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.

scholarly journals Application of Solar Thermal Energy for Medium Temperature Heating in Automobile Industry

2017 ◽  
Vol 7 (2 (S)) ◽  
pp. 19
Author(s):  
Anagha Pathak ◽  
Kiran Deshpande ◽  
Sandesh Jadkar
Keyword(s):  
Solar Energy ◽  
Thermal Energy ◽  
Automobile Industry ◽  
Storage Tank ◽  
Fossil Fuel ◽  
Heating System ◽  
Hot Water ◽  
Solar Thermal ◽  
Solar Thermal Energy ◽  
Medium Temperature

There is a huge potential to deploy solar thermal energy in process heat applications in industrial sectors. Around 50 % of industrial heat demand is less than 250 °C which can be addressed through solar energy. The heat energy requirement of industries like automobile, auto ancillary, metal processing, food and beverages, textile, chemical, pharmaceuticals, paper and pulp, hospitality, and educational institutes etc. can be partially met with solar hybridization based solutions. The automobile industry is one of the large consumers of fossil fuel energy in the world. The automobile industry is major economic growth driver of India and has its 60 % fuel dependence on electricity and remaining on oil based products. With abundant area available on roof top, and need for medium temperature operation makes this sector most suitable for substitution of fossil fuel with renewable solar energy. Auto sector has requirement of heat in the temperature range of 80-140 oC or steam up to 2 bar pressure for various processes like component washing, degreasing, drying, boiler feed water preheating, LPG vaporization and cooling. This paper discusses use of solar energy through seamless integration with existing heat source for a few processes involved in automobile industries. Integration of the concentrated solar thermal technology (CST) with the existing heating system is discussed with a case study for commonly used processes in auto industry such as component washing, degreasing and phosphating. The present study is undertaken in a leading automobile plant in India. Component cleaning, degreasing and phosphating are important processes which are carried out in multiple water tanks of varying temperatures. Temperatures of tanks are maintained by electrical heaters which consumes substantial amount of electricity. Non-imaging solar collectors, also known as compound parabolic concentrators (CPC) are used for generation of hot water at required process temperature. The CPC are non-tracking collectors which concentrate diffuse and beam radiation to generate hot water at required temperature. The solar heat generation plant consists of CPC collectors, circulation pump and water storage tank with controls. The heat gained by solar collectors is transferred through the storage tank to the process. An electric heater is switched on automatically when the desired temperature cannot be reached during lower radiation level or during non-sunny hours/days. This solar heating system is designed with CPC collectors that generate process heating water as high as 90OC. It also seamlessly integrates with the existing system without compromising on its reliability, while reducing electricity consumption drastically. The system is commissioned in April, 2013 and since then it has saved ~ 1,75,000 units of electricity/year and in turn 164 MT of emission of CO2 annually.

Preheating Metal Scrap in Foundries Using Solar Thermal Energy

2015 ◽  
Vol 813-814 ◽  
pp. 760-767 ◽  
Author(s):  
J. Selvaraj ◽  
Chandra C. Jawahar ◽  
Khushal A. Bhatija ◽  
Saalai Thenagan
Keyword(s):  
Solar Energy ◽  
Energy Conservation ◽  
Greenhouse Gases ◽  
Environmental Protection ◽  
Thermal Energy ◽  
Solar Thermal ◽  
Solar Thermal Energy ◽  
Metal Scrap ◽  
Parabolic Trough ◽  
Preheating Temperature

The present scenario of energy conservation has witnessed many innovative and eco-friendly techniques and one such area where there is a necessity to conserve energy is foundries. Foundries also pollute the atmosphere with greenhouse gases contributing to 296143037.6 metric tons annually. The proposed technique in this paper aims at reducing the energy utilized in melting the scrap material at foundries by solar thermal energy. In the methodology proposed, solar energy is concentrated onto the scrap placed on a receiving platform using a parabolic trough and heats it up so that the heated scrap takes lesser energy to melt. The experiments resulted in preheating temperature of 100 °C when placed on a receiving platform and 110°C when copper shots are used to conduct heat from receiver to the scrap. This translates to energy conservation of 6%. This eco-friendly technique when adopted can result in substantial savings in consumption and environmental protection.

