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Multi-objective optimization of a novel reversible High-Temperature Heat Pump-Organic Rankine Cycle (HTHP-ORC) for industrial low-grade waste heat recovery
- Source :
- Repositori Universitat Jaume I, Universitat Jaume I
- Publication Year :
- 2019
- Publisher :
- Elsevier BV, 2019.
-
Abstract
- Nowadays, a high amount of industrial thermal energy is still lost due to the lack of competitive solutions for energy revalorization. Facing this challenge, this paper presents a novel technology, based on a reversible High-Temperature Heat Pump (HTHP) and Organic Rankine Cycle (ORC). The proposed system recovers low-grade waste heat to generate electricity or useful heat in accordance with consumer demand. Compressor and expander semi-empirical models have been considered for the reversible system computational simulation, being HFC-245fa the working fluid selected. The built-in volume ratio and Internal Heat Exchanger (IHX) effectiveness have been optimized to reach the maximum energy efficiency in each operating condition. Although HFC-245fa exhibits energy performance attributes, its high Global Warming Potential (GWP) is an issue for climate change mitigation. Hence, multi-objective optimisation of the environmentally friendly working fluids Butane, Pentane, HFO-1336mzz(Z), R-514A, HCFO-1233zd(E) and HCFO-1224yd(Z) has been carried out. The results show that the system proposed, working with HFC-245fa, achieves a Coefficient of Performance (COP) of 2.44 for condensing temperature of 140 °C, operating in HTHP mode, whereas the ORC mode provides a net electrical efficiency of 8.7% at condensing temperature of 40 °C. Besides, HCFO-1233zd(E) and HCFO-1224yd(Z) are both appropriate alternatives for the HFC-245fa replacement. These working fluids provide a COP improvement of 9.7% and 5.8% and electrical net efficiency improvement of 2.1% and 0.8%, respectively, compared to HFC-245fa. This paper provides a reference study for further designs and developments of reversible HTHP-ORC systems used for industrial low-grade waste heat recovery.
- Subjects :
- Reversible system
020209 energy
Energy Engineering and Power Technology
02 engineering and technology
Low GWP refrigerants
law.invention
Waste heat recovery unit
020401 chemical engineering
law
Waste heat
0202 electrical engineering, electronic engineering, information engineering
Decarbonisation
0204 chemical engineering
Process engineering
Organic Rankine Cycle (ORC)
Organic Rankine cycle
Renewable Energy, Sustainability and the Environment
business.industry
Coefficient of performance
High Temperature Heat Pump (HTHP)
Energy efficiency
Fuel Technology
Nuclear Energy and Engineering
Working fluid
Environmental science
business
Gas compressor
Thermal energy
Heat pump
Subjects
Details
- ISSN :
- 01968904
- Volume :
- 197
- Database :
- OpenAIRE
- Journal :
- Energy Conversion and Management
- Accession number :
- edsair.doi.dedup.....c853741aba8e9d68b31641493544c9ca