Stuck in a stack—Temperature measurements of the microclimate around split type condensing units in a high rise building in Singapore

Bruelisauer, Marcel; Meggers, Forrest; Saber, Esmail M.; Li, Cheng; Leibundgut, Hansjürg

doi:10.1016/j.enbuild.2013.11.056

Cited by 41 publications

(17 citation statements)

References 12 publications

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“…This follow up study could provide insights for the installation of HVAC systems in dense urban neighborhoods, especially Asian cities such as Hong Kong and Singapore, that tend to install window packaged units at each floor [49,50,53]. This kind of installation allows the heat rejection from the lower floor unit to increase the local re-entrant temperature to the upper level units and effect the performance of the condenser of the HVAC systems in the upper floors [49].…”

Section: ℎ = ܷܽ ଵmentioning

confidence: 93%

“…Figure 3 Variation of the averaged normalized operational COP of the cooling HVAC systems for the windward and leeward walls as well as the roofs [47] To further quantify the influence of the urban neighborhood and placement of the HVAC systems for the high-rise buildings, a follow up study could include additional inputs, such as heat rejection from the individual units, location of the units, and location of the urban neighborhood, in addition to the assumptions used in the previous reviewed studies [47,54]. This follow up study could provide insights for the installation of HVAC systems in dense urban neighborhoods, especially Asian cities such as Hong Kong and Singapore, that tend to install window packaged units at each floor [49,50,53]. This kind of installation allows the heat rejection from the lower floor unit to increase the local re-entrant temperature to the upper level units and effect the performance of the condenser of the HVAC systems in the upper floors [49].…”

Section: Figure 1 Representation Of a Campus Urban Neighborhood With mentioning

confidence: 98%

“…Operational COP ‫ܱܲܥ(‬ ௧ ) is defined as a COP that accounts for the influence of the urban neighborhood on the reduction of the rated COP that manufactures usually provide, known as rated COP ‫ܱܲܥ(‬ ௧ௗ ), to the user of the HVAC cooling systems. Since there is limited number of peer reviewed studies that derived the rated COP correlations as a function of outdoor air temperature based on the manufacture data [48][49][50][51][52][53], there is a need to define an averaged operational COP to weigh the influence of different rated COP correlations that exist in the literature [46,47]. To emphasize on the degradation of the COP of the cooling systems with the increase in the urban plan area density, a nondimensional averaged COP ‫ܱܲܥ(‬ ௩ௗ ௭ௗ ௧ ௧ ఒ ) can be defined.…”

mentioning

confidence: 99%

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Building neighborhood emerging properties and their impacts on multi-scale modeling of building energy and airflows

Srebric

Heidarinejad

Liu

2015

Building and Environment

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Section: ℎ = ܷܽ ଵmentioning

confidence: 93%

Section: Figure 1 Representation Of a Campus Urban Neighborhood With mentioning

confidence: 98%

mentioning

confidence: 99%

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Building neighborhood emerging properties and their impacts on multi-scale modeling of building energy and airflows

Srebric

Heidarinejad

Liu

2015

Building and Environment

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“…Bruelisauer et al made experimental evaluation of the stack effect induced by the heat rejected from split type airconditioners in a high rise building, with sensors located at specific heights and by using CFD simulations [35]. Though his work clearly showed the decrease in COP due to stack effect, however it needed to incorporate more dynamic conditions to evaluate the effects under different operational and environmental conditions.…”

Section: B Solution Approaches In Analysis Simulation and Modellingmentioning

confidence: 99%

“…In case of study on effect of microclimate on split type condensers [35], the inlet temperature at the condensing units were seen to rise in a high rise building due to stack effect, and consequently the COP decreased. Unintended consequences, both known and presently unknown arises due to refurbishment and various energy conservation measures.…”

Section: B Findings In Thermal Load Modelling In Buildingsmentioning

confidence: 99%

Energy Conservation in Buildings – a Review

Thapa¹,

Panda²

2015

IJEE

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Abstract-The primary function of a building is to provide thermally comfortable environment to its occupants. A good indoor climate is important for the success of any building, not only because it will make its occupants comfortable, but also because it will decide its energy consumption, and thus influences its sustainability. A literature review of over 100 research papers, in four areas in the field of Energy Conservation in Buildings, i.e. (i) Climate Responsive Buildings, (ii) Analysis, Simulation and Modelling, (iii) Zero Energy Buildings and (iv) Thermal Comfort, were conducted in order to obtain a valid research topic. The findings of the literature survey is presented in this paper which include issue wise discussion, solution approaches used by various researchers, strengths, weaknesses and future scope of work in the four issues pertaining to energy conservation in buildings. Out of the several identified lag, it was felt that there was a dearth of field studies based thermal comfort research in India, which is essential for the correct definition of building codes. Proper building codes are required not only for providing comfort condition but also to conserve energy. Hence field studies based thermal comfort study was considered for further research study. Thus, this paper summarizes the researches about Climate Responsive Buildings, Analysis, Simulation and Modelling, Zero Energy Buildings and Thermal Comfort. It also concludes the methodology of these researches in above four fields, and gives further work suggestions.

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Increasing the Efficacy of an Air Conditioning Unit by Utilizing Phase Change Material With Cylindrical Configuration

Sao,

Arora,

Sahu

2024

Energy Storage

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The goal of the current study is to determine how the SST and the standard turbulence models prediction on PCM with cylindrical configuration affect AC performance and PCM discharging when coupled with an AC unit. For simulation, 308.15 K and 318.15 K, the inflow air temperature has been considered with a fixed 33.6 L/s intake air flow rate. The low outside temperature charges the PCMs during the night. During the daytime, heated ambient air is cooled by the PCM heat exchanger before passing over the unit condenser. The present outcomes show that using the standard model, the cylindrical PCM has the lowest time of complete melting. The temperature contours demonstrate that turbulence occurs, particularly at higher temperatures, in the PCM melting zone within the solid region. This implies that there is increased convection in this area. The maximum improved percentage in COP increases as the rising input air temperature for both turbulence models increases. The average power saving of AC at 308.15 K of an input air temperature for 83.33 min is predicted by both the standard and the SST to be 14.0905 W and 14.1089 W, respectively.

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Stuck in a stack—Temperature measurements of the microclimate around split type condensing units in a high rise building in Singapore

Cited by 41 publications

References 12 publications

Building neighborhood emerging properties and their impacts on multi-scale modeling of building energy and airflows

Building neighborhood emerging properties and their impacts on multi-scale modeling of building energy and airflows

Energy Conservation in Buildings – a Review

Increasing the Efficacy of an Air Conditioning Unit by Utilizing Phase Change Material With Cylindrical Configuration

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