Freeze-Protection Heat Loss From a Parabolic-Trough Solar System

1984 ◽  
Vol 106 (2) ◽  
pp. 233-234
Author(s):  
E. K. May
Keyword(s):  
Solar System ◽  
Solar Energy ◽  
Heat Loss ◽  
Thermal Energy ◽  
Cold Climate ◽  
Parabolic Trough ◽  
Energy Delivery ◽  
Freeze Protection

The thermal energy required to prevent the freezing of water in an industrial parabolic trough solar system is quantified. Even in a cold climate, such as that of Denver, Colorado, thermal losses can be much less than 1 percent of the solar energy delivery.

Autonomous Active Solar Energy Systems for Heat Supply in Housing and Communal Services

2021 ◽  
pp. 51-55
Author(s):  
Pavel A. Khavanov
Keyword(s):  
Solar Energy ◽  
Electric Power ◽  
Thermal Energy ◽  
Heat Supply ◽  
Alternative Energy ◽  
Energy Systems ◽  
Heat Pumps ◽  
Cold Climate ◽  
Small Scale ◽  
Water Heating

Energy saving in small-scale heat power engineering is directed to increasing the efficiency of using fossil energy carriers, electric power, and their wider replacement with alternative sources in housing and communal complex. The practical use of active solar energy systems, both photovoltaic and with direct water heating, has found widespread use. At the same time, the specificities of these systems deployment are caused by climatic and technical conditions of their application. For countries found in climatic zones with temperate and cold climate, water heating installations design is most rational when used seasonally. Low coolant potential, heat supply frequency in active solar energy systems, linked to seasonality of their operation, daytime and weather require several technical solutions. For example, solutions with the use of other equipment in form of thermal energy accumulators, heat pumps and other equipment, which in any case must be combined with a traditional source of thermal energy using fossil fuels or electric power, performing the functions of both other and emergency source of heat energy. Capacity reserving of alternative energy sources is most efficient and least energy-consuming when conducting with heat sources using gaseous or degasified fuel. The use of electric power for heat supply purpose, with few capital investments, requires from a developer significant installed capacities of heat source with a low efficiency for primary fuel. In the article one considers thermal schemes of autonomous heat supply installations for objects using modern condensing boilers of low power and along them various heat cumulating devices, supplying full year operation of equipment at heat supply facilities to get the highest efficiency of energy use.

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 Optimal forecasting of thermal conductivity and storage in parabolic trough collector using phase change materials

2021 ◽  
Vol 9 (2) ◽  
Author(s):  
P. Muruganantham ◽  
◽  
Balaji Dhanapal ◽  
Keyword(s):  
Solar Energy ◽  
Phase Change ◽  
Heat Loss ◽  
Thermal Efficiency ◽  
Phase Change Materials ◽  
Storage System ◽  
Solar Collectors ◽  
Parabolic Trough ◽  
Fluid Medium ◽  
Parabolic Trough Collector

Renewable energy is one of the cleaner energy generation strategies practiced all over the world to reduce environmental impacts and waste based on current sustainability in economic practices. Solar energy is one kind of renewable sources of energy practiced for different application. The thermal storage system in solar energy is one of the least practiced methods in research, and the utilization of solar energy in the thermal application is attaining higher responses and is quite possible. In this paper, solar heat generation is attained by solar parabolic trough collector using phase change materials. The ideology behind this research is to develop a thermal energy storage system using solar collectors and phase change materials. A composition mixture of MgCl2. 6H2O phase change materials used as the fluid medium in trough collector and thermal efficiency of the material is evaluated. For effective optimization, an imperialist competitive algorithm is used for optimizing the thermal efficiency of the solar collectors. The thermal efficiency of the collector is numerically experimented in the running platform of Mat Lab and executed in terms of heat gain, heat loss, and thermal efficiency of the parabolic trough collector, respectively. The efficiency of the proposed framework is 85%, and the current framework just has 80% efficiency. The heat loss in the proposed framework is lower than that of the current system, distinguished as 4200 W and 4520 W, respectively. It is shown from the research study that the proposed PCM composition is an optimal method for generating heat energy in solar parabolic trough collectors.

A Comprehensive Review on Solar Parabolic Trough Collector

2018 ◽  
Vol 4 (10) ◽  
pp. 6
Author(s):  
Kripa Shankar Pathak, ◽  
Ravindra Mohan
Keyword(s):  
Renewable Energy ◽  
Solar Energy ◽  
Visible Light ◽  
Thermal Performance ◽  
Thermal Energy ◽  
Parabolic Trough ◽  
Comprehensive Review ◽  
Parabolic Trough Collector ◽  
Maximum Extraction ◽  
Intense Research

Solar energy is one among the freely available clean forms of renewable energy. Many technologies have been developed in India for extracting energy from assorted renewable energies, but the maximum extraction of thermal energy from solar energy is the most promising challenge. This paper focuses on the performance and efficiency of solar parabolic trough collector. In this paper, the design stages of a solar parabolic trough collector are presented. The sunlight collected is split by a cold mirror into visible light and inferred rays. The visible light and IR are used for day lighting and heating generation respectively. The receiver absorbs the incoming radiations and transforms them into thermal energy. Improving the performance of solar collectors has been recently a subject of intense research because of its advantages such as a decrease in the size and cost of systems and an increase in the thermal performance.

