Exergy Guided Optimization Model for Decarbonized Solar Districts
Keywords:Exergy Rationality, Nearly-Avoidable CO2 Emissions Responsibility, Heat Pipe Radiator, Advanced solar PVT, Nearly-Zero Carbon Building
An exergy-based model is developed for optimum low-temperature solar and waste heat utilization in a district energy system with solar prosumer buildings. The objective is to minimize CO2 emissions responsibility due to exergy mismatches between low-exergy thermal gain versus high electrical exergy demand for district circuit pumping and existing space heating and cooling equipment. The paper shows that nearly-avoidable CO2 emission responsibilities are directly related to the exergy mismatches. The exergybased model is applied to a case study about a solar prosumer house in the Netherlands. Results show that solar districts with central thermal storage may not be exergy rational, having avoidable CO2 emissions responsibility, unless advanced solar PVT systems, moderate-temperature heating, cooling equipment with heat pipes, onsite thermal storage, and heat pumps with COP greater than ten are implemented.
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