The Experts below are selected from a list of 28416 Experts worldwide ranked by ideXlab platform
Rene Rieberer - One of the best experts on this subject based on the ideXlab platform.
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experimental analysis of a novel concept of a thermally driven Solution Pump operating a small capacity ammonia water absorption heat Pumping system
International Journal of Refrigeration-revue Internationale Du Froid, 2015Co-Authors: Gerald Zotter, Rene RiebererAbstract:Abstract Only a few electrical Solution-Pumps are available on the market suitable for ammonia/water absorption heat Pumping systems with an evaporator capacity lower than 20 kW. In order to improve this, a “thermally-driven” Solution-Pump is proposed, offering several advantages, as e.g. an oil-free, simple and leak-proof design. “Thermally-driven” means this Pump is driven by a power process within the absorption heat Pumping-cycle instead of electricity. The experimental analysis of this novel Pump operating in a commercially available ammonia/water-absorption chiller shows that it can be easily integrated and works without any relevant operating limits. However, the measured COP of the considered chiller is decreased by at least 0.1 (15%) by this thermal-Pump compared to the existing electrical-Pump. Nevertheless, thermal energy (e.g. cost and CO 2 -free waste heat) can be used to drive this Pump and due to lower production cost it can be an interesting alternative from an economical and ecological point of view.
Yongchan Kim - One of the best experts on this subject based on the ideXlab platform.
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experimental study of operating characteristics of compression absorption high temperature hybrid heat Pump using waste heat
Renewable Energy, 2013Co-Authors: Jiyoung Kim, Seong Ryong Park, Youngjin Baik, Ki Chang Chang, Minsung Kim, Yongchan KimAbstract:This research describes the development of a compression/absorption hybrid heat Pump system that utilizes a mixture of NH3 and H2O as a working fluid. The heat Pump cycle is based on a hybrid combination of vapor compression cycle and absorption cycle. The system consists of major components of two-stage compressors, absorbers, and a desorber. There are also auxiliary parts like a desuperheater, Solution heat exchangers, a Solution Pump, a rectifier, and a liquid/vapor separator to support stable operation of the heat Pump. This compression/absorption hybrid heat Pump provides many advantages of performance over conventional vapor compression heat Pumps including a large temperature glide, an improved temperature lift, a flexible operating range, and greater capacity control. These benefits are optimized by changing the composition of the mixture. In this study, the effect of the composition on the operating characteristics of the compression/absorption hybrid heat Pump was experimentally observed.
Kong Xiangqiang - One of the best experts on this subject based on the ideXlab platform.
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a novel absorption compression combined refrigeration cycle activated by engine waste heat
Energy Conversion and Management, 2020Co-Authors: L I Jianbo, Cui Fulin, Han Xiaolong, Zhang Chen, Kong XiangqiangAbstract:Abstract Absorption refrigeration is an admirable means of refrigeration to use waste heat and decrease electricity and power consumption in air conditioning and refrigeration. A novel absorption–compression combined refrigeration cycle, which is driven by waste heat from the internal combustion engine of overload vehicles, vessels, or diesel generating sets, is proposed and investigated in this study. The high-pressure generator and the low-pressure generator are activated by exhaust gases and coolant liquids from the engine, respectively. Correspondingly, the high- and low-pressure compressors and Solution Pump are driven by the output power from the engine. The proposed refrigeration cycle can use the waste heat of the engine to the greatest extent and decrease engine power consumption. First, the thermodynamic circle model of the combined system was constructed. Then, the model was solved under different control strategies and operating modes. Theoretical calculation results show that the proposed combined cycle had a higher performance coefficient compared with compression refrigeration. The calculation results can be used as a reliable design, control strategy, and optimization tool for the combined refrigeration cycle future utilization in overload vehicles, vessels, or diesel generating sets.
R Best - One of the best experts on this subject based on the ideXlab platform.
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characteristics of an ammonia lithium nitrate double effect heat Pump transformer
Applied Thermal Engineering, 2016Co-Authors: Christopher Heard, W Rivera, R BestAbstract:Abstract The modelled operating characteristics of an ammonia/lithium nitrate double effect absorption heat Pump-transformer (Type III absorption heat Pump) are presented and compared to other working pair options and absorption heat Pump cycles. Heat and mass balance equations are given. The effect of sub-optimal cycle design is shown on cycle thermal efficiency and Solution Pump power. It is shown that the ammonia/lithium nitrate working pair would achieve a performance a little less efficient than a water/lithium bromide system but is somewhat more tolerant of less than optimum operating conditions with respect to cycle thermal efficiency and Solution Pump power. Ratios of useful heat delivered to driving heat of nearly four are shown to be achievable with this system.
Gerald Zotter - One of the best experts on this subject based on the ideXlab platform.
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experimental analysis of a novel concept of a thermally driven Solution Pump operating a small capacity ammonia water absorption heat Pumping system
International Journal of Refrigeration-revue Internationale Du Froid, 2015Co-Authors: Gerald Zotter, Rene RiebererAbstract:Abstract Only a few electrical Solution-Pumps are available on the market suitable for ammonia/water absorption heat Pumping systems with an evaporator capacity lower than 20 kW. In order to improve this, a “thermally-driven” Solution-Pump is proposed, offering several advantages, as e.g. an oil-free, simple and leak-proof design. “Thermally-driven” means this Pump is driven by a power process within the absorption heat Pumping-cycle instead of electricity. The experimental analysis of this novel Pump operating in a commercially available ammonia/water-absorption chiller shows that it can be easily integrated and works without any relevant operating limits. However, the measured COP of the considered chiller is decreased by at least 0.1 (15%) by this thermal-Pump compared to the existing electrical-Pump. Nevertheless, thermal energy (e.g. cost and CO 2 -free waste heat) can be used to drive this Pump and due to lower production cost it can be an interesting alternative from an economical and ecological point of view.