A review on adsorption heat pump: Problems and solutions

Demir, Hasan; Mobedi, Moghtada; Ülkü, Semra

doi:10.1016/j.rser.2007.06.005

Cited by 328 publications

(217 citation statements)

References 48 publications

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“…After that a solar refrigerator was constructed by Tchernev (1976Tchernev ( , 1980. A review on the reported studies, advantages and disadvantages of adsorption heat pump are given in Demir et al (2008).…”

Section: Introductionmentioning

confidence: 99%

Comparison of Uniform and Non-uniform Pressure Approaches Used to Analyze an Adsorption Process in a Closed Type Adsorbent Bed

2013

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Heat and mass transfer in an annular adsorbent bed filled with silica gel particles is numerically analyzed by uniform and non-uniform pressure approaches. The study is performed for silica gel-water pair, particle radius from 0.025 to 1 mm and two bed radii of 10 and 40 mm. For uniform pressure approach, the energy equation for the bed and the mass transfer equation for the particle are solved. For non-uniform pressure approach, the continuity and Darcy equations due to the motion of water vapor in the bed are added, and four coupled partial differential equations are solved. The changes of the adsorbate concentration, pressure, and temperature in the bed throughout the adsorption process for both approaches are obtained and compared. The obtained results showed that the particle size plays an important role on the validity of uniform pressure approach. Due to the interparticle mass transfer resistance, there is a considerable difference between the results of the uniform pressure and non-uniform pressure approaches for the beds with small size of particles such as r p = 0.025 mm. Keywords Heat and mass transfer · Inter and intraparticle mass transfer resistance · Adsorbent bed List of symbols Variables

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Section: Introductionmentioning

confidence: 99%

Comparison of Uniform and Non-uniform Pressure Approaches Used to Analyze an Adsorption Process in a Closed Type Adsorbent Bed

2013

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“…The properties of adsorbent-adsorbate pair are important for some areas for such as adsorption heat pumps that provide heating and cooling by utilizing thermal energy sources such as solar energy, geothermal energy, peak electricity, and waste heat from industrial processes [1][2][3][4]. The properties of adsorbent-adsorbate pair controls the performance criteria of designed adsorption heat pump.…”

Section: Introductionmentioning

confidence: 99%

Microcalorimetric investigation of water vapor adsorption on silica gel

Demir

Mobedi

Ülkü

2011

J Therm Anal Calorim

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Water vapor adsorption on silica gel was investigated using Tian-Calvet-type microcalorimetry. Differential heat of adsorption data was obtained. The setup of microcalorimetry was used volumetric system to determine adsorption isotherms of water vapor-silica gel. The Langmuir model was used in the interpretation of the adsorption data. The Clausius-Clapeyron diagram was also given. Effective mass diffusivity of water vapor in the silica gel particle as a function of temperature was also determined. The silica gel, which was degassed under vacuum at 10 -7 mbar and 120°C for 18 h, was found to adsorb 0.6, 0.98, 1.1, 1.4, 2, 3.5, 11, 13, and 14 wt% water vapor at 120, 110, 100, 90, 75, 60, 40, 35, and 30°C, respectively. The diffusivities of water vapor inside the silica gel for short-and long-range periods were described using kinetics data as a function of temperature in the Arrhenius form.Keywords Microcalorimetry Á Diffusivity Á Silica gel-water pair Á Heat of adsorption

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“…For this reason, thermal wave length should be shortened by enhancing heat transfer in radial direction inside the bed. Researches have focused on this problem and have performed several experimental studies [1]. In the present study, a finless tube adsorbent bed with an equivalent thermal conductivity of 0.5 W/mK is examined.…”

Section: Resultsmentioning

confidence: 99%

“…Adsorption cooling technology is a sustainable solution to the energy problem as it can use waste or solar energy instead of electricity. Many researches on adsorption cooling cycles are performed [1][2][3][4]. Basic adsorption cooling cycles are intermittent and nonregenerative since they have a single adsorbent bed.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Heat and Mass Transfer in the Adsorbent Bed of a Thermal Wave Adsorption Cooling Cycle

Çağlar

Yamalı

2013

Comput Thermal Scien

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A coupled heat and mass transfer analysis of the adsorbent bed of a thermal wave adsorption cooling cycle is performed. The adsorbent bed is modeled two dimensionally. Governing equations for energy, mass and momentum transfers are solved by Comsol Multiphysics simultaneously. Variations of temperature, pressure, adsorption capacity, equilibrium adsorption capacity and mass transfer coefficient for a finless tube adsorbent bed are presented with multicolored plots. Desorption process is simulated in the model. Results show that the adsorbent bed reaches the maximum cycle temperature uniformly after 5000s. Uniform pressure assumption can be used in the bed due to small pressure gradient during the process. Adsorption capacity decreases from 26.1% to 8.89% in 5000s. Temperature front progresses along the bed creating a thermal wave. The thermal wave length is needed to be short to enhance the bed effectiveness regenerating more heat between the beds of the thermal wave cycle. It can be concluded that a parametric study is recommended for a future work in order to investigate the effects of design and operational parameters on the dependent variables and thermal wave length.

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A review on adsorption heat pump: Problems and solutions

Cited by 328 publications

References 48 publications

Comparison of Uniform and Non-uniform Pressure Approaches Used to Analyze an Adsorption Process in a Closed Type Adsorbent Bed

Comparison of Uniform and Non-uniform Pressure Approaches Used to Analyze an Adsorption Process in a Closed Type Adsorbent Bed

Microcalorimetric investigation of water vapor adsorption on silica gel

Analysis of Heat and Mass Transfer in the Adsorbent Bed of a Thermal Wave Adsorption Cooling Cycle

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