Showing papers on "Absorption refrigerator published in 2019"
TL;DR: In this paper, an experimental realization of a quantum absorption refrigerator in a system of three trapped ions, with three normal modes of motion coupled by a trilinear Hamiltonian such that heat transfer between two modes refrigerates the third.
Abstract: In recent years substantial efforts have been expended in extending thermodynamics to single quantum systems. Quantum effects have emerged as a resource that can improve the performance of heat machines. However in the fully quantum regime their implementation still remains a challenge. Here, we report an experimental realization of a quantum absorption refrigerator in a system of three trapped ions, with three of its normal modes of motion coupled by a trilinear Hamiltonian such that heat transfer between two modes refrigerates the third. We investigate the dynamics and steady-state properties of the refrigerator and compare its cooling capability when only thermal states are involved to the case when squeezing is employed as a quantum resource. We also study the performance of such a refrigerator in the single shot regime made possible by coherence and demonstrate cooling below both the steady-state energy and a benchmark set by classical thermodynamics. Studying quantum heat machines would extend our fundamental understanding of thermodynamics. Here, the authors report on absorption refrigeration within three normal modes of motion of a three-ion chain, studying performances using either thermal or squeezed states, also in the single-shot regime.
149 citations
TL;DR: In this paper, a novel renewable energy based trigeneration system is developed based on the utilization of solar and geothermal resources in a combined manner, which includes the following useful outputs, namely electricity, hydrogen and cooling.
75 citations
TL;DR: In this paper, a new solar-based, combined cooling, heating, and power system is designed and developed for the school of engineering at Urmia University in Urmia, Iran.
64 citations
TL;DR: In this paper, a thermodynamic investigation of solar power tower assisted multigeneration system with hydrogen production and liquefaction is presented for more environmentally-benign multi-generational outputs.
62 citations
TL;DR: In this article, a new general model of an integrated system consisting of a high-temperature proton exchange membrane fuel cell, a regenerator and an absorption cycle is proposed for waste heat recovery, where the absorption cycle can be functioned as either an absorption heat pump for heating or an absorption refrigerator for cooling.
53 citations
TL;DR: In this paper, a cogeneration system that includes a gas turbine, absorption chillers, boilers, and heat exchangers is modeled in EES software, and the system is studied in multiple scenarios.
52 citations
TL;DR: In this article, the authors performed an exergoeconomic analysis and multi-objective optimization of a novel solar-driven integrated system to produce electricity, hydrogen, and cooling.
50 citations
TL;DR: In this paper, the authors proposed a trigeneration system for cooling, heating, and power generation which is consisted of organic quadrilateral cycle (QLC) and cascade absorption-compression system.
47 citations
TL;DR: In this article, a double effect absorption chiller, an ejector refrigeration cycle, a proton exchange membrane electrolyzer, an amine-based CO2 capture system, an organic Rankine cycle, and a heater are used to produce electricity, cooling, heating, and hydrogen in summer and winter modes, in addition to removing CO2 from the flue gas of the cement plant.
42 citations
TL;DR: In this article, a novel SA-CCR system with an integrated air-cooled vapor compression refrigeration (ACR) cycle is proposed to meet the all-weather cooling/heating demand when solar inputs are insufficient.
42 citations
TL;DR: In this paper, an integrated energy system based on hydrogen fuel is developed and studied energetically and exergetically, where the liquefied hydrogen fueled solid oxide fuel cell (SOFC) based system is then integrated with a steam producing cycle to supply electricity and potable water to ships.
TL;DR: In this paper, a biomass and solar energy based system consisting of a gas turbine cycle, a reheat Rankine cycle, solar heliostat field, four-step copper-chlorine cycle and absorption cooling system is proposed, analyzed and comparatively evaluated through energy and exergy approaches.
TL;DR: In this article, the authors performed a techno-economic analysis of a trigeneration plant based on low temperature polymer electrolyte membrane fuel cells and half-effect absorption chillers.
TL;DR: In this article, the authors investigated an integrated dual temperature system for combined air conditioning and low to medium temperature refrigeration applications (−40°C to −10°C) which combines a steam driven parallel flow triple effect H2O−LiBr absorption cooling cycle with a CO2 refrigeration cycle.
TL;DR: In this article, a comparison between two different solar thermal technologies, namely Linear Fresnel Reflector (LFR) and evacuated tube solar collectors (ETC), integrated into a poly-generation plant is presented.
TL;DR: In this article, a novel biomass gasification-based combined cooling, heat and power (CCHP) system, which is composed of a gas-fueled internal combustion engine, variable-effect LiBr-H2O absorption cooling, and dehumidification air-conditioning with desiccant coated heat exchangers, was introduced.
TL;DR: In this paper, the authors proposed to integrate solid oxide fuel cell with gas turbine cycle, vapour absorption refrigeration system and organic Rankine cycle through the heat available with fluid in the cycle.
TL;DR: In this paper, a solar absorption-subcooled compression hybrid cooling system (SASCHCS) is developed to measure the operational performance of a high-rise building in sub-tropical Guangzhou.
TL;DR: In this paper, an integrated cycle of M-cycle and absorption chiller is proposed to reduce the air temperature in a gas turbine power plant without adding any moisture, which significantly reduces the total cost of the cooling process.
TL;DR: In this article, a new solar-assisted cooling, heating and power (CCHP) system was developed for improving the energy conversion efficiency in this work, where solar thermal energy collected by a parabolic trough solar collector is used to drive the thermochemical reaction of methanol decomposition, then the generated solar fuel in the form of syngas is fed into an internal combustion engine (ICE) to generate electricity.
