Showing papers on "Absorption refrigerator published in 2023"
TL;DR: In this article , the authors proposed a novel cogeneration system using geothermal and natural gas dual-sources, which is a combination of the gas turbine cycle with thermophysical recuperation, double-flash geothermal cycle, parallel dual-pressure Kalina cycle, and single-effect absorption cooling cycle for simultaneous power and cooling production.
24 citations
TL;DR: In this article , a geothermal-driven multigeneration system based on Sabalan geothermal wells is proposed to produce power, heating, cooling, and hydrogen fuel, which can achieve energy and exergy efficiencies of 34.2% and 66.3%, respectively.
Abstract: Recently, the development and exploitation of renewables-driven multigeneration systems can be a sensible solution to reduce the limitations of fossil energies and their negative environmental impacts. The combination of two geothermal and solar energies, in addition to reducing the installation costs of solar systems, can support the efficiency improvement of the geothermal-driven energy systems. In addition, the use of suitable downstream cycles in such energy conversion processes can improve thermodynamic and economic performances. The coefficient of performance offered by a generator absorber heat exchanger-based refrigeration cycle can be higher than that by the ejector and absorption refrigeration processes. A comprehensive thermodynamic-conceptual and exergoeconomic evaluations as well as two-objective optimization on a new geothermal-driven multigeneration system, based Sabalan geothermal wells, has been developed in this paper. The proposed system is able to produce power, heating, cooling, and hydrogen fuel. In the developed configuration the geothermal source is considered as the main source of energy production and a linear Fresnel reflector-based solar unit produces a portion of the required thermal power of the system. Further, a single-flash cycle, a water electrolysis unit (based on alkaline electrolyzer cell), and a generator absorber heat exchanger unit are embedded to generate various forms of energy. The overall outcomes indicated that the proposed system can produce 4.1 MW of electric power, 1.67 MW of heating load and 1.46 MW of cooling load. In addition, the hydrogen production rate of the energy process is equal to 5.75 kg/h. In such a context, the considered process can achieve energy and exergy efficiencies of almost 34.2% and 66.3%, respectively. Based on the optimization findings, the energy efficiency can be improved by approximately 9.75% according to the optimal input data. Additionally, the total product unit cost rate can be reduced by almost 4.3% at the same time. Relying on a parametric analysis, variables affecting the performance of the considered system are identified. The conceptual design of the solar unit is also presented regarding the geographical and climatic data of the desired region.
11 citations
TL;DR: In this paper , a new solar heliostat-based generation unit is suggested for electricity generation as the crucial product, and a multi-aspect optimization is implemented to identify the optimum decision values, regarding four various scenarios, namely exergy performance/ sum unit cost of the product.
Abstract: Solar energy-driven generation units can assist in moderating energy-linked environmental issues. For this target, a new solar heliostat-based generation unit is suggested for electricity generation as the crucial product. A heliostat-based solar unit with a closed Brayton cycle and thermal energy storage unit is coupled with a Kalina cycle and an absorption refrigeration unit through a single-effect absorption chiller as an inimitable series of power plants. Exergy, economic, and energy investigations are carried out to scrutinize the efficiency of the introduced unit, and a thorough parametric evaluation is performed. Multi-aspect optimization is implemented to identify the optimum decision values, regarding four various scenarios, namely exergy performance/ sum unit cost of the product, exergy performance/ coefficient of performance, NPV/exergy performance, and exergy performance/ cooling load. In this regard, The Grey Wolf Optimizer is the multi-objective optimization method, and TOPSIS, LINMAP, and Shannon entropy approaches assist the optimization procedure in acquiring the optimal solution in each scenario. The results indicate that the optimized exergy performance, coefficient of performance, and sum unit cost of the product are computed as 33.48 %, 0.817, and 3.44 $/GJ, respectively.
9 citations
TL;DR: In this article , the authors focused on design of a sustainable tri-generation system driven by a biomass (MSW: municipal solid waste) externally-fired gas turbine cycle and utilizing a double-effect absorption chiller/heater.