scholarly journals Realization of a Based Concrete Thermal Storage Module used with a Medium Temperature Parabolic Trough Solar Collector

2015 ◽  
Vol 10 (1) ◽  
Keyword(s):  
Solar Energy ◽  
Solar Collector ◽  
Thermal Characteristic ◽  
Operation Time ◽  
Thermal Storage ◽  
Solar Irradiation ◽  
Parabolic Trough ◽  
Night Time ◽  
Medium Temperature ◽  
Parabolic Trough Solar Collector

Thermal solar energy has been considered for years as one of the most promising candidate for the substitution of the conventional systems providing a clean and sustainable energy solution. However, the intermittent aspect of the solar irradiation received by the earth surface presented a major obstacle for the exploitation and the integration of such technology in various applications. In order to avoid this barrier a thermal storage system for solar energy became a necessity especially for the concentrated solar power technologies. This paper shows the work carried out to determine the thermal behavior of a concrete storage unit for medium temperature applications. The experimental thermal storage module using concrete was realized and tested in order to be integrated in an advanced setup to a solar cooling installation powered by a parabolic trough solar collector. The thermal characteristic of the used concrete matrix was determined. The thermal storage module was tested under the same thermal conditions provided by the solar collectors. The temperature variations of the module during the charging and the heat loss during the night time were investigated. The test results showed some interesting thermal inertia of the concrete based storage module. The integration of the proposed storage module to the solar loop of the cooling installation will lead to extend the operation time after sunset and to decrease time lasted by the solar parabolic trough collector to reach the required operational temperature in the morning.

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.

Simulation of the parabolic trough solar energy generation system with Organic Rankine Cycle

2012 ◽  
Vol 97 ◽  
pp. 630-641 ◽  
Author(s):  
Ya-Ling He ◽  
Dan-Hua Mei ◽  
Wen-Quan Tao ◽  
Wei-Wei Yang ◽  
Huai-Liang Liu
Keyword(s):  
Solar Energy ◽  
Organic Rankine Cycle ◽  
Rankine Cycle ◽  
Energy Generation ◽  
Generation System ◽  
Parabolic Trough

scholarly journals Design of automation control thermal system integrated with parabolic trough collector based solar plant

2021 ◽  
pp. 218-218
Author(s):  
Anbuchezhian Nattappan ◽  
Suganya Priyadharshini Ganesan ◽  
Velmurugan Thiagarajan ◽  
Krishnamoorthy Ranganathan
Keyword(s):  
Power Plant ◽  
Solar Energy ◽  
Solar Thermal ◽  
Thermal System ◽  
Solar Concentrator ◽  
Parabolic Trough ◽  
Parabolic Trough Collector ◽  
Automation Control ◽  
Solar Thermal System ◽  
Noisy Condition

This paper presents enhanced design for Automation control of processes involved in a solar system which utilizes programmable logic controller to automate tracking system for obtaining maximum solar radiation. Three areas are involved in this proposed multi area system where first and second area considers solar power plant with thermal system based parabolic trough collector with fixed solar isolation and random isolation of solar energy whereas third area comprises of solar thermal system with dish Stirling realistic unit. Energy efficiency can be increased by using solar concentrator along with Stirling engine. Optimization of gain of the controller is by utilizing crow search novel algorithm. Crow search algorithm is an optimization technique, which provides better performance at complex time varying noisy condition and time in-varying noisy condition. The Proposed controller is evaluated by obtaining the optimized parameters of the system whose comparison is done by operating proposed controller with & without renewable sources of energy thereby revealing better performance for both conditions. Testing is done in different areas with fixed solar isolation and random stisolation of solar energy involved in solar thermal power plant based on parabolic trough collector. Gain and parameters of the controller of the solar power plant are optimized by utilizing automation for operation of solar concentrator with parabolic Trough collector. Data acquisition and monitoring is done by human machine interface (HMI) in order to report safe operation. The Simulation results of integrated solar thermal system involving dish Stirling with parabolic trough collector, shows that dynamic response of the proposed controller operating with renewable solar energy is better than that of non-renewable energy source.

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