TL;DR: In this paper, a concentrated solar-geothermal integrated system with a combined ejector-absorption refrigeration cycle is proposed and analyzed thermodynamically for a small community application.
Abstract: A concentrated solar-geothermal integrated system with a combined ejector-absorption refrigeration cycle is proposed and analyzed thermodynamically for a small community application. A detailed thermodynamic model is established for analysis and performance evaluation. A case of a small community in the Yukon Territory is chosen and the system provides all the necessary demands of electric power, space heating and cooling and domestic hot water at high performance. The overall energetic and exergetic efficiencies are 53.33% and 37.07%, respectively, while the COPen and COPex of the combined cooling cycle are 1.033 and 0.1131, respectively. In addition, numerous parametric studies are presented to illustrate the effects of several energy sources parameters on the overall performance of the integrated system and the combined cooling cycle. Furthermore, ejector parameters are controlled to get the highest COPen value of 1.164. Lastly, the integrated system is optimized exergetically to reach a value of 55.98%, while the overall energetic efficiency becomes 63.60%.
TL;DR: In this paper, the authors presented the integration of the evacuated tube solar collectors into a novel solar poly-generation plant, coupled with a multi-effect distillation unit for seawater desalination, a single effect water lithium bromide absorption chiller, a biomass auxiliary heater, heat exchangers, tanks and balance-of-plant devices.
TL;DR: In this article, a hybrid system including high-temperature polymer fuel cell with capacity of 5'kW along with fuel processing unit for producing rich hydrogen from natural gas integrated by a 3'kw absorption chiller has been developed.
Abstract: A hybrid system including high-temperature polymer fuel cell with capacity of 5 kW along with fuel processing unit for producing rich hydrogen from natural gas integrated by a 3 kW absorption chiller has been developed. The waste heat of flue gas from the burners is utilized in the ammonia-water absorption chiller for refrigerating purposes. The hybrid refrigeration system is simulated by Aspen HYSYS software in a steady state condition. After defining the properties of nanoparticles in HYSYS software, the water-based nanofluids are employed as absorbent liquid for increasing of COP in the refrigeration system, and their effects have been evaluated on overall system performance. The electrochemical model of the fuel cell as well as the main parameters of refrigeration system have been validated with experimental results and similar works. Electrical efficiency and overall efficiency of the hybrid system are equal to 36% and 77.3%, respectively. The overall efficiency in the presence of silver nanofluid can be increased up to 81%. Exergy analysis has been conducted for the hybrid system, and the obtained exergy efficiency of the system is equal to 29%. Sensitivity analysis has been employed for evaluating of significant parameters on the hybrid system performance.
TL;DR: In this article, an integrated solar heating and cooling system driven by parabolic trough collector (PTC) and double-effect H2O/LiBr absorption chiller was presented. But the authors did not consider the use of solar collectors during the cooling period, and was directly used for space heating with the integration of plate heat exchange during the heating period.
TL;DR: In this paper, the results of experiments conducted with a hybrid solar system integrating a concentrator, and computer simulations of the hybrid solar cooling system incorporating flat plate collectors and concentrator were presented.
TL;DR: According to the results, this system presents an alternative environmental friendly energy system that produces electricity, cooling and heating same time and operates most efficiently at the high temperature ratio of the working fluids of the Stirling engine and high collector surface temperature.
TL;DR: Li et al. as mentioned in this paper developed a novel calculation model using the Matlab language for the thermodynamic analysis of an absorption refrigeration system (ARS), which is an alternative to the conventional mechanical compression system for cold production.
Abstract: An absorption refrigeration system (ARS) is an alternative to the conventional mechanical compression system for cold production. This study developed a novel calculation model using the Matlab language for the thermodynamic analysis of ARS. It was found to be reliable in LiCl-H2O and LiBr-H2O ARS simulations and the parametric study was performed in detail. Moreover, two 50 kW water-cooled single effect absorption chillers were simply designed to analyze their off-design behaviors. The results indicate that LiCl-H2O ARS had a higher coefficient of performance (COP) and exergetic efficiency, particularly in the lower generator or higher condenser temperature conditions, but it operated more restrictively due to crystallization. The off-design analyses revealed that the preponderant performance of LiCl-H2O ARS was mainly due to its better solution properties because the temperature of each component was almost the same for both chillers in the operation. The optimum inlet temperature of hot water for LiCl-H2O (83 °C) was lower than that of LiBr-H2O (98 °C). The cooling water inlet temperature should be controlled within 41 °C, otherwise the performances are discounted heavily. The COP and cooling capacity could be improved by increasing the temperature of hot water or chilled water properly, contrary to the exergetic efficiency.
TL;DR: In this article, an off-design operation of a solar absorption-subcooled compression hybrid cooling system (SASCHCS) is subjected to the variation of solar irradiance and cooling load.
TL;DR: In this article, the authors proposed an absorption refrigeration system which employed two ejectors as cycle power source instead of mechanical pumps, and compared the performance of the combined double-ejector refrigeration cycle (DEARC) with the conventional air-cooled absorption refrigerator.
TL;DR: In this article, a comparison of solar trigeneration systems with single-effect LiBr-H2O absorption chillers and half-effect chillers is performed for different system layouts, obtained by coupling glazed and unglazed flat-plate photovoltaic thermal (PVT) collectors with single and half effect absorption chiller, respectively.