Experimental results of an absorption-compression heat pump using the working fluid ammonia/water for heat recovery in industrial processes

Markmann, B.; Tokan, T.; Loth, Maximilian; Stegmann, Jan; Hartmann, Kilian; Kruse, Holger; Kabelac, Stephan

doi:10.1016/j.ijrefrig.2018.10.010

Cited by 10 publications

(5 citation statements)

References 6 publications

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“…Besides the generally important reduction of pressure losses upstream of the pump inlet, the external subcooling of the lean solution, as used by Rane et al (1989) [51], is one possible solution. Additionally, experiments with an upstream booster pump or a special design of the separator to provide enough static height of the liquid level for the pressure increase upstream of the solution pump have been investigated by various researchers [44,55,56]. Furthermore, Risberg et al (2004) [23] and Markmann et al (2019) [56] introduced an option to control the liquid level in the high-pressure receiver by regulating the expansion valve to keep the low pressure stable and reduce the risk of cavitation due to rapid pressure changes.…”

Section: Solution Pump Solutionsmentioning

confidence: 99%

Identification of Existing Challenges and Future Trends for the Utilization of Ammonia-Water Absorption–Compression Heat Pumps at High Temperature Operation

et al. 2021

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Decarbonization of the industrial sector is one of the most important keys to reducing global warming. Energy demands and associated emissions in the industrial sector are continuously increasing. The utilization of high temperature heat pumps (HTHPs) operating with natural fluids presents an environmentally friendly solution with great potential to increase energy efficiency and reduce emissions in industrial processes. Ammonia-water absorption–compression heat pumps (ACHPs) combine the technologies of an absorption and vapor compression heat pump using a zeotropic mixture of ammonia and water as working fluid. The given characteristics, such as the ability to achieve high sink temperatures with comparably large temperature lifts and high coefficient of performance (COP) make the ACHP interesting for utilization in various industrial high temperature applications. This work reviews the state of technology and identifies existing challenges based on conducted experimental investigations. In this context, 23 references with capacities ranging from 1.4 kW to 4500 kW are evaluated, achieving sink outlet temperatures from 45 °C to 115 °C and COPs from 1.4 to 11.3. Existing challenges are identified for the compressor concerning discharge temperature and lubrication, for the absorber and desorber design for operation and liquid–vapor mixing and distribution and the choice of solution pump. Recent developments and promising solutions are then highlighted and presented in a comprehensive overview. Finally, future trends for further studies are discussed. The purpose of this study is to serve as a starting point for further research by connecting theoretical approaches, possible solutions and experimental results as a resource for further developments of ammonia-water ACHP systems at high temperature operation.

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Section: Solution Pump Solutionsmentioning

confidence: 99%

Identification of Existing Challenges and Future Trends for the Utilization of Ammonia-Water Absorption–Compression Heat Pumps at High Temperature Operation

et al. 2021

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“…In their study, Markmann et al [15] utilized a natural ammonia/water pair to optimize a 50 kW hybrid absorption-compression heat pump. The simulation results indicated a maximum Coefficient of Performance (COP) of 2.5.…”

Section: Introductionmentioning

confidence: 99%

Investigation of Heat Transfer Performance in Deionized Water–Ethylene Glycol Binary Mixtures during Nucleate Pool Boiling

Xu,

Ren,

Qian

et al. 2024

Processes

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Pool boiling heat transfer is recognized as an exceptionally effective method, widely applied across various industries. The adoption of non-azeotropic binary mixtures aligns with the environmental objectives of modern industrial development and enhances the coefficient of performance (COP) in numerous systems. Therefore, investigating the boiling heat transfer characteristics of these mixtures is crucial to improving their industrial usability. In this study, mixtures of ethylene glycol and deionized water (EG/DW) in varying concentrations were chosen as the working fluids. A comprehensive experimental setup was developed, followed by a series of experiments to assess their pool boiling performance. Simultaneously, the thermophysical parameters of these mixtures underwent detailed examination and analysis. The research revealed that the concentration of EG in the mixture markedly affects its thermal properties and temperature glide, both of which are crucial in influencing the heat transfer coefficient. Additionally, six established heat transfer coefficient prediction correlations, primarily designed for pure fluids, have been employed. However, their application to non-azeotropic mixtures under experimental conditions revealed significant deviations. To address this issue, the present study modified existing correlations with the temperature slip characteristics of non-azeotropic mixtures. This process involved recalibrating the wall superheat values in the correlations to reflect the local temperature differential at the boiling point, thereby customizing them for application to non-azeotropic mixtures. The modified correlations highlighted the unique behaviors of non-azeotropic mixtures in boiling heat transfer, demonstrating improved compatibility with these mixtures in a deviation within a permissible 20% range compared with experimental results.

