Practical heat pump and storage integration into non-continuous processes: A hybrid approach utilizing insight based and nonlinear programming techniques

Stampfli, Jan A.; Atkins, Martin John; Olsen, Donald G.; Walmsley, Michael R.W.; Wellig, Beat

doi:10.1016/j.energy.2019.05.218

Cited by 22 publications

(9 citation statements)

References 25 publications

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“…Conventional methods identify integration points under the assumption of a constant Second law efficiency using the COP curve [11]. In contrast, the targeting method described in Section 3.1 is based on the COP regression models of market-available HPs presented in Section 2.…”

Section: Discussionmentioning

confidence: 99%

“…The novel targeting method using METD also meets the requirements of Fu and Gundersen [16] and Gai et al [19] for realistic modelling of the temperature change on the process sink side. The conventional approach according to Stampfli et al [11] used a storage-based HRL (cf. Figure 4b), which reduces the COP on the heat source and sink side due to the additional HEX temperature difference.…”

Section: Discussionmentioning

confidence: 99%

“…In their work, Stampfli et al [11] combined the advantages of insight-based and automated approaches. They used COP curves [12] and supply and demand curves [13] on the one hand to find an optimal solution with a fast processing time, and on the other hand to visualise intuitively the integration.…”

Section: Heat Pump Integration Methodsmentioning

confidence: 99%

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Heat Pump Bridge Analysis Using the Modified Energy Transfer Diagram

et al. 2020

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Heat pumps are the key technology to decarbonise thermal processes by upgrading industrial surplus heat using renewable electricity. Existing insight-based integration methods refer to the idealised Grand Composite Curve requiring the full exploitation of heat recovery potential but leave the question of how to deal with technical or economic limitations unanswered. In this work, a novel Heat Pump Bridge Analysis (HPBA) is introduced for practically targeting technical and economic heat pump potential by applying Coefficient of Performance curves into the Modified Energy Transfer Diagram (METD). Removing cross-Pinch violations and operating heat exchangers at minimum approach temperatures by combined application of Bridge Analysis increases the heat recovery rate and reduce the temperature lift to be pumped at the same time. The insight-based METD allows the individual matching of heat surpluses and deficits of individual streams with the capabilities and performance of different market-available heat pump concepts. For an illustrative example, the presented modifications based on HPBA increase the economically viable share of the technical heat pump potential from 61% to 79%.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

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Heat Pump Bridge Analysis Using the Modified Energy Transfer Diagram

et al. 2020

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“…Stampfli et al [9] adapted Pinch Analysis to integrating VCHP for HPs in batch processes. A hybrid method [10] that unifies the insight-based and mathematical programming approaches has been proposed for industrial HP integration in batch processes to avoid long computation times. Another criterion EPC (i.e., the coefficient of performance in exergy per total annual cost) was proposed [11] for selecting HPs, modelling diverse types of HPs for operating conditions.…”

Section: State Of the Art Reviewmentioning

confidence: 99%

Critical Analysis of Process Integration Options for Joule-Cycle and Conventional Heat Pumps

et al. 2020

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To date, research on heat pumps (HP) has mainly focused on vapour compression heat pumps (VCHP), transcritical heat pumps (TCHP), absorption heat pumps, and their heat integration with processes. Few studies have considered the Joule cycle heat pump (JCHP), which raises several questions. What are the characteristics and specifics of these different heat pumps? How are they different when they integrate with the processes? For different processes, which heat pump is more appropriate? To address these questions, the performance and integration of different types of heat pumps with various processes have been studied through Pinch Methodology. The results show that different heat pumps have their own optimal application range. The new JCHP is suitable for processes in which the temperature changes of source and sink are both massive. The VCHP is more suitable for the source and sink temperatures, which are near-constant. The TCHP is more suitable for sources with small temperature changes and sinks with large temperature changes. This study develops an approach that provides guidance for the selection of heat pumps by applying Process Integration to various combinations of heat pump types and processes. It is shown that the correct choice of heat pump type for each application is of utmost importance, as the Coefficient of Performance can be improved by up to an order of magnitude. By recovering and upgrading process waste heat, heat pumps can save 15–78% of the hot utility depending on the specific process.

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“…With a focus on optimising individual processes as well as the overall system, several scientific and engineering methods are employed and continuously improved [20]. These include the use of energy, exergy and pinch analyses, as well as the development and implementation of advanced mathematical approaches for the optimal design and integration of industrial heat pumps for a variety of industrial processes [21,22]. For many of the investigations carried out and methods used, primarily case studies of existing plants were employed to identify the potential for optimisation in the scope of improved process control and/or waste heat recovery.…”

Section: Introductionmentioning

confidence: 99%

Integrated high temperature heat pumps and thermal storage tanks for combined heating and cooling in the industry

Ahrens

Foslie

Moen

et al. 2021

Applied Thermal Engineering

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This study investigates the integrated heat pump system of a green-field dairy located in Bergen, Norway. The purpose of the study is to determine the energy consumption and system performance. The dairy features a novel and innovative solution of a fully integrated energy system, employing high temperature heat pumps such as the hybrid absorption-compression heat pump (HACHP) with natural refrigerants to provide all temperature levels of heating and cooling demands. To evaluate the performance an energy analysis has been performed based on available process data for a comparatively energy-intensive week in February. The results have shown that the integrated system is able to meet the occurring demands. Furthermore, the specific energy consumption with 0.22 kWh l − 1 product can outperform the annual average value of the replaced dairy even under difficult conditions. However, it is expected that the specific energy consumption will be further reduced on an annual basis. Through measures such as the extensive use of waste heat recovery accounting for 32.7% of the energy used, energy consumption was reduced by 37.9% and greenhouse gas (GHG) emissions by up to 91.7% compared to conventional dairy systems. Simultaneous, the process achieves a waste heat recovery rate of over 95%. Furthermore, demand peaks were compensated and a system coefficient of performance (COP) of 4.1 was achieved along with the identification of existing potential for further improvements.

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Practical heat pump and storage integration into non-continuous processes: A hybrid approach utilizing insight based and nonlinear programming techniques

Cited by 22 publications

References 25 publications

Heat Pump Bridge Analysis Using the Modified Energy Transfer Diagram

Heat Pump Bridge Analysis Using the Modified Energy Transfer Diagram

Critical Analysis of Process Integration Options for Joule-Cycle and Conventional Heat Pumps

Integrated high temperature heat pumps and thermal storage tanks for combined heating and cooling in the industry

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