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16 Pump efficiency Pump efficiency can influence the ORC performance to an important extent. More pump efficiency means that the pump is able to increase the fluid pressure before evaporator to higher degrees and less output power of ORC will be used for pump work. Higher pressure increase from pump means larger evaporator pressure that is connected to the pump and this is usually interesting (as already discussed). As a result it is important to choose a right pump for the system to gain desired amount of pressure after the pump. Some special pumps same as very accurate double diaphragm pumps minimize the leakage. Hence, in case of flammable or toxic fluids they are used to minimize the leakage and corresponding risk. Centrifugal pumps are used for high capacities. To scrutinize how the pump efficiency affects the ORC performance, different values for that is tested in the generated computer model. Equations 1, 6 and 7 are used to get the values for Pump work, and system net output work depending on pump efficiency. These data are needed to complete the cycle calculations. “m” stands for mass flow rate of fluid in cycle, h2 is fluid enthalpy after pump and h1 is fluid enthalpy before pump. η is pump efficiency, Wturbine shows the gained power from turbine and Wnet is total net work output. Equation 6: Equation 7 Then ORC thermal efficiency is achieved from equation 1. Table 11 from EES program shows that pump efficiency has influence on total ORC efficiency and output power. Better pump efficiency gives higher work output and ORC thermal efficiency. Table 11: Effect of pump efficiency on evaporator pressure and total cycle efficiency 60PDF Image | Exergy
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