term:	hot air drying
AGROVOC Term:	microclimate
AGROVOC Term:	global warming
AGROVOC Term:	seed germination
AGROVOC Term:	plant height
Geographical Term:	Malaysia
Depositing User:	Mr. Khoirul Asrimi Md Nor
Date Deposited:	10 Jun 2026 12:33
Last Modified:	10 Jun 2026 12:33
URI:	http://webagris.upm.edu.my/id/eprint/3994

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