Experimental study of heat loss of heat storage tank in solar heating system of northwest region

Journal of Lanzhou University of Technology ›› 2020, Vol. 46 ›› Issue (4): 67-72.

• Mechanical Engineering and Power Engineering • Previous Articles Next Articles

Experimental study of heat loss of heat storage tank in solar heating system of northwest region

LI Jin-ping^1,2,3, LIU Run¹, CUI Wei-dong¹, HUANG Juan-juan^1,2,3, WANG Chuan-long^1,2,3

1. China Western Energy and Environment Research Center, Lanzhou Univ. of Tech., Lanzhou 730050, China;
2. China Northwestern Collaborative Innovation Center of Low-carbon Urbanization Technologies, Lanzhou Univ. of Tech., Lanzhou 730050, China;
3. Key Laboratory of Complementary Energy System of Biomass and Solar Energy of Gansu Province, Lanzhou Univ. of Tech., Lanzhou 730050, China

Received:2018-02-28 Online:2020-08-28 Published:2020-11-10

Abstract

Abstract: Taking the solar heating system in an 117.07 m² northwest China as investigation object and the day of December 15^th as an example, it is concluded that the heat loss of heat storage tank occurs mainly during the natural cooling period, the total heat loss of the heat storage tank is 9.49 MJ when its daily total heat loss coefficient is 5.68 W/℃. Then the test data of other 11 typical days is chosen to carry out the fitting of several factors of influence on total heatloss coefficient and total heat loss of the heat storage tank. It is shown that the total heat loss of the heat storage tank will be influenced by the ambient temperature and outdoor wind speed, leading to the change of the temperature of the heat storage tank. Decrease of every 1 ℃ of average ambient temperature will increase the total heat loss of heat storage tank by 0.067 MJ and the increase of every 1 m/s of outdoor wind speed will increase the total heat loss of the heat storage tank by 0.042 MJ, The increase of temperature of 1 ℃ of heat storage tank will increase the total heat loss of heat storage tank by 0.068 MJ. The increase of the temperature of 1 ℃ of heat storage tank will increas the total heat loss of the heat storage tank by 1.641 MJ. Aimed at the analysis of heat loss of heat storage tank and the present situation of indoor thermal environment, it is presented that a suggestion on indoor location of heat storage tank can be taken into consideration to enhance the heat storage capacity of heat storage tank and improve the indoor comfortableness of the building.

Key words: monoblock building, solar heating system, total heat loss coefficient of heat storage tank

CLC Number:

TK512.4

LI Jin-ping, LIU Run, CUI Wei-dong, HUANG Juan-juan, WANG Chuan-long. Experimental study of heat loss of heat storage tank in solar heating system of northwest region[J]. Journal of Lanzhou University of Technology, 2020, 46(4): 67-72.

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Experimental study of heat loss of heat storage tank in solar heating system of northwest region

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