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Study on the simulation time increments for solar DHW heating systems; Taiyonetsu kyuto simulation ni okeru keisan jikan kankaku no kento

Abstract

Calculation time intervals effective in simulating solar DHW systems were discussed, taking into account water temperature in a heat storage tank and calorific power in supplied hot water. The discussion was given on a direct heat collecting system in which heat passes through a heat collector from the bottom of the heat storage tank and returns to the center of the tank, and an indirect heat collecting system which has a heat exchanger built inside the heat storage tank at its bottom. The calculation was performed with time intervals of one to sixty minutes and five to forty-five layer divisions. The following results were obtained: because the calorific power of the hot water supplied is underestimated in the calculation if the calorific power of one hot water supply is extremely large, the calculation time intervals must be reduced to 1 to 15 minutes; cumulative calorific power of the hot water supply was found to show little variation if the number of division is greater than fifteen; and the daily cumulative effective heat collection amount shows very little variation due to the calculation time intervals, but errors from the measured value have decreased as the smaller the number of layer division  More>>
Authors:
Sato, M; Udagawa, M [1] 
  1. Kogakuin University, Tokyo (Japan)
Publication Date:
Nov 25, 1997
Product Type:
Conference
Report Number:
ETDE/JP-98753622; CONF-9711143-
Reference Number:
SCA: 140907; 990301; PA: JP-98:0G1047; SN: 98001983477
Resource Relation:
Conference: 1997 JSES/JWEA joint conference, Taiyo/furyoku energy koen, Aichi (Japan), 28-29 Nov 1997; Other Information: PBD: 25 Nov 1997; Related Information: Is Part Of Proceedings of JSES/JWEA Joint Conference (1997); PB: 454 p.; Taiyo/Furyoku energy koen ronbunshu (1997)
Subject:
14 SOLAR ENERGY; 99 MATHEMATICS, COMPUTERS, INFORMATION SCIENCE, MANAGEMENT, LAW, MISCELLANEOUS; SOLAR WATER HEATERS; COMPUTERIZED SIMULATION; CALCULATION METHODS; ERRORS; TANKS; HEAT STORAGE; TEMPERATURE MEASUREMENT; SOLAR COLLECTORS; HEAT EXCHANGERS; SOLAR FLUX; VARIATIONS
OSTI ID:
366083
Research Organizations:
Japan Solar Energy Society, Tokyo (Japan)
Country of Origin:
Japan
Language:
Japanese
Other Identifying Numbers:
Other: ON: DE98753622; TRN: JN98G1047
Availability:
Available from Japan Solar Energy Society, 44-14, Yoyogi 2-chome, Shibuya-ku, Tokyo, Japan; OSTI as DE98753622
Submitting Site:
NEDO
Size:
pp. 129-132
Announcement Date:
Sep 02, 1999

Citation Formats

Sato, M, and Udagawa, M. Study on the simulation time increments for solar DHW heating systems; Taiyonetsu kyuto simulation ni okeru keisan jikan kankaku no kento. Japan: N. p., 1997. Web.
Sato, M, & Udagawa, M. Study on the simulation time increments for solar DHW heating systems; Taiyonetsu kyuto simulation ni okeru keisan jikan kankaku no kento. Japan.
Sato, M, and Udagawa, M. 1997. "Study on the simulation time increments for solar DHW heating systems; Taiyonetsu kyuto simulation ni okeru keisan jikan kankaku no kento." Japan.
@misc{etde_366083,
title = {Study on the simulation time increments for solar DHW heating systems; Taiyonetsu kyuto simulation ni okeru keisan jikan kankaku no kento}
author = {Sato, M, and Udagawa, M}
abstractNote = {Calculation time intervals effective in simulating solar DHW systems were discussed, taking into account water temperature in a heat storage tank and calorific power in supplied hot water. The discussion was given on a direct heat collecting system in which heat passes through a heat collector from the bottom of the heat storage tank and returns to the center of the tank, and an indirect heat collecting system which has a heat exchanger built inside the heat storage tank at its bottom. The calculation was performed with time intervals of one to sixty minutes and five to forty-five layer divisions. The following results were obtained: because the calorific power of the hot water supplied is underestimated in the calculation if the calorific power of one hot water supply is extremely large, the calculation time intervals must be reduced to 1 to 15 minutes; cumulative calorific power of the hot water supply was found to show little variation if the number of division is greater than fifteen; and the daily cumulative effective heat collection amount shows very little variation due to the calculation time intervals, but errors from the measured value have decreased as the smaller the number of layer division in the direct heat collecting system, and as the greater the number of division in the indirect heat collecting system. 4 refs., 9 figs., 2 tabs.}
place = {Japan}
year = {1997}
month = {Nov}
}