The Experts below are selected from a list of 5298 Experts worldwide ranked by ideXlab platform
Shoaib Khanmohammadi - One of the best experts on this subject based on the ideXlab platform.
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feasibility of a hybrid bipv t and Thermal Wheel system for exhaust air heat recovery energy and exergy assessment and multi objective optimization
Applied Thermal Engineering, 2019Co-Authors: Amin Shahsavar, Shoaib KhanmohammadiAbstract:Abstract In this paper, a numerical study is conducted to examine the energy and exergy performance and multi-objective optimization of a novel exhaust air heat recovery system made up of a building integrated photovoltaic/Thermal (BIPV/T) collector and a Thermal Wheel (TW) system. The innovative BIPV/T-TW system is capable of pre-heating/pre-cooling the ambient fresh air in winter/summer and also producing electricity. Comparisons are carried out on the basis of energy and exergy by considering three different exhaust air heat recovery systems including the BIPV/T-TW system, the conventional BIPV/T collector, and the convectional TW system. It is observed that the BIPV/T-TW system has the best energy performance among the considered systems in all months of the year, while its exergy performance is lower than the BIPV/T system. Then, the multi-objective optimization technique is utilized to obtain the optimal values of geometric and operating parameters in order to maximize the annual useful energy and exergy obtained from the BIPV/T-TW system. It is found that annual useful energy and exergy gained by the optimized system is 196.31 MWh and 30.15 MWh, which is 563.8% and 1394.1% higher than the un-optimized system, respectively.
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Feasibility of a hybrid BIPV/T and Thermal Wheel system for exhaust air heat recovery: Energy and exergy assessment and multi-objective optimization
Applied Thermal Engineering, 2019Co-Authors: Amin Shahsavar, Shoaib KhanmohammadiAbstract:Abstract In this paper, a numerical study is conducted to examine the energy and exergy performance and multi-objective optimization of a novel exhaust air heat recovery system made up of a building integrated photovoltaic/Thermal (BIPV/T) collector and a Thermal Wheel (TW) system. The innovative BIPV/T-TW system is capable of pre-heating/pre-cooling the ambient fresh air in winter/summer and also producing electricity. Comparisons are carried out on the basis of energy and exergy by considering three different exhaust air heat recovery systems including the BIPV/T-TW system, the conventional BIPV/T collector, and the convectional TW system. It is observed that the BIPV/T-TW system has the best energy performance among the considered systems in all months of the year, while its exergy performance is lower than the BIPV/T system. Then, the multi-objective optimization technique is utilized to obtain the optimal values of geometric and operating parameters in order to maximize the annual useful energy and exergy obtained from the BIPV/T-TW system. It is found that annual useful energy and exergy gained by the optimized system is 196.31 MWh and 30.15 MWh, which is 563.8% and 1394.1% higher than the un-optimized system, respectively.
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Performance assessment of an innovative exhaust air energy recovery system based on the PV/T-assisted Thermal Wheel
Energy, 2018Co-Authors: Amin Shahsavar, Shoaib Khanmohammadi, Mahsa Khaki, Mazyar SalmanzadehAbstract:Abstract This research work aims to assess the performance of an innovative exhaust air energy recovery system consisting of a building integrated photovoltaic/Thermal (BIPV/T) and a Thermal Wheel (TW). This BIPV/T-TW system has two main operating modes, namely winter and summer. The exhaust air is used for pre-heating and pre-cooling the ambient fresh air through a TW in the winter and summer modes of operation, respectively. Besides, the pre-heated fresh air (in the winter mode) and the heated exhaust air (in the summer mode) is used for reducing the temperature of PV panels and consequently improving their electrical efficiency. The electrical and Thermal performance of the system is calculated and compared with those of the conventional BIPV/T and TW systems. Besides, a performance evaluation criterion (PEC) is defined in this study to investigate the overall performance of the studied systems. The results shows that the BIPV/T-TW system has higher PEC than the BIPV/T and TW systems. Furthermore, the effect of various important parameters on the yearly average PEC of the BIPV/T-TW system is analyzed. The economic assessment of BIPV/T-TW represents that the return time of investment according to simple payback (SP) and net present value (NPV) is a reasonable value.
