Numerical Results on Operating Parameters Influence for a Heat Recovery Adsorption Machine

In this study, an analytical quasi-steady state thermodynamic cycle of an adsorption cooling system (ACS) for automotive applications is presented which allows evaluating impact of different parameters on the ACS performance as well as effects of various working pairs: zeolite 13X/water, zeolite 4A/water and activated carbon-35/methanol. A comprehensive parametric study has been performed to investigate effects of temperature variation of the evaporator and condenser as well as the ICE exhaust gas temperature on the COP, cooling load produced by the evaporator and entropy generation of ACS with (or without) the heat recovery cycle (HRC). The results show that using the heat recovery cycle in the ACS can increase the COP of system up to 41% for zeolite 13X/water pair at the base-line condition. In addition, the parametric study shows that increasing regeneration and evaporation temperature increase the COP and entropy generation of ACS while increasing condensation temperature has negative effect on the COP and entropy generation. Finally, based on our modeling results, the ACS with the heat recovery cycle (HRC) and zeolite 13X/water pair are proposed for the automotive A/C applications.

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“…Removed sensible heat from the adsorber bed during the isosteric cooling process is calculated by Eq. (13).…”

Section: Thermodynamic Modelmentioning

confidence: 99%

“…Chekirou et al [13] used the model of Cassiola et al [6] for the activated carbon-35/methanol ACS and investigated the effects of heat recovery cycle on the performance. Their results showed that the heat recovery cycle improved the COP of ACS.…”

Section: Introductionmentioning

confidence: 99%

A Quasi Steady State Model for Adsorption Cooling Systems: Automotive Applications

Sharafianardakani

Bahrami

2012

ASME 2012 6th International Conference on Energy Sustainability, Parts a and B

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“…System performance with heat recovery could be improved up to 50% [38][39][40]. All the existing models contain certain simplifications in the basic equations that result sometimes in numerical instabilities Douss et al [41].…”

Section: Introductionmentioning

confidence: 99%

Performance evaluation of a waste-heat driven adsorption system for automotive air-conditioning: Part I – Modeling and experimental validation

Verde

Harby

Boer

et al. 2016

Energy

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Adsorption systems driven by engine waste heat are one of the possible alternatives to the conventional automobile air conditioning in terms of energy savings and environmental issues. Assessment of this issue are carried in a two-part study. In this first part I, theoretical and experimental investigations were performed on a two bed, silica gel adsorption chiller for automotive applications. A prototype adsorption system with a total weight of about 86 kg was developed and tested to driven by low-grade waste heat. The single adsorbent bed consisted of three plate-fin heat exchangers connected in parallel. An improved nonequilibrium lumped parameter model was developed to predict the transient performance of the system. The model is fully dynamic and takes into account the mass transfer resistance and pressure drop for each component of the system. The results showed that the model is able to accurately predict the dynamic performance of the system under different operating conditions and configuration modes with a short calculation time. The tested chiller was able to produce an average cooling capacity of about 2.1 kW with a COP of 0.35 at the rated operating conditions. Heat recovery system results in increasing the COP by 43% and the cooling power by 4%.

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“…(18) represents the heat absorbed by the evaporation of the refrigerant (adsorbate) at the evaporation temperature T e . The second term represents the sensible heat necessary to bring the condensate of its condensing temperature T c to evaporating temperature T e (Chekirou et al 2011). Tables 1 and 2 give all the relevant data of numerical computation.…”

Section: Coefficient Of Performancementioning

confidence: 99%

Effect of heating time of adsorber-collector on the performance of a solar adsorption refrigerator

Cherrad

Benchabane

Sedira

et al. 2017

Int J Mech Mater Eng

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This paper presents a numerical study of heat transfer inside the adsorber-collector of a solar adsorption refrigerator using the activated carbon AC35-methanol pair. The objective is to estimate the amount of the heat loss through the adsorber-collector, during the solar heating phase, and to determine the effect of heating time on the thermal efficiency of the system. The numerical results showed that the heating time is the most important factor affecting the amount of energy loss. It has shown that the shorter heating time corresponds to the higher efficiency of the adsorber-collector. In addition, a new optimal coefficient of performance, COP optm , is proposed to determine the number of adsorbers to be added to a machine. This latter is considered for consuming an energy equivalent to that received by the adsorber-collector. These additional adsorbers use a heat transfer fluid, coming from the adsorber-collector, instead of direct heating by solar radiation. An application example is presented using experimental results obtained from the literature. It has shown that the number of the additional adsorbers can reach three adsorbers.

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Numerical Results on Operating Parameters Influence for a Heat Recovery Adsorption Machine

Cited by 13 publications

References 14 publications

A Quasi Steady State Model for Adsorption Cooling Systems: Automotive Applications

A Quasi Steady State Model for Adsorption Cooling Systems: Automotive Applications

Performance evaluation of a waste-heat driven adsorption system for automotive air-conditioning: Part I – Modeling and experimental validation

Effect of heating time of adsorber-collector on the performance of a solar adsorption refrigerator

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