Energy Systems for Multigeneration Purposes

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Energy Systems for Multigeneration Purposes ( energy-systems-multigeneration-purposes )

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of the system. The low pressure line leaving the generator has adequate energy for use in a domestic water heater that provides hot water at 50oC. Furthermore, flue gases leaving the HRSG at point C enter a heat recovery vapor generator to provide electricity and cooling. Since the flue gases have a low temperature, around 160oC, an ORC cycle is used, consisting of an ORC turbine to generate electricity and a steam ejector to provide the system cooling load. These flue gases enter the HRVG at point d to produce saturated vapor at point 29, which leaves the HRVG at point 28. Saturated vapor at point 29 enters the ORC turbine and work is produced. The extraction turbine and ejector play important roles in this combined cycle. The high pressure and temperature vapor is expanded through the turbine to generate power, and the extracted vapor from the turbine enters the supersonic nozzle of the ejector as the primary vapor. The stream exiting the ejector (point 33) mixes with turbine exhaust (point 31) and is cooled in the preheater and enters the condenser where it becomes a liquid by rejecting heat to the surroundings. Some of the working fluid leaving the condenser enters the evaporator after passing through the throttle valve (point 39), and the remainder flows back to the pump (point 37). The ORC pump increases the pressure (point 40), and high pressure working fluid is heated in the preheater (point 41) before entering the HRVG. The low pressure and temperature working fluid after the valve (point 39) enters the evaporator, providing a cooling effect for space cooling. Some of the electricity is considered for residential applications while some directly drives a PEM electrolyzer to produce hydrogen. In this analysis, waste heat is used as a heat source to stimulate the multigeneration system and R123 is selected as the working fluid because it is a non-toxic, non-flammable and non-corrosive refrigerant with suitable thermophysical characteristics. 4:2 System II: Biomass based multigeneration system Renewable energy is a source of energy which comes from natural resources such as sunlight, wind, rain, tides, waves, geothermal heat and biomass. These are naturally replenished when used. Biomass, as a renewable energy source, is biological material from living, or recently living, organisms [77]. 50

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