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Absorption Refrigeration

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Guangming Chen – One of the best experts on this subject based on the ideXlab platform.

  • Experimental evaluation of a 1.x-effect ejector-Absorption Refrigeration system
    Applied Thermal Engineering, 2019
    Co-Authors: Xiaona Yan, Yuqi Shi, Lin Wang, Daliang Hong, Guangming Chen

    Abstract:

    Abstract In this paper, a 1.x-effect (hybrid ejector-Absorption Refrigeration working between single-effect and double-effect) cycle is evaluated experimentally. Through the use of the ejector, the external heat sources’ grade is reduced. Part of the refrigerant vapor at the outlet of the low-pressure generator is directly entrained by the refrigerant vapor from the outlet of the high-pressure generator to the condenser. The system with 10 kW cooling load is experimentally studied. The COP of the system is 30.0% higher than a single-effect Absorption Refrigeration system, and generation temperature is at least 20 °C lower than a double-effect Absorption Refrigeration system.

  • A potential auto-cascade Absorption Refrigeration system for pre-cooling of LNG liquefaction
    Journal of Natural Gas Science and Engineering, 2015
    Co-Authors: Yijian He, Guangming Chen, Yi Wang

    Abstract:

    Low temperature cooling is required during production or recovery processes of the liquefied natural gas (LNG). An Absorption Refrigeration system for pre-cooling of LNG production or recovery, which can be powered by low-grade thermal energy and produce low temperature cooling, could provide great potential of energy saving by recovering waste heat. An auto-cascade Absorption Refrigeration (ACAR) system is investigated for potential pre-cooling of LNG liquefaction in this context. Under the actuating heat with a temperature of 122.5°C, a minimum Refrigeration temperature of-52.9°C is obtained by the ACAR system. An experimental COPr value of the ACAR system reaches 0.011 with a Refrigeration temperature of-52.9°C. For an Absorption Refrigeration system, used for re-liquefaction of a LNG bulk gas carrier by utilizing exhaust engine heat with a temperature of 145°C, the required minimum value of COPr is about 0.05 with a Refrigeration temperature of-30°C. However, under the actuating heat with a temperature of 120°C, the minimum value becomes about 0.023 with a Refrigeration temperature of-53°C. Therefore, performance of the experimental ACAR prototype is approaching the basic requirements for re-liquefaction of a LNG bulk gas carrier, which could utilize exhaust engine heat. Based on the theoretical COPr values of the ACAR system, it is found that its energy saving could be equivalent to that of an ammonia/water Absorption Refrigeration system for pre-cooling of LNG liquefaction. Moreover, the ACAR system could show good performance in broader operational conditions. Besides, it overcomes some drawbacks on the manufactured materials and operational maintenance of an ammonia/water Absorption Refrigeration system. In summary, an ACAR system could provide pre-cooling at lower temperatures for LNG liquefaction by utilizing waste heat and show comprehensive advantages over an ammonia/water Absorption Refrigeration system. Hence, it shows good potential for pre-cooling of LNG liquefaction, especially for re-liquefaction of a LNG bulk gas carrier.

  • Simulation research on an EAX (Evaporator-Absorber-Exchange) Absorption Refrigeration cycle
    Energy, 2010
    Co-Authors: Daliang Hong, Guangming Chen, L.m. Tang

    Abstract:

    There are some heat sources whose temperature is much higher than the limited generation temperature of conventional single effect Absorption Refrigeration cycle but lower than that of conventional double effect Absorption Refrigeration cycle. These heat sources can not be utilized efficiently by prior cycles. To make efficient use of these heat sources, this paper proposed an EAX (Evaporator-Absorber-Exchange) Absorption Refrigeration cycle. The proposed cycle can make use of the condensing heat of the vapor separated from high temperature generator to make additional Refrigeration. Therefore, the COP (Coefficient of Performance) of the proposed cycle is much higher than that of the conventional single effect cycle. Simulation results show that the COP of the EAX cycle can be 40% higher than that of the conventional single effect cycle at some simulated conditions.

Eiji Hihara – One of the best experts on this subject based on the ideXlab platform.

  • a new Absorption Refrigeration cycle using solar energy
    Solar Energy, 1999
    Co-Authors: Guangming Chen, Eiji Hihara

    Abstract:

    Abstract A new type of Absorption Refrigeration cycle that is co-driven both by solar energy and electricity was evaluated. The principle of a heat transformer was applied to the Absorption Refrigeration system to increase its efficiency. In this paper, a thermodynamic model describing the performance of the new cycle was developed and a computer program was written to evaluate its performance. The COP, condenser heat load, the theoretical minimum evaporating temperature and Refrigeration capacity for a typical daily load of the system were calculated and compared with those of traditional Absorption Refrigeration systems. The results show that the new cycle not only overcomes some shortcomings of the traditional Absorption cycle with unsteady energy input from a variable source such as solar energy, but also increases the system’s coefficient of performance.

Zhang Yong-gui – One of the best experts on this subject based on the ideXlab platform.

  • Analysis on Application of Solar Energy Thermal Storage with Phase Change to Absorption Refrigeration
    Energy Conservation Technology, 2012
    Co-Authors: Zhang Yong-gui

    Abstract:

    A kind of new air-conditioning system applying solar energy thermal storage technology with phase change to two-level Absorption Refrigeration is introduced,and the device structure,working principle as well as application benefits are analyzed briefly.We measured the change relationship between outflow water temperature of heat release coil and that of time in the heat release process of thermal storage device with phase change by experiment,then analyzed the efficiency of two-level Absorption Refrigeration system.The study presents that this solar energy air-conditioning system effectively solves instability and intermittent existing in the previous system;Solar energy thermal storage device with phase change has the advantages of small size,large amount of thermal storage,big exothermic velocity,uniform continuous exothermic temperature,easily controlling heating temperature of heat source,etc.It’s suitable for storing solar energy and providing heating source for Absorption Refrigeration system.Cowprehensively considering the production features that the equipment is simple and the requirement is low,the Absorption Refrigeration driven by solar energy or other low grade heat sources has a good protential for future development.

  • Research of Application of Solar Energy Thermal Storage with Phase Change to Absorption Refrigeration
    , 2012
    Co-Authors: Zhang Yong-gui

    Abstract:

    A kind of new air-conditioning system applying solar energy thermal storage technology with phase change to two-level Absorption Refrigeration is introduced,and the device structure,working principle as well as application benefits is analyzed briefly.Measure the change relationship between outflow water temperature of heat release coil and that of time in the heat release process of thermal storage device with phase change by experiment,then the efficiency of two-level Absorption Refrigeration system is analyzed.Through the study it′s known that this solar energy air-conditioning system effectively solves instability and intermittent problems existing in the previous system;Solar energy thermal storage device with phase change has the advantages of small size,large amount of thermal storage,big exothermic velocity,uniform continuous exothermic temperature,easily controlling heating temperature of heat source,etc.It′s suitable for storing solar energy and providing heating source for Absorption Refrigeration system.Considering the production feature that the equipment is simple and the requirement is low comprehensively,as a result,the Absorption Refrigeration driven by solar energy or other low grade heat source has a good development prospect.