7 citations
TL;DR: In this paper , a newly hybrid solar/biomass-powered integrated multi-generation plant with a thermoelectric generator unit for supplying multiplex commodities has been studied in the current research.
7 citations
TL;DR: In this paper , an innovative multi-generation energy system is proposed to generate simultaneous power, drinking water, cooling, heating, and H2, which is surveyed comprehensively based on the thermodynamic, thermo-economic, and exergoenvironmental indicators for offering an in-depth assessment of the plant.
Abstract: An innovative multi-generation energy system is proposed to generate simultaneous power, drinking water, cooling, heating, and H2. The aimed plant comprised of an absorption chiller, a heat pump unit, a reverse osmoses unit, a double flash cycle, and a proton exchange membrane. The devised system is surveyed comprehensively based on the thermodynamic, thermo-economic, and exergoenvironmental indicators for offering an in-depth assessment of the plant. Besides, multi-objective optimization has been employed in the proposed system. The net proportions of output work, unit cost, thermal and exergetic efficiencies, and H2, and purified water production of the system are 99.25 kW, 124 $/GJ, 24.4%, 32.1%, 1.218 kg/h, and 0.9662 kg/s, separately. The outcomes related to thermodynamic and thermo-economic evaluations demonstrate that the greatest amount of total cost rate occurred in the first employed turbine. Owing to the findings of the parametric study, by increasing geothermal temperature, exergoenvironmental parameters are reduced, and with increasing the pressure of FT1, cooling load and energetic efficiency increase while SUCP, net output work, and exergetic efficiency decrease dramatically.
4 citations
TL;DR: In this paper , a 5 kW kerosene-fueled proton exchange membrane fuel cell-based cogeneration system consisting of a steam reforming reactor, pressure swing absorption, combustor, and heat collector is proposed for heating and power production.
4 citations
TL;DR: In this paper , a low-temperature heat driven ammonia-water combined absorption cycle is studied from a thermodynamic and exergoeconomic point of view, where a partial admission turbine has been added in parallel to the cooling production line for the production of electricity.
4 citations
TL;DR: In this paper , a residential combined cooling, heating and power (CCHP) system, consisting of a biomass gasifier, a proton exchange membrane fuel cell (PEMFC) stack, an absorption chiller and auxiliary equipment, is proposed.
3 citations
TL;DR: In this article , the authors proposed a comprehensive analysis of CBM operation, which is coupled with electrical and absorption chillers (ACs), energy storage, and renewable-based units like solar and wind power under a multiobjective optimization (MOO) technique.
Abstract: The paramount role of microgrids (MGs) in strengthening the energy network and supply of many users in more cost-effective, safe, and sustainable manner cannot be overlooked. Energy carriers' interdependence on each other, as well as the rapid rise of tri-generation technologies, provide several obstacles to ensuring the network's best performance. A combined-cooling heat and power (CCHP) system based on various renewable-based resources and MGs is capable of supplying electricity, thermal, and cooling loads, in which the operation of CHP-based MG (CBM) is heavily influenced by the interaction between these carriers. On this basis, this paper is proposed a comprehensive analysis of CBM operation, which is coupled with electrical and absorption chillers (ACs), energy storage, and renewable-based units like solar and wind power under a multi-objective optimization (MOO) technique. In addition, a Power-to-Gas (PtG) technology is utilized in the proposed system to enhance the overall operation, reduce CO2 emission, and to contribute to the cooling and heat supply in the presence of various uncertainties. The suggested MOO methodology evaluates the operation cost of the system as the first objective and the reduction of CO2 emission as the second objective. An epsilon-constrained approach and Pareto solution are considered to assess the methodology. As a result, this study examines the system's reliance on individual carriers as well as the interdependence of those carriers. The results reveal the effectiveness of the proposed model to reduce CO2 emission and operational costs.