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Energy analysis and multi-objective optimization of a novel exhaust air heat recovery system consisting of an air-based building integrated photovoltaic/Thermal system and a Thermal Wheel
Energy Conversion and Management, 2018Co-Authors: Shoaib Khanmohammadi, Amin ShahsavarAbstract:Abstract This paper presents a feasibility investigation of integrating an air-based photovoltaic/Thermal (PV/T) system with a Thermal Wheel (TW) system for residential applications. The innovative system is capable of pre-heating/pre-cooling the ambient fresh air in winter/summer as well as producing electricity. The performance of the system is numerically evaluated and compared with the conventional building integrated PV/T (BIPV/T) and TW systems. Then, a multi-objective optimization approach is utilized to find the optimum values of geometric and operating parameters in order to maximize the annual average effectiveness of the TW and the first-law efficiency of the BIPV/T collector. The performances of the optimized and un-optimized BIPV/T-TW systems are compared for a complete year. The results demonstrated that the BIPV/T-TW system has a better Thermal performance compared with the BIPV/T and TW systems, while it has a slightly lower electrical performance compared with the BIPV/T system. Furthermore, it was found that the annual average first-law efficiency and TW effectiveness of the optimized BIPV/T-TW system is 118.3% and 59.7% higher than that of the un-optimized system.
Amin Shahsavar - One of the best experts on this subject based on the ideXlab platform.
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feasibility of a hybrid bipv t and Thermal Wheel system for exhaust air heat recovery energy and exergy assessment and multi objective optimization
Applied Thermal Engineering, 2019Co-Authors: Amin Shahsavar, Shoaib KhanmohammadiAbstract:Abstract In this paper, a numerical study is conducted to examine the energy and exergy performance and multi-objective optimization of a novel exhaust air heat recovery system made up of a building integrated photovoltaic/Thermal (BIPV/T) collector and a Thermal Wheel (TW) system. The innovative BIPV/T-TW system is capable of pre-heating/pre-cooling the ambient fresh air in winter/summer and also producing electricity. Comparisons are carried out on the basis of energy and exergy by considering three different exhaust air heat recovery systems including the BIPV/T-TW system, the conventional BIPV/T collector, and the convectional TW system. It is observed that the BIPV/T-TW system has the best energy performance among the considered systems in all months of the year, while its exergy performance is lower than the BIPV/T system. Then, the multi-objective optimization technique is utilized to obtain the optimal values of geometric and operating parameters in order to maximize the annual useful energy and exergy obtained from the BIPV/T-TW system. It is found that annual useful energy and exergy gained by the optimized system is 196.31 MWh and 30.15 MWh, which is 563.8% and 1394.1% higher than the un-optimized system, respectively.
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Feasibility of a hybrid BIPV/T and Thermal Wheel system for exhaust air heat recovery: Energy and exergy assessment and multi-objective optimization
Applied Thermal Engineering, 2019Co-Authors: Amin Shahsavar, Shoaib KhanmohammadiAbstract:Abstract In this paper, a numerical study is conducted to examine the energy and exergy performance and multi-objective optimization of a novel exhaust air heat recovery system made up of a building integrated photovoltaic/Thermal (BIPV/T) collector and a Thermal Wheel (TW) system. The innovative BIPV/T-TW system is capable of pre-heating/pre-cooling the ambient fresh air in winter/summer and also producing electricity. Comparisons are carried out on the basis of energy and exergy by considering three different exhaust air heat recovery systems including the BIPV/T-TW system, the conventional BIPV/T collector, and the convectional TW system. It is observed that the BIPV/T-TW system has the best energy performance among the considered systems in all months of the year, while its exergy performance is lower than the BIPV/T system. Then, the multi-objective optimization technique is utilized to obtain the optimal values of geometric and operating parameters in order to maximize the annual useful energy and exergy obtained from the BIPV/T-TW system. It is found that annual useful energy and exergy gained by the optimized system is 196.31 MWh and 30.15 MWh, which is 563.8% and 1394.1% higher than the un-optimized system, respectively.
