Thermodynamic modeling and performance analysis of a CCHP cycle employing geothermal and natural gas fuel energies

Nowadays, CCHP cycles receive more attention due to high efficiency and low pollution. In this regard, a novel CCHP cycle has been proposed. This cycle combines gas turbine, ORC, HRSG, single effect, and double effect absorption refrigeration cycles. The prime mover of the ORC is the geothermal energy and the waste energy of this is used to run the single effect absorption cycle. The gas turbine cycle is fueled by natural gas and the exhaust gases of this provide energy to operate HRSG and the double effect absorption cycle. The purpose of this CCHP is to reduce dependence on natural gas while increasing (or constant) power production. For thermodynamic modeling and validation, a code has been developed in the EES software. This cycle has 32.8 MW power production, 37.1MW heat generation, and 4.6 MW cooling capacity and the EUF of the cycle is 60.5%. In addition, the fuel consumed by the gas turbine cycle is reduced by 1.20% while keeping constant power production. Also, parametric studies show that the inlet temperature of the gas turbine has the most influence on the EUF.