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Performance Evaluation of a High Solar Fraction CPC-Collector System

Bernardo, Ricardo LU ; Davidsson, Henrik LU and Karlsson, Björn LU (2011) In Journal of Environment and Engineering 6(3). p.680-692
Abstract
One of the most important goals on solar collector development is to increase the

system’s annual performance without increasing overproduction. The studied

collector is formed by a compound parabolic reflector which decreases the collector

optical efficiency during the summer period. Hence, it is possible to increase the

collector area and thus, the annual solar fraction, without increasing the

overproduction. Collector measurements were fed into a validated TRNSYS

collector model which estimates the solar fraction of the concentrating system and

also that of a traditional flat plate collector, both for domestic hot water production.

The system design approach aims to... (More)
One of the most important goals on solar collector development is to increase the

system’s annual performance without increasing overproduction. The studied

collector is formed by a compound parabolic reflector which decreases the collector

optical efficiency during the summer period. Hence, it is possible to increase the

collector area and thus, the annual solar fraction, without increasing the

overproduction. Collector measurements were fed into a validated TRNSYS

collector model which estimates the solar fraction of the concentrating system and

also that of a traditional flat plate collector, both for domestic hot water production.

The system design approach aims to maximise the collector area until an annual

overproduction limit is reached. This is defined by a new deterioration factor that

takes into account the hours and the collector temperature during stagnation

periods. Then, the highest solar fraction achieved by both systems was determined.

The results show that, at 50° tilt in Lund, Sweden, the concentrating system

achieves 71% solar fraction using 17 m2 of collector area compared to 66% solar

fraction and 7 m2 of a flat plate collector system. Thus, it is possible to install 2.4

times more collector area and achieve a higher solar fraction using the load adapted

collector. However, the summer optical efficiency reduction was proven to be too

abrupt. If the reflector geometry is properly design, the load adapted collector can

be a competitive solution in the market if produced in an economical way. (Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Concentrating Solar Thermal, CPC, Domestic Hot Water, High Solar Fraction
categories
Higher Education
in
Journal of Environment and Engineering
volume
6
issue
3
pages
680 - 692
publisher
Japanese Society of Mechanical Engineers
DOI
10.1299/jee.6.680
project
International Energy Agency. Solar Heating and Cooling Programme
language
English
LU publication?
yes
id
5780e2d9-5bff-4cc8-89f7-d065f2d411e8 (old id 3351125)
alternative location
http://www.jstage.jst.go.jp/article/jee/6/3/6_680/_article
date added to LUP
2014-04-28 11:25:57
date last changed
2016-04-16 09:01:44
@misc{5780e2d9-5bff-4cc8-89f7-d065f2d411e8,
  abstract     = {One of the most important goals on solar collector development is to increase the<br/><br>
system’s annual performance without increasing overproduction. The studied<br/><br>
collector is formed by a compound parabolic reflector which decreases the collector<br/><br>
optical efficiency during the summer period. Hence, it is possible to increase the<br/><br>
collector area and thus, the annual solar fraction, without increasing the<br/><br>
overproduction. Collector measurements were fed into a validated TRNSYS<br/><br>
collector model which estimates the solar fraction of the concentrating system and<br/><br>
also that of a traditional flat plate collector, both for domestic hot water production.<br/><br>
The system design approach aims to maximise the collector area until an annual<br/><br>
overproduction limit is reached. This is defined by a new deterioration factor that<br/><br>
takes into account the hours and the collector temperature during stagnation<br/><br>
periods. Then, the highest solar fraction achieved by both systems was determined.<br/><br>
The results show that, at 50° tilt in Lund, Sweden, the concentrating system<br/><br>
achieves 71% solar fraction using 17 m2 of collector area compared to 66% solar<br/><br>
fraction and 7 m2 of a flat plate collector system. Thus, it is possible to install 2.4<br/><br>
times more collector area and achieve a higher solar fraction using the load adapted<br/><br>
collector. However, the summer optical efficiency reduction was proven to be too<br/><br>
abrupt. If the reflector geometry is properly design, the load adapted collector can<br/><br>
be a competitive solution in the market if produced in an economical way.},
  author       = {Bernardo, Ricardo and Davidsson, Henrik and Karlsson, Björn},
  keyword      = {Concentrating Solar Thermal,CPC,Domestic Hot Water,High Solar Fraction},
  language     = {eng},
  number       = {3},
  pages        = {680--692},
  publisher    = {ARRAY(0x960a760)},
  series       = {Journal of Environment and Engineering},
  title        = {Performance Evaluation of a High Solar Fraction CPC-Collector System},
  url          = {http://dx.doi.org/10.1299/jee.6.680},
  volume       = {6},
  year         = {2011},
}