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Performance assessment of an innovative exhaust air energy recovery system based on the PV/T-assisted Thermal Wheel
Energy, 2018Co-Authors: Amin Shahsavar, Shoaib Khanmohammadi, Mahsa Khaki, Mazyar SalmanzadehAbstract:Abstract This research work aims to assess the performance of an innovative exhaust air energy recovery system consisting of a building integrated photovoltaic/Thermal (BIPV/T) and a Thermal Wheel (TW). This BIPV/T-TW system has two main operating modes, namely winter and summer. The exhaust air is used for pre-heating and pre-cooling the ambient fresh air through a TW in the winter and summer modes of operation, respectively. Besides, the pre-heated fresh air (in the winter mode) and the heated exhaust air (in the summer mode) is used for reducing the temperature of PV panels and consequently improving their electrical efficiency. The electrical and Thermal performance of the system is calculated and compared with those of the conventional BIPV/T and TW systems. Besides, a performance evaluation criterion (PEC) is defined in this study to investigate the overall performance of the studied systems. The results shows that the BIPV/T-TW system has higher PEC than the BIPV/T and TW systems. Furthermore, the effect of various important parameters on the yearly average PEC of the BIPV/T-TW system is analyzed. The economic assessment of BIPV/T-TW represents that the return time of investment according to simple payback (SP) and net present value (NPV) is a reasonable value.
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Energy analysis and multi-objective optimization of a novel exhaust air heat recovery system consisting of an air-based building integrated photovoltaic/Thermal system and a Thermal Wheel
Energy Conversion and Management, 2018Co-Authors: Shoaib Khanmohammadi, Amin ShahsavarAbstract:Abstract This paper presents a feasibility investigation of integrating an air-based photovoltaic/Thermal (PV/T) system with a Thermal Wheel (TW) system for residential applications. The innovative system is capable of pre-heating/pre-cooling the ambient fresh air in winter/summer as well as producing electricity. The performance of the system is numerically evaluated and compared with the conventional building integrated PV/T (BIPV/T) and TW systems. Then, a multi-objective optimization approach is utilized to find the optimum values of geometric and operating parameters in order to maximize the annual average effectiveness of the TW and the first-law efficiency of the BIPV/T collector. The performances of the optimized and un-optimized BIPV/T-TW systems are compared for a complete year. The results demonstrated that the BIPV/T-TW system has a better Thermal performance compared with the BIPV/T and TW systems, while it has a slightly lower electrical performance compared with the BIPV/T system. Furthermore, it was found that the annual average first-law efficiency and TW effectiveness of the optimized BIPV/T-TW system is 118.3% and 59.7% higher than that of the un-optimized system.
L S Chan - One of the best experts on this subject based on the ideXlab platform.
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Simulation–optimization of solar-assisted desiccant cooling system for subtropical Hong Kong
Applied Thermal Engineering, 2010Co-Authors: K.f. Fong, T T Chow, L S ChanAbstract:Abstract Solar cooling is a novel approach, which primarily makes use of solar energy, instead of electricity, to drive the air-conditioning systems. In this study, solar-assisted desiccant cooling system (SADCS) was designed to handle the cooling load of typical office in the subtropical Hong Kong, in which half of the building energy is consumed by the air-conditioning systems. The SADCS mainly consisted of desiccant Wheel, Thermal Wheel, evaporative coolers, solar air collectors and gas-fired auxiliary heater, it could directly tackle both the space load and ventilation load. Since the supply air flow is same as the outdoor air flow, the SADCS has a feature of sufficient ventilation that enhances the indoor air quality. Although it is inevitable to involve the auxiliary heater for regeneration of desiccant Wheel, it is possible to minimize its usage by the optimal design and control scheme of the SADCS. Through simulation–optimization approach, the SADCS can provide a satisfactory performance in the subtropical Hong Kong.
