A novel hybrid adsorption heat transformer – multi-effect distillation (AHT-MED) system for improved performance and waste heat upgrade

2022 ◽  
Vol 305 ◽  
pp. 117744
Author(s):  
Sagar Saren ◽  
Sourav Mitra ◽  
Takahiko Miyazaki ◽  
Kim Choon Ng ◽  
Kyaw Thu
Keyword(s):  
Waste Heat ◽  
Adsorption Heat ◽  
Improved Performance ◽  
Heat Transformer

Application of absorption heat transformer to recover waste heat from a synthetic rubber plant

2003 ◽  
Vol 23 (7) ◽  
pp. 797-806 ◽  
Author(s):  
Xuehu Ma ◽  
Jiabin Chen ◽  
Songping Li ◽  
Qingyun Sha ◽  
Aiming Liang ◽  
...  
Keyword(s):  
Waste Heat ◽  
Rubber Plant ◽  
Synthetic Rubber ◽  
Heat Transformer

Use of the Linear Driving Force Approximation in Adsorption Heat Pump and Chiller Modeling

2009 ◽  
Author(s):  
Alex Raymond ◽  
Srinivas Garimella
Keyword(s):  
Mass Transfer ◽  
Driving Force ◽  
Waste Heat ◽  
Heat Pumps ◽  
Adsorption Heat ◽  
Activated Carbon Fiber ◽  
Fickian Diffusion ◽  
Half Cycle ◽  
Linear Driving Force ◽  
Adsorption Heat Pump

Adsorption heat pumps and chillers can utilize solar or waste heat to provide space conditioning, process heating or cooling, or energy storage. In these devices, accurate modeling of intraparticle adsorbate mass transfer is an important part of predicting overall performance. The linear driving force (LDF) approximation is often used for modeling intraparticle mass transfer in place of the more detailed Fickian diffusion (FD) equation for its computational simplicity. This paper directly compares the adsorbate contents predicted by the conventional LDF approximation, an empirical LDF approximation proposed by El-Sharkawy et al. [1], and the FD equations for cylindrical adsorbent fibers such as activated carbon fiber (ACF). The conditions under which the LDFs agree with the FD equation are then evaluated. It is shown that for a given working pair, agreement between the LDF and FD equations is affected by the diffusivity, particle radius, half-cycle time, initial adsorbate content, and equilibrium adsorbate content. The maximum possible error in adsorbate content predicted by the LDF approximation compared with the FD solution is then calculated for the ACF (A-20)-ethanol working pair. Although the maximum error will be different for other cases, the technique used in this paper can be reproduced to determine the greatest possible LDF error for any working pair.

Discussion about Practical use of Continuous Type Adsorption Heat Pump using Honeycomb Rotor for Low-Temperature Waste Heat Recovery

2002 ◽  
Vol 2002 (0) ◽  
pp. 63-64
Author(s):  
Ken Kuwahara ◽  
Bidyut Saha ◽  
Shigeru Koyama ◽  
Katsuhiko Furukawa ◽  
Keishi Nishihara ◽  
...  
Keyword(s):  
Low Temperature ◽  
Heat Pump ◽  
Heat Recovery ◽  
Waste Heat Recovery ◽  
Waste Heat ◽  
Adsorption Heat ◽  
Continuous Type ◽  
Adsorption Heat Pump

Adiabatic Absorption by Absorbent Atomization for Improving Absorption Heat Transformer Performance

2020 ◽  
Vol 142 (5) ◽  
Author(s):  
Yigal Evron ◽  
Khaled Gommed ◽  
Gershon Grossman
Keyword(s):  
Distribution System ◽  
Distribution Systems ◽  
Waste Heat ◽  
Heat Pumps ◽  
Low Grade ◽  
Liquid Distribution ◽  
Experimental Step ◽  
Higher Temperature ◽  
Future Work ◽  
Heat Transformer

Abstract Absorption heat transformers (AHTs) are a type of absorption heat pumps that are primarily driven by low-grade (typically waste) heat and produce higher temperature (high-grade) heat. Under the Indus3Es project, a 10 kW LiBr-H2O “Lab Scale” absorption heat transformer was built as a first experimental step toward larger scales. The focus was on the high-pressure vessel (HPV) (absorber and evaporator) design. To enhance performance, the aim was to obtain complete adiabatic absorption prior to the main absorption process accompanied by heat transfer. This maximizes the temperature within the absorber. This is particularly beneficial for absorption heat transformers, compared to chillers, because obtaining an elevated temperature is the objective. To obtain adiabatic absorption, atomizing spray nozzles were used as the liquid absorbent distribution system. This method proved successful; complete adiabatic absorption was obtained before the droplets contacted the absorber heat exchange surfaces. However, the spray nozzles must be supplied with pressurized liquid and are potentially more delicate than alternative liquid distribution systems. Therefore, future work may focus on determining the required atomization level to avoid excessive pressures and nozzle requirements.

scholarly journals Improved performance of binder-free zeolite Y for low-temperature sorption heat storage

2018 ◽  
Vol 6 (24) ◽  
pp. 11521-11530 ◽  
Author(s):  
Alenka Ristić ◽  
Fabian Fischer ◽  
Andreas Hauer ◽  
Nataša Zabukovec Logar
Keyword(s):  
Low Temperature ◽  
Heat Recovery ◽  
Waste Heat Recovery ◽  
Heat Storage ◽  
Waste Heat ◽  
Zeolite Y ◽  
Binder Free ◽  
Improved Performance ◽  
Sorption Heat ◽  
Modified Binder

Improved performance of modified binder-free zeolite Y in mobile sorption heat storage for low-temperature industrial waste heat recovery.

Exergy Analysis of Various Absorption Heat Transformer Systems Using Classical and Modified Gouy–Stodola Equation

2015 ◽  
Vol 23 (01) ◽  
pp. 1550006 ◽  
Author(s):  
T. Goel ◽  
G. Sachdeva
Keyword(s):  
Exergy Analysis ◽  
Waste Heat ◽  
Lithium Bromide ◽  
Second Law ◽  
Operating Parameters ◽  
Classical Approach ◽  
Exergy Destruction ◽  
Second Law Analysis ◽  
Heat Transformer ◽  
Study Performance

In the present study, performance evaluation of three different configurations of absorption heat transformer (AHT) is carried out by supplying the waste heat of same mass and same temperature; and exergy analysis is done using both the classical and modified Gouy–Stodola equation. For this a mathematical model is developed for all the three arrangements in Engineering Equation Solver. Water–lithium bromide is used as a working pair. The results of exergy destruction with classical and modified Gouy–Stodola equation are compared for different systems. Further various operating parameters are varied to predict the performance of the systems on the basis of second law analysis. The result showed that the amount of hot fluid produced in absorber is more for system 3 as compared to other configurations. The irreversibility calculated by the modified approach comes out to be 25.78%, 23.60%, and 23.45% more than the exergy destruction obtained by the classical approach in the three cases, respectively. Thus, there is a need to employ the modified approach of Gouy–Stodola equation for calculating the real irreversibility which helps in predicting the scope of improvement and the performance of the system more accurately.

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