The Experts below are selected from a list of 4149 Experts worldwide ranked by ideXlab platform
Francesco Tariello - One of the best experts on this subject based on the ideXlab platform.
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Assessment of Energy, Environmental and Economic Performance of a Solar Desiccant Cooling System with Different Collector Types
Energies, 2014Co-Authors: Giovanni Angrisani, Maurizio Sasso, Carlo Roselli, Francesco TarielloAbstract:Desiccant-based air handling units can achieve reductions in greenhouse Gas emissions and energy savings with respect to conventional air conditioning systems. Benefits are maximized when they interact with renewable energy technologies, such as solar collectors. In this work, experimental tests and data derived from scientific and technical literature are used to implement a model of a solar desiccant cooling system, considering three different collector technologies (air, flat-plate and evacuated collectors). Simulations were then performed to compare the energy, environmental and economic performance of the system with those of a desiccant-based unit where regeneration thermal energy is supplied by a Natural Gas Boiler, and with those of a conventional air-handling unit. The only solution that allows achieving the economic feasibility of the solar desiccant cooling unit consists of 16 m 2 of evacuated solar collectors. This is able to obtain, with respect to the reference system, a reduction of primary energy consumption and of the equivalent CO 2 emissions of 50.2% and 49.8%, respectively, but with a payback time of 20 years.
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Dynamic performance assessment of a micro-trigeneration system with a desiccant-based air handling unit in Southern Italy climatic conditions
Energy Conversion and Management, 2014Co-Authors: Giovanni Angrisani, Maurizio Sasso, Carlo Roselli, Francesco TarielloAbstract:Abstract In this work, a system consisting of a small scale trigeneration system, in which a heat-led microcogenerator interacts with a desiccant-based cooling system, equipped with a silica-gel desiccant wheel, is analyzed. The system provides the air-conditioning service to a lecture room during summer and winter periods and, over the whole year, thermal energy for domestic hot water production to a nearby multifamily house. Electricity from the cogenerator is used to drive the electric chiller, the auxiliaries as well as further electric appliances of the lecture room. This trigeneration system is compared with a reference system, equipped with a conventional air handling unit, based on cooling dehumidification for summer air conditioning. Electricity to power the electric chiller, the auxiliaries, as well as electric appliances is drawn from the grid. Thermal energy for winter space heating, air post-heating during summer and domestic hot water purposes is provided by a Natural Gas Boiler. Experimental tests, as well as data derived from manufacturers, are used to implement a model of both systems. Simulations were then performed by means of TRNSYS software to compare their thermo-economic performance. A sensitivity analysis has been performed, to analyse the effect of the share of cogenerated electricity consumed on-site. The analysis shows encouraging results, given the Italian energy context for the small scale trigeneration system, in terms of primary energy consumption and equivalent carbon dioxide emissions reductions, with maximum values of 7.70% and 15.3%, respectively; on the other hand, it is difficult to achieve a reasonably short pay-back period for the system, even if it accesses all the support mechanisms introduced by Italian legislation for small scale Gas fuelled trigeneration systems and a very high amount of cogenerated electricity is used on-site.
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Dynamic performance assessment of a micro-trigeneration system with a desiccant-based air handling unit in Southern Italy climatic conditions
Energy Conversion and Management, 2014Co-Authors: Giovanni Angrisani, Maurizio Sasso, Carlo Roselli, Francesco TarielloAbstract:Abstract In this work, a system consisting of a small scale trigeneration system, in which a heat-led microcogenerator interacts with a desiccant-based cooling system, equipped with a silica-gel desiccant wheel, is analyzed. The system provides the air-conditioning service to a lecture room during summer and winter periods and, over the whole year, thermal energy for domestic hot water production to a nearby multifamily house. Electricity from the cogenerator is used to drive the electric chiller, the auxiliaries as well as further electric appliances of the lecture room. This trigeneration system is compared with a reference system, equipped with a conventional air handling unit, based on cooling dehumidification for summer air conditioning. Electricity to power the electric chiller, the auxiliaries, as well as electric appliances is drawn from the grid. Thermal energy for winter space heating, air post-heating during summer and domestic hot water purposes is provided by a Natural Gas Boiler. Experimental tests, as well as data derived from manufacturers, are used to implement a model of both systems. Simulations were then performed by means of TRNSYS software to compare their thermo-economic performance. A sensitivity analysis has been performed, to analyse the effect of the share of cogenerated electricity consumed on-site. The analysis shows encouraging results, given the Italian energy context for the small scale trigeneration system, in terms of primary energy consumption and equivalent carbon dioxide emissions reductions, with maximum values of 7.70% and 15.3%, respectively; on the other hand, it is difficult to achieve a reasonably short pay-back period for the system, even if it accesses all the support mechanisms introduced by Italian legislation for small scale Gas fuelled trigeneration systems and a very high amount of cogenerated electricity is used on-site.
