Experimental investigation of mass recovery adsorption refrigeration cycle

Akahira, Akira; Alam, Khurshid; Hamamoto, Yoshisuke; Akisawa, Atsushi; Kashiwagi, Takao

doi:10.1016/j.ijrefrig.2004.10.001

Cited by 75 publications

(50 citation statements)

References 8 publications

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“…The adsorber is a flange connection which makes the replacement of the sample very convenient. The volumes of the buffer tank and adsorber are 23091.58 and 80.99 cm 3 , respectively. The temperatures of water are measured by thermocouples with precisions of ±0.1°C, and the system pressure is measured with two calibrated pressure transducers with ranges of 0-1 MPa and precisions of 0.1% FS.…”

Section: Performance Testmentioning

confidence: 99%

“…The NH 3 uptake, w, on the composite adsorbent is calculated by the following equation: where T 1 and T 2 are the temperatures of the buffer tank and adsorber (K), respectively, V 1 and V 2 are the volume of the buffer tank (including the volumes associated with pipes and valves) and adsorber, respectively, V ad is the volume occupied by the adsorbents; p 0 is the initial pressure in the buffer tank (Pa), p eq is the equilibrium pressure of reaction (Pa), and R is the gas constant of NH 3 …”

Section: Performance Testmentioning

confidence: 99%

“…Adsorption refrigeration systems powered by low grade thermal energy such as waste heat or solar energy have drawn considerable attention due to the benefits of simple control, silent operation with no vibrations and lower operation costs [1,2]. However, the widespread acceptance of the adsorption systems is hindered by its relatively poor performances and large size due to limited properties of adsorbents [3]. The adsorption capacity of physical adsorbents can hardly exceed 30wt% [4].…”

mentioning

confidence: 99%

“…However, the widespread acceptance of the adsorption systems is hindered by its relatively poor performances and large size due to limited properties of adsorbents [3].…”

mentioning

confidence: 99%

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Preparation of composite adsorbent with high performance of heat and mass transfer

Wang

2013

Chin. Sci. Bull.

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To develop a new composite adsorbent with high performance, fir sawdust and CaCl 2 are selected as raw materials. The mass transfer is enhanced by carbonizing and activating the sawdust and heat transfer is enhanced by adding expanded graphite into the adsorbent. The effect of the preparation temperature and the expanded graphite content on the adsorption performance is investigated. The results show that the new adsorbent exhibits a high adsorption performance due to its high porosity, uniform distribution and high content of CaCl 2 and high thermal conductivity. Also, the experimental results indicate that the rate of ammonia adsorption on the adsorbent depends on the expanded graphite content and the carbonization and activation temperature. The adsorbent prepared at 500°C and with the expanded graphite content of 30% has the best performance in terms of the adsorption refrigeration, which adsorbs ammonia as high as 0.37 g g 1 at 10 min. Adsorption refrigeration systems powered by low grade thermal energy such as waste heat or solar energy have drawn considerable attention due to the benefits of simple control, silent operation with no vibrations and lower operation costs [1,2]. However, the widespread acceptance of the adsorption systems is hindered by its relatively poor performances and large size due to limited properties of adsorbents [3]. The adsorption capacity of physical adsorbents can hardly exceed 30wt% [4]. The adsorption capacity of chemical adsorbents (calcium chloride, strontium chloride, barium chloride, etc.) is rather high, however, the problem of swelling and agglomeration always occurs during the adsorption and desorption process, which results in a poor heat and mass transfer and prevents putting the single chemical adsorbents into practice [5]. In order to overcome these disadvantages, several works have been carried out [6][7][8][9][10]. Aristov and his coworkers, Wang and Zhang developed a new composite adsorbent by confining chemical adsorbents (CaCl 2 , BaCl 2 , MgCl 2 , etc.) into the open pores of a porous host matrix (silica gel, alumina, active carbon, etc.) [11][12][13][14][15]. All their studies showed that the composite adsorbent has a higher adsorption capacity and can solve the problem of swelling and agglomeration of chemical adsorbents [16][17][18][19]. However, the content of chemical adsorbents in the composite adsorbent prepared by impregnating a porous host matrix with chemical adsorbents is only 30%-40%, leading to a great reduction of the cycle uptake per unit mass of composite adsorbent. In addition, to improve the thermal conductivity, the consolidation of adsorbents is often needed, which weakens the mass transfer due to some channels of the adsorbents being blocked. That is to say, there is a contrast between enhanced mass transfer and enhanced heat transfer.To overcome the shortage of low content of chemical adsorbents in the composite adsorbents and solve the contrast between enhanced mass transfer and enhanced heat transfer, a new method for the preparation o...