3 citations
TL;DR: In this article , a novel hybrid system that can produce power, cooling, freshwater, and liquid hydrogen from a single energy source was designed and analyzed, and the system's performance was evaluated by thermodynamic and economic analyses, and a sensitivity analysis was conducted to investigate the effects of some key parameters on the operation mode.
TL;DR: In this article , the authors proposed an innovative trigeneration process with high sustainability index utilizing three stages of sequential heat recovery, including a two-stage Rankine cycle boosted by a thermoelectric generator and an ejector refrigeration unit, and a polymer electrolyte membrane electrolyzer.
Abstract: The establishment of new multigeneration processes is comparable and assessable from the sustainability viewpoint. Indeed, the sustainability approach assists the economic analysis leading to appropriate combination methods. Concerning the energetic flow exhausting a solid oxide fuel cell system, this study proposes an innovative trigeneration process with high sustainability index utilizing three stages of sequential heat recovery. The process encompasses a two-stage Rankine cycle boosted by a thermoelectric generator and an ejector refrigeration unit, and a polymer electrolyte membrane electrolyzer. This system is simulated in engineering equation solver software and a comprehensive sensitivity study is accomplished. It is concluded that the most influential parameter in the whole framework is the operational temperature of the stack and in the integrated process is turbine 1 pressure. Afterward, an advanced evolutionary optimization method is employed using the MATLAB software, and the optimal point is designated from the sustainability and economic standpoints. The optimal state reveals the sustainability index of 2.61 and total unit cost of 35.93 $/GJ, improved by 12.5% and 3.8% against the base case, respectively. Besides, the electric power, cooling, and hydrogen are correspondingly produced at 389.4 kW, 112.4 kW, and 0.45 kg/h, resulting in exergy efficiency and exergoeconomic factor of 57.75% and 52.1%, respectively.
TL;DR: In this article , an artificial neural network is implemented to optimize the system's operation, and the accuracy of four artificial neural networks in optimizing and predicting systems' performance is compared, and four double-objective and four tripleobjective optimization scenarios are considered to achieve the best optimum state from different viewpoints.
TL;DR: In this paper , a micro-gas turbine (MGT) combined cooling, heating and power system coupled with low concentrating photovoltaic/thermal heat hump (LCPV/T-HP) and absorption chiller is proposed.
TL;DR: In this paper , the feasibility of combining halogenated hydrocarbon-based working pairs with low-pressure compression-assisted absorption refrigeration system (LCARS) was proved from the experimental perspective.
TL;DR: In this article , the performance of the supercritical carbon dioxide Brayton cycle with printed circuit heat exchanger was analyzed under controlled freezing-point storage condition, and the results showed that the cycle energy and exergy efficiency were improved by 4.19%, 0.73% and 3.64% compared with combined cycle performance before optimization.
TL;DR: In this paper , a cascade absorption-compression refrigeration system using two-stage compression with complete intercooling (ACRSI) is proposed, and a mathematic model based on energy, exergy, economic and environmental analyses is developed to evaluate the system performance at five operation parameters including condensation temperature as well as the evaporation temperatures and the cooling capacities in two cooling temperature ranges.
TL;DR: In this paper , an artificial intelligence (AI) tool was used to predict and minimize flow maldistribution of membrane-based absorbers used in absorption refrigeration systems driven by renewable/waste energy.
TL;DR: In this paper , an absorption heat transformer (AHT) is coupled with the VARS (Vapour absorption refrigeration system) system which increases temperature of this waste heat, and the upgraded heat is utilized to produce required refrigeration effect.
TL;DR: In this article , the authors present a system based on solar thermal energy, biomass, and an air-cooled absorption chiller that are integrated to control the temperature of a greenhouse for tomato production in Mediterranean climates.
TL;DR: In this paper , a single-bubble heat and mass transfer model was established to investigate the bubble absorption for LiBr-H2O under vacuum condition, and the experimental results showed the relative deviation is less than 11.9%.
TL;DR: In this article , a unique integrated cooling and power system in which waste heat from a gas turbine (GT) cycle is collected and used to generate electricity via a supercritical CO2 (sCO2) recompression Brayton cycle and an organic Rankine cycle (ORC).
