Recent Researches on Steam Generation Heat Pump System

Kang, Dae-Hoon; Na, Sun-Ik

doi:10.1142/s2010132517300051

Cited by 15 publications

(3 citation statements)

References 27 publications

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“…No economic parameter was taken into consideration, performing an analysis purely based on thermodynamics. Despite comparing different heat supply technologies under energy and exergy point of view, filling a reported gap in the literature [33], these results could be of less interest from an industrial perspective, concerning the working domains in which a boiler substitution would be beneficial from an investor viewpoint. However, the aim of the work was to state a basis for taking research and development decisions based on sustainability, with a long-term perspective.…”

Section: Discussionmentioning

confidence: 97%

Thermodynamic competitiveness of high temperature vapor compression heat pumps for boiler substitution

Bergamini

Jensen

Elmegaard

2019

Energy

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Replacement of fossil fuel-fired boilers for generation of high-temperature water and steam is of paramount importance for reaching a fossil-free economy. Heat pumps could be possible substitutes, but the presently marketed solutions are mainly limited to low-temperature applications. This paper compares the thermodynamic performance of various High-Temperature Heat Pumps (HTHP) based on the vapor compression cycle with natural gas boilers for assessing their technical feasibility and competitiveness as future replacements. Different cycle configurations and natural refrigerants were compared based on the coefficient of system performance and exergetic efficiency. Moreover, the technical feasibility of the most interesting cycles was discussed based on current technologies. The results showed that HTHP are promising substitutes for gas boilers for heat production of temperatures up to 180°C. In particular, ammonia cycles were preferable for source and sink temperatures lower than 60°C and 110°C, respectively, while water was a better-working fluid at higher temperatures. The complete exergy analysis showed different behaviors for various natural refrigerants in the working domain but confirmed the results identified by the energy analysis. In any case, the technological analysis showed that further improvement of compressor technologies is required for making these solutions competitive.

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Section: Discussionmentioning

confidence: 97%

Thermodynamic competitiveness of high temperature vapor compression heat pumps for boiler substitution

Bergamini

Jensen

Elmegaard

2019

Energy

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“…Next to direct steam generation, SGHPs often produce steam through a flashing process [63][64][65], as shown in Figure 7. In this process the VCHP adds heat to pressurized water, which is flashed afterwards to a liquid-vapor mixture in a flash tank (i.e., phase separator).…”

Section: Steam Flashingmentioning

confidence: 99%

The Potential of Vapor Compression Heat Pumps Supplying Process Heat between 100 and 200 °C in the Chemical Industry

Vieren,

Demeester,

Beyne

et al. 2023

Energies

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The supply of process heat in the chemical industry is dominated by fossil fuel combustion. Heat with temperatures up to 200 °C could, however, be supplied by vapor compression heat pumps (VCHPs), allowing for efficient electrification. However, there are still several barriers that need to be overcome before they can be widely implemented. In this work VCHPs are thermodynamically compared to heat-driven heat pumps and heat transformers, exploiting the potential of VCHPs. Moreover, steam production, distillation and drying are found to be of primary interest within the chemical industry, and potential integration points are presented and discussed for these applications. Finally, a financial analysis is performed based on a steam production and a superheated steam drying case study. The analysis calculates the levelized cost of heat (LCOH) of a VCHP, heat transformer, natural gas boiler and electric boiler. Furthermore, a sensitivity analysis of the LCOH to the annual operating hours, carbon pricing and waste heat availability is presented. Generally, when no emissions trading scheme (ETS) is applied, both the VCHP and a combination of a heat transformer with auxiliary natural gas boiler appeared as the most optimal solutions, depending on the energy prices. Due to the limited utilization of waste heat by the heat transformer, an auxiliary natural gas or electric boiler is essential to fully meet the required heating load. When an ETS is being applied the VCHP generally appeared to be most financially attractive technology for both the case studies.

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“…To test this theoretical hypothesis, the team (Bamigbetan et al, 2019) designed a butane compressor and built an experimental platform with a HTHP system. D. H et al (KANG et al, 2017) first analyzed the difference between SGH120 and SGH165. Summarized the influence of the flash tank and MVR device on the steam system of HTHP.…”

Section: Introductionmentioning

confidence: 99%

System optimization of steam generation in the dual-flash compound circulation system

et al. 2023

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Concentrating on the problem of massive energy loss in the compressor, expansion valve, and the other components present in the high-temperature heat pump system under extensive temperature lift, the dual-flash compound circulation system is proposed and the thermodynamic model of the dual-flash compound circulation system was established. The article combines the multivariate simulated annealing algorithm, utilizes the system COP as the optimization goal, and completes the calculation of the thermodynamic parameters in the steady-state of the system that is based on satisfying the conditions of the system process. Using R245fa as the refrigerant, the condensation temperature is set within the range of 110°C–140°C for the model calculation. The results show that, compared to the traditional two-stage compression system under the same environment, the COP of the dual-flash compound circulation system can be increased up to 5.71%–12.13%, and the exergy efficiency can be increased by 5.11%–10.71%, respectively. Besides, steam production per unit refrigerant is also increased by 3.79%–5.14%. Finally, the feasibility of the theoretical model is verified by simulation, and it is concluded that the dual-flash compound circulation system has better steam production performance at the extensive temperature lift and the elevated condensation temperature.

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Recent Researches on Steam Generation Heat Pump System

Cited by 15 publications

References 27 publications

Thermodynamic competitiveness of high temperature vapor compression heat pumps for boiler substitution

Thermodynamic competitiveness of high temperature vapor compression heat pumps for boiler substitution

The Potential of Vapor Compression Heat Pumps Supplying Process Heat between 100 and 200 °C in the Chemical Industry

System optimization of steam generation in the dual-flash compound circulation system

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