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

2019 ◽  
Vol 141 (4) ◽  
Author(s):  
Jana Möllenkamp ◽  
Mercedes H. Rittmann-Frank ◽  
Andreas Häberle ◽  
Thomas Beikircher ◽  
Wolfgang Schölkopf
Keyword(s):  
Industrial Sector ◽  
Solar Thermal ◽  
Piping System ◽  
Parabolic Trough ◽  
Medium Temperature ◽  
Time Resolved ◽  
Solar Heat ◽  
Process Heat ◽  
Temperature Levels ◽  
Heating Up

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 levels (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 with an aperture area of 627 m2 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%. Preserving the hot fluid content in an ideally insulated storage in the evening could avoid heating-up in the morning and reduce capacitive thermal losses by 38%. With properly installed insulation thermal losses of the piping system during operation 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.

Evaluating the Market Potential of Concentrated Solar Thermal Technology for Different Applications in the MENA Region

2021 ◽  
pp. 1-49
Author(s):  
Louay Elmorsy ◽  
Sarah Hamdy ◽  
Tatiana Morosuk ◽  
George Tsatsaronis
Keyword(s):  
Financial Incentives ◽  
Private Investment ◽  
Industrial Sector ◽  
Regulatory Framework ◽  
Market Potential ◽  
Solar Thermal ◽  
Local Context ◽  
Mena Region ◽  
Solar Heat

Abstract Missing financial and regulatory frameworks lead to low development and stagnating costs of concentrated solar thermal technology. Nevertheless, in locations with high direct normal irradiance such as the MENA region, the technology could become competitive, being promised a learning rate of 10-20 %, and boost local economies. This study aims to identify potential business cases and evaluate the increased technology's investment likelihood in the region, focusing on Egypt. A thorough market assessment on the structure, regulatory framework, demand, and potential revenues was conducted for the power and process heating sector. A SWOT analysis was performed considering the local context and competing technologies. Egypt was shown to offer local manufacturing potential, regulatory framework and renewable energy strategies, facilitating the technology's deployment. Moreover, the market is already open for private investment and selected international funds are directed towards CSP development. High initial technology cost, subsidized fuel and electricity prices for industry, alongside lack of long-term financial incentives and awareness of potential long-term benefits for the economy were identified as the most significant threats. High solar heat demand for industrial processes and large potential for concentrated solar heat application were identified. Yet, the market is decentralized and the processes are very diverse, moreover retrofitting may pose risks alongside the high upfront investment and additional land costs, which makes concentrated solar heat applications less attractive for the Egyptian industrial sector. Hence, for concentrated solar technology deployment, financial incentives and a regulatory framework specifically directed towards the technology would be necessary.

Selection of Working Fluids for Medium Temperature Heat Pipes Used in Parabolic Trough Solar Receivers

2013 ◽  
Vol 860-863 ◽  
pp. 62-68
Author(s):  
Yun Liu ◽  
Hong Zhang
Keyword(s):  
Solar Energy ◽  
System Optimization ◽  
Solar Thermal ◽  
Generation System ◽  
Parabolic Trough ◽  
Thermal Generation ◽  
Medium Temperature ◽  
Working Fluids ◽  
Potential System ◽  
Material Requirement

According to the methods of focusing,the solar thermal generation can be classified to tower system,parabolic trough system and dish-stirling system. The parabolic solar thermal generation system is an important type of solar thermal utilization. Compared to tower and dish-stirling system,the parabolic trough system has many advantages such as the small concentration ratio,the simple process,the low material requirement and the simple tracking device because of many concentrator on-axis tracking. The parabolic trough system is the lowest cost, least close to commercialization,larger potential system optimization,and the most suitable to large operation in this three thermal generation systems [1,. The parabolic trough system is composed of concentrator and receiver,and the receiver is the key component that uses solar energy to heat working fluids in receiver. Therefore,the key problem is how to make the solar energy transfer to subsequent generation system efficiently and stably.

