An overview of modelling techniques employed for performance simulation of low–grade heat operated adsorption cooling systems

Sah, Ramesh P.; Choudhury, Biplab; Das, Randip Kumar; Sur, Anirban

doi:10.1016/j.rser.2017.02.062

Cited by 46 publications

(17 citation statements)

References 82 publications

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“…Different models are available to describe adsorption equilibrium, i.e., the uptake, w [kg/kg] (the amount of water adsorbed onto the material) as a function of temperature T sorb , pressure p ads in the adsorber, as well as the heat of adsorption [60]. Among them, for the SAPO-34 sorbent considered, the Dubinin-Ashtakov (DA) correlation was selected [61]:…”

Section: Adsorption Modelmentioning

confidence: 99%

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Hybrid Adsorption-Compression Systems for Air Conditioning in Efficient Buildings: Design through Validated Dynamic Models

et al. 2019

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Hybrid sorption-compression systems are gaining interest for heating/cooling/ refrigeration purposes in different applications, since they allow exploiting the benefits of both technologies and a better utilization of renewable sources. However, design of such components is still difficult, due to the intrinsic complexity of the systems and the lack of reliable models. In particular, the combination of adsorption-compression cascade unit has not been widely explored yet and there are no simulations or sizing tools reported in the literature. In this context, the present paper describes a model of a hybrid adsorption-compression system, realised in Modelica language using the commercial software Dymola. The models of the main components of the sorption and vapour compression unit are described in details and their validation presented. In addition, the integrated model is used for proving the feasibility of the system under dynamic realistic conditions and an example of the technical sizing that the model is able to accomplish is given.

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Section: Adsorption Modelmentioning

confidence: 99%

“…m re f = m sorb dw dt (10) Uptake derivative depends on adsorption kinetics. A common approach to define is through the Linear Driving Force (LDF) [37,60,62]:…”

Section: Of 28mentioning

confidence: 99%

Hybrid Adsorption-Compression Systems for Air Conditioning in Efficient Buildings: Design through Validated Dynamic Models

et al. 2019

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“…Lots of papers deal with modeling of adsorption chillers, including heat exchangers, as their good design in such devices as sorption units, which are merely thermodynamic systems, is crucial for improving their performance [11,12]. For example, a state-of-the-art overview of adsorption cooling systems modeling techniques can be found in [25]. The authors classified the modeling techniques of adsorption chillers into three groups: heat and mass transfer models, lumped parameters models, and thermodynamic models [26].…”

Section: Introductionmentioning

confidence: 99%

“…The authors classified the modeling techniques of adsorption chillers into three groups: heat and mass transfer models, lumped parameters models, and thermodynamic models [26]. They underlined that a lot of research work is necessary to improve heat and mass transfer performance of adsorption chillers and more advanced, both simulation and optimization models, ought to be developed to allow the optimal design of the coolers [25]. A thermodynamic model of a three-bed adsorption chiller of a cooling capacity of 90 kW can be found in [27].…”

Section: Introductionmentioning

confidence: 99%

A General Approach in Optimization of Heat Exchangers by Bio-Inspired Artificial Intelligence Methods

