Experimental study on heat and mass transfer characteristics for a desiccant-coated fin-tube heat exchanger

Li, Zhang; Saikawa, Masatoshi; Fujinawa, Takeshi

doi:10.1016/j.ijheatmasstransfer.2015.05.095

Cited by 75 publications

(22 citation statements)

References 30 publications

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“…The mass transport rate on the DSC side (Md) is evaluated based on the humidity and mass transfer coefficient 11) in the following expression:…”

Section: Experimental Data Analysismentioning

confidence: 99%

“…This process is allowed the heat of adsorption released from the DSC material, which has a high temperature, towards the airstream. During the contact with DSC material, the process air is dehumidified, and the temperature of the air is nearly constant 11) . In addition, it is also shown in Figs.…”

Section: Humidity Ratio and Relative Humidity Of Ddsmentioning

confidence: 99%

“…For the passive dehumidification, the HMT influences the enthalpy recovery while the active dehumidification HMT has an impact on the regeneration temperature and adsorption capacity of the system. Li et al 11) investigated the HMT characteristics for a DSC-coated fin-tube heat exchanger during the adsorption and desorption process. They have found that the parameters which affect the mass-transfer coefficient are the air flow rate, the temperature and humidity of the DSC felt.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Experimental Study on Dehumidification Technology using Honeycomb Desiccant Block

Yaningsih¹,

Mahmood²,

Wijayanta³

et al. 2018

Evergreen

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The current research highlights the potential of using desiccant dehumidification technology with the merits of low initial energy consumptions. The system consists of desiccant (DSC) block units, dehumidification and regeneration air sources, air flow control valves, and a set of the heat exchanger. Attention was given to the DSC blocks. The blocks were made of hydrophilic polymer with honeycomb shaped. The present study focuses on the heat and mass transfer (HMT) characteristics to enhance the performance of the system. Three different process air temperatures of 20 o C, 25 o C, and 35 o C were investigated under constant regeneration air temperature of 55 o C and inlet air velocity of 0.1 kg/s. For each process air temperature, four different switching time ratios were also introduced to examine the HMT balance of the DSC blocks. The results revealed that the dehumidification capacity of the DSC system has high potential as air conditioning devices. The discrepancy of HMT found was less than 8%. Hence, the experimental methods were reliable to conduct the further experiments.

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“…The mass transport rate on the DSC side (Md) is evaluated based on the humidity and mass transfer coefficient 11) in the following expression:…”

Section: Experimental Data Analysismentioning

confidence: 99%

Section: Humidity Ratio and Relative Humidity Of Ddsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Experimental Study on Dehumidification Technology using Honeycomb Desiccant Block

Yaningsih¹,

Mahmood²,

Wijayanta³

et al. 2018

Evergreen

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show abstract

“…It should be noted that the Equation (13) was derived under the condition of non-internal cooling with inlet air temperature range from 20 • C to 34 • C, relative humidity range from 55% to 68%. Equation (14) was derived under the condition of internal cooling with inlet air temperature range from 20 • C to 34 • C, relative humidity range from 55% to 80% and cold water from 14 • C to 32 • C. Then a set of data that was not used in the fitting process was used to verify the accuracy of the formula respectively. The comparison results were shown in Figure 18.…”

Section: Mass Balancementioning

confidence: 99%

“…It was found that the SCDHE system can improve the dehumidification efficiency by 17% compared to the conventional system. And then, the heat and mass transfer characteristic of a desiccant-coated fin-tube heat exchanger was investigated by Li et al [14]. He also established the mathematic model of which.…”

Section: Introductionmentioning

confidence: 99%

Study on Dehumidification Performance of a Multi-Stage Internal Cooling Solid Desiccant Adsorption Packed Bed

et al. 2018

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In this paper, the solid desiccant adsorption packed bed with a three-stage internal cooling (ICSPB) has been proposed to improve the dehumidification efficiency and make a comparison with that of non-internal cooling. To investigate the performance of the ICSPB, the dehumidification capacity, dehumidification efficiency, water content of solid desiccant, moisture ratio of solid desiccant, temperature of solid desiccant and inlet and outlet air temperature difference were discussed in different conditions of inlet air and supplying water temperature. It was found that the dehumidification performance of the bed with internal cooling could be improved greatly in the low temperature and low humidity conditions, while in the high temperature and humid, the improvement was not obvious. With internal cooling, the dehumidification efficiency and the water content of the solid desiccant could be improved 59.69% and 110.7%, respectively, and the temperature of solid desiccant could be reduced 2.2 °C when the ICSPB operated at the inlet air temperature of 20 °C, inlet humidity of 55%, and water temperature of 14 °C. Moreover, the dehumidification performance at each stage of ICSPB was studied. It was found that, the first stage played the most important role in the dehumidification process. In addition, the calculation models that can be used to predict the moisture ratio and the temperature of solid desiccant were established on the test results.

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Binder‐Free Growth of Aluminum‐Based Metal–Organic Frameworks on Aluminum Substrate for Enhanced Water Adsorption Capacity

Yang

et al. 2021

Adv Funct Materials

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Coating metal-organic frameworks (MOFs) on metal substrates is an important research orientation in the applications of MOFs. However, the existing binder-based coating method needs repetitive operations and unavoidably plugs the pores of MOFs, resulting in a reduction of the adsorption capacity. Herein, a binder-free method is proposed to construct the MOF-on-metal structure. The well-intergrown polycrystalline Al-MOF layer on aluminum substrate is prepared by in situ synthesizing Al-based MOFs (MIL-96 and MIL-100) with aluminum ions from the dissolution of aluminum substrates. The morphology and chemical compositions of the MOF coating layer are systematically characterized, and a pH-controlled strategy is proposed to regulate the relative proportion of the hybrid MOFs. Importantly, the MOF-onmetal structure displays ultrahigh water adsorption capacity of 192.5 g m −2 , which is the highest of all reported desiccant-coated metal structures, and superior cycling stability. Further, the performance of a desiccant heat pump system utilizing MOF-on-metal structure is predicted, demonstrating that the operation period is 80% longer than a system with a binder-based silica gel coating, and the average dehumidification capacity can reach 8.36 g kg −1 dry air. In conclusion, the new method enables the formation of binder-free, low-cost, and high-performance MOF coating and has a broad prospect in energy-efficient adsorption-based applications.

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Experimental study on heat and mass transfer characteristics for a desiccant-coated fin-tube heat exchanger

Cited by 75 publications

References 30 publications

Experimental Study on Dehumidification Technology using Honeycomb Desiccant Block

Experimental Study on Dehumidification Technology using Honeycomb Desiccant Block

Study on Dehumidification Performance of a Multi-Stage Internal Cooling Solid Desiccant Adsorption Packed Bed

Binder‐Free Growth of Aluminum‐Based Metal–Organic Frameworks on Aluminum Substrate for Enhanced Water Adsorption Capacity

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