Investigation on advanced heat pump systems with improved energy efficiency

Hu, Bin; Xu, S.Z.; Wang, R.Z.; Liu, Hua; Han, Luyao; Zhang, Zhiping; Li, Hongbo

doi:10.1016/j.enconman.2019.04.031

Cited by 27 publications

(10 citation statements)

References 14 publications

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“…The pump discharge channel has been divided into two streams and, after changing the direction from radial to axial, it is connected in the discharge stub pipe. [10] The authors of the article successfully tested and applied such a solution to the previously implemented mining pump. The three-phase alternating current electric motor with permanent magnets presented in the construction was designed and made by professor Zbigniew Goryca.…”

Section: Pump Designmentioning

confidence: 99%

On-line pump for very low power heating or cooling system

Goryca

Peczkis

Synowiec³

et al. 2021

MATEC Web Conf.

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The article presents the concept of a new circulation pump for low power heating or cooling system, dedicated to systems where it is necessary to ensure a slight liquid flow during periods of operation at a significantly low efficiency of the systems. The assumption for the construction of the new pump was the possibility of its installation in the pipeline axis. The proposed prototype design includes the application of a patented solution to relieve the axial force acting in a flow system [1,2]. Additionally, a new permanent magnet DC motor designed and manufactured for this pump was used. The design of the pump takes into account the requirement of maximum silence, which results from its intended use in close proximity to human habitation. The design of the pump has been tested numerically. The results of numerical tests are presented. The pump was made in the rapid prototyping technique in a 3D printer. The pump was built into a dedicated test stand with measuring instruments verified in terms of the quality of measurements. A series of measurements was made on the basis of which the flow characteristics of the pump were determined. During the research, risks for the operation of the new structure were identified, which will be taken care of in a further stage of the research, and the structure, after removing the defects, will be directed to production [3].

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Section: Pump Designmentioning

confidence: 99%

On-line pump for very low power heating or cooling system

Goryca

Peczkis

Synowiec³

et al. 2021

MATEC Web Conf.

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“…The electric centrifugal compression heat pump [20] and the two-stage one [21,22] could upgrade the exhausted heat to 50 • C and 70 • C, respectively. The two-cycle parallel system with centrifugal compressors has a larger coefficient of performance (COP) when the temperature lift is kept at 30 • C [23]. When the temperature lift is 58-72 • C, the COP of the cascade compression heat pump could be improved to 3.1 by using R600 and R290 [24].…”

Section: Introductionmentioning

confidence: 99%

New Low-Temperature Central Heating System Integrated with Industrial Exhausted Heat Using Distributed Electric Compression Heat Pumps for Higher Energy Efficiency

et al. 2020

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Industrial exhausted heat can be used as the heat source of central heating for higher energy efficiency. To recover more industrial exhausted heat, a new low-temperature central heating system integrated with industrial exhausted heat using distributed electric compression heat pumps is put forward and analyzed from the aspect of thermodynamics and economics. The roles played by the distributed electric compression heat pumps in improving both thermal performance and financial benefit of the central heating system integrated with industrial exhausted heat are greater than those by the centralized electric compression heat pumps. The proposed low-temperature central heating system has higher energy efficiency, better financial benefit, and longer economical distance of transmitting exhausted heat, and thus, its configuration is optimal. For the proposed low-temperature central heating system, the annual coefficient of performance, annual product exergy efficiency, heating cost, and payback period are about 22.2, 59.4%, 42.83 ¥/GJ, and 6.2 years, respectively, when the distance of transmitting exhausted heat and the price of exhausted heat are 15 km and 15 ¥/GJ, respectively. The economical distance of transmitting exhausted heat of the proposed low-temperature central heating system could approach 25.1 km.

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“…These systems are named as high-temperature heat pumps (HTHPs) due to their capacity to achieve heating temperatures between 100 and 160 °C [5]. These compression heat pumps provide hightemperature and larger-capacity, becoming one of the practical solutions to meet the requirement of industrial waste heat recovery [23]. Urbanucci et al [24] conducted an HTHPs integration in trigeneration, showing that this integration provides flexibility to cover variable energy demands along with valuable economic and energy performance improvements.…”

Section: Introductionmentioning

confidence: 99%

Multi-objective optimization of a novel reversible High-Temperature Heat Pump-Organic Rankine Cycle (HTHP-ORC) for industrial low-grade waste heat recovery

Mateu-Royo

Navarro-Esbrí

Peris

et al. 2019

Energy Conversion and Management

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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.

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Investigation on advanced heat pump systems with improved energy efficiency

Cited by 27 publications

References 14 publications

On-line pump for very low power heating or cooling system

On-line pump for very low power heating or cooling system

New Low-Temperature Central Heating System Integrated with Industrial Exhausted Heat Using Distributed Electric Compression Heat Pumps for Higher Energy Efficiency

Multi-objective optimization of a novel reversible High-Temperature Heat Pump-Organic Rankine Cycle (HTHP-ORC) for industrial low-grade waste heat recovery

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