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<p>Type 39 is written to be as generic as possible - not just a vertical cylinder geometry. What if your tank is rectangular? Should there be an entirely new model for that geometry? We thought not so we wrote the model to be as flexible as possible. Yes - for some configurations, like the cylinder, you can get cross sectional area from circumference. But for most others you can't. Type 39 assumes a flat bottom tank with a uniform cross section with height. If that doesn't fit your needs you can always modify the source code to create a new model that matches your geometry - that's the true power of TRNSYS.</p>
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<p>Jeff </p>
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<pre>---<br />Jeff Thornton
President - TESS LLC
3 N. Pinckney Street, Suite 202, Madison WI USA 53703
Office: (608) 274-2577 Fax: (608) 278-1475
www.tess-inc.com
E-Mail: thornton@tess-inc.com
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<p>On 05/16/2020 8:59 pm, Adrian Riebel Brummer via TRNSYS-users wrote:</p>
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<div>Dear TRNSYS users,</div>
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<div>I have some problems understanding the parameters that I have to provide for Type 39 - Variable Volume Tank.</div>
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<div>I must provide a Cross-sectional Area AND a Tank Circumference. Isn't that a little bit redundant? I mean, if we assume that the tank is cylindrical (and I also don't know if it's vertical or horizontal) then we can know the circumference by knowing the area.</div>
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<div>Maybe I am not understanding the shape of the tank. I also think it's weird to provide a "circumference", I would think it's more logical to provide a radius instead.</div>
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<div>I would be very grateful if you can tell me what does each of these parameters mean (circumference and cross sectional area) and what is the actual configuration of the tank (vertical, horizontal, what is the shape, etc).</div>
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<div>Thanks!</div>
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<div>Regards,</div>
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<div>Adrian Riebel</div>
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