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Characteristics on the heat storage and recovery by the underground spiral heat exchange pipe; Chichu maisetsu spiral kan ni yoru chikunetsu shunetsu tokusei

Abstract

The consistency between the experimental value of a soil temperature and the calculation value of a soil temperature given by a non-steady heat conduction equation was confirmed. The experimental value is obtained by laying a spiral heat exchange pipe in the heat-insulated soil box and circulating hot water forcibly in the pipe. The temperature conductivity in soil significantly influences the heat transfer in soil. The storage performance is improved when the temperature conductivity increases because of the contained moisture. As the difference between the initial soil temperature and circulating water temperature becomes greater, the heat storage and recovery values increase. A thermal core heat transfer is done in the spiral pipe. Therefore, the diameter of the pipe little influences the heat storage performance, and the pitch influences largely. About 50 hours after heat is stored, the storage performance is almost the same as for a straight pipe that uses the spiral diameter as a pipe diameter. To obtain the same heat storage value, the spiral pipe is made of fewer materials than the straight pipe and low in price. The spiral pipe is more advantageous than the straight pipe in the necessary motive power and supply heat of a pump.  More>>
Authors:
Imai, I; [1]  Taga, M [2] 
  1. Kure National College of Technology, Hiroshima (Japan)
  2. Kinki University, Osaka (Japan)
Publication Date:
Oct 27, 1996
Product Type:
Conference
Report Number:
CONF-9610295-
Reference Number:
SCA: 142000; PA: NEDO-96:915465; EDB-97:072058; SN: 97001783009
Resource Relation:
Conference: JSES/JWEA joint conference (1996), 1996 nendo nihon taiyo energy gakkai nihon furyoku energy kyokai godo kenkyu happyokai, Yamagata (Japan), 31 Oct - 1 Nov 1996; Other Information: PBD: 27 Oct 1996; Related Information: Is Part Of Proceedings of JSES/JWEA Joint Conference (1996); PB: 406 p.; Taiyo/furyoku energy koen ronbunshu (1996)
Subject:
14 SOLAR ENERGY; PIPES; UNDERGROUND; HEAT EXCHANGERS; HEAT STORAGE; HEAT RECOVERY; SOILS; THERMAL INSULATION; WATER HEATING; FORCED CONVECTION; UNSTEADY FLOW; EQUATIONS OF STATE; HEAT TRANSFER; THERMAL CONDUCTIVITY; PUMPS; ENERGY CONSERVATION; ENERGY SUPPLIES
OSTI ID:
472758
Research Organizations:
Japan Solar Energy Society, Tokyo (Japan)
Country of Origin:
Japan
Language:
Japanese
Other Identifying Numbers:
Other: ON: DE97744185; TRN: 96:915465
Availability:
Available from Japan Solar Energy Society, 44-14, Yoyogi 2-chome, Shibuya-ku, Tokyo, Japan; OSTI as DE97744185
Submitting Site:
NEDO
Size:
pp. 141-144
Announcement Date:
Jun 03, 1997

Citation Formats

Imai, I, and Taga, M. Characteristics on the heat storage and recovery by the underground spiral heat exchange pipe; Chichu maisetsu spiral kan ni yoru chikunetsu shunetsu tokusei. Japan: N. p., 1996. Web.
Imai, I, & Taga, M. Characteristics on the heat storage and recovery by the underground spiral heat exchange pipe; Chichu maisetsu spiral kan ni yoru chikunetsu shunetsu tokusei. Japan.
Imai, I, and Taga, M. 1996. "Characteristics on the heat storage and recovery by the underground spiral heat exchange pipe; Chichu maisetsu spiral kan ni yoru chikunetsu shunetsu tokusei." Japan.
@misc{etde_472758,
title = {Characteristics on the heat storage and recovery by the underground spiral heat exchange pipe; Chichu maisetsu spiral kan ni yoru chikunetsu shunetsu tokusei}
author = {Imai, I, and Taga, M}
abstractNote = {The consistency between the experimental value of a soil temperature and the calculation value of a soil temperature given by a non-steady heat conduction equation was confirmed. The experimental value is obtained by laying a spiral heat exchange pipe in the heat-insulated soil box and circulating hot water forcibly in the pipe. The temperature conductivity in soil significantly influences the heat transfer in soil. The storage performance is improved when the temperature conductivity increases because of the contained moisture. As the difference between the initial soil temperature and circulating water temperature becomes greater, the heat storage and recovery values increase. A thermal core heat transfer is done in the spiral pipe. Therefore, the diameter of the pipe little influences the heat storage performance, and the pitch influences largely. About 50 hours after heat is stored, the storage performance is almost the same as for a straight pipe that uses the spiral diameter as a pipe diameter. To obtain the same heat storage value, the spiral pipe is made of fewer materials than the straight pipe and low in price. The spiral pipe is more advantageous than the straight pipe in the necessary motive power and supply heat of a pump. 1 ref., 11 figs., 1 tab.}
place = {Japan}
year = {1996}
month = {Oct}
}