Krzywański

2019

Energies

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The paper introduces the artificial intelligence (AI) approach as a general method for the design and optimization study of heat exchangers. Genetic Algorithms (GA) and Artificial Neural Networks (ANN) are applied in the paper. An AGENN model, combining Genetic Algorithms with Artificial Neural Networks, was developed and validated against the desired data on a large falling film evaporator. A broad range of operating conditions and geometric configurations are considered in the study. Four kinds of tubes are deliberated, including plain and enhanced tubes. Different tube pass arrangements, i.e., top-to-bottom, bottom-to-top, and side-by-side, are discussed. Finally, the effects of liquid refrigerant mass flow rate, as well as the number of flooded tubes on the performance of the evaporator, are analyzed. The total heat transfer rate of the evaporator, predicted by the model, is in good agreement with the desired data; the maximum error is lower than ±3%. The highest heat transfer rate of the evaporator is 1140.01 kW and corresponds to Turbo EHP tubes, and bottom-to-top tubes pass arrangements, which guarantee the best thermal energy conversion. The presented approach can be referred to as a complementary technique in heat exchanger design procedures, besides the common rating and sizing tasks. It is an effective and alternative method for the existing approaches, considering the complexity of analytical and numerical techniques as well as the high costs of experiments.Construction features of the direct-transfer-type heat exchangers are the base of their classification, according to the geometry of construction criterion. Considerable flexibility in heat exchangers design can be observed for tubular ones where tube diameter, the number of tubes, the tube length, the pitch of the tubes, and the tube arrangement can be easily modified. Tubular heat exchangers can be classified into double-pipe, shell-and-tube and spiral-tube-type heat exchangers as heat transfer coefficients in a spiral tube are higher than those in a straight one. Plate heat exchangers are built of thin plates (plain, wavy, or corrugated) forming flow channels and can be categorized into: gasketed plate (consists of a series of thin plates with corrugation or wavy surfaces that separate the fluids), spiral plate (formed by rolling two long, parallel plates into a spiral), and lamella (Ramen) type of heat exchanger (a set of parallel, thin plate channels or lamellae (flat tubes or rectangular channels) placed longitudinally in a shell) [2].Extended surface heat exchangers contain fins or appendages on primary heat transfer surfaces to increase the heat transfer area (usually on the gas side).According to the heat transfer mechanisms criterion, there can be distinguished: 1. single-phase convection on both sides, 2. single-phase convection on one side and two-phase convection on other side, 3. two-phase convection on both sides.Finally, according to the flow arrangements criterion, the following fluid-flow path through the heat exchanger can exist:...

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“…This systems has recently become an interesting field of research. The advantage of such a solution is the ability to use working pairs, which are fully environment-friendly and are characterized by simple working principles and long life time [1][2][3][4][5][6][7][8][9]. Moreover, the most important reasons for the use of adsorption heat pumps are simplicity, no moving parts, low maintenance requirements, and shock resistance.…”

Section: Introductionmentioning

confidence: 99%

Modeling the Performance of Water-Zeolite 13X Adsorption Heat Pump

Kowalska

Ambrożek

2017

Archives of Thermodynamics

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The dynamic performance of cylindrical double-tube adsorption heat pump is numerically analysed using a non-equilibrium model, which takes into account both heat and mass transfer processes. The model includes conservation equations for: heat transfer in heating/cooling fluids, heat transfer in the metal tube, and heat and mass transfer in the adsorbent. The mathematical model is numerically solved using the method of lines. Numerical simulations are performed for the system water-zeolite 13X, chosen as the working pair. The effect of the evaporator and condenser temperatures on the adsorption and desorption kinetics is examined. The results of the numerical investigation show that both of these parameters have a significant effect on the adsorption heat pump performance. Based on computer simulation results, the values of the coefficients of performance for heating and cooling are calculated. The results show that adsorption heat pumps have relatively low efficiency compared to other heat pumps. The value of the coefficient of performance for heating is higher than for cooling Keywords: Desorption; Adsorption; Mathematical simulation; Heat pump; Coefficient of performance Nomenclature A -adsorption potential, J/mol E0 -characteristic energy of the adsorbent, J/mol COP -coefficient of performance COP h -coefficient of performance for heating * Corresponding Author.

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An overview of modelling techniques employed for performance simulation of low–grade heat operated adsorption cooling systems

Cited by 46 publications

References 82 publications

Hybrid Adsorption-Compression Systems for Air Conditioning in Efficient Buildings: Design through Validated Dynamic Models

Hybrid Adsorption-Compression Systems for Air Conditioning in Efficient Buildings: Design through Validated Dynamic Models

A General Approach in Optimization of Heat Exchangers by Bio-Inspired Artificial Intelligence Methods

Modeling the Performance of Water-Zeolite 13X Adsorption Heat Pump

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