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Selection of Solar Collectors Technology and Surface for a Desiccant Cooling System based on Energy, Environmental and Economic Analysis
Proceedings of 1st International e-Conference on Energies, 2014Co-Authors: Giovanni Angrisani, Maurizio Sasso, Carlo Roselli, Francesco TarielloAbstract:Desiccant-based air handling units allow significant reductions in greenhouse Gas emissions and energy savings with respect to conventional air conditioning systems. Benefits are maximized when they interact with renewable energy technologies, such as solar collectors. Due to the high requirements of humidifiers, water consumption is a major issue for desiccant cooling technology. Therefore, a water consumption analysis should be also performed.In this work, experimental tests and data derived from scientific and technical literature are used to implement a model of a solar desiccant cooling system, considering three different solar caption technologies (air, flat plate and evacuated collectors). Simulations were then performed to compare the energy, environmental and economic performance and water consumption of the system with those of a desiccant-based unit in which regeneration thermal energy is supplied by a Natural Gas Boiler, and with a conventional air handling device. A trade-off solution is chosen, consisting of 16 m2 of flat-plate solar collectors. This solution allows to obtain, with respect to the reference system, a reduction of primary energy consumption and of the equivalent CO2 emissions of 24.2% and 27.1%, respectively, with an acceptable pay-back time of 4.81 years, and a water consumption very similar to that of the reference system.
Lars Erik Øi - One of the best experts on this subject based on the ideXlab platform.
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Cost estimation of heat recovery networks for utilization of industrial excess heat for carbon dioxide absorption
International Journal of Greenhouse Gas Control, 2018Co-Authors: Hassan Ali, Anette Mathisen, Viktor Andersson, Fredrik Normann, Ragnhild Skagestad, Nils Henrik Eldrup, Lars Erik ØiAbstract:The absorption of CO2using solvents (e.g., amines) is considered a state-of-the-art, albeit energy-intensive process for CO2capture. While it is generally recognized that the utilization of waste heat has potential to reduce the energy-associated costs for CO2capture, the cost of waste heat recovery is seldom quantified. In this work, the cost of heat-collecting steam networks for waste heat recovery for solvent regeneration is estimated. Two types of networks are applied to waste heat recovery from the flue Gases of four process industries (cement, silicon, iron and steel, and pulp and paper) via a heat recovery steam generator (HRSG). A novel approach is presented that estimates the capital and operational expenditures for waste heat recovery from process industries. The results show that the overall cost (CAPEX + OPEX) of steam generated from one hot flue Gas source is in the range of 1.1-4.1 €/t steam. The cost is sensitive to economic parameters, installation factors, the overall heat transfer coefficient, steam pressure, and to the complexity of the steam network. The cost of steam from an existing Natural Gas Boiler is roughly 5-20-times higher than that of steam generated from recovered waste heat. The CAPEX required to collect the heat is the predominant factor in the cost of steam generation from waste heat. The major contributor to the CAPEX is the heat recovery steam generator, although the length of the steam pipeline (when heat is collected from two sources or over long distances) is also important for the CAPEX.
Giovanni Angrisani - One of the best experts on this subject based on the ideXlab platform.
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Numerical study of a MIL101 metal organic framework based desiccant cooling system for air conditioning applications
Applied Thermal Engineering, 2017Co-Authors: Piero Bareschino, Giovanni Angrisani, Carlo Roselli, Giuseppe Diglio, Francesco Pepe, Maurizio SassoAbstract:Abstract The use of a MIL101@GO-6 (MILGO) based Desiccant Wheel in a desiccant cooling system for air conditioning has been numerically studied. MILGO is a novel composite material, consisting of 6% w/w graphite oxide dispersed in the MIL101 metal organic framework network structure (J. Yan et al., Appl. Therm. Eng. 84, 118, 2015), and benefits from an outstanding water uptake, about 6 times greater than that of conventional silica gel adsorbent. A previously validated Gas side resistance mathematical model has been used to evaluate the performances of the MILGO based desiccant wheel, finding that its dehumidification effectiveness is about 30% higher than that of a conventional silica gel based desiccant wheel under the simulation conditions tested. Additionally, using a simplified effectiveness method, the performances of an air handling units equipped with this novel desiccant wheel, interacting with a cogenerator, an electric chiller and a Natural Gas Boiler, have been investigated in TRNSYS™ environment. The analysis showed that a MILGO based Air Handling Unit has better energy, environmental and economic performances than a conventional, silica gel based one with, in the best case scenario, a fuel energy saving ratio and equivalent CO2 avoided emission of 20.5%, and operating cost saving of 369 €·y−1.
