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International Journal of Mechanical Engineering and July - August- 2014 Computer Applications, Vol 2, Issue 4 ISSN 2320-6349 The flat-plate collector design program (CoDePro) [4] is a program that can help engineers to design flat-plate solar collectors. It has been developed so that most details of the collector configuration can be specified. The program has been developed with the professional version of EES and beta-tested from its development level by solar engineers. CoDePro calculates the instantaneous efficiency, incident angle modifier coefficient, and stagnation temperatures. These calculations are related flat- plate solar collector tests. This program can be used to investigate the thermal effect of the choices of geometric parameters and materials. It should be noted that many functions used in the program have been developed by Solar Energy Laboratory, University of Wisconsin- Madison. The test conditions to calculate collector thermal performance are set. Input variables for test conditions are: - Intensity of incident solar radiation - Diffuse radiation proportion - Incident angle of beam radiation - Collector slope - Wind speed It is assumed that the area of absorber is the same as the aperture area, i.e., the frontal transparent area. Input variables are: - Overall Dimensions: Length, width, and thickness - Absorber Dimensions: Length and width Figure 2 The proposed system for Solar-Biomass Hybrid trigeneration system using ORC-VCC II. THERMODYNAMIC MODELLING OF THE SYSTEM PROPOSED SYSTEM: The proposed system consists of a Biomass boiler which generates steam by the combustion of low grade fuels such as wood residues, rice husk etc. In addition to the biomass boiler Solar flat plate collectors are also employed in order to utilize the solar energy as well as dependency on the biomass fuel. The prime mover in this system is the Organic rankine cyclic turbine which has Organic fluids like R134a, R123, R245fa, as the working fluids. A vapour compression cooling unit is coupled with the condenser of the turbine as well as it is driven by the electricity which is generated by the turbine. The biomass boiler can produce hot water as well as steam which runs by the combustion of Low Grade fuels such as rice husk, dried leaves etc. The hot water that is generated will be passed through a heat exchanger which in turn transfers heat to the organic fluid in different stages as economizer, Evaporator and Super Heater. The thermal energy produced in this system is calculated as the difference between the solar field production and the full- load needs. The fuel required to obtain the energy calculated with the previous consideration can be calculated assuming a performance of 88% for both systems at the full-load points. [6] The needs for auxiliary fuel are given by the following expression: M=( − )/ƞ∗ V f Where: • Qfl Heat needed for full/load production. • Qsl Heat collected in the solar field. SOLAR FLAT PLATE COLLECTOR MODEL: www.ijmca.org Page 112 Figure 1 Collector DimensionsPDF Image | Modelling and Simulation of Solar-Biomass Hybrid Trigeneration using ORC-VCC
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