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GPS-X Technical Reference

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213 Suspended Growth Models<br />

Table 6-8 – Parameters for the Temperature Model<br />

Parameter Description Unit Value<br />

U i Heat coefficient W/m 2 /C<br />

Subsurface aeration, Ui = 25<br />

Surface aeration, Ui =<br />

11.4.P aer/V<br />

A Surface area of reactor m 2 Variable<br />

V Volume of the reactor m 3 Variable<br />

T a Air temperature C Variable<br />

T wo Water temperature in reactor C Variable<br />

U la<br />

Heat transfer coefficient for liquid/air<br />

wall<br />

W/m 2 /C 1.0 (default)<br />

A la Liquid-air contact wall area m 2 Variable<br />

U ls<br />

Heat transfer coefficient for liquid/air<br />

wall<br />

W/m 2 /C 1.0 (default)<br />

T s Soil temperature C Variable<br />

A ls Liquid-soil contact wall area m 2 Variable<br />

P aer Total aerator power W Variable<br />

Unit heat production during aerobic J/g O 2<br />

13985.0 (default)<br />

H uaer<br />

H udn<br />

H uaut<br />

r ou<br />

r dn<br />

r aut<br />

reaction<br />

Unit heat production during<br />

denitrification<br />

Unit heat production during nitrification<br />

Oxygen uptake rate<br />

denitrification rate<br />

Ammonia oxidation rate<br />

consumed<br />

J/g NO 3-N<br />

consumed<br />

J/g NH 4-N<br />

consumed<br />

g O 2<br />

consumed/s<br />

g NO 3-N<br />

consumed/s<br />

g NH 3-N<br />

oxidized/s<br />

32000.0 (default)<br />

25000.0 (default)<br />

Estimated by model<br />

Estimated by model<br />

Estimated by model<br />

All the heat transfer terms are estimated, and the heat balance equation is solved is solved<br />

both for steady state and dynamic conditions. An iterative Newton-Raphson method is<br />

used to solve for temperature at steady state.<br />

<strong>GPS</strong>-X <strong>Technical</strong> <strong>Reference</strong>

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