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calcute earth tube in design builder

asked 2017-12-06 13:39:33 -0600

xion1365 gravatar image

updated 2017-12-06 14:51:01 -0600

How to calculate the four parameters below for earth tube ? Field: Constant Term Flow Coefficient

This number is the “A” parameter in the above earth tube equation. It is part of the user specified modifying parameters that are a function of environmental factors. This parameter, however, is a constant under all conditions and is not modified by any environmental effect. As a result, it is dimensionless. Field: Temperature Term Flow Coefficient

This number is the “B” parameter in the above earth tube equation. It is part of the user specified modifying parameters that are a function of environmental factors. This parameter is modified by the temperature difference between the outdoor and indoor air dry-bulb temperatures. The units for this parameter are inverse Celsius. Field: Velocity Term Flow Coefficient

This number is the “C” parameter in the above earth tube equation. It is part of the user specified modifying parameters that are a function of environmental factors. This parameter is modified by the speed of wind being experienced outside the building. The units for this parameter are s/m. Field: Velocity Squared Term Flow Coefficient

This number is the “D” parameter in the above earth tube equation. It is part of the user specified modifying parameters that are a function of environmental factors. This parameter is modified by square of the speed of wind being experienced outside the building. The units for this parameter are s2/m2. i donw how calcute ? i dont know how

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answered 2017-12-10 13:54:58 -0600

Avi gravatar image

All you need to know is explained very nice in the Engineering Reference from page 1576.

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Asked: 2017-12-06 13:39:33 -0600

Seen: 43 times

Last updated: Dec 10