Combine cooling heating and power generation using Organic Rankin Cycle and absorption chiller from coal-fired power plant waste heat
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Abstract
The waste heat, hot water boiler continuous blowdown with the temperature of 354.67 °C and 1.3 kg/s, from the 300-MW coal-fired thermal power plant of the Electricity Generating Authority of Thailand, has the potential to be used to generate electricity through the organic Rankin cycle (ORC). Although the cycle has low efficiency and high investing cost, this research aims to find the size, number, and cycle arrangement of ORC to increase the thermodynamics second law efficiency of the system. The dimensionless number in terms of "Figure of Merit" (FOM) was proposed for working fluids selection, cycle thermal efficiency evaluation, and cycle arrangement in various forms. In addition, the waste heat from the cycle was also studied to replace the split type of air conditioning system in the office by using an absorption chiller. The thermodynamics second law efficiency and the economic analysis of the system were studied. The results showed that R245fa was a functional refrigerant for ORC and suitable for boiler continuous blowdown. The ORC with a parallel connection arrangement can produce electricity from waste heat up to 220 kW, while the use of a single 200 kW ORC is a case of the low cost of generating electricity per unit in the form of Levelized Electricity Cost (LEC) at 1.39 THB/kWh. However, the waste heat leftover from the cycle is used to generate coolness by absorption chiller to replace the split type of air conditioning system in the office and the system's cost of generating electricity is decreased to only 1.30 baht/kWh.
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References
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