My qurey is regarding storage tank heat loss calculation. I have prepared excel sheet for the calculation using the article published by Jimmy D Kumana and Samir P Kothari i.e. Predict storage-tank heat transfer precisely. I do have this article in pdf format but not attached as not sure if I would breach any copyright policy, however it would make easy to understand and compare my calculation with the article if I do so. I would like to attach with the permission of Art/moderator. Problem description and query are as below.
Six Storage tanks [rectangle in shape] are filled up with Isopropanaol (liquid 1) at the initial temperature of 45 deg C and it is required to maintain the liquid temperature at 30 deg C. All the tanks are placed adjacent to each other with minor gap in between. Tanks are stored in a closed building maintained at room temperature let's say 10 deg C and a wind speed of around 2miles/hr.How long will it take to drop down temperature from 45 to 30 deg C with/without insulation OR after what time tanks are required to heat up with/without insulation ? Data is given in the attached excel sheet.
I have considered Isopropanol as a liquid in the storage tank. My calculation gives around 38hrs to drop down temp from 45 to 30 deg C without insulation and around 102 hrs with 25 mm glass wool insulation [you can select the insulation thickness in the calculation]. I don't have the actual data which can guide me how much it should tanke. However, me and my seniors think it should not take such long time for temperature drop down.
Has someone come across similar problem or done the calculation using this article?. I am not here to challenge the article but feel there may be some mistake in my part. I would be happy is somebody validate this calculation.
Note: I have used the first iteration while the article has used number of iterations for more accuracy.
Thanks in advance.
[alert]To get the final version of the spreadsheet, visit our Hall of Fame Downloads. Do not use the attachments in this thread. The Download section contains the finalized version of the spreadsheet.[/alert]
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