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5.5.1.4 Domestic water heater The hot gases from the heat recovery heat exchanger enter the water heater to warm domestic hot water to 60 oC. Water enters this heater at a pressure and temperature of 3 bar and 20 oC, respectively. The energy balance for this component is given as follows: ̇ ( ) ̇( ) (5.47) 5.5.1.5 Organic Rankine Cycle The hot flue gases leaving the HRSG still have energy that can be utilized in a heat recovery vapor generator in an organic Rankine cycle to produce both cooling and electricity. Energy balances and governing equation for various components of ORC cycle (see Fig. 4.1) are provided below. 5.5.1.5.1 Ejector An ejector, which is a type of pump, uses the Venturi effect of a converging-diverging nozzle to convert the mechanical energy (pressure) of a motive fluid to kinetic energy (velocity), creating a low pressure zone that draws in and entrains a suction fluid. After passing through the throat of the injector, the mixed fluid expands and the velocity is reduced, recompressing the mixed fluids by converting velocity back to pressure. The motive fluid may be a liquid, steam or any other gas. The process occurring in the ejector (Fig. 5.4) is assumed to be steady state, one dimensional and adiabatic, and no work is done during the process. The velocities at the inlet and outlet of the ejector can be considered negligible [98]. For simplicity the effect of losses in the nozzle, mixing section and diffuser are accounted for by the efficiency for each section of the ejector. In this study, the primary motive flow enters the ejector at point 30, and the suction flow exits the evaporator at point 32. The process in the ejector includes the expansion of the high pressure prime motive flow through the nozzle, mixing with the low pressure secondary flow in the mixing section at constant pressure, and diffusing to the outlet of the ejector (point 33) while the kinetic energy of the mixture is converted to the pressure head. An important parameter for the secondary flow is the entrainment ratio, defined as ̇ ̇ (5.48) In the nozzle section in Fig. 5.4, the inlet velocity of primary flow Vpf,n1 is negligible, so the exit enthalpy and velocity of primary flow can be expressed as 73PDF Image | Energy Systems for Multigeneration Purposes
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