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A Study on the Energy Saving of Cooling/Reheating System Using Heat Exchanger  

Kim, Jin-Hyuck (Department of Mechanical Engineering, Korea Advanced Institute of Science and Technology)
Yoo, Seong-Yeon (BK21 Mechatronics Group, Chungnam National University)
Choi, Yang-Kyu (BK21 Mechatronics Group, Chungnam National University)
Publication Information
Korean Journal of Air-Conditioning and Refrigeration Engineering / v.22, no.7, 2010 , pp. 482-491 More about this Journal
Abstract
In conventional air-handling units, when the circulated air from the air-conditioned space pass through the cooling coil, the air is over-cooled to eliminate the moisture as well as to decrease the temperature. The purpose of this study is to estimate the thermal performance and energy saving of the cooling/reheating system using heat exchanger which can save both cooling energy and reheating energy by exchanging heat between the cooled air and reheated air. The energy balance equations to estimate the state of the air for each components were provided and the heat transfer rates and the energy saving rates for the system were calculated from the equations. The results showed that the energy saving was up to 40% under present conditions, and saving rates were significantly affected by the air velocity, inlet conditions and the effectiveness of heat exchanger.
Keywords
Cooling/reheating system; Heat exchanger; Energy saving; Air handing unit;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
연도 인용수 순위
1 Yau, Y. and Tucker, A., 2003, The performance study of a wet six-row heat pipe heat exchanger operating in tropical buildings, Int. J. of Energy Research, Vol. 27, No. 5, pp. 187-202.   DOI
2 Yau, Y., 2007, Application of a heat pipe heat exchanger to dehumidification enhancement in a HVAC system for tropical climate-a baseline performance characteristics study, Int. J. of Thermal Sciences, Vol. 46, No. 2, pp. 164-171.   DOI   ScienceOn
3 Chen, X. and Jiang, Y., 2005, Field study on independent dehumidification air-conditioning system-II : Performance of the whole system, ASHRAE Trans., Vol. 111, No. 2, pp. 277-284.
4 Kim, B. C., Shin, H. J., and Kim, J. Y., 2002, The characteristics of a bypass air conditioning system for load variation, Korean Journal of Air-Conditioning and Refrigeration Engineering, Vol. 14, No. 3, pp. 240-246.   과학기술학회마을
5 Park, S. T., Kim, Y. I., Kim. J. C., and Chou, S. Y., 2007, Four-season dedicated outdoor airhandling unit, Proc. of SAREK '07 Annual Summer Conference, pp. 917-922.
6 Zhang, L., 2006, Energy performance of independent air dehumidification systems with energy recovery measures, Energy, Vol. 31, No. 8, pp. 1228-1242.   DOI   ScienceOn
7 Zhang, L., Zhu, D., Deng, X., and Hua, B., 2005, Thermodynamic modeling of a novel air dehumidification system, Energy and Building, Vol. 37, No. 3, pp. 279-286.   DOI   ScienceOn
8 Chua, K., Chou, S., and Ho, J., 2008, A model to study the effects of different control strategies on space humidity during part-load conditions, Building and Environment, Vol. 43, No. 12, pp. 2074-2089.   DOI   ScienceOn