Design of Volumetric Solar Flow Receivers

2010 ◽  
Author(s):  
Ananthanarayanan Veeraragavan ◽  
Andrej Lenert ◽  
Salem Al-Dini ◽  
Evelyn N. Wang
Keyword(s):  
Solar Energy ◽  
Heat Loss ◽  
Analytical Model ◽  
Thermal Energy ◽  
Electrical Power ◽  
Heat Losses ◽  
Solar Thermal ◽  
Fluid Temperature ◽  
Thermal Systems ◽  
Bulk Fluid

The development of efficient solar thermal receivers has received significant interest for thermal energy to electrical power conversion and heating applications. Volumetric receivers, where the incoming solar radiation is absorbed in a fluid volume, have advantages over state-of-the-art surface absorbers owing to the reduced heat losses at the surface. To efficiently distribute and store the thermal energy in the volume, nanoparticles can be suspended in the liquid medium to scatter and absorb the incoming radiation. In such systems, however, compact models are needed to design and optimize the performance. In this paper, we present an analytical model that can be used to perform parametric studies to investigate the effect of heat loss, particle distribution, and flow rate on receiver efficiency. The analytical model was formulated by modeling the suspended nanoparticles as embedded heat sources. The heat equation was solved with the surface heat losses modeled using convective losses based on Newton’s law of cooling. The analytical solution provides a convenient tool to predict two-dimensional temperature profiles for a variety of heat loss and inlet fluid temperature conditions. The efficiency of the receiver is defined as the ratio of the amount of thermal energy transported by the fluid to the total incident solar energy. For very large lengths the thermal energy carried by the fluid reaches a maximum steady value as the amount of heat loss equals the incident solar energy. The model can be used to estimate the approximate receiver lengths required to achieve near peak bulk fluid temperature. The results from this study will help guide experimental design, as well as practical flow receivers for solar thermal systems. Predictions made on a channel of 1mm depth with a solar concentration of 1 show that there exists a maximum system efficiency of 0.3373 for a dimensionless receiver length of 1.66.

Development of an Innovative Code for the Design of Different Parabolic Trough Solar Fields

2009 ◽  
Author(s):  
Ennio Macchi ◽  
Giampaolo Manzolini ◽  
Paolo Silva
Keyword(s):  
Solar Energy ◽  
Energy Demand ◽  
Working Fluid ◽  
Fluid Temperature ◽  
Parabolic Trough ◽  
High Solar Radiation ◽  
Power Block ◽  
The Usa ◽  
Solar Field ◽  
Steam Cycle

The role of renewable energies and in particular solar energy could be fundamental in future scenarios of worldwide increase of energy demand: thermodynamic solar energy can play an important role in country with high solar radiation. This paper discusses the development and testing of an innovative code for the prediction of thermodynamic performances at nominal conditions and the estimation of costs of the whole plant, for different parabolic trough solar fields. The code allows a preliminary design of the solar field lay-out, the sizing of the main components of the plant and the optimization of the steam cycle. The code, named PATTO (PArabolic Trough Thermodynamic Optimization), allows to separately calculate the thermal efficiency of (i) parabolic trough systems in commerce as well as (ii) combination of components of various commercial systems, in order to exploit different technology solutions: combination of mirrors, receivers and supports. Using the selected parabolic troughs, the plant configuration is then completed by connecting pipes, heat exchangers, the steam cycle, and storage tanks. The code is also flexible in terms of working fluid, temperature and pressure range. Regarding the power block, a conventional steam cycle with super-heater and re-heater sections and up to seven regenerative bleedings is adopted. It is possible to use also simpler configuration as without re-heater or with less regenerative bleedings. Moreover, thanks to simple or sophisticated economic correlations depending on available data, the code calculates the overall investment cost for the considered solar field and the power block. The code performs steady state analysis at nominal conditions, while future developments are planned regarding part load analysis and transient simulations. The model is tested towards real applications and reference values found in literature; in particular, focusing on SEGS VI plant in the USA. Detailed results showing code potentiality, are presented in terms of solar field and power block energy balances, plant auxiliaries, piping and economic analysis.

Performance Enhancement of Solar Parabolic Trough Collector Using Intensified Ray Convergence System

2017 ◽  
Vol 867 ◽  
pp. 191-194
Author(s):  
Anbu Manimaran Sukanta ◽  
M. Niranjan Sakthivel ◽  
Gopalsamy Manoranjith ◽  
Loganathan Naveen Kumar
Keyword(s):  
Renewable Energy ◽  
Solar Energy ◽  
Performance Enhancement ◽  
Solar Flux ◽  
Parabolic Trough ◽  
Parabolic Trough Collector ◽  
Chrome Coating ◽  
Convergence System ◽  
And Performance

Solar Energy is one of the forms of Renewable Energy that is available abundantly. This work is executed on the enhancement of the performance of solar parabolic trough collector using Intensified Ray Convergence System (IRCS). This paper distinguishes between the performance of solar parabolic trough collector with continuous dual axis tracking and a fixed solar parabolic trough collector (PTC) facing south (single axis tracking). The simulation and performance of the solar radiations are visualized and analyzed using TRACEPRO 6.0.2 software. The improvement in absorption of solar flux was found to be enhanced by 39.06% in PTC using dual axis tracking, absorption of solar flux increases by 52% to 200% in PTC receiver using perfect mirror than PTC using black chrome coating.

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