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Tecnologia/Technology Sotomonte et al. Organic Rankine Cycle Associated ... Table 2. Toxicity and flammability classification. Fluid Toluene (C7H8) Ethylbenzene (C8H10) Propylbenzene (C9H12) Octamethyltrisiloxane (MDM) Decamethyltetrasiloxane (MD2M) Dodecamethylpentasiloxane (MD3M) Dodecamethylcyclohexasiloxane (D6) Tb Tc Pc w (K) (K) (kPa) 384 591.8 4106 0.26323 409 617.2 3606 0.3027 432 638.32 3200 0.34513 425 564.09 1415 0.5297 467 599.4 1227 0.668 503 628.36 945 0.7218 518 645.78 961 0.7361 k1 ODP 0.03849 0 0.03994 0 0.02715 0 0.12634 0 0.03079 0 0.16431 0 0.09627 0 GWP(a) ASHRAE 34 - B3 - B3 - B2 - A2 - A2 - A2 - A2 (a) Apparently these fluids do not have a direct influence on global warming. However, they may have an indirect effect to trigger the formation of photochemical oxidants in the atmosphere. Energy Analysis The equations presented in this paper represent the mass and energy balances, for each subsystem that compose the power cogeneration cycle, taking into consideration the assumptions already presented. For the turbine (1-2): h−h ηis,t=1 2 (7) For the boiler: Q =Qevp T ηb Q T = m& B ⋅ L H V Net power output: (16) ( 1 7 ) (18) (19) W =(W ⋅η )−W h−h ntgb 1 2,s W = m& ⋅ ( h − h ) Global energy efficiency ηc =Wn +C QT ( 8 ) (9) (10) C = m& ⋅ ( h 3 − h 7 ) ⋅ C O P (11) For the condenser (7-4) Q c o n d = m& ⋅ ( h 3 − h 4 ) (12) For the pump (4-5): t12 For the regenerator (2-3) (5-6): h2 − h3 = h6 − h5 Eqs. (7-18) are the mathematical model for each component in the cycle. The energy efficiency is quantified as the ratio of useful energy output and total input energy in the system (Eq. 19), while electric efficiency don ́t takes into account the cooling power generation. Exergetic Analysis To evaluate the efficiency of a cogeneration system that produces cold and electric power; the First Law of Thermodynamics, states that, this is quantified as the ratio of useful energy output and total input energy in the system and is calculated by Eq. (19). Where is the net electrical power generated in the cycle, is the cooling power of the chiller and is the total energy supplied to the T3 =T2 −εr ⋅(T2 −T5) Where εr is effectiveness for the regenerator: For the chiller (3-7): v ⋅(P−P) ηis,b = 4 5 h5 − h4 4 (13) thermodynamic cycle. However, this analysis is not enough to identify energy losses and efficiencies of (14) these systems. Since; this principle only takes into account the quantity of energy, but not its quality, and the result is an overvaluation of the thermal component of the system. To overcome this problem, exergy ( can be (15) used as a quality and quantity measure of energy which involves the first and second thermodynamic laws, so an exergetic analysis is useful to identify and W = m& ⋅ ( h − h ) b54 For the evaporator (6-1): Q =m&⋅(h−h) 18 Engenharia Térmica (Thermal Engineering), Vol. 10 • No. 01 - 02 • June and December 2011 • p. 15-22 evp 16PDF Image | ORGANIC RANKINE CYCLE ASSOCIATED WITH AN ABSORPTION CHILLER FOR BIOMASS APPLICATIONS
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