The Experts below are selected from a list of 30678 Experts worldwide ranked by ideXlab platform
Vasile Minea - One of the best experts on this subject based on the ideXlab platform.
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drying Heat Pumps part ii agro food biological and wood products
2013Co-Authors: Vasile MineaAbstract:Abstract Part II of this critical, constructive review investigates the accuracy of laboratory and industrial-scale experimental methods and the results of published R&D studies on drying Heat Pumps. It tries to evaluate the application potential of proposed drying methods for various agro-food and wood products. The scope is to promote technological advancement and to accelerate the industrial implementation of drying Heat Pumps.
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drying Heat Pumps part i system integration
2013Co-Authors: Vasile MineaAbstract:Abstract Part I of this critical, non complacent review focuses on the dryer–Heat pump integration issue as presented in published R&D studies. It investigates the accuracy of current configurations and proposed improvements, and evaluates their applicability in the drying industry. The scope is to promote technological advancement and the industrial implementation of drying Heat Pumps.
R Z Wang - One of the best experts on this subject based on the ideXlab platform.
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vapor compression Heat Pumps with pure low gwp refrigerants
2021Co-Authors: R Z WangAbstract:Abstract Global warming is a major environmental concern, which significantly impacts ecological systems and the safety of coastal cities. To address global warming, effective methods must be adopted to reduce greenhouse gas emissions and the consumption of fossil fuels. Vapor compression Heat Pumps offer an effective way to recover energy from waste Heat sources and reduce primary energy consumption. However, the traditional working fluids used in Heat Pumps generally have a high global warming potential (GWP) and produce a significant greenhouse effect when leaked. Therefore, low-GWP (GWP
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waste Heat recovery of power plant with large scale serial absorption Heat Pumps
2018Co-Authors: H C Mao, D S Liu, R Z WangAbstract:Abstract Large amount of waste Heat is dissipated in industries, resulting in energy waste and environment pollution. Waste Heat recovery with absorption Heat pump is one of the attractive solutions. In this paper, we present the theoretical study and test of a power plant waste Heat recovery system with large scale LiBr-water absorption Heat Pumps for district Heating. Waste Heat from steam condenser with temperature of ∼35 °C is recovered by the absorption Heat Pumps driven by steam with pressure of ∼0.25 MPa from the turbine. Heat output from the absorption Heat Pumps is used to preHeat the return water of district Heating network from ∼45 °C to ∼80 °C. The return water is further Heated by the steam to ∼105 °C for Heating supply. Large temperature lift of the return water is achieved by the serial absorption Heat Pumps. Theoretical analysis of the system is presented, showing advantages compared to the conventional absorption Heat pump and original Heating supply system. On-site test showed that COP of 1.77 and Heating capacity of 63.57 MW were achieved by one serial absorption Heat pump, with waste Heat inlet/outlet temperature of 34.63/28.33 °C and return water inlet/outlet temperature of 45.94/81.34 °C.
Neil Hewitt - One of the best experts on this subject based on the ideXlab platform.
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Heat Pumps and energy storage the challenges of implementation
2012Co-Authors: Neil HewittAbstract:Abstract The wider implementation of variable renewable energy sources such as wind across the UK and Ireland will demand interconnection, energy storage and more dynamic energy systems to maintain a stable energy system that makes full use of one of our best renewable energy resources. However large scale energy storage e.g. pumped storage may be economically challenging. Therefore can thermal energy storage deployed domestically fulfil an element of such an energy storage role? Current electricity pricing is based on a ½ hourly timeframe which will be demonstrated to have some benefits for hot water Heating from electrical water Heaters in the first instance. However Heat Pumps linked to energy storage can displace fossil fuel Heating systems and therefore the question is whether a renewable tariff based on “excess” wind for example is sufficient to operate Heat Pumps. An initial analysis of this scenario will be presented and its potential role in challenging aspects of fuel poverty.
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advanced air source Heat Pumps for uk and european domestic buildings
2011Co-Authors: Neil Hewitt, M Huang, Mark Anderson, Matthew QuinnAbstract:Abstract To date, the role of Heat Pumps in UK and European housing has been largely restricted to newbuild, utilising ground source units coupled to under floor Heating systems. Therefore the challenge is to develop air source Heat Pumps whose role is to displace the traditional domestic fossil fuel boiler with the minimum of domestic disturbance by utilising a system capable of Heating radiators to sufficient temperatures to maintain comfort and safety. The technical challenges to be overcome at this stage are maintaining high coefficient of performance in spite of the high temperature lift encountered when utilising cold air as a Heat source and delivering to a Heating circuit originally designed for water at temperatures of 60 °C or more. Options to deliver this include an economised vapour injection compressor and displacing the traditional expansion valve with an expansion turbine and experimental results from both of these approaches will be presented here.
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an economic and technical case for a compressor expander unit for Heat Pumps
2000Co-Authors: P C Henderson, Neil Hewitt, B MongeyAbstract:Despite their obvious environmental benefit, Heat Pumps in general have difficulties in penetrating the Heating market because of the high initial capital cost. However, given the fact that in the U.K. space Heating alone accounts for nearly 50 per cent of all the primary energy used, the universal adoption of Heat pump subsidies similar to those offered by certain German utilities for example would be an effective contributor to the reduction of greenhouse gas emission. However, it would be improper for subsidies alone to be the only mechanism by which Heat Pumps could gain the scale of market acceptance necessary in order to make the required greenhouse gas emission cuts. Therefore, a new generation of Heat Pumps must have a superior performance than existing units operating with HCFC R22 or R407c. The use of R410a can aid Heat pump market penetration by having Heat Pumps of a superior performance and a smaller size. However, to make full use of R410a, the difficulties of the relatively low critical point must be overcome and the use of a novel compressor/expander unit is illustrated. Copyright © 2000 John Wiley & Sons, Ltd.
