The use of metal piece additives to enhance heat transfer rate through an unconsolidated adsorbent bed

Demir, Hasan; Mobedi, Moghtada; Ülkü, Semra

doi:10.1016/j.ijrefrig.2009.12.032

Cited by 64 publications

(25 citation statements)

References 9 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…High specific power because of better heat conduction and permeability [14] Additional costs that could reach ten times the conventional material cost [14] Various effect on the performance [14,29] Increase of the dead mass in the reactor if the additive is not an active adsorbent [14] …”

Section: Tablementioning

confidence: 99%

The size of sorbents in low pressure sorption or thermochemical energy storage processes

N’Tsoukpoe

Restuccia

Schmidt

et al. 2014

Energy

View full text Add to dashboard Cite

Section: Tablementioning

confidence: 99%

The size of sorbents in low pressure sorption or thermochemical energy storage processes

N’Tsoukpoe

Restuccia

Schmidt

et al. 2014

Energy

View full text Add to dashboard Cite

“…To enhance the thermal conductivity of the bed, the size of the adsorbent particles can also be reduced, which will increase the contact area between granules. Moreover, the use of fin or metal additives can accelerate heat transfer throughout the adsorbent bed (Demir et al, 2010). Alternatively, an increase in T a or a decrease in T c (i.e., a narrower cycle) will reduce the duration of the cycle, which may improve the cooling power.…”

Section: Heat and Mass Transfer In Adsorbent Bedmentioning

confidence: 99%

Heat and Mass Transfer in the Adsorbent Bed of an Adsorption Heat Pump

Demir

Mobedi

Ülkü

2011

Chemical Engineering Communications

Self Cite

View full text Add to dashboard Cite

The heat and mass transfer equations governing an adsorbent bed in an adsorption heat pump and the mass balance equation for the adsorbent particles in the adsorbent bed were solved numerically to simulate the cycle of a basic adsorption heat pump, which includes isobaric adsorption, isosteric heating, isobaric desorption, and isosteric cooling processes. The finite difference method was used to solve the set of governing equations, which are highly nonlinear and coupled. The pressures of the evaporator and condenser were 2 and 20 kPa, respectively, and the regeneration temperature of the bed was 403 K. Changes in the temperature, adsorptive pressure, and adsorbate concentration in the adsorbent bed at different steps of the cycle were determined. The basic simulated cycle is presented in a ClausiusClapeyron diagram, which illustrates the changes in average pressure and temperature of the adsorbent bed throughout the cycle. The results of the simulation indicated that the most time-consuming processes in the adsorption heat pump cycle were isobaric adsorption and isobaric desorption. The high thermal resistance of the bed slows down heat transfer, prolonging adsorption and desorption processes.

show abstract

“…In the refrigerant performance, in order to improve the heat transfer performance of the adsorbent and overcome the problem of expansion and caking in the process of adsorption cycle, scholars developed all kinds of high thermal conductivity of adsorbent [4][5][6][7]. In the improvement of the structure of the adsorbent bed, there are ways to increase the heat transfer fins, to promote heat exchange with heat pipes and to prepare heat exchange coatings [8,9].…”

Section: Introductionmentioning

confidence: 99%

Design of solar adsorption refrigeration system with CPC and study on the heat and mass transfer performance

Wang

et al. 2017

IOP Conf. Ser.: Earth Environ. Sci.

View full text Add to dashboard Cite

Abstract.To overcome the problem that the heat source temperature is limited and the lower part of the adsorption tube cannot effectively absorb the solar radiation when solar radiation as the heat source of the adsorption refrigeration system. From the perspective of enhancing the adsorption refrigeration unit tube to absorb solar radiation, thereby strengthening the heat transfer characteristic of adsorption bed, which can improve the efficiency of the refrigeration unit refrigerating capacity and system refrigeration efficiency. Solar adsorption refrigeration system based on CPC was designed and constructed in this paper. The heat and mass transfer performance of the adsorption refrigeration system were studied. The experimental results show that the temperature of the adsorption bed with parabolic concentrating structure can rise to 100℃ under low irradiation condition. When the irradiation intensity is 600 w/m 2 and 400 w/m 2 , the average temperature rising to desorption temperature reaches 0.67℃/min and 0.50℃/min, respectively. It can effectively solve the problem that the conventional adsorption bed is difficult to reach the required desorption temperature due to the low power density of the sunlight. In the experiment, the system COP were 0.166 and 0.143 when the system in the irradiance of 600 w/m 2 and 400 w/m 2 .

show abstract

The use of metal piece additives to enhance heat transfer rate through an unconsolidated adsorbent bed

Cited by 64 publications

References 9 publications

The size of sorbents in low pressure sorption or thermochemical energy storage processes

The size of sorbents in low pressure sorption or thermochemical energy storage processes

Heat and Mass Transfer in the Adsorbent Bed of an Adsorption Heat Pump

Design of solar adsorption refrigeration system with CPC and study on the heat and mass transfer performance

Contact Info

Product

Resources

About