Effects of stacked condensers in a high-rise apartment building

Choi, Seokho; Lee, Kwan-Soo; Kim, Byung-Soon

doi:10.1016/j.energy.2004.08.004

Cited by 25 publications

(6 citation statements)

References 8 publications

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“…Numerical analysis of top discharged condensing unit showed the similar result, in which the COP only slightly affected by the front wall distance if the wind was directed from the rear of the condensing unit [16]. Meanwhile, the temperature of outdoor unit increases as the outdoor wind speed increases [17]. a.…”

Section: Copmentioning

confidence: 67%

Effect of Air Flow Obstruction in a Condensing Unit on Split Air Conditioner Performance

Setyawan

2020

Jurnal Teknologi

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Obstructions of air flow in the outdoor unit could block the condenser air flow and reduce its heat rejection As a result, it could decrease the performance of a room air conditioning system. The paper presents the effects of the air flow obstruction of a condensing unit on the performance of a split-type air conditioner with refrigerant R410A. The study was conducted experimentally by employing front and side obstructions with varied distance from the condensing unit. The front obstruction of 100 cm height was applied at varied distance from 10 cm to 100 cm, while the side obstruction of the same height was applied at distance of 5, 10, and 15 cm. The presence of air flow obstructions results in the decrease of cooling capacity and coefficient of performance (COP). On the other hand, it increases the input power of the AC unit. From the experiment, it is obvious that the distance of front obstruction of 10 cm results in the reduction of cooling capacity by 46% and COP by 56%. It is also revealed that the distance of the front obstruction of 50 cm or more has no significant effect for the performance of the air conditioning unit. In addition, the side obstructions have the less significant effect than that of the front obstruction.

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Section: Copmentioning

confidence: 67%

Effect of Air Flow Obstruction in a Condensing Unit on Split Air Conditioner Performance

Setyawan

2020

Jurnal Teknologi

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“…A primary culprit in the increased energy demand due to increased temperatures in the microclimate around building systems is also the stacking of condensing units for window air conditioners leading to decreased COPs. As was identified by previous studies [17] the stacking of the condensing units could lead to localized urban heat island effect resulting in the increase of local temperature at 2 to 4 °C at 40 stories. More recent research has experimentally found that such a setup decreases performance of air conditioning units in a 25 storey building, creating a 40% decline in the COP at the 25th floor due to the 'stuck and stack' effect identified by Bruelisauer et al [18].…”

Section: Stack Effectmentioning

confidence: 68%

Urban cooling primary energy reduction potential: System losses caused by microclimates

Meggers

Aschwanden

Teitelbaum

et al. 2016

Sustainable Cities and Society

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“…According to the findings, each 1°C increase in ambient temperature reduces the system's total cooling capacity and energy efficiency ratio by 2%. Choi et al [13] analyzed the increase in the working temperature of the condensing units with an increase in the environmental wind speed. The case of installing the outdoor units in the mechanical room was expected.…”

Section: Literature Reviewmentioning

confidence: 99%

CFD Simulation of Thermal Plume of VRF Air Conditioners for Cooling Season in Semi-Closed Spaces for Erbil Climate Conditions

Abdullah¹,

Barwari²

2022

IJHT

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The variable refrigerant flow (VRF) system is extensively utilized for the purpose of space cooling and heating in residential and commercial buildings. The VRF outdoor units are frequently placed on balconies of multi-storey buildings, and the aluminum louvers conceal them to keep the aesthetic architecture appearance. This type of installation will cause the thermal plume influence of the dissipated heat discharged from condensing units to cause high suction temperature, high energy consumption, and low coefficient of performance of the system. The numerical results showed that the discharged heat from condensing units will lead to rising thermal plume influence, causing greater suction temperatures for VRF outdoor units on top floors, even overriding the operating temperature range. It also shows that removing the inward louver in front of the discharge duct on each floor is an efficient method to deteriorate the thermal plume influence for VRF air conditioners and enhance the thermal efficiency of the entire system. For the proposed design, the average suction temperatures could be reduced by 8%, 15%, and 19% for VRF outdoor units for floors 10th, 11th, & 12th, respectively. This work aims to provide guidelines for the placement of VRF air conditioners in buildings in the designing stage.

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Effects of stacked condensers in a high-rise apartment building

Cited by 25 publications

References 8 publications

Effect of Air Flow Obstruction in a Condensing Unit on Split Air Conditioner Performance

Effect of Air Flow Obstruction in a Condensing Unit on Split Air Conditioner Performance

Urban cooling primary energy reduction potential: System losses caused by microclimates

CFD Simulation of Thermal Plume of VRF Air Conditioners for Cooling Season in Semi-Closed Spaces for Erbil Climate Conditions

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