The Numerical Comparison of Heat Transfer in a Coated and Fixed Bed of an Adsorption Chiller

Grabowska, Karolina; Sosnowski, Marcin; Sztekler, Karol; Kalawa, Wojciech; Żyłka, Anna; Nowak, Wojciech

doi:10.1007/s11630-018-1035-y

Cited by 38 publications

(15 citation statements)

References 13 publications

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“…The low heat source temperatures, for which the chiller can operate, is lower than the often exploit, above 55 o C and stands for the innovative design of the cooler [18,19].…”

Section: S1055mentioning

confidence: 99%

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An adaptive neuro-fuzzy model of a re-heat two-stage adsorption chiller

et al. 2019

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Since the adsorption chillers do not use primary energy as driving source the possibility to employ low temperature waste heat sources in cooling energy production receives nowadays much attention of the industry and science community. However, the performance of the thermally driven adsorption systems is lower than that of other heat driven heating/cooling systems. Low coefficients of performance are one of the main disadvantages of adsorption coolers. It is the result of a poor heat transfer coefficient between the bed and the immersed heating surfaces of a built-in heat exchanger system. The purpose of this work is to study the effect of thermal conductance values of sorption elements and evaporator as well as other design parameters on the performance of a reheat two-stage adsorption chiller. One of the main energy efficiency factors in cooling production, i. e. cooling capacity for wide-range of both design and operating parameters is analyzed in the paper. Moreover, the work introduces artificial intelligence approach for the optimization study of the adsorption cooler. The ANFIS was employed in the work. The increase in both the bed and evaporator conductance provides better performance of the considered innovative adsorption chiller. The highest obtained value of cooling capacity is 21.7 kW and it can be achieved for the following design and operational parameters of the considered reheat twostage adsorption chiller:

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“…The low heat source temperatures, for which the chiller can operate, is lower than the often exploit, above 55 o C and stands for the innovative design of the cooler [18,19].…”

Section: S1055mentioning

confidence: 99%

“…The analyzed re-heat two-stage chiller consists of four adsorbent beds, one evaporator and one condenser as well as metallic tubes for heat transfer fluid and refrigerant flows [18,19]. Silica gel-water constitutes a working pair.…”

Section: An Object Of Investigationsmentioning

confidence: 99%

An adaptive neuro-fuzzy model of a re-heat two-stage adsorption chiller

et al. 2019

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“…43°C.Their operating cost is much lower as compared with other types of chillers;; they have a long lifetime and are not dependent on power supply. Adsorption chillers also have some disadvantages including their large dimensions and mass, considerable development costs or high design requirements due to the necessity of maintaining very low pressures [1,2,3,4,12,13,14,15]. This analysis concerns the impact of an adsorption chiller on a gas and steam cycle utilising a gas turbine is Siemens SGT5-4000F [11].…”

Section: Analysis and Modelingmentioning

confidence: 99%

Integration of adsorption chillers with combined cycle gas turbine

et al. 2019

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More efficient use of the primary energy contained in fuels translates into tangible earnings for power plants while reductions in the amounts of fuel burned, and of non-renewable resources in particular, certainly have a favourable impact on the natural environment. The main aim of the paper is to investigate the contribution of theuse of adsorption chillers to improve the production energy efficiencyin combined cycle gas turbine. Simulation calculations were performed using Sim tech's IPSEPro software.

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“…Innovative modification of the sorbent layer structure, improving the heat transfer characteristics in the heat exchanger boundary layer was proposed in [49]. The use of CFD methods with conjugate heat transfer analysis, to determine the crucial input parameters in a heat exchanger of an adsorption chiller was discussed in [50].…”

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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The Numerical Comparison of Heat Transfer in a Coated and Fixed Bed of an Adsorption Chiller

Cited by 38 publications

References 13 publications

An adaptive neuro-fuzzy model of a re-heat two-stage adsorption chiller

An adaptive neuro-fuzzy model of a re-heat two-stage adsorption chiller

Integration of adsorption chillers with combined cycle gas turbine

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

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