Thermo-economic assessment of a hybrid tri-generation system making simultaneous use of biomass and solar energy
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(2020) 42:556
TECHNICAL PAPER
Thermo‑economic assessment of a hybrid tri‑generation system making simultaneous use of biomass and solar energy Suman Chattopadhyay1 · Sudip Ghosh1 Received: 23 January 2020 / Accepted: 21 September 2020 © The Brazilian Society of Mechanical Sciences and Engineering 2020
Abstract In this work, a tri-generation system is proposed that relies on a biomass-gasification-based externally fired gas turbine (EFGT) generator and an array of solar flat-plate collectors. A LiBr-water-based absorption cooling (VAR) system utilizes the waste heat of a 100-kW power generator as well as solar thermal energy of a 200 sq. m. solar collector to run a vegetable cold store of 200 metric ton capacity. A domestic water-heating system is also integrated with the unit that recovers low-temperature thermal energy to produce 150 tons of hot water daily. The power generator shows its maximum electrical efficiency of 27.5% at 1100 °C turbine inlet temperature and 10 pressure ratio. The maximum efficiency of solar collector is found to be 48%. The overall energetic efficiency of the tri-generation system varies in the range of 59 to 76%, while the overall exergetic efficiency varies in the range of 19 to 26.5%. The components of EFGT generator show high exergetic efficiencies, about 93% for air compressor and about 90% for GT, whereas the solar thermal system shows the poor exergetic performance of about 17%. Based on economic analysis of the proposed plant, the effective price of electricity is estimated as 0.068 USD/kWh without any subsidy, but considering 50% capital subsidy the price is estimated as 0.04 USD/kWh. The discounted payback period is found to be 10.8 years without any capital subsidy, but when 50% subsidy is considered, the payback period is reduced to 5 years. Keywords Biomass · Solar energy · Tri-generation · Absorption refrigeration · Economy · Exergy Abbreviations ABS Absorber AHX Air heat exchanger C Compressor CHX Combustor–heat exchanger COMB Combustor CON Condenser COP Coefficient of performance CP Circulating pump CRF Capital recovery factor CV Circulating valve DWH Domestic water heater ECOP Exergetic coefficient of performance Technical Editor: Monica Carvalho. * Sudip Ghosh [email protected] Suman Chattopadhyay [email protected] 1
EFGT Externally fired gas turbine EVP Evaporator FPC Flat-plate collector GASF Gasifier GEN Generator GT Gas turbine MT Metric ton NPV Net present value ORC Organic Rankine cycle PCF Plant capacity factor P Pump REV Refrigerant expansion valve SEST Solar energy storage tank SEV Solution expansion valve SHX Solution heat exchanger SI Spark ignition SP Solution pump VAR Vapor absorption refrigeration VCR Vapor compression refrigeration WGH Waste gas heater
Department of Mechanical Engineering, Indian Institute of Engineering Science and Technology, Shibpur, P.O. ‑ B. Garden, Howrah, West Bengal 711103, India
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Journal of the Brazilian Society of Mechanical Sc
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