Skip to main content

Month: November 2018

The First Commercial Wind Power Generation is Build in Indonesia

Rifka Aisyah Leave a comment

Last week I read performance report of Indonesia Ministry of Energy and Mineral Resources. Indonesia has succeeded in developing the first commercial wind farm in Indonesia. The wind farm was constructed in Sidrap, South Sulawesi. The capacity is 75 MW, consisted of 30 turbines with capacity of 2.5 MW each. The wind farm can supply electricity to 150.000 houses (450 VA per house) [1].

Sidrap wind farm was sponsored by UPC Solar and Wind Investment LLC, a Delaware limited liability company [2]. The wind farm is operated by PT Sidrap Bayu Energi. The electricity is sold to PT Perusahaan Listrik Negara (PLN) to a 30-year power purchase agreement [2]. Read More

Natural Gas Dehydration using Desiccant and Sizing (Bonus Free Spreadsheet)

Rifka Aisyah Leave a comment

In this post, I want to share you about natural gas dehydration using desiccant using adsorption principle and how to size it.

In common commercial use, desiccant can be classified into three categories, which are gels (alumina or silica gels), alumina, and molecular sieves.

When used for natural gas dehydration, silica gel will give outlet dewpoints of approximately -70o to -80oF. As for alumina, outlet dewpoint is appoximately -100oF. Molecular sieves produced the lowest water dewpoints, as low as -150oF. For gas going into cryogenic processing, the only adsorbent that can obtain the required dehydration is a molecular sieve.

Table below shows characteristics of several type of desiccants [1]. Read More

Coal Bed Methane for the Future of Gas Reserves in Indonesia

Rifka Aisyah Leave a comment

Coal bed methane for the future of gas reserves in Indonesia is one topic explained in BUMI Bulletin published by SKK Migas (Indonesia Special Task Force for Oil and Gas). This topic is very interesting because I never considered coal bed methane (CBM) as source of gas until now. CBM is hydrocarbon formed and kept in source rock, it does not move or migrate. In Indonesia, CBM reservoir is very wide and its resource and reserve is large.

Read More

My First Webinar: Sustained Heat Transfer Fluid Performance

Rifka Aisyah Leave a comment

Last time, I had an opportunity to participate in a free webinar held by Chemical Engineering Online. Topic of the webinar was how to sustained heat transfer performance.

I was eager to participate in this webinar because of three reasons. First, the webinar was practical. Second, speaker of webinar was from Therminol, which is one of heat transfer fluid. Third, I indirectly was heat transfer fluid user for two projects. So that, I need to understand about this topic if there is application opportunity in the future.

The first project I used heat transfer fluid was in Rosin Plant and Its Derivatives in Pemalang. The heat transfer fluid was used as heating medium in reactors. The second project was in Senoro Gas Development Project in Central Sulawesi. There are acid gas removal, dehydration unit, and stabilizer that need heat transfer fluid as heating medium. Read More

Renewable Energy Resources: Wave, Tidal, and Ocean Thermal Energy Conversion

Rifka Aisyah Leave a comment

The other type of renewable energy resources that come from ocean are wave energy, tidal energy, and ocean thermal energy conversion.

Wave Energy

Wave energy is a type energy obtained directly from surface wave or surface wave under pressure. The waves are generated from winds blowing from the surface of sea or ocean. Wind itself is a function of temperature and pressure differences across the globe caused by distribution of solar energy.

Wave energy carries kinetic energy and gravitational potential energy. The energy is a function of height and period of waves. Wave Energy Converter (WEC) is used to convert wave energy into electricity. Read More

Where will my blog go?

Rifka Aisyah Leave a comment

I feel guilty to myself because I have broken my commitment: write and update this blog at least twice a week. So here I am, updating this blog. However, this post will be about where will my blog go.

I have listed several topics related to chemical engineering and general engineering. The topics was selected from google keywords and there are some topics that related with my previous works. I really wanted to make the post about those topics, but again I am afraid if my post would not be interesting.

I have checked how people came to my website and what they are looking for. Read More