Development research on composite adsorbents applied in adsorption heat pump

Silica gel polymer composite desiccants for air conditioning systems

“…The surface area of composite desiccants must be decreased because of the polymer's blocking some silica gel pores. These results are normal in composite desiccants [3,7,16]. The different adsorption principles between silica gel and polymer, similar to a CaCl 2 silica gel composite desiccant, lead to a decrease in the degree of influence of the dehumidification performance by the surface area.…”

“…Molecular sieves are more expensive than other common adsorbents. Activated carbon has a large internal surface area and porosity, so it has a large sorption capacity; however, Huanga et al [3] reported that carbon is more suitable for use in conditions of relative humidity greater than 70% due to its poor hydrophobicity. Chang et al [4] used activated carbon, aluminum, and a mixture of activated carbon and aluminum as energy-storage materials to increases the latent heat and sensible effectiveness of a double flow-circuit heat exchange device.…”

Study on consolidated composite sorbents impregnated with LiCl for thermal energy storage

“…Conventionally, activated carbon is regarded as hydrophobic, especially at low relative pressures in closed adsorption systems. Recently, some researchers [29][30][31] have intended to modify the water sorption characteristic of activated carbon by impregnating hydrophilic water sorbents in the internal pore space. Huang et al [30] obtained hydrophilic activated carbon by immersing silica into the mesopores and macropores of activated carbon but still the improvement on water uptake was not enough.…”

“…Recently, some researchers [29][30][31] have intended to modify the water sorption characteristic of activated carbon by impregnating hydrophilic water sorbents in the internal pore space. Huang et al [30] obtained hydrophilic activated carbon by immersing silica into the mesopores and macropores of activated carbon but still the improvement on water uptake was not enough. Tso and Chao [29,31] developed composite adsorbents by soaking activated carbon in sodium silicate solution firstly and then in CaCl 2 solution.…”

Development of an All-in-One Type Adsorption Heat Pump for Heating Application

“…With the improvement of energy saving and environmental protection requirements, the adsorption heat pump has attracted considerable attention because the heat source is adequate as driving energy, such as industrial waste heat, solar heat and so on. In addition, they do not emit greenhouse gases (Wang and Zhu, 2002, Wang et al, 2005a, Wang et al, 2005b; the researches on the model of adsorption heat pump were carried out, for example by Chahbani et al (2004) and Gui et al (2002), and the researches on the adsorbents has greatly attracted many interests (Huang et al, 2010, Okunev et al, 2008. From the practical application point of view, the major advantage of the adsorption heat pump is that it does not need maintenance for long periods since it does not contain any moving parts or only contains a few simple moving parts (Demir et al, 2008) in advanced systems.…”