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Improvement of effect of a solar heating system; Foroegelse af solvarmeanlaegs ydelse

Technical Report:

Abstract

This report describes an investigation of the increase in performance for a solar heating system through use of combined air/liquid collectors instead of the usual liquid collectors. The efficiency of two different air/liquid collectors was measured under standard conditions in the solar simulator at the Thermal Insulation Laboratory, and different types of efficiency formulas were derived. One of the collectors was a commercial product from the manufacturer Aidt Miljoe, and the other was a prototype of the so-called MF/AW-collector (Multi-Function/Air-Water-collector). During the tests it was found that the air section of the MF/AW-collector was rather leaky so that a substantial part of the air bypassed the absorber. Thus the collector showed much lower efficiency than expected, and decreasing efficiency at increasing air flow rates. Based on the efficiency test, computer simulations of the performance of solar systems with the two collector types have been carried out, with two different programs. Combined systems with 5 m{sup 2} solar collectors for one-family houses were investigated and compared with a similar system with normal liquid collectors. None of the simulation programs developed so far can handle combined air/liquid systems correctly, and it was therefore necessary to make a number of simplifying assumptions regarding  More>>
Publication Date:
Sep 01, 1994
Product Type:
Technical Report
Report Number:
DTU-LV-MEDD-264
Reference Number:
SCA: 141000; 140901; PA: DK-95:001084; EDB-95:020727; SN: 95001320363
Resource Relation:
Other Information: PBD: Sep 1994
Subject:
14 SOLAR ENERGY; SOLAR COLLECTORS; HEAT TRANSFER FLUIDS; SOLAR HEATING SYSTEMS; COEFFICIENT OF PERFORMANCE; AIR FLOW; COMPUTERIZED SIMULATION; 141000; 140901; SOLAR COLLECTORS AND CONCENTRATORS; SPACE HEATING AND COOLING
OSTI ID:
10110358
Research Organizations:
Danmarks Tekniske Univ., Lyngby (Denmark). Lab. for Varmeisolering
Country of Origin:
Denmark
Language:
Danish
Other Identifying Numbers:
Other: ON: DE95737562; CNN: Contract ENS-51181-93.0020; TRN: DK9501084
Availability:
OSTI; NTIS
Submitting Site:
DK
Size:
84 p.
Announcement Date:
Jun 30, 2005

Technical Report:

Citation Formats

Kristiansen, F, and Oestergaard Jensen, S. Improvement of effect of a solar heating system; Foroegelse af solvarmeanlaegs ydelse. Denmark: N. p., 1994. Web.
Kristiansen, F, & Oestergaard Jensen, S. Improvement of effect of a solar heating system; Foroegelse af solvarmeanlaegs ydelse. Denmark.
Kristiansen, F, and Oestergaard Jensen, S. 1994. "Improvement of effect of a solar heating system; Foroegelse af solvarmeanlaegs ydelse." Denmark.
@misc{etde_10110358,
title = {Improvement of effect of a solar heating system; Foroegelse af solvarmeanlaegs ydelse}
author = {Kristiansen, F, and Oestergaard Jensen, S}
abstractNote = {This report describes an investigation of the increase in performance for a solar heating system through use of combined air/liquid collectors instead of the usual liquid collectors. The efficiency of two different air/liquid collectors was measured under standard conditions in the solar simulator at the Thermal Insulation Laboratory, and different types of efficiency formulas were derived. One of the collectors was a commercial product from the manufacturer Aidt Miljoe, and the other was a prototype of the so-called MF/AW-collector (Multi-Function/Air-Water-collector). During the tests it was found that the air section of the MF/AW-collector was rather leaky so that a substantial part of the air bypassed the absorber. Thus the collector showed much lower efficiency than expected, and decreasing efficiency at increasing air flow rates. Based on the efficiency test, computer simulations of the performance of solar systems with the two collector types have been carried out, with two different programs. Combined systems with 5 m{sup 2} solar collectors for one-family houses were investigated and compared with a similar system with normal liquid collectors. None of the simulation programs developed so far can handle combined air/liquid systems correctly, and it was therefore necessary to make a number of simplifying assumptions regarding the operation and control of the solar system in order to carry out the simulations. The different simplifications leading to different estimates of the performance have been compared and discussed in the report. (au)}
place = {Denmark}
year = {1994}
month = {Sep}
}