Optimal Condition of Finite Number of Heat-Recovery Cycles for a Non-Isothermal Heat Source

Year 2020, , 1 - 11, 29.02.2020

Keisuke Takeshita , Yoshiharu Amano

https://doi.org/10.5541/ijot.633485

Abstract

This study analyzes a
temperature condition that produces maximal power from a non-isothermal heat
source under a finite number of heat-recovery thermodynamic cycles. Some previous
studies have theoretically analyzed a system utilizing thermal energy from heat
sources under multiple thermodynamic cycles assuming a constant heat-source
temperature. However, many heat sources for heat-recovery thermodynamic cycles
are non-isothermal, where the temperature changes considerably during heat
exchange with the cycles. Therefore, it is necessary to consider the
temperature change of the heat source. First, a condition that maximizes the
power generated by a combination of single/multiple Carnot cycles from
constant-specific-heat heat sources is analyzed, and the optimal temperature is
derived analytically. Subsequently, simulations of the Rankine cycle and
several patterns of the Kalina cycle are compared with those of the analytical
model. These comparisons reveal that the proposed model effectively estimates
the condition for heat-recovery cycles that produce maximal power from a non-isothermal
heat source. Using the proposed method, the required number of cycles and their
operating conditions under a given heat source condition are estimated, without
any information about cycle configurations, types of working fluids, and
iteration of simulation calculation under inappropriate conditions, and a systematic
exploration of the optimal system is ensured. 

Keywords

Rankine cycle, Kalina cycle, Optimization, Maximal power, Non-isothermal heat source

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