Comparison on Thermal Conductivity and Permeability of Granular and Consolidated Activated Carbon for Refrigeration

Jin, Zhequan; Tian, Bo; Wang, Liwei; Wang, Ruzhu

doi:10.1016/s1004-9541(13)60525-x

Cited by 54 publications

(11 citation statements)

References 11 publications

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“…This method has been widely used in the literature to measure both the thermal diffusivity and conductivity of solid materials with a thermal conductivity between 0.005 and 300-500 W⋅m −1 ⋅K −1 [57,58,60]. In the literature [61], thermochemical heat storage pellets mixed with ENG or AC were expected to have a low thermal conductivity in the range of 0.5 to 2.61 W⋅m −1 ⋅K −1 , within the range of the TPS method. The transient plane source thermal conductivity meter (Xian Yima Optoelec™ DZDR-S) we used for the thermal conductivity measurements has an absolute accuracy of ±3% and a repeatability error less than 3%.…”

Section: Hydration and Dehydration Test Resultsmentioning

confidence: 99%

Investigation of Novel Composite Materials for Thermochemical Heat Storage Systems

et al. 2020

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Increasing energy prices make space heating more expensive every year in The Organisation for Economic Co-operation and Development (OECD) member countries. Thermochemical heat storage systems (THSS) can be used to reduce residential energy consumption for space heating and to control humidity. Utilizing compressed thermochemical pellets as heat storage materials is a way to increase volumetric energy storage capacity and to improve the performance of the THSS. In this work, expanded natural graphite (ENG), activated carbon (AC), strontium bromide, and magnesium sulphate were mixed in different mass ratios and compressed under applied pressures in a range of 0.77 to 5.2 kN⋅mm−2 to form composite pellets with a diameter of 12 and 25 mm, respectively, and a thickness from 1.5 to 25 mm. These pellets were characterized using thermogravimetric analysis and differential scanning calorimetry. Cyclic tests of hydration at 20 °C and dehydration at 85 °C were conducted to investigate changes in the surface morphology and the heat and mass transfer characteristics of the composite pellets. The permeability and thermal conductivity of the composite pellets were also measured. It was found that the structural stability of the pellets was enhanced by increasing the compression pressure. Utilizing AC and ENG in the composite mixture enhanced the porosity, thermal conductivity, and the permeability of the pellets.

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Section: Hydration and Dehydration Test Resultsmentioning

confidence: 99%

Investigation of Novel Composite Materials for Thermochemical Heat Storage Systems

et al. 2020

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“…ENG is beforehand expanded by an optimal expanding process, i.e. heating expandable natural graphite in an oven at a temperature of 600 o C for 8 minutes, which could refer to our previous work [37]. Detailed developing processes of composite SrCl2 by using ENG and Ni@C are illustrated in Fig.5.…”

Section: Development Of Composite Srcl2mentioning

confidence: 99%

Exploration of ammonia resorption cycle for power generation by using novel composite sorbent

Jiang

Roskilly

et al. 2018

Applied Energy

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Exploration of ammonia resorption cycle for power generation by using novel composite sorbent.Abstract: Expanded natural graphite and carbon coated nickel are selected as the additives in the development of novel composite sorbent. Improved thermo-physical properties of composite strontium chloride result in a faster sorption reaction rate than that without using carbon coated metal. A case study of ammonia-based resorption power generation cycle with two identical reactors is analyzed in terms of sorption characteristics of composite sorbents. Power could be generated in both half cycles, which greatly enhances working versatility and thermal efficiency. It is indicated that additive of carbon coated nickel has a positive influence on performance of resorption power generation cycles.Energy and exergy efficiency of basic resorption cycle range from 0.072 to 0.116 and from 0.402 to 0.737, respectively. Basis resorption cycle for power generation is also compared with improved resorption cycle by using different composite sorbents. Increment between improved and basic resorption cycle by using the sorbent without carbon coated nickel is larger than that using that with carbon coated nickel. Energy density by using novel composite sorbent is improved by up to 20% based on mass and volume of sorption reactor. Through reheating process, performance of basic resorption cycle is further improved by 3-5 times.

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“…Their results show that the average thermal conductivity of the activated carbon bed is practically not influenced by the grains size (almost constant at 0.36 W m À1 K À1 ) [25,26]. While changing the grain size, there are two opposite effects on the effective thermal conductivity that may lead to no significant change in this characteristic.…”

Section: Consolidated Bedsmentioning

confidence: 99%

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

N’Tsoukpoe

Restuccia

Schmidt

et al. 2014

Energy

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Comparison on Thermal Conductivity and Permeability of Granular and Consolidated Activated Carbon for Refrigeration

Cited by 54 publications

References 11 publications

Investigation of Novel Composite Materials for Thermochemical Heat Storage Systems

Investigation of Novel Composite Materials for Thermochemical Heat Storage Systems

Exploration of ammonia resorption cycle for power generation by using novel composite sorbent

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

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