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Assessment of Energy, Environmental and Economic Performance of a Solar Desiccant Cooling System with Different Collector Types
Energies, 2014Co-Authors: Giovanni Angrisani, Maurizio Sasso, Carlo Roselli, Francesco TarielloAbstract:Desiccant-based air handling units can achieve reductions in greenhouse Gas emissions and energy savings with respect to conventional air conditioning systems. Benefits are maximized when they interact with renewable energy technologies, such as solar collectors. In this work, experimental tests and data derived from scientific and technical literature are used to implement a model of a solar desiccant cooling system, considering three different collector technologies (air, flat-plate and evacuated collectors). Simulations were then performed to compare the energy, environmental and economic performance of the system with those of a desiccant-based unit where regeneration thermal energy is supplied by a Natural Gas Boiler, and with those of a conventional air-handling unit. The only solution that allows achieving the economic feasibility of the solar desiccant cooling unit consists of 16 m 2 of evacuated solar collectors. This is able to obtain, with respect to the reference system, a reduction of primary energy consumption and of the equivalent CO 2 emissions of 50.2% and 49.8%, respectively, but with a payback time of 20 years.
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Dynamic performance assessment of a micro-trigeneration system with a desiccant-based air handling unit in Southern Italy climatic conditions
Energy Conversion and Management, 2014Co-Authors: Giovanni Angrisani, Maurizio Sasso, Carlo Roselli, Francesco TarielloAbstract:Abstract In this work, a system consisting of a small scale trigeneration system, in which a heat-led microcogenerator interacts with a desiccant-based cooling system, equipped with a silica-gel desiccant wheel, is analyzed. The system provides the air-conditioning service to a lecture room during summer and winter periods and, over the whole year, thermal energy for domestic hot water production to a nearby multifamily house. Electricity from the cogenerator is used to drive the electric chiller, the auxiliaries as well as further electric appliances of the lecture room. This trigeneration system is compared with a reference system, equipped with a conventional air handling unit, based on cooling dehumidification for summer air conditioning. Electricity to power the electric chiller, the auxiliaries, as well as electric appliances is drawn from the grid. Thermal energy for winter space heating, air post-heating during summer and domestic hot water purposes is provided by a Natural Gas Boiler. Experimental tests, as well as data derived from manufacturers, are used to implement a model of both systems. Simulations were then performed by means of TRNSYS software to compare their thermo-economic performance. A sensitivity analysis has been performed, to analyse the effect of the share of cogenerated electricity consumed on-site. The analysis shows encouraging results, given the Italian energy context for the small scale trigeneration system, in terms of primary energy consumption and equivalent carbon dioxide emissions reductions, with maximum values of 7.70% and 15.3%, respectively; on the other hand, it is difficult to achieve a reasonably short pay-back period for the system, even if it accesses all the support mechanisms introduced by Italian legislation for small scale Gas fuelled trigeneration systems and a very high amount of cogenerated electricity is used on-site.
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Dynamic performance assessment of a micro-trigeneration system with a desiccant-based air handling unit in Southern Italy climatic conditions
Energy Conversion and Management, 2014Co-Authors: Giovanni Angrisani, Maurizio Sasso, Carlo Roselli, Francesco TarielloAbstract:Abstract In this work, a system consisting of a small scale trigeneration system, in which a heat-led microcogenerator interacts with a desiccant-based cooling system, equipped with a silica-gel desiccant wheel, is analyzed. The system provides the air-conditioning service to a lecture room during summer and winter periods and, over the whole year, thermal energy for domestic hot water production to a nearby multifamily house. Electricity from the cogenerator is used to drive the electric chiller, the auxiliaries as well as further electric appliances of the lecture room. This trigeneration system is compared with a reference system, equipped with a conventional air handling unit, based on cooling dehumidification for summer air conditioning. Electricity to power the electric chiller, the auxiliaries, as well as electric appliances is drawn from the grid. Thermal energy for winter space heating, air post-heating during summer and domestic hot water purposes is provided by a Natural Gas Boiler. Experimental tests, as well as data derived from manufacturers, are used to implement a model of both systems. Simulations were then performed by means of TRNSYS software to compare their thermo-economic performance. A sensitivity analysis has been performed, to analyse the effect of the share of cogenerated electricity consumed on-site. The analysis shows encouraging results, given the Italian energy context for the small scale trigeneration system, in terms of primary energy consumption and equivalent carbon dioxide emissions reductions, with maximum values of 7.70% and 15.3%, respectively; on the other hand, it is difficult to achieve a reasonably short pay-back period for the system, even if it accesses all the support mechanisms introduced by Italian legislation for small scale Gas fuelled trigeneration systems and a very high amount of cogenerated electricity is used on-site.