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Section: Performance Testmentioning

confidence: 99%

Section: Performance Testmentioning

confidence: 99%

mentioning

confidence: 99%

“…However, the widespread acceptance of the adsorption systems is hindered by its relatively poor performances and large size due to limited properties of adsorbents [3].…”

mentioning

confidence: 99%

See 2 more Smart Citations

Preparation of composite adsorbent with high performance of heat and mass transfer

Wang

2013

Chin. Sci. Bull.

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“…Various studies have been conducted to produce continuous cooling with multi bed and advance cycle operation in adsorption cooling system technology. The performance of these systems were enhanced by using the advanced operations like internal mass recovery cycle [10,11], heat and mass recovery cycles [12], multistage and cascade cycles [13,14]. In all these multi bed advance cycle systems, a continuous heating source is necessary to produce cooling continuously.…”

Section: Introductionmentioning

confidence: 99%

Simulation Study of Continuous Solar Adsorption Refrigeration System Driven by Compound Parabolic Concentrator

Umair¹,

Akisawa²,

Ueda³

2014

TOREJ

Self Cite

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Solar adsorption refrigeration is promising technology especially in the developing countries and remote areas because the system can be driven by solar energy without involving electricity. Therefore, it is technologically possible and socially feasible in the areas where electricity is not enough but solar energy is rather easy to obtain. The conventional system works intermittently and produces cooling only during night. In this article, a solar adsorption refrigerator is presented that produces cooling continuously using only solar energy. The system consists of two beds with CPC collectors, a condenser and evaporator. The one cycle complete in two days. A simulation model was developed to evaluate the system performance. The objectives of this study were to investigate the dynamic behaviour of the system, and to compare the system behaviour with the conventional system. The results show that system produces continuous cooling. Cooling rate decreased in the middle of the day because of relatively high ambient temperature. The performance of the system increased with high value of heat transfer coefficient between receiver and bed, and decreased by increasing the adsorbent mass. The performance of the continuous system was compared with that of intermittent system. It was found that the evaporator temperature in the intermittent system increased during the day because cooling is not produced during day in that system, while proposed system kept the evaporator at low temperature continuously. This study will facilitate the future researches in solar adsorption continuous refrigeration technology because achieving continuous cooling only with solar energy is very attractive.

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Computational study of a novel continuous solar adsorption chiller: performance prediction and adsorbent selection

Voyiatzis

Stefanakis

Palyvos

et al. 2007

Int. J. Energy Res.

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SUMMARYA novel solar adsorption chiller intended for domestic use is presented. The chiller can be integrated with existing solar systems based on flat plate collectors, and, contrary to commercial chillers, it operates continuously. A detailed analysis of both the simple and the heat-integrated cycle is carried out so as to select the optimal adsorbent and operating conditions. The employed integral thermodynamic model takes into account the inert masses that limit the performance of the chiller, such as the metal frame, the thermofluid, and the non-adsorbed steam, by introducing heat capacity effects. Given the adsorption equilibrium data, the energy balances, the performance, and the useful thermal loads of the system can be calculated at any operating conditions. The results indicate that silica gel Type A is a more efficient adsorbent compared to silica gel Type RD or Type 3A. Furthermore, the total porosity has a slight effect on system performance, while optimal operation can be achieved when the condenser temperature is less than 326 K and the evaporator temperature greater than 280 K.

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Experimental investigation of mass recovery adsorption refrigeration cycle

Cited by 75 publications

References 8 publications

Preparation of composite adsorbent with high performance of heat and mass transfer

Preparation of composite adsorbent with high performance of heat and mass transfer

Simulation Study of Continuous Solar Adsorption Refrigeration System Driven by Compound Parabolic Concentrator

Computational study of a novel continuous solar adsorption chiller: performance prediction and adsorbent selection

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