| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 1734624 | Energy | 2011 | 8 Pages |
In this paper, thermoeconomic optimization and exergy analysis are applied to a CO2/NH3 cascade refrigeration cycle. Cooling capacity, ambient temperature and cold space temperature are constraints of the optimization procedure. Four parameters including condensing temperature of ammonia, evaporating temperature of carbon dioxide, condensing temperature of carbon dioxide and temperature difference in the cascade condenser are chosen as decision variables. The objective function is the total annual cost of the system which includes costs of input exergy to the system and annualized capital cost of the system. Input exergy to the system is the electricity consumption of compressors and fans, and the capital cost includes purchase costs of components. Results show that, optimum values of decision variables may be found by trade-off between the input exergy cost and capital cost. Results of the exergy analysis for each of the system components in the optimum state are also given.
Research highlights► In this paper, we introduce thermoeconomic optimization method for optimization the cascade refrigeration system for the first time. ► Results of optimization shows improvement in total annualized cost with respect to our base case. ► The proposed algorithm consists of thermal design of the heat exchangers. So, the method may be used to optimize the heat exchangers along with the cycle.