Abstract: This study proposes and explores a unique integrated cooling and power system in which waste heat from a gas turbine (GT) cycle is collected and used to generate electricity via a supercritical CO2 (sCO2) recompression Brayton cycle (sCO2RBC) and an organic Rankine cycle (ORC). An absorption refrigeration cycle (ARC) recovers waste heat from the sCO2RBC in order to provide a cooling impact. An energy analysis is carried out where mathematical modelling has been performed by a validated one-dimensional Python code. For working fluids e.g., air, combustion/exhaust gas, and NH3–H2O solution, property equations are used for obtaining the properties of respective state points. Impacts of different parameters are investigated on the total power output, net cooling effect and net energy utilization. The work emphasizes on modeling a novel integrated cooling and heating power system that utilizes the next generation sCO2 cycle, as well as other conceivable combinations, to effectively and reliably recover the waste heat. The analysis reveals that except for difference in the temperature in the hot side of the generator, all of the parameters increase resulting in an increase in net work done. The increase in temperature at inlet of GT, pressure ratio of the RBC, the decrease in GT pressure ratio, isentropic efficiency of GT, and lastly the temperature variation in the hot side of absorption refrigeration cycle generator affects the co-efficient of performance (COP) & energy utilization factor (EUF) of combined system. The EUF achieves a highest value of 49.09% and COP of 0.72.
TL;DR: In this article , a hybrid solar/wind system is proposed to satisfy the electrical and cooling demands, and hot water consuming of a building, where the primary energy of the compression chiller is supplied by a wind turbine and photovoltaic (PV) panels and the required thermal energy of absorption chiller are supplied through evacuated tube collectors (ETCs).
TL;DR: In this paper , a modified approach of the eco-energy analysis is proposed to apply to these purposes, which consists in modifying the existing environmental life cycle metrics by considering the CO2 emission from human labor (which provides the workers with goods and services) during refrigerator maintenance and the emission during the manufacturing of the power intensive components of the refrigerator.
TL;DR: In this paper , the authors used CRITIC and Shannon's entropy to obtain the criteria weights, and by introducing a novel weight integration method, the weights were combined to get the final weights.
TL;DR: In this article , a double-effect absorption refrigeration system using a low-temperature working pair, lithium bromide (LiBr)+1-butyl-3methylimidazolium bromides ([BMIM]Br)/ethanol (C2H5OH), was proposed to reduce the driving heat source temperature and enlarge the operation range to subzero temperatures.
TL;DR: In this paper , a single/double-effect switching LiBr-H2O absorption refrigeration system was investigated to make full use of solar energy and give full play to the advantages of solar refrigeration systems.
Abstract: In this study, a solar single/double-effect switching LiBr-H2O absorption refrigeration system was investigated to make full use of solar energy and give full play to the advantages of solar refrigeration systems. A corresponding thermodynamic dynamic mathematical model was developed. The operation characteristics of the system operating continuously for one week were analyzed. In order to highlight the advantages of the solar single/double-effect switching absorption refrigeration system, it was compared with other forms of solar refrigeration systems and compression refrigeration systems. The practical application potential of the single/double-effect switching LiBr-H2O absorption refrigeration system was evaluated from the perspective of economy and environmental effect. The results showed that the system could achieve the switching operation between single-effect mode and double-effect mode under weather conditions of high solar radiation intensity, and the daily cooling efficiency on such days was relatively high. After an auxiliary heater was added, the primary energy savings of the solar single/double-effect switching LiBr-H2O absorption refrigeration system were 25–52%, depending on the area of the collector and the volume of the storage tank. The solar fraction of the system was about 71.99% for continuous operation during the whole refrigeration season. However, the initial investment cost of the system equipment accounted for 89.66% of the total cost. Compared with the traditional compression refrigeration system, the initial investment cost of the solar single/double-effect switching LiBr-H2O absorption refrigeration system was higher, but it had a better environmental protection effect.