A complete review of working fluids of absorption cycles is presented. Absorption cycles contain absorption heat pumps, absorption chillers and absorption transformers. Working fluids are divided into five series according to different absorbents.

A review of working fluids of absorption cycles

A review of chemical heat pumps, thermodynamic cycles and thermal energy storage technologies for low grade heat utilisation

Theoretical study on the effect of operating conditions on performance of absorption refrigeration system

Numerical analysis of air-foil shaped fin performance in printed circuit heat exchanger in a supercritical carbon dioxide power cycle

The key technical barrier to using water/lithium bromide (LiBr) as the working fluid in air-cooled absorption chillers and absorption heat-pump systems is the risk of crystallization when the absorber temperature rises at fixed evaporating pressure. This article reviews various crystallization control technologies available to resolve this problem: chemical inhibitors, heat and mass transfer enhancement methods, thermodynamic cycle modifications, and absorption system-control strategies. Other approaches, such as boosting absorber pressure and J-tube technology, are reviewed as well. This review can help guide future efforts to develop water/LiBr air-cooled absorption chillers and absorption heat-pump systems.

State-of-the-art review on crystallization control technologies for water/LiBr absorption heat pumps

Cycle analysis of air-cooled absorption chiller using a new working solution

The objectives of this paper are to measure the heat transfer and pressure drop of the plate heat exchangers for absorption system applications. Three types of plate heat exchangers with different chevron angles are tested in the present experiment. Heat transfer and pressure drop performance of plate heat exchangers are measured in various operating conditions, and compared each other. The results show that the heat transfer rate of high theta (120°) and mixed theta plate heat exchanger increases about 118% and 98% at the solution flow rate 350 kg/h compared to that of low theta (60°), respectively. The effectiveness of high theta was evaluated about 0.53 ~ 0.85 in this experimental range. The experimental correlations of the Nu and f were developed with error bands of ±7% and ±12%.

Performance Evaluation of Plate Heat Exchanger with Chevron Angle Variations

Cooling characteristics of ground source heat pump with heat exchange methods

This research was concerned with the enhancement of heat transfer by surfactant added to the aqueous solution of LiBr. Different vertical tubes were tested with and without an additive of normal octyl alcohol. The test tubes are a bare inner surface, a groove inner surface, a corrugated inner surface and a spring inserted inner surface tubes, The additive concentration was about 0,08 mass%. The heat transfer coefficient was measured as a function of the film Reynolds number in the range of 2 0~200. Experiments were carried out at higher cooling water temperature of 35℃ to simulate an air cooling condition for several kinds of absorber testing tubes, The experimental results were compared with and without surfactant. The enhancement of heat transfer by Marangoni convection effect which was generated by addition of the surfactant is observed in each test tube. Especially. it is clarified that the tube with an inserted spring has the highest enhancement effect.

Enhancement of Heat and Mass Transfer by Insert Spring in a Vertical Absorber with Surfactant

http://www.ndsl.kr/soc_img/society/kspse/DRGGBE/2013/v17n1/DRGGBE_2013_v17n1_7.pdf

Research and Development of Sea Water Heat Pump

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