The Experts below are selected from a list of 306 Experts worldwide ranked by ideXlab platform
Saffa Riffat - One of the best experts on this subject based on the ideXlab platform.
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Review of Heat Recovery Technologies for Building Applications
Energies, 2019Co-Authors: Saffa Riffat, Shihao ZhangAbstract:In recent years, interest in Heat Recovery systems for building applications has resurged due to concerns about the energy crisis and global climate changes. This review presents current developments in four kinds of Heat Recovery systems for residential building applications. A extensive investigation into the Heat Recovery integrated in energy-saving systems of residential buildings is also covered, including passive systems for building components, mechanical/natural ventilation systems, dehumidification systems, and the thermoelectric module (TE) system. Based on this review, key issues have been identified as follows: (1) The combination of Heat Recovery and energy-efficient systems could be considered as a promising approach to reduce greenhouse gas emissions and make residential buildings meet high performance and comfort requirements. However, real-life evaluation of these systems with economic analysis is insufficient; (2) When Heat Recovery is applied to mechanical ventilation systems, issues such as pressure leakages and air shortcuts should be addressed; (3) The Heat pipe Heat Recovery system enjoys more potential in being combined with other sustainable technologies such as thermoelectric modules and solar energy systems due to its advantages, which include handy manufacturing and convenient maintenance, a lack of cross contamination, and greater thermal conductance.
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A comprehensive review of Heat Recovery systems for building applications
Renewable and Sustainable Energy Reviews, 2015Co-Authors: Pinar Mert Cuce, Saffa RiffatAbstract:Abstract In this paper, a comprehensive review on building applications of Heat Recovery systems is presented. The review is given as a clear and understandable summary of the previous works. The review covers detailed description of Heat Recovery systems with working principle and system components, current typical Heat Recovery technologies including the building applications, theoretical, experimental and simulation works carried out for different Heat Recovery technologies and findings from thermodynamic performance assessment. Moreover, environmental impacts of Heat Recovery systems are evaluated. Future scenarios for Heat Recovery technologies including some recommendations are also considered in the study. It is concluded from the results that the Heat Recovery systems are very promising to mitigate the fuel consumption amounts of buildings. Therefore, they can remarkably contribute in reducing greenhouse gas emissions in the atmosphere.
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A study of Heat-pipe Heat Recovery for natural ventilation
Building Services Engineering Research and Technology, 1999Co-Authors: Saffa RiffatAbstract:The performance of four types of Heat-pipe Heat Recovery unit for naturally ventilated buildings was determined in terms of effectiveness and pressure drop. The effectiveness of the Heat Recovery units was tested in a two-zone chamber. The pressure loss characteristics of the Heat Recovery units were determined using computational fluid dynamics (CFD) and experimental measurement. CFD was also used to evaluate the performance of a solar chimney for Heat Recovery in naturally ventilated buildings.
Ben Richard Hughes - One of the best experts on this subject based on the ideXlab platform.
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a review of Heat Recovery technology for passive ventilation applications
Renewable & Sustainable Energy Reviews, 2016Co-Authors: Dominic Oconnor, John Kaiser Calautit, Ben Richard HughesAbstract:A review of current Heat Recovery devices was undertaken in an attempt to determine the major factors preventing the integration of Heat Recovery technology into passive ventilation systems. The increase in space Heating and cooling demand in recent years combined with statutory requirements to reduce greenhouse gas emissions in the UK requires technology to be as efficient as possible, consuming the lowest amount of energy necessary. Heat Recovery technology can meet this demand by lowering the energy demand necessary for Heating and cooling by pre-Heating or pre-cooling. Six different Heat Recovery devices were analysed and compared for suitability for integration into passive ventilation systems. Heat pipes and rotary thermal wheels are suggested as the technologies with the most potential for integration due to high thermal efficiency and low pressure loss across the Heat Recovery device in comparison to the other technologies. High efficiency is necessary to recover the maximum amount of thermal energy available. Low pressure loss across the Heat exchanger is required to maintain adequate ventilation rates. The integration of Heat Recovery technology into passive ventilation has the potential to reduce energy demand in buildings but further research is required to optimise the Recovery devices for simple installation, high efficiency and low pressure loss.
Ruzhu Wang - One of the best experts on this subject based on the ideXlab platform.
