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Indexed by:期刊论文

Date of Publication:2015-11-02

Journal:INTERNATIONAL JOURNAL OF GREEN ENERGY

Included Journals:SCIE、EI

Volume:12

Issue:11

Page Number:1178-1188

ISSN No.:1543-5075

Key Words:Chinese kang; Elevated kang; Thermal performance; Experimental assessment

Abstract:Chinese kangs are widely used by 175 million people for sleeping and home heating in rural Northern China. However, there are lack of some basic and critical studies on heat transfer and smoke flow characteristics of the kangs, which definitely hinder the development of Chinese kangs. This study presents an experimental assessment on a typically elevated Chinese kang. The heat gain, heat storage, and the heat release performance of the kang body are investigated, respectively, by combining the test data and theoretical analysis. The main results show that the smoke temperature at the inlet face of the kang flue varies within 250 degrees C-600 degrees C as the stove works for the most times. The smoke velocity in the kang flue is about 0.1 m/s-0.4 m/s, and the flow status is determined to be turbulent. The heat exchange between the smoke and the kang plates is mainly by natural convection. The surface temperature of the upper kang plate has significant temporal variation, and its distribution at the center part is reasonably uniform. The radiative heat from the kang plates plays a big role in the total heat release, accounting for 60.6% for the upper plate and 83.3% for the lower plate.