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Is There A Way To Calculate Recovery From Setback Time?

 
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Old 03-01-2018, 09:52 PM   #21
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Re: Is There A Way To Calculate Recovery From Setback Time?


The floor really isn't responsible for that much loss. This is without slab insulation. Adding insulation halves the loss through the floor, so it would lower the overall heat load by about 1/8th.

The numbers are goofy for heat pumps since they are more than 100% efficient. That's why "heating system loss" is a negative number.
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Old 03-01-2018, 10:08 PM   #22
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Re: Is There A Way To Calculate Recovery From Setback Time?


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Originally Posted by Golden view View Post
The floor really isn't responsible for that much loss. This is without slab insulation. Adding insulation halves the loss through the floor, so it would lower the overall heat load by about 1/8th.

The numbers are goofy for heat pumps since they are more than 100% efficient. That's why "heating system loss" is a negative number.
What program is this? Did you do an actual blower door test or just assume your ACH50?
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Old 03-01-2018, 10:23 PM   #23
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Re: Is There A Way To Calculate Recovery From Setback Time?


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What program is this? Did you do an actual blower door test or just assume your ACH50?
AKwarm. Designed for Alaska, but you can tweak it to work in other environments. I made a huge assumption for my ACH50. I can usually guess a house pretty well, but this is a pole barn. It'll be all foam though so should be pretty tight. Maybe the overhead doors will be really leaky though.
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Old 03-01-2018, 10:48 PM   #24
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Re: Is There A Way To Calculate Recovery From Setback Time?


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Originally Posted by Golden view View Post
AKwarm. Designed for Alaska, but you can tweak it to work in other environments. I made a huge assumption for my ACH50. I can usually guess a house pretty well, but this is a pole barn. It'll be all foam though so should be pretty tight. Maybe the overhead doors will be really leaky though.
Interesting little program. I didn't see an area to change the weather file, seems fixed to alaska. how do you change it for your location?
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Old 03-01-2018, 11:03 PM   #25
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Re: Is There A Way To Calculate Recovery From Setback Time?


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Interesting little program. I didn't see an area to change the weather file, seems fixed to alaska. how do you change it for your location?
Alaska is a big state. I picked a close weather city and set the thermostat setpoint lower to compensate from there.
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Old 03-02-2018, 07:39 AM   #26
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Re: Is There A Way To Calculate Recovery From Setback Time?


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Used Carpet/wood flooring on the shop floor would insulate it lowering the BTU load per hour greatly....just throw it away every year and replace

"Horse barn mats"? much easier to sweep and Vacumn.

Great for standing on, but over $1.5 / sqft even for cheap ones. Plus, they can shift.

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