Small & simple question

Can you find a nice reproducibility of the moisture adsorption measurement for WS-AC and AS-AC?

Akira Harata

2021/10/18

Other materials

Thank you for the interesting presentation. I really enjoyed it since it was about something that directly effects our daily life. Is there any other material that can be produced to AC, with the same effects?

Ueda

2021/10/18

Quick questions

Thank you for your presentation. Why you choosing walnut shell and acorn nutshell for AC? How frequent these ACs need to be regenerated if use in a typical humidity of Japan or Indonesia? I think it is uncommon to have dehumidifier in Indonesian houses, why you are using Indonesia as your case study?

Suyantara

2021/10/18

Small & simple question

question from Akira Harata Can you find a nice reproducibility of the moisture adsorption measurement for WS-AC and AS-AC? answer: Yes, since activated carbon is stable in high temperatures and the moisture adsorption on it is through weak physical interaction on the surface of activated carbon, we may be able to use this material in many cycles.

Chairunnisa

2021/10/20

Other materials

question from Ueda Thank you for the interesting presentation. I really enjoyed it since it was about something that directly effects our daily life. Is there any other material that can be produced to AC, with the same effects? respond: Thank you very much for your question and comment. Basically, we can produce activated carbon from any material that has an abundance of carbon content such as biomass, coal, or other waste materials. For the effect, it strongly depends on the surface properties of AC that were produced such as pore shape, pore size, surface area, and pore surface functional groups. I hope it answered your question

Chairunnisa

2021/10/20

Quick questions

question from Suyantara Thank you for your presentation. Why you choosing walnut shell and acorn nutshell for AC? How frequent these ACs need to be regenerated if use in a typical humidity of Japan or Indonesia? I think it is uncommon to have dehumidifier in Indonesian houses, why you are using Indonesia as your case study? respond: Thank you very much for your questions. We choose walnut shell and acorn nutshell because it is abundant in Japan and some countries and has been considered as solid waste. Therefore, we would like to increase their economic value of by converting it into valuable materials. We believe that Indonesia has an abundance of biomass with the same promising future for parent material of AC. So, in the future, we would like to try using many types of biomass, including the one from Indonesia. As for regeneration, we expect to use them for the desiccant wheel, so it can be continuously regenerated during working conditions. We choose Indonesia, as the representative of tropical humid countries. In fact, the drying technology demand in this country is very high but until now, drying techniques just rely on conventional air conditioners or by the sun. Drying by air conditioners can consume a lot of energy, and we can not drive air conditioners using sustainable energy such as solar heat due to the lack of energy supply. Therefore, using our proposed technology, with smaller regeneration energy, hopefully drying technology driven by sustainable energy such as from solar or waste heat can be obtained and easily access in the future. Of course, this is just a preliminary study, we need a deeper study to reach those objectives.

Chairunnisa

2021/10/20

Modification of AC

Dear Ms Chairunnisa. Thank you for the nice poster presentation. I am also doing research on AC but for H2S adsorption. I have a little comment, will you consider treating the AC in order to increase the adsorption capability or the surface affinity to H2O? Because regeneration at 40C also means that some of the adsorbed H2O can escape from the biochar in an especially hot days (some region can have day temperature at 35C or higher). Thank you very much.

Hendrik Setiawan

2021/10/21

Modification of AC

Dear Mas Hendrik Setiawan, Thank you for your question. Of course we did several modifications, but not reported here. We tried to add several active functional groups such as carboxylic acid. However, one thing need to be considered is, we have to control it so the adsorption isotherm shape will not change. The reason we use AC is because the isotherm is S shape. Which means, it can be regenerated using lower temperature or low relative pressure. That is our aim. We would like to make AC that has high water sorption at tropical countries' relative humidity with low regeneration temperature. I hope this explanation can answer your question. For details, you can refer to our recent publication at; https://www.sciencedirect.com/science/article/pii/S2352484721008088 Regards, Nisa

Chairunnisa

2021/10/22