Vol.9 No.3 2017

Research paper−155−Synthesiology - English edition Vol.9 No.3 pp.155 –166 (Feb. 2017) system have been in existence since the 1990s, but zeolite and silica gel were used as adsorbents. There was a demand for adsorbents that were capable of adsorption/desorption at low temperature of 100 ºC or less.Against such a background, in Japan, the development of adsorbents that can be reused at low temperatures of 40– 80 ºC was conducted from the late 1990s to early 2000s. The development of adsorbents such as AFI- or CHA-type low-temperature reusable zeolite (AQSOA®), mesoporous silica (TMPS), or polymer adsorbents (TAFTIC®) was conducted. Allophane and imogolite were candidates of clay nanomaterials at the time, and their water vapor adsorption isothermal curves are shown in Fig. 2.[1]-[4] As can be seen, 1 Objective of the researchIn the 21st Conference of the Parties (COP21) of the United Nations Framework Convention on Climate Change (UNFCCC) that was held in Paris in December 2015, the Paris Agreement was adopted as the new framework following the Kyoto Protocol. Further energy savings will be necessary for Japan to reduce greenhouse gases to prevent global warming. The energy-saving technology in Japan has seen innovative development since the 1990s when the reduction of greenhouse gases became a serious social issue. The use of waste heat has also advanced, and currently, waste heat of 100 ºC or higher is utilized efciently, but the technology to use low-temperature waste heat of less than 100 ºC is being researched.There are two types of energy-saving systems using low-temperature waste heat: the adsorption heat pump (adsorption refrigerator) that uses heat generation and absorption that occur when water vapor or ammonia is adsorbed/desorbed by the adsorbent, and the desiccant air conditioning system by which energy saving efciency can be increased through effective water vapor removal. Desiccant air conditioning uses desiccant rotors including adsorbents to dehumidify and then lowers the temperature to the target temperature. Figure 1 shows the outline diagram of the desiccant air conditioning system. The dehumidification part is separated into the dehumidication zone and reuse zone. In the dehumidication zone, the air taken in from the outside is dehumidified and then supplied to the room, while in the reuse zone, the room air is warmed with a heater to recover the air by releasing the water vapor adsorbed in the dehumidication zone. The adsorption heat pump and the desiccant air conditioning - Developing adsorbents for energy conservation systems from a kind of clay nanoparticle-Given the need to reduce greenhouse gases, we have developed an inorganic porous material, HASClay, which possesses excellent water vapor adsorptive efciency, and the ability to dehydrate using a low grade heat source. In this paper, we explain how the synthetic process of HASClay was developed from a study of naturally existing clay and nanomaterials, and the requirements for widespread use as an adsorption material for energy conservation.Development of HASClay® as a high-performance adsorption material Keywords : HASClay, energy conservation, desiccant air conditioning, moisture conditioning material, synthesis method[Translation from Synthesiology, Vol.9, No.3, p.154–164 (2016)]Masaya Suzuki1*, Masaki Maeda2 and Keiichi Inukai21. The Research Institute for Geo-Resources and Environment, AIST Tsukuba Central 7, 1-1-1 Higashi, Tsukuba 305-8567, Japan * E-mail: , 2. Structural Materials Research Institute, AIST 2266-98 Anagahora, Shimoshidami, Moriyama-ku, Nagoya 463- 8560, JapanOriginal manuscript received March 28, 2016, Revisions received August 1, 2016, Accepted August 3, 2016Fig. 1 Outline of the desiccant air conditioner that uses water vapor adsorbentWarm airDehumidicationWater vapor in air is adsorbedReuseWarm air from heater desorbs moistureMoist airRoomExternal airDry airDesiccant rotorHeater

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