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“…Schweigler 28 studied the steadystate thermodynamic process of an absorptioncompression cycle and promising results were obtained including enhancing temperature lift without crystallization, reducing the required driving temperature and increasing refrigeration capacity. Markmann 29 31 performed a comprehensive review on hybrid absorption-compression heat pumps and concluded that the hybrids had many advantages, including flexible operating range, large temperature lift, and high energy efficiency. However, selection of new working fluids for the hybrid absorption-compression cycles was required in-depth investigation to obtain excellent overall performance and expand the application fields.…”

Section: Introductionmentioning

confidence: 99%

“…Schweigler 28 studied the steady‐state thermodynamic process of an absorption‐compression cycle and promising results were obtained including enhancing temperature lift without crystallization, reducing the required driving temperature and increasing refrigeration capacity. Markmann 29 exploited a hybrid system using H 2 O/NH 3 as working fluid, which was able to cover heating demand around 373.15 K and supply additional chilled water. Wu 30 carried out study on the absorption‐compression cycle with IL/NH 3 mixtures.…”

Section: Introductionmentioning

confidence: 99%

Thermodynamic performance of absorption‐compression hybrid refrigeration cycles based on lithium nitrate+1‐butyl‐3‐methylimidazolium nitrate/water working fluid

Wang

Li²,

Luo

2020

Int J Energy Res

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In this paper, LiNO 3 (lithium nitrate)-[BMIM]NO 3 (1-butyl-3-methylimidazolium nitrate)/H 2 O is presented for absorption-compression hybrid refrigeration. The thermophysical properties and corrosion of this ternary system were measured. The performance of this hybrid system using LiNO 3-[BMIM]NO 3 / H 2 O was studied and compared with those based on LiBr (lithium bromide)/ H 2 O, LiNO 3 /H 2 O, and LiNO 3-[MMIM][DMP] (1,3-dimethylimidazolium dimethylphosphate)/H 2 O. Results showed that the hybrid refrigeration cycles can work at much lower generator and evaporator temperatures in comparison with the pure absorption cycle. Generator temperatures of both hybrid cycles based on this working fluid were lower than those using the other working fluids. At different refrigeration temperatures, the generator temperatures of both hybrid cycles using this presented working fluid were reduced about 7 and 10 K, respectively, in comparison with those based on LiBr/ H 2 O. Compared with other working fluids, both single-and double-effect hybrid systems using this new working fluid achieved a larger coefficient of performance around 0.88 and 1.6, respectively. Additionally, the exergetic efficiency for both hybrid cycles is also about 10% larger than that using LiBr/ H 2 O. And this working fluid shows an excellent thermal stability below 598.32 K and acceptable high-temperature anti-corrosion to metallic materials. Moreover, the hybrid cycle using LiNO 3-[BMIM]NO 3 /H 2 O of 80 kW has a shorter payback period of 5.51 years when utilizing solar energy as the driven heat source. Therefore, LiNO 3-[BMIM]NO 3 /H 2 O shows great advantages in the absorption-compression hybrid cycles.

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Experimental results of an absorption-compression heat pump using the working fluid ammonia/water for heat recovery in industrial processes

Cited by 10 publications

References 6 publications

Identification of Existing Challenges and Future Trends for the Utilization of Ammonia-Water Absorption–Compression Heat Pumps at High Temperature Operation

Identification of Existing Challenges and Future Trends for the Utilization of Ammonia-Water Absorption–Compression Heat Pumps at High Temperature Operation

Investigation of Heat Transfer Performance in Deionized Water–Ethylene Glycol Binary Mixtures during Nucleate Pool Boiling

Thermodynamic performance of absorption‐compression hybrid refrigeration cycles based on lithium nitrate+1‐butyl‐3‐methylimidazolium nitrate/water working fluid

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