49 lines
1.9 KiB
Markdown
49 lines
1.9 KiB
Markdown
---
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tags: tech-tip, HVAC, formulas, design
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---
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# Dehumidifier Sizing by Latent Load
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This is a quick article to show how to calculate the size of dehumidifier needed based on the latent load of a building. This is useful if
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you've done a load calculation and know the latent load of the structure.
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## Formulas
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The formula above is used to solve for the pints per hour required to size a dehumidifier.
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| Where | |
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| ----- | ------------ |
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| Ql | Latent load |
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| Ph | Pints / hour |
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We can then convert to pints per day by multiplying the answer by 24 hours, below is the combined formula.
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| Where | |
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| ----- | ----------- |
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| Ql | Latent load |
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| Pd | Pints / day |
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In some cases you may want to size the dehumidifier for less than the full latent load, assuming that the air-conditioner (when sized
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properly) is going to cover the full latent load when at peak design temperatures and that the peak latent period for your area is during
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peak cooling demand.
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## Example
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Let's imagine we have done a load calculation and have a latent load of 4,334 BTU/h. So, plugging that into our above formula.
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Or if we just want to cover the latent capacity at 85% of the full latent load.
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This gives us some guidance that we would need to select a dehumidifier that is rated for 84-99 pints per day, depending on which condition
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we wanted to use.
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I don't feel oversizing a dehumidifier, within reason, is that problematic (or at least it does not come with the same problems as an
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oversized air conditioner), so I would personally go for a 100-120 pint per day model dehumidifier in this application.
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Thanks for reading!
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