# Application of Computational Fluid Dynamics to Flow Next to High-Rise Buildings in Hong Kong Due to Air-Conditioner Heat Rejection Report (Assessment)

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Updated: Apr 2nd, 2019

The article under consideration is titled “Application of Computational Fluid Dynamics to flow next to high-rise buildings in Hong Kong due to air-conditioner heat rejection”. It is written by Bojic M., Savic S., and Nikolic D. in 2008 in the International Journal of Energy Technology and Policy.

This article presents the Computational Fluid Dynamics simulation of the situations when the Window Air-Conditioners reject condenser heat.

The authors of the research wanted to consider how the situation is going to develop under the particular conditions in order to prepare the basis for the further research connected with solving the problem of Window Air-Conditioners rejecting condenser heat and predicting its consequences. The article consists of several sections.

The introduction, the mathematical model: Computational Fluid Dynamics development, the simulation, the results with several subtopics (“flow and temperature field in the recessed space”, “flow and temperatures of the bulk flow in the recessed space”, “horizontal development of flow and temperature field with depth of a recessed space”, “bulk flow with depth of a recessed space – vertical development”, “flows to condensers with depth of a recessed space – vertical development”, “influence of plates on the bulk, buoyant airflow inside the recessed space”, and “influence of plates on the flow – flow of air through condenser units”), and conclusion.

The article is supported with the abstract, keywords, biographical notes, nomenclature, and reference list. The article is presented in the

The main idea of the article is to conduct a simulation of the situations when the Window Air-Conditioners reject condenser heat by means of the Computational Fluid Dynamics. The results of the research have provided two outcomes which lead to two results.

Thus, if the mass-flow rate is lower than the nominal condenser, however, the outdoors air temperature is higher, the energy losses are considered. Otherwise, if the mass-flow rate is higher than the nominal condenser and the outdoors air temperature is higher, the energy benefit is observed.

These results allow to make sure that the depth of the recessed space does not have any connection with the average mass flow rates and at the same time does not impact the average temperatures.

One of the main ideas of the research was to extend the results presented in the Bojic, Lee, and Yik (2001, 2002, & 2003). The authors managed to prove that the presence of the plate inside the recessed space is important as in this case the temperature may be reduced which is really important for the situation.

Therefore, it may be concluded that the authors have managed to reach the set purposes of their discussion. It should also be stated that the research results may be used in practice as their relevance has been proven by the validity of the methodology and the detailed description of the research results.

The simulation is the step on the way to the consideration of the problems connected with the Window Air-Conditioners which may reject condenser heat.

Applying to the results of this research, the high-rise residential buildings in Hong Kong may evaluate the possible outcomes and make sure that hey have done all possible to avoid the negative effect of the Window Air-Conditioners reject condenser heat.

The research conducted by Bojic, Savic, and Nikolic (2008) has both practical and theoretical value as the further research in the problem solving sphere is possible on the basis of this research.

## Reference List

Bojic, M, Lee, M, & Yik, F 2001, ‘Flow and temperatures outside a high-rise residential building due to heat rejection by its air-conditioners’, Energy and Buildings, vol. 33, pp.737–751.

Bojic, M, Lee, M, & Yik, F 2002, ‘Influence of a depth of a recessed space to flow due to air conditioner heat rejection’, Energy and Buildings, vol. 34, pp.33–43.

Bojic, M, Yik, F, & Lee, M 2003 ‘Influence of plates on flow inside a recessed space generated by rejected heat’, Building and Environment, vol. 38, pp.593–604.

Bojic, M, Savic, S, & Nikolic, D 2008, ‘Application of Computational Fluid Dynamics to flow next to high-rise buildings in Hong Kong due to air-conditioner heat rejection’, Int. J. Energy Technology and Policy, vol. 6, no. 1/2, pp. 159-177.

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References

IvyPanda. (2019) 'Application of Computational Fluid Dynamics to Flow Next to High-Rise Buildings in Hong Kong Due to Air-Conditioner Heat Rejection'. 2 April.