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Perspectives for low-temperature waste Heat Recovery
Energy, 2019Co-Authors: Z Y Xu, Ruzhu Wang, Chun YangAbstract:Abstract In this forward-looking perspective, the current technologies for low-temperature waste Heat Recovery are first analyzed from two aspects: (i) the local waste Heat Recovery technology and (ii) global optimization of energy flow network. Based on the analysis, barriers for the further promotion of waste Heat Recovery are outlined, and they include the lack of global optimization methodology, distributed waste Heat Recovery system with high costs, and mismatches between waste Heat source and demand. To address these issues, perspectives on three aspects are provided. First, advanced graphical analysis and optimization methodology integrating the Heat exchange and energy conversion can promote the user-friendly optimization. Second, concentrated waste Heat Recovery and supply can save the investment, installation area and operation costs, thereby making the waste Heat Recovery cost-effective. Third, thermal storage, thermal transportation and high temperature Heat pump can better couple the waste Heat source and user demand from time-scale, spatial scale and energy grade, respectively. Visions for the future are combined with technical details to provide comprehensive perspectives for the next-step waste Heat Recovery.
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Dynamic analysis of Heat Recovery process for a continuous Heat Recovery adsorption Heat pump
Energy Conversion and Management, 2002Co-Authors: Jingyi Wu, Ruzhu Wang, Y.x. XuAbstract:The Heat Recovery cycle plays an important role in improving the operational performance of a continuous Heat Recovery adsorption Heat pump. The real Heat Recovery ratio would be less than the ideal Heat Recovery ratio because of the limited Heat transfer coefficient of the adsorber. In this paper, by dynamic calculation for a continuous Heat Recovery adsorption Heat pump, the Heat Recovery ratio in different working conditions was determined. Meanwhile, the influence of adsorber Heat transfer coefficient was analyzed, and the influences of system operation parameters, such as Heat source temperature, cooling water temperature, cycle time and so on, on the Heat Recovery process were also analyzed. The way to increase the usable Heat Recovery effect was discussed.
Dominic Oconnor - One of the best experts on this subject based on the ideXlab platform.
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a review of Heat Recovery technology for passive ventilation applications
Renewable & Sustainable Energy Reviews, 2016Co-Authors: Dominic Oconnor, John Kaiser Calautit, Ben Richard HughesAbstract:A review of current Heat Recovery devices was undertaken in an attempt to determine the major factors preventing the integration of Heat Recovery technology into passive ventilation systems. The increase in space Heating and cooling demand in recent years combined with statutory requirements to reduce greenhouse gas emissions in the UK requires technology to be as efficient as possible, consuming the lowest amount of energy necessary. Heat Recovery technology can meet this demand by lowering the energy demand necessary for Heating and cooling by pre-Heating or pre-cooling. Six different Heat Recovery devices were analysed and compared for suitability for integration into passive ventilation systems. Heat pipes and rotary thermal wheels are suggested as the technologies with the most potential for integration due to high thermal efficiency and low pressure loss across the Heat Recovery device in comparison to the other technologies. High efficiency is necessary to recover the maximum amount of thermal energy available. Low pressure loss across the Heat exchanger is required to maintain adequate ventilation rates. The integration of Heat Recovery technology into passive ventilation has the potential to reduce energy demand in buildings but further research is required to optimise the Recovery devices for simple installation, high efficiency and low pressure loss.
Ewa Zender–Świercz - One of the best experts on this subject based on the ideXlab platform.
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A Review of Heat Recovery in Ventilation
Energies, 2021Co-Authors: Ewa Zender–ŚwierczAbstract:The purpose of the article was to present information on Heat Recovery in ventilation systems and to highlight what has not been sufficiently researched in this regard. A lot of information can be found on methods and exchangers for Heat Recovery in centralized systems. Decentralized, façade systems for cyclical supply and exhaust air have not been sufficiently researched. It is known that these devices are sensitive to the influence of wind and temperature, hence Heat Recovery may be ineffective in their case. The literature describes the aspect of Heat Recovery depending on the location in climatic zones, depending on the number of degree days (HDD). Attention was also paid to the risk of freezing of Heat Recovery exchangers. The literature review also showed the lack of a universal method for assessing Heat Recovery exchangers and the method of their selection depending on the climate.
