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International Journal of Mechanical Engineering and July - August- 2014 Computer Applications, Vol 2, Issue 4 ISSN 2320-6349 the ORC and then the cooling cycle. Some assumptions may not be in superheated state and also the condenser were made to carry out the analysis. It was assumed that the system is at steady state and pressure drops are neglected except in pumps, valves, and the turbine. Also, the kinetic and potential energies were neglected. Further assumptions for specific components are mentioned later where appropriate.[5] pressures are not high enough so a Vapour compression refrigeration is proposed which runs on the part of the electricity generated. A simple vapor compression refrigeration system consists of the following equipments: i) Compressor ii) Condenser iii) Expansion valve iv)Evaporatortor Figure 7 Organic rankine cycle The mass flow rate is constant throughout the ORC. The mass balance equations are M1=M2=M3=M4=M5 ORC Pump: The energy and exergy balance equations of the ORC pump are Wop = mo. (h2-h1) Exd,op = Wop + mo . (ex1-ex2) Where, the subscript op indicates the ORC pump. The isentropic efficiency of the pump is defined as ηp = Wop,is/Wop Where, Wop is defined as Wop,is = mo. (hs,2 – h1) Where the subscript ‘is’ refers to isentropic. ORC Turbine: The energy and exergy balance equations of the ORC turbine are Wot =mo .(h3 –h1) Exd,ot = -Wot + mo. (ex3 - ex4 ) Where the subscript ‘ot’ indicates the ORC turbine. The isentropic efficiency of the Turbine is ηturbine = Wot/Wot,is Heating Process The energy and exergy balance equations of the heating process are Qhp =mo .(h4–h5)=mhp .(hhp,2-hhp,1) Exd,hp=mhp.(exhp,1-exhp,2)+mo.(ex4 -ex5) Where the subscript ‘hp’ indicates the heating process. VAPOUR COMPRESSION REFRIGERATION SYSTEM MODEL: Figure 09 A refrigeration cycle simple V apour Compression Even there is an opportunity to employ an Absorption refrigeration cycle driven by the Waste heat generated by the condenser. The Organic rankine cycle radiation and Biomass fuel The heating Cogeneration, Ƞcog,h = Wnet+Qh/Qin www.ijmca.org Page 114 Work done by the compressor is calculated by the expression: W= (hc-hb) (adiabatic compression) The heat extracted at the low temperature = Heat transfer during the process A-B= refrigerating effect Q2= (hB-hA) Now, heat rejected to the condenser, Q1= w + Q2 = (hC–hB)+(hB-hA) =(hC -hA)=(hC -hD) The volumetric efficiency of a compressor η is defined as ratio between actual mass of vapor drawn at suction conditions and Theoritical mass that can be filled in the displacement volume. TRIGENERATION ASSESSMENT: The Electrical generator power Wg = ƞg.Wot The net work output from the power cycle = Wnet The net electrical efficiency ƞel = Wnet/Qin Where Qin is the total input heat to the system by SolarPDF Image | Modelling and Simulation of Solar-Biomass Hybrid Trigeneration using ORC-VCC
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