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simulation optimization of solar assisted desiccant cooling system for subtropical hong kong
Applied Thermal Engineering, 2010Co-Authors: K.f. Fong, T T Chow, L S ChanAbstract:Abstract Solar cooling is a novel approach, which primarily makes use of solar energy, instead of electricity, to drive the air-conditioning systems. In this study, solar-assisted desiccant cooling system (SADCS) was designed to handle the cooling load of typical office in the subtropical Hong Kong, in which half of the building energy is consumed by the air-conditioning systems. The SADCS mainly consisted of desiccant Wheel, Thermal Wheel, evaporative coolers, solar air collectors and gas-fired auxiliary heater, it could directly tackle both the space load and ventilation load. Since the supply air flow is same as the outdoor air flow, the SADCS has a feature of sufficient ventilation that enhances the indoor air quality. Although it is inevitable to involve the auxiliary heater for regeneration of desiccant Wheel, it is possible to minimize its usage by the optimal design and control scheme of the SADCS. Through simulation–optimization approach, the SADCS can provide a satisfactory performance in the subtropical Hong Kong.
Ben Richard Hughes - One of the best experts on this subject based on the ideXlab platform.
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Development of a natural ventilation windcatcher with passive heat recovery Wheel for mild-cold climates: CFD and experimental analysis
Renewable Energy, 2020Co-Authors: John Kaiser Calautit, Dominic O’connor, Paige Wenbin Tien, Shuangyu Wei, Conrad Allan Jay Pantua, Ben Richard HughesAbstract:Abstract User demand for increased internal Thermal comfort conditions have resulted in rising energy costs for space-heating consumption. The present study aims to recover the Thermal energy in ventilation exhaust air and transfer the energy to the incoming air, to be redistributed using natural ventilation windcatcher. A comprehensive review was carried out to explore heat recovery systems that can potentially be incorporated with natural ventilation wind catchers. A rotary heat recovery device suitable to be incorporated with a roof mounted multi directional windcatcher system was developed. Computational Fluid Dynamics (CFD) modelling and laboratory experimental tests were conducted to investigate the proposed system. In the first phase, a full-scale prototype of the passive rotary Thermal Wheel device was developed and tested in a crossflow channel to initially assess the concept and performance of the design. Two configurations of the passive heat recovery Wheel were tested: 20 and 32 radial blades. The second phase focused on investigating the integration of heat recovery Wheel into a windcatcher system. CFD modelling and scaled wind tunnel testing were conducted to assess the airflow and temperature distribution around the multi-directional windcatcher with a passive rotary Wheel. The results showed that the addition of the heat recovery Wheel rotating at 15 rpm reduced the indoor airflow speed between 14 and 30%, depending on the outdoor wind conditions. The system was able to provide the recommended fresh air rates when the outdoor wind speed was 1.5 m/s and higher. In addition to sufficient ventilation, the heat recovery system had a positive impact on the indoor air temperature, raising the temperature up to 3.7 °C depending on the indoor/outdoor conditions.
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Effect of Rotation Speed of a Rotary Thermal Wheel on Ventilation Supply Rates of Wind Tower System
Energy Procedia, 2015Co-Authors: Dominic O’connor, John Kaiser Calautit, Ben Richard HughesAbstract:Abstract This study explores the integration of a rotary Thermal Wheel into a wind tower system, specifically the effect of the rotation speed on the ventilation rate and heat recovery. Wind towers are capable of supplying recommended levels of supply air under a range of external conditions, integrating a rotary Thermal Wheel will cause a reduction in the air supply rates due to the blockage created by the Wheel. Using Computational Fluid Dynamics (CFD) analysis, the air supply rate and heat transfer of the rotary Thermal Wheel have been calculated for a range of rotation speeds between 0 rpm – 500 rpm. The recommended air supply rate of 8l/s/p is attained up to a rotation speed of 50 rpm; beyond this rotation speed the air supply rate is too low. The maximum temperature recovered across the rotary Thermal Wheel is measured as 1.77 °C at a rotation speed of 20 rpm. Using the two results gained from the analysis, an optimum operating range of the rotary Thermal Wheel can be determined between 5 rpm and 20 rpm. The technology presented here is subject to an international patent application (PCT/GB2014/052513).
