Performance enhancement of air conditioner in hot climate by condenser cooling with cool air generated by direct evaporative cooling
This research studied the direct evaporative cooling technique for generating cool air in hot–dry and hot–humid climates. For direct evaporative cooling, three parameters affected the air temperature: feedwater temperature, wet-bulb temperature, and mass ratio of feedwater to circulating air were in...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
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Elsevier
2021-08-01
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| Series: | Case Studies in Thermal Engineering |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2214157X21002902 |
| _version_ | 1819026671825584128 |
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| author | Wichakan Ketwong Thoranis Deethayat Tanongkiat Kiatsiriroat |
| author_facet | Wichakan Ketwong Thoranis Deethayat Tanongkiat Kiatsiriroat |
| author_sort | Wichakan Ketwong |
| collection | DOAJ |
| description | This research studied the direct evaporative cooling technique for generating cool air in hot–dry and hot–humid climates. For direct evaporative cooling, three parameters affected the air temperature: feedwater temperature, wet-bulb temperature, and mass ratio of feedwater to circulating air were investigated. When the feedwater temperature was lower than the wet-bulb temperature, in a hot-humid climate, an increase in the mass ratio of feedwater to the circulating air decreased the outlet air temperature. Conversely, if the feedwater temperature was higher than the wet-bulb temperature, in a hot-dry climate, a decrease in the mass ratio was needed to reduce the air temperature. The cooled air obtained could be used for condenser cooling of air-conditioner for performance enhancement. According to a 1 TR air conditioner simulation, lower feedwater temperature resulted in higher energy efficiency ratio. High mass ratio, thus, was recommended in the hot-humid climate area whereas less mass ratio was preferable for the hot-dry climate area. The energy efficiency ratios of the unit with direct evaporative cooling for hot–dry and hot–humid climates ranged from 3.40 to 4.22 and 3.30 to 3.94, respectively, compared to 3.01 for the normal unit. The payback period for the unit with direct evaporative cooling in case of Chiang Mai (hot-humid climate) was around 2.87 year. |
| first_indexed | 2024-12-21T05:30:17Z |
| format | Article |
| id | doaj.art-05fc749b78cc48f396ed82ba62651b59 |
| institution | Directory Open Access Journal |
| issn | 2214-157X |
| language | English |
| last_indexed | 2024-12-21T05:30:17Z |
| publishDate | 2021-08-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Case Studies in Thermal Engineering |
| spelling | doaj.art-05fc749b78cc48f396ed82ba62651b592022-12-21T19:14:34ZengElsevierCase Studies in Thermal Engineering2214-157X2021-08-0126101127Performance enhancement of air conditioner in hot climate by condenser cooling with cool air generated by direct evaporative coolingWichakan Ketwong0Thoranis Deethayat1Tanongkiat Kiatsiriroat2Energy Engineering Program, Faculty of Engineering and Graduate School, Chiang Mai University, 239 Huay Kaew Road, Muang District, Chiang Mai, 50200, ThailandDepartment of Mechanical Engineering, Faculty of Engineering, Chiang Mai University, 239 Huay Kaew Road, Muang District, Chiang Mai, 50200, Thailand; Corresponding author. Tel.: +66 53 944 146; fax: +66 53 8 944 145.Department of Mechanical Engineering, Faculty of Engineering, Chiang Mai University, 239 Huay Kaew Road, Muang District, Chiang Mai, 50200, ThailandThis research studied the direct evaporative cooling technique for generating cool air in hot–dry and hot–humid climates. For direct evaporative cooling, three parameters affected the air temperature: feedwater temperature, wet-bulb temperature, and mass ratio of feedwater to circulating air were investigated. When the feedwater temperature was lower than the wet-bulb temperature, in a hot-humid climate, an increase in the mass ratio of feedwater to the circulating air decreased the outlet air temperature. Conversely, if the feedwater temperature was higher than the wet-bulb temperature, in a hot-dry climate, a decrease in the mass ratio was needed to reduce the air temperature. The cooled air obtained could be used for condenser cooling of air-conditioner for performance enhancement. According to a 1 TR air conditioner simulation, lower feedwater temperature resulted in higher energy efficiency ratio. High mass ratio, thus, was recommended in the hot-humid climate area whereas less mass ratio was preferable for the hot-dry climate area. The energy efficiency ratios of the unit with direct evaporative cooling for hot–dry and hot–humid climates ranged from 3.40 to 4.22 and 3.30 to 3.94, respectively, compared to 3.01 for the normal unit. The payback period for the unit with direct evaporative cooling in case of Chiang Mai (hot-humid climate) was around 2.87 year.http://www.sciencedirect.com/science/article/pii/S2214157X21002902Evaporative coolingAir conditioner performanceEnergy efficiency ratioCondenser coolingHot weather conditions |
| spellingShingle | Wichakan Ketwong Thoranis Deethayat Tanongkiat Kiatsiriroat Performance enhancement of air conditioner in hot climate by condenser cooling with cool air generated by direct evaporative cooling Case Studies in Thermal Engineering Evaporative cooling Air conditioner performance Energy efficiency ratio Condenser cooling Hot weather conditions |
| title | Performance enhancement of air conditioner in hot climate by condenser cooling with cool air generated by direct evaporative cooling |
| title_full | Performance enhancement of air conditioner in hot climate by condenser cooling with cool air generated by direct evaporative cooling |
| title_fullStr | Performance enhancement of air conditioner in hot climate by condenser cooling with cool air generated by direct evaporative cooling |
| title_full_unstemmed | Performance enhancement of air conditioner in hot climate by condenser cooling with cool air generated by direct evaporative cooling |
| title_short | Performance enhancement of air conditioner in hot climate by condenser cooling with cool air generated by direct evaporative cooling |
| title_sort | performance enhancement of air conditioner in hot climate by condenser cooling with cool air generated by direct evaporative cooling |
| topic | Evaporative cooling Air conditioner performance Energy efficiency ratio Condenser cooling Hot weather conditions |
| url | http://www.sciencedirect.com/science/article/pii/S2214157X21002902 |
| work_keys_str_mv | AT wichakanketwong performanceenhancementofairconditionerinhotclimatebycondensercoolingwithcoolairgeneratedbydirectevaporativecooling AT thoranisdeethayat performanceenhancementofairconditionerinhotclimatebycondensercoolingwithcoolairgeneratedbydirectevaporativecooling AT tanongkiatkiatsiriroat performanceenhancementofairconditionerinhotclimatebycondensercoolingwithcoolairgeneratedbydirectevaporativecooling |