Performance of a Solar Thermal Parabolic Trough Concentrator for Industrial Process Heat (IPH) Applications in Egypt

Solar Energy ◽  
2003 ◽  
Author(s):  
M. Fatouh ◽  
M. Nabil ◽  
E. Mahmoud ◽  
M. K. Mahmoud
Keyword(s):  
Energy Demand ◽  
Industrial Process ◽  
Solar Thermal ◽  
Heat Transfer Fluid ◽  
Inlet Temperature ◽  
Renewable Energy Resources ◽  
Parabolic Trough ◽  
Industrial Sectors ◽  
Local Manufacturing ◽  
Process Heat

In Egypt, surveying the industrial sectors revealed that in the last few years the industrial process heat (IPH) consumed more than 60% of the annual industrial energy demand, of which about 50% is in the temperature range from 80 to 150°C. Among different renewable energy resources, it is found that solar thermal technologies, especially parabolic trough concentrators (PTC) are more convenient for the IPH applications. Thus, the present work deals with studying the main design and performance characteristics that enable the local manufacturing of a PTC for IPH applications in the range of 80 to 150°C in Egypt. It includes theoretical and experimental parts. The theoretical part was conducted using a specially developed computer program based on the energy balance equations of each component of PTC. The experimental part was carried out on a test rig designed and constructed using mainly local manufacturing capabilities. Effects of concentration ratio, radiation, inlet temperature and mass flow rate of the heat transfer fluid, glass envelope diameter and top thermal insulation on the theoretical and experimental performance of PTC are graphically reported. Finally, a brief discussion of the local manufacturing possibilities as well as some identified barriers that can hinder promotion of the technology in a very suitable and huge market like Egypt is presented in this paper.

REVIEW ON SOLAR THERMAL TECHNOLOGIES FOR LOW AND MEDIUM TEMPERATURE INDUSTRIAL PROCESS HEAT

2015 ◽  
Vol 23 (1) ◽  
pp. 25-44
Author(s):  
Nofri Yenita Dahlan ◽  
◽  
Mohd Fauzi Ismail ◽  
Keyword(s):  
Industrial Process ◽  
Solar Thermal ◽  
Medium Temperature ◽  
Process Heat

scholarly journals Energetic and Financial Optimization of Solar Heat Industry Process with Parabolic Trough Collectors

Designs ◽  
2018 ◽  
Vol 2 (3) ◽  
pp. 24 ◽  
Author(s):  
Evangelos Bellos ◽  
Ilias Daniil ◽  
Christos Tzivanidis
Keyword(s):  
Storage Tank ◽  
Net Present Value ◽  
Payback Period ◽  
Solar Collectors ◽  
Present Value ◽  
Parabolic Trough ◽  
Climate Conditions ◽  
Solar Heat ◽  
Process Systems ◽  
Temperature Levels

The objective of this work is the investigation of a solar heat industry process with parabolic trough solar collectors. The analysis is conducted for the climate conditions of Athens (Greece) and for five load temperature levels (100 °C, 150 °C, 200 °C, 250 °C, and 300 °C). The examined configuration combines parabolic trough solar collectors coupled to a storage tank and an auxiliary heat source for covering the thermal need of 100 kW. The solar thermal system was optimized using the collecting area and the storage tank volume as the optimization variables. There are three different optimization procedures, using different criteria in every case. More specifically, the solar coverage maximization, the net present value maximization, and the payback period minimization are the goals of the three different optimization procedures. Generally, it is found that the payback period is between five and six years, the net present value is between 500–600 k€, and the solar coverage is close to 60%. For the case of the 200 °C temperature level, the optimum design using the net present value criterion indicates 840 m2 of solar collectors coupled to a storage tank of 15.3 m3. The optimization using the solar cover indicates the use of 980 m2 of solar collectors with a tank of 28 m3, while the payback period minimization is found for a 560 m2 collecting area and an 8-m3 storage tank volume. The results of this work can be used for the proper design of solar heat industry process systems with parabolic trough collectors.

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