Investigation of Ethanol/metal organic frameworks for low temperature adsorption cooling applications

Insights of water vapor sorption onto polymer based sorbents

“…The adsorption based systems ensures zero ODP and GWP, and can be operated on thermal heat source which gives opportunity to utilize low grade waste heat or solar thermal energy. Many adsorbent/refrigerant pairs have been experienced to establish an efficient and economic adsorption heat pump system which includes: (i) activated carbons with ethanol , methanol (ElSharkawy et al 2009), ammonia (Tamainot-Telto and Critoph 1997), HCF410A (Askalany et al 2014), HFO1234ze(E) (Jribi et al 2013), R134a (Saha et al 2012) and n-butane (Saha et al 2008); (ii) activated carbon fiber with ethanol (Saha et al 2007); (iii) metal organic frameworks (MOFs) with water (Rezk et al 2012), and ethanol (Rezk 2013); (iv) silica-gel with water (Saha et al 1997), and ammonia (Sward 1999); (v) zeolite with CO 2 (Sward 1999), and water (Demir 2013); and many more. Polymers are widely used in industries such as lubricant, rubber, membrane, hydrophobic adsorbent and medicine (Gun'ko et al 2014), and therefore adsorption characteristics of polymers have been studied widely.…”

Ethanol adsorption onto carbonaceous and composite adsorbents for adsorptive cooling system

“…Some adsorption machines based on zeolites e methanol, activated carbons e methanol, activated carbons e ammonia, zeolites e water working pairs were realized in actual practice and operated with real COP varying from 0.12 to 0.33 [42,10]. The modeling of a commercially available two-bed silica gel/water adsorption chiller with "MIL-101Cr e ethanol" working pair demonstrated that COP of 0.18 can be achieved in the refrigeration cycle [16]. Thus, the values of the maximum COP estimated here for SRD 1352/3 and SG/LiBr demonstrate their high potential for practical application in adsorption chillers, in particular for refrigeration cycles.…”

“…Under conditions of ice making cycle, means at evaporation temperature À3 C the ethanol uptake on KOH4-PR and KOH6-PR is much lower 0.3e0.4 g/g. Recently, Rezk et al and [16] Saha et al [17] have been presented the experimental and theoretical investigations of adsorption characteristics of ethanol onto metal organic framework namely MIL-101Cr. The adsorption capacity of MIL-101Cr reaches as high as 1.1 g/g at ethanol relative pressure of 1, while under conditions of the typical air conditioning cycle (evaporation and adsorption temperatures of 10 and 30 C, respectively) it is 0.9 g/g.…”

Performance of MIL-101(Cr)/Water Working Pair Adsorption Refrigeration System Based on a New Type of Adsorbent Filling Method

“…The adsorption effect of MIL-101 (Cr) on different adsorbates is also different. MIL-101 (Cr) has the largest adsorption capacity for ethanol (1.2 g·g −1 ), and the MIL-101 (Cr)/ethanol working pair has a remarkable stability [11]. Modification of MIL-101 (Cr) or compounding with different materials will improve the water vapor adsorption capacity of the original MIL-101 (Cr) [12][13][14].…”