Abstract
Background
Organic Rankine cycle (ORC) has been extensively applied to electricity generation by utilizing low grade residual heat.
Methods
A cascaded lithium bromide refrigeration cycle/ ORC to recover waste heat is proposed and investigated in this paper. Several critical parameters in terms of refrigeration temperature, the types of organic working medium, ORC high pressure, turbine discharge pressure, and segment temperature are studied to design and optimize the proposed system. Furthermore, the proposed system is compared with the conventional ORC that utilizes the same heat source in the turbine outlet pressure and net electricity generation (NEG), then the two systems are depicted and compared in a temperature-entropy diagram. The results indicate that the proposed system using R123 corresponds with the best performance when the refrigeration temperature is 2 °C. The NEG reaches 53.13 kW, and the maximum exergy efficiency is 37.21%. The NEG of the proposed system is improved by 28.3% compared with the conventional ORC system.
Significant finds
This paper provides a new coupling way to improve the power generation by cascade utilizing low-grade waste heat
Organic Rankine cycle (ORC) has been extensively applied to electricity generation by utilizing low grade residual heat.
Methods
A cascaded lithium bromide refrigeration cycle/ ORC to recover waste heat is proposed and investigated in this paper. Several critical parameters in terms of refrigeration temperature, the types of organic working medium, ORC high pressure, turbine discharge pressure, and segment temperature are studied to design and optimize the proposed system. Furthermore, the proposed system is compared with the conventional ORC that utilizes the same heat source in the turbine outlet pressure and net electricity generation (NEG), then the two systems are depicted and compared in a temperature-entropy diagram. The results indicate that the proposed system using R123 corresponds with the best performance when the refrigeration temperature is 2 °C. The NEG reaches 53.13 kW, and the maximum exergy efficiency is 37.21%. The NEG of the proposed system is improved by 28.3% compared with the conventional ORC system.
Significant finds
This paper provides a new coupling way to improve the power generation by cascade utilizing low-grade waste heat
| Original language | English |
|---|---|
| Article number | 104276 |
| Number of pages | 13 |
| Journal | Journal of the Taiwan Institute of Chemical Engineers |
| Volume | 133 |
| DOIs | |
| Publication status | Published - Apr 2022 |
Keywords
- Cascade utilization
- LiBr/H O absorption refrigeration
- Low-grade waste heat
- Organic Rankine cycle
ASJC Scopus subject areas
- Chemistry(all)
- Chemical Engineering(all)