Karsten Hedegaard - One of the best experts on this subject based on the ideXlab platform.
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energy system investment model incorporating Heat Pumps with thermal storage in buildings and buffer tanks
2013Co-Authors: Karsten Hedegaard, Olexandr BalykAbstract:Individual compression Heat Pumps constitute a potentially valuable resource in supporting wind power integration due to their economic competitiveness and possibilities for flexible operation. When analysing the system benefits of flexible Heat pump operation, effects on investments should be taken into account. In this study, we present a model that facilitates analysing individual Heat Pumps and complementing Heat storages in integration with the energy system, while optimising both investments and operation. The model incorporates thermal building dynamics and covers various Heat storage options: passive Heat storage in the building structure via radiator Heating, active Heat storage in concrete floors via floor Heating, and use of thermal storage tanks for space Heating and hot water. It is shown that the model is well qualified for analysing possibilities and system benefits of operating Heat Pumps flexibly. This includes prioritising Heat pump operation for hours with low marginal electricity production costs, and peak load shaving resulting in a reduced need for peak and reserve capacity investments.
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influence of individual Heat Pumps on wind power integration energy system investments and operation
2013Co-Authors: Karsten Hedegaard, Marie MunsterAbstract:Abstract Individual Heat Pumps are expected to constitute a significant electricity demand in future energy systems. This demand becomes flexible if investing in complementing Heat storage capabilities. In this study, we analyse how the Heat Pumps can influence the integration of wind power by applying an energy system model that optimises both investments and operation, and covers various Heat storage options. The Danish energy system by 2030 with around 50–60% wind power is used as a case study. Results show that the Heat Pumps, even without flexible operation, can contribute significantly to facilitating larger wind power investments and reducing system costs, fuel consumption, and CO 2 emissions. Investments in Heat storages can provide only moderate system benefits in these respects. The main benefit of the flexible Heat pump operation is a reduced need for peak/reserve capacity, which is also crucial for the feasibility of the Heat storages. Socio-economic feasibility is identified for control equipment enabling intelligent Heat storage in the building structure and in existing hot water tanks. In contrast, investments in new Heat accumulation tanks are not found competitive.
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wind power integration using individual Heat Pumps analysis of different Heat storage options
2012Co-Authors: Karsten Hedegaard, Brian Vad Mathiesen, Henrik Lund, Per HeiselbergAbstract:Significant installations of individual Heat Pumps are expected in future energy systems due to their economic competitiveness. This case study of the Danish energy system in 2020 with 50% wind power shows that individual Heat Pumps and Heat storages can contribute to the integration of wind power. Heat accumulation tanks and passive Heat storage in the construction are investigated as two alternative storage options in terms of their ability to increase wind power utilisation and to provide cost-effective fuel savings. Results show that passive Heat storage can enable equivalent to larger reductions in excess electricity production and fuel consumption than Heat accumulation tanks. Moreover, passive Heat storage is found to be significantly more cost-effective than Heat accumulation tanks. In terms of reducing fuel consumption of the energy system, the installation of Heat Pumps is the most important step. Adding Heat storages only moderately reduces the fuel consumption. Model development has been made to facilitate a technical optimisation of individual Heat Pumps and Heat storages in integration with the energy system.
Henrik Lund - One of the best experts on this subject based on the ideXlab platform.
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Heat roadmap europe large scale electric Heat Pumps in district Heating systems
2017Co-Authors: Andrei David, Brian Vad Mathiesen, Sven Werner, Helge Averfalk, Henrik LundAbstract:The Heat Roadmap Europe (HRE) studies estimated a potential increase of the district Heating (DH) share to 50% of the entire Heat demand by 2050, with approximately 25–30% of it being supplied using large-scale electric Heat Pumps. This study builds on this potential and aims to document that such developments can begin now with technologies currently available. We present a database and the status of the technology and its ability of expansion to other European locations by reviewing experiences aimed at further research or application in the Heating industry. This is based on a survey of the existing capacity of electric large-scale Heat Pumps with more than 1 MW thermal output, operating in European DH systems. The survey is the first database of its kind containing the technical characteristics of these Heat Pumps, and provides the basis for the analysis of this paper. By quantifying the Heat sources, refrigerants, efficiency and types of operation of 149 units with 1580 MW of thermal output, the study further uses this data to analyze if the deployment of this technology on a large-scale is possible in other locations in Europe. It finally demonstrates that the technical level of the existing Heat Pumps is mature enough to make them suitable for replication in other locations in Europe.
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wind power integration using individual Heat Pumps analysis of different Heat storage options
2012Co-Authors: Karsten Hedegaard, Brian Vad Mathiesen, Henrik Lund, Per HeiselbergAbstract:Significant installations of individual Heat Pumps are expected in future energy systems due to their economic competitiveness. This case study of the Danish energy system in 2020 with 50% wind power shows that individual Heat Pumps and Heat storages can contribute to the integration of wind power. Heat accumulation tanks and passive Heat storage in the construction are investigated as two alternative storage options in terms of their ability to increase wind power utilisation and to provide cost-effective fuel savings. Results show that passive Heat storage can enable equivalent to larger reductions in excess electricity production and fuel consumption than Heat accumulation tanks. Moreover, passive Heat storage is found to be significantly more cost-effective than Heat accumulation tanks. In terms of reducing fuel consumption of the energy system, the installation of Heat Pumps is the most important step. Adding Heat storages only moderately reduces the fuel consumption. Model development has been made to facilitate a technical optimisation of individual Heat Pumps and Heat storages in integration with the energy system.
