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Small low flow solar heating systems. Experience from practice

Technical Report:

Abstract

Nine small low flow solar heating systems for domestic hot water supply have been built by three producers of solar collectors. The operation of the systems have been followed since the installation. The investigations showed that the promising results from laboratory experiments with small DHW low flow systems can be transferred to practice. Small DHW low flow systems can thus work without any problems with very high thermal performances. However, the investigations also showed that it is essential to optimize, design and install the systems in the right way. Only in this way the systems will be reliable and durable with high thermal performances. The design and control of the system should ensure that the heat loss from the heat storage is minimized and that the auxiliary energy source(s) only heat the needed volume of water to the required hot water temperature. Furthermore, thermosyphoning in the solar collector loop during nights and boiling in the solar collector during summer holidays should be avoided. Furthermore, in systems with a circulation piping it is important that the water returning from the circulation piping enters the hot water tank without causing mixing inside the tank. The low flow principle makes it possible both  More>>
Authors:
Publication Date:
May 01, 1992
Product Type:
Technical Report
Report Number:
DTH-LV-230
Reference Number:
SCA: 140907; PA: DK-92:001832; SN: 93000917930
Resource Relation:
Other Information: PBD: May 1992
Subject:
14 SOLAR ENERGY; SOLAR WATER HEATERS; PERFORMANCE TESTING; DESIGN; FLOW RATE; COST; THERMAL EFFICIENCY; HEAT STORAGE; EVALUATED DATA; SOLAR COLLECTORS; 140907; WATER HEATING
OSTI ID:
10110691
Research Organizations:
Danmarks Tekniske Hoejskole, Lyngby (Denmark). Lab. for Varmeisolering
Country of Origin:
Denmark
Language:
English
Other Identifying Numbers:
Other: ON: DE93752749; TRN: DK9201832
Availability:
OSTI; NTIS
Submitting Site:
DK
Size:
47 p.
Announcement Date:
Jun 30, 2005

Technical Report:

Citation Formats

Furbo, S. Small low flow solar heating systems. Experience from practice. Denmark: N. p., 1992. Web.
Furbo, S. Small low flow solar heating systems. Experience from practice. Denmark.
Furbo, S. 1992. "Small low flow solar heating systems. Experience from practice." Denmark.
@misc{etde_10110691,
title = {Small low flow solar heating systems. Experience from practice}
author = {Furbo, S}
abstractNote = {Nine small low flow solar heating systems for domestic hot water supply have been built by three producers of solar collectors. The operation of the systems have been followed since the installation. The investigations showed that the promising results from laboratory experiments with small DHW low flow systems can be transferred to practice. Small DHW low flow systems can thus work without any problems with very high thermal performances. However, the investigations also showed that it is essential to optimize, design and install the systems in the right way. Only in this way the systems will be reliable and durable with high thermal performances. The design and control of the system should ensure that the heat loss from the heat storage is minimized and that the auxiliary energy source(s) only heat the needed volume of water to the required hot water temperature. Furthermore, thermosyphoning in the solar collector loop during nights and boiling in the solar collector during summer holidays should be avoided. Furthermore, in systems with a circulation piping it is important that the water returning from the circulation piping enters the hot water tank without causing mixing inside the tank. The low flow principle makes it possible both to increase the thermal performance and to decrease the costs of the solar heating systems. To day only one Danish manufacturer is producing low flow systems. The experience from this project can therefore be utilized in connection with the developing work of the other producers in such a way that inexpensive, reliable, durable marketed low flow systems with high thermal performances can be developed. (au) (11 refs.).}
place = {Denmark}
year = {1992}
month = {May}
}