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a study of passive ventilation integrated with heat recovery
Energy and Buildings, 2014Co-Authors: Dominic Oconnor, John Kaiser Calautit, Ben Richard HughesAbstract:To meet the demand for energy demand reduction in heating, ventilation and air-conditioning systems, a novel design incorporating a heat recovery device into a wind tower was proposed. The integrated system uses a rotary Thermal Wheel for heat recovery at the base of the wind tower. A 1:10 scale prototype of the system was created and tested experimentally in a closed-loop subsonic wind tunnel to validate the Computational Fluid Dynamics (CFD) investigation. Wind towers have been shown to be capable of providing adequate ventilation in line with British Standards and the Chartered Institution of Building Services Engineers (CIBSE) guidelines. Despite the blockage of the rotary Thermal Wheel, ventilation rates were above recommendations. In a classroom with an occupancy density of 1.8 m2/person, the wind tower with rotary Thermal Wheel was experimentally shown to provide 9 L/s per person at an inlet air velocity of 3 m/s, 1 L/s per person higher than recommended ventilation rates. This is possible with a pressure drop across the heat exchanger of 4.33 Pa. In addition to sufficient ventilation, the heat in the exhaust airstreams was captured and transferred to the incoming airstream, raising the temperature 2 °C, this passive recovery has the potential to reduce demand on space heating systems.
K.f. Fong - One of the best experts on this subject based on the ideXlab platform.
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Simulation–optimization of solar-assisted desiccant cooling system for subtropical Hong Kong
Applied Thermal Engineering, 2010Co-Authors: K.f. Fong, T T Chow, L S ChanAbstract:Abstract Solar cooling is a novel approach, which primarily makes use of solar energy, instead of electricity, to drive the air-conditioning systems. In this study, solar-assisted desiccant cooling system (SADCS) was designed to handle the cooling load of typical office in the subtropical Hong Kong, in which half of the building energy is consumed by the air-conditioning systems. The SADCS mainly consisted of desiccant Wheel, Thermal Wheel, evaporative coolers, solar air collectors and gas-fired auxiliary heater, it could directly tackle both the space load and ventilation load. Since the supply air flow is same as the outdoor air flow, the SADCS has a feature of sufficient ventilation that enhances the indoor air quality. Although it is inevitable to involve the auxiliary heater for regeneration of desiccant Wheel, it is possible to minimize its usage by the optimal design and control scheme of the SADCS. Through simulation–optimization approach, the SADCS can provide a satisfactory performance in the subtropical Hong Kong.
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simulation optimization of solar assisted desiccant cooling system for subtropical hong kong
Applied Thermal Engineering, 2010Co-Authors: K.f. Fong, T T Chow, L S ChanAbstract:Abstract Solar cooling is a novel approach, which primarily makes use of solar energy, instead of electricity, to drive the air-conditioning systems. In this study, solar-assisted desiccant cooling system (SADCS) was designed to handle the cooling load of typical office in the subtropical Hong Kong, in which half of the building energy is consumed by the air-conditioning systems. The SADCS mainly consisted of desiccant Wheel, Thermal Wheel, evaporative coolers, solar air collectors and gas-fired auxiliary heater, it could directly tackle both the space load and ventilation load. Since the supply air flow is same as the outdoor air flow, the SADCS has a feature of sufficient ventilation that enhances the indoor air quality. Although it is inevitable to involve the auxiliary heater for regeneration of desiccant Wheel, it is possible to minimize its usage by the optimal design and control scheme of the SADCS. Through simulation–optimization approach, the SADCS can provide a satisfactory performance in the subtropical Hong Kong.