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Selection of Solar Collectors Technology and Surface for a Desiccant Cooling System based on Energy, Environmental and Economic Analysis
Proceedings of 1st International e-Conference on Energies, 2014Co-Authors: Giovanni Angrisani, Maurizio Sasso, Carlo Roselli, Francesco TarielloAbstract:Desiccant-based air handling units allow significant reductions in greenhouse Gas emissions and energy savings with respect to conventional air conditioning systems. Benefits are maximized when they interact with renewable energy technologies, such as solar collectors. Due to the high requirements of humidifiers, water consumption is a major issue for desiccant cooling technology. Therefore, a water consumption analysis should be also performed.In this work, experimental tests and data derived from scientific and technical literature are used to implement a model of a solar desiccant cooling system, considering three different solar caption technologies (air, flat plate and evacuated collectors). Simulations were then performed to compare the energy, environmental and economic performance and water consumption of the system with those of a desiccant-based unit in which regeneration thermal energy is supplied by a Natural Gas Boiler, and with a conventional air handling device. A trade-off solution is chosen, consisting of 16 m2 of flat-plate solar collectors. This solution allows to obtain, with respect to the reference system, a reduction of primary energy consumption and of the equivalent CO2 emissions of 24.2% and 27.1%, respectively, with an acceptable pay-back time of 4.81 years, and a water consumption very similar to that of the reference system.
Omar Abdelaziz - One of the best experts on this subject based on the ideXlab platform.
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new configurations of a heat recovery absorption heat pump integrated with a Natural Gas Boiler for Boiler efficiency improvement
Energy Conversion and Management, 2014Co-Authors: Ming Qu, Omar AbdelazizAbstract:Abstract Conventional Natural Gas-fired Boilers exhaust flue Gas direct to the atmosphere at 150–200 °C, which, at such temperatures, contains large amount of energy and results in relatively low thermal efficiency ranging from 70% to 80%. Although condensing Boilers for recovering the heat in the flue Gas have been developed over the past 40 years, their present market share is still less than 25%. The major reason for this relatively slow acceptance is the limited improvement in the thermal efficiency of condensing Boilers. In the condensing Boiler, the temperature of the hot water return at the range of 50–60 °C, which is used to cool the flue Gas, is very close to the dew point of the water vapor in the flue Gas. Therefore, the latent heat, the majority of the waste heat in the flue Gas, which is contained in the water vapor, cannot be recovered. This paper presents a new approach to improve Boiler thermal efficiency by integrating absorption heat pumps with Natural Gas Boilers for waste heat recovery (HRAHP). Three configurations of HRAHPs are introduced and discussed. The three configurations are modeled in detail to illustrate the significant thermal efficiency improvement they attain. Further, for conceptual proof and validation, an existing hot water-driven absorption chiller is operated as a heat pump at operating conditions similar to one of the devised configurations. An overall system performance and economic analysis are provided for decision-making and as evidence of the potential benefits. These three configurations of HRAHP provide a pathway to achieving realistic high-efficiency Natural Gas Boilers for applications with process fluid return temperatures higher than or close to the dew point of the water vapor in the flue Gas.
Zhen Li - One of the best experts on this subject based on the ideXlab platform.
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Evaluation of a flue Gas driven open absorption system for heat and water recovery from fossil fuel Boilers
Energy Conversion and Management, 2016Co-Authors: Zhenying Wang, Xiaoyue Zhang, Zhen LiAbstract:This paper presents an open absorption system for total heat recovery from fossil fuel Boilers using the high temperature flue Gas as the regeneration heat source. In this system, liquid desiccant serves as the recycling medium, which absorbs waste heat and moisture contained in the low temperature flue Gas in the packed tower and then regenerates in the regenerator by the high temperature flue Gas. Water vapor generated in the regenerator gets condensed after releasing heat to the heating water system and the condensing water also gets recycled. The return water collects heat from the solution water heat exchanger, the flue Gas water heat exchanger and the condenser respectively and is then used for district heating. Driven by the vapor pressure difference between high humidity flue Gas and the liquid desiccant, the heat recovery efficiency of the system is not limited by the dew point of the flue Gas, enabling a warmer water to be heated up than the conventional condensing Boiler. The performance of this system was analyzed theoretically and experimentally and the results showed that the system operated well for both district heat supply and domestic hot water supply. The system efficiency increased with the moisture content of flue Gas and the total heat recovery was about 8.5%, 17.2%, 21.2%, and 9.2% higher than the conventional condensing system in the case of coal fired Boiler, fuel oil Boiler, Natural Gas Boiler, and coke oven Gas Boiler, respectively.