Paper 7
A Simulation Study on the Reduction
of Cooling Loads in a Detached House by Cross-Ventilation using the Local
Dynamic Similarity Model
M.
Ohba1,
T. Kurabuchi2 , K. Tsukamoto1, T. Nonaka3 and T. Goto4
1Department
of Architecture, Tokyo Polytechnic University, Atsugi, Japan
2Tokyo University of Science, Tokyo, Japan
3TOSTEM Corporation, Tokyo,
Japan
4Yamaguchi University, Yamaguchi, Japan
Abstract
A simulation study on the reduction of cooling loads by utilizing
cross-ventilation was performed for a typically shaped house as defined by
the Architectural Institute of Japan. A reduction in cooling load of
around 50% could be achieved when the windows were opened liberally at
night compared with the cooling load when all the windows remained closed,
regardless of building coverage ratio.
Key words: Local Dynamic Similarity model, cross-ventilation,
COMIS, TRNSYS, detached house, cooling load, ventilation path, energy
saving.
References
Irwin HPAH: (1981) "A simple omnidirectional sensor for
wind-tunnel studies of pedestrian-level winds", Journal of Wind
Engineering and Industrial Aerodynamics, 7, pp219-239.
Kurabuchi T, Ohba M, Endo T, Akamine Y and Nakayama F: (2004)
"Local dynamic similarity of cross-ventilation, Part 1 Theoretical
framework", The International Journal of Ventilation, 2, (4),
pp371-382.
Kurabuchi T, Ohba M, Goto T, Akamine Y, Endo T and Kamata M: (2005)
"Local dynamic similarity concept as applied to the evaluation of
discharge coefficients of cross ventilated buildings, Part 1 Basic idea
and underlying wind tunnel tests; Part 2 Applicability of local dynamic
similarity model; Part 3 Simplified method for estimating dynamic pressure
tangential to openings of cross-ventilated buildings", The
International Journal of Ventilation, 4, (3), pp285-300.
Nagai T: (2006). "Windows and HVAC operation to reduce cooling
requirement by means of cross-ventilation", The International Journal
of Ventilation, 5, (1), pp151-162.
Ohba M, Kurabuchi T., Endo T., Akamine Y., Kamata M and Kurahashi A:
(2004) "Local dynamic similarity of cross-ventilation, Part 2
Application of local similarity model", The International Journal of
Ventilation, 2, (4), pp383-393.
Ohba M, Goto T, Kurabuchi T et al.: (2006). "Experimental study on
predicting wind-driven cross-ventilation flow rates and discharge
coefficients based on the Local dynamic similarity model", The
International Journal of Ventilation, 5, (1), pp105-114.
Ohba M, Kurabuchi T, Goto T. et al: (2008a). "Prediction accuracy
of ventilation flow rates by COMIS model combined with local dynamic
similarity model", Annual meeting of AIJ, pp753-754 (in Japanese).
Ohba M, Kurabuchi T, Goto T et al. (2008b). "Study on prediction
of ventilation flow rates in detached house based on coupled simulation of
semi-empirical envelope flow model and network model", Proceedings of
4th International Conference on Advances in Wind & Structures, Korea,
pp1156-1166.
Tsukamoto K, Ohba M, Kurabuchi T et al: (2009). "Study on
reduction of cooling loads in detached house by cross-ventilation using
coupled simulation of semi-empirical ventilation model and network
models", Proceedings of the 11th International Conference on Air
Distribution in Rooms, Korea, pp.VS3-1-VS3-6 (e-format) .
Udagawa H: (1985). "Typical problems for house", 15th Heat
Symposium, AIJ (in Japanese).
Vickery BJ and Karakatsanis C: (1987) "External wind pressure
distributions and induced internal ventilation flow in low-rise industrial
and domestic structures", ASHRAE Transactions, 93, Part 2,
pp2198-2213.
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