0
research-article

Diminution of useful solar gains by capacitive thermal losses and thermal piping losses in a solar process heat plant with parabolic trough collectors in Switzerland

[+] Author and Article Information
Jana Möllenkamp

SPF Institute for Solar Technology, HSR University of Applied Sciences Rapperswil, 8640 Rapperswil, Switzerland
jana.moellenkamp@spf.ch

Mercedes H. Rittmann-Frank

SPF Institute for Solar Technology, HSR University of Applied Sciences Rapperswil, 8640 Rapperswil, Switzerland
mh.rittmann-frank@spf.ch

Andreas Häberle

SPF Institute for Solar Technology, HSR University of Applied Sciences Rapperswil, 8640 Rapperswil, Switzerland
Andreas.haeberle@spf.ch

Thomas Beikircher

ZAE Bayern: Bavarian Center for, Applied Energy Research, 85748 Garching, Germany
thomas.beikircher@zae-bayern.de

Wolfgang Schoelkopf

ZAE Bayern: Bavarian Center for, Applied Energy Research, 85748 Garching, Germany
wolfgang.schoelkopf@zae-bayern.de

1Corresponding author.

ASME doi:10.1115/1.4042456 History: Received June 28, 2018; Revised November 29, 2018

Abstract

Process heat represents a major share of final energy consumption in the industrial sector and can partly be provided by solar thermal systems. To date, there has been little experience with solar heat plants for industrial processes operating at medium temperature level (100 - 250 °C). This paper focuses on the analysis of reduced solar gains by heating-up processes (capacitive thermal losses) in a parabolic trough collector field of 627m^2 aperture area providing solar heat for a Swiss dairy at 120 °C: Heating-up thermal masses is experimentally quantified by a new method using existing temperature sensors. The unused solar thermal gains of heating-up periods amount to 18% of possible useful solar gains in 2014. In winter months this share can reach 50 %. An intermediate storage or smaller heat capacities should be considered to reduce these losses. Also thermal losses of the piping system during full-operation are analysed. With properly installed insulation they are theoretically proven to be below 3% of useful solar gains. The analyses are based on the evaluation of highly time-resolved measurements of one year.

Copyright (c) 2019 by ASME
Your Session has timed out. Please sign back in to continue.

References

Figures

Tables

Errata

Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging and repositioning the boxes below.

Related Journal Articles
Related eBook Content
Topic Collections

Sorry! You do not have access to this content. For assistance or to subscribe, please contact us:

  • TELEPHONE: 1-800-843-2763 (Toll-free in the USA)
  • EMAIL: asmedigitalcollection@asme.org
Sign In