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Old 09-03-2019, 07:42 PM   #1
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Heat Pump duct work in open shop?


Hello,
Here in West Virginia I own a 40ft x 80ft insulated Pole barn shop. Metal walls and ceiling. Looking at purchasing a used Trane 5 ton packaged unit. It will set outside my shop, with ducts going through the wall. My shop has 14ft ceiling. Thinking I would just mount a square duct down one wall, with vents here and there. Not sure about the return air location. Open to ideals. Also have a lean shed on the north side of my shop, would I be better off with the unit under the lean shed, or out in the open?(No Roof).
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Old 09-03-2019, 07:45 PM   #2
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Re: Heat Pump duct work in open shop?


the unit has to be open, roofs over them cause recirculation.

i urge you to do a load calculation and not just slap a 5 ton unit in there.

search manual j.
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I am not in the business of any trade or topic I give advice on. I have previous diy experience plus good knowledge of theory. Attempt repairs at your own risk. Never jump out safeties - especially pressure switches - on a furnace for testing with fuel supply on; use a meter. Do not troubleshoot with live line voltage present unless there's no alternative.
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Old 09-06-2019, 07:35 PM   #3
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Re: Heat Pump duct work in open shop?


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Originally Posted by user_12345a View Post
the unit has to be open, roofs over them cause recirculation.

i urge you to do a load calculation and not just slap a 5 ton unit in there.

search manual j.
Took your advice. Cooling minimum 11417 btu's
Cooling Max 13128 btu's
Emergency Minimum 29454 btu's
Emergency Max 54257 btu's
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Old 09-06-2019, 07:39 PM   #4
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Re: Heat Pump duct work in open shop?


emergency min/max?

The cooling numbers don't make sense - 3200 sq ft and it only needs around a ton?

Does it have any windows?

What's the indented use? If it will be unoccupied and you'll only cool it down on occasion, you'll need more capacity than what the load calc calls for.

Don't get me wrong, it's still important to have.
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Old 09-06-2019, 08:08 PM   #5
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Re: Heat Pump duct work in open shop?


No windows, except 2ft x 12ft on one end, and 2ft x 24ft on the other end. Metal side walls and ceiling over 13R roll bat insulation., Insulated 12ft garage doors are 15R insulated, one door on the west end, two doors on the east end Don't plan on cooling the shop. Just heating it. I do a little cnc plasma cutting, Metal lathe and Mill. I am a full time Millwright. In my shop every evening and on week ends. Like to keep the shop around 40 degree, until I am in the shop, then around 70 degrees.
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Old 09-06-2019, 08:13 PM   #6
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Re: Heat Pump duct work in open shop?


What was the result for heating?

What climate are you in?

The calculator should probably be set to loose construction due to having garage doors.

Heatpumps aren't great at raising the temp up in cold climates, they're maintainers. Usually installed with electric supplemental heat in areas with real winters.

The btu rating is only applicable at 47f outdoor, 70 indoor. You have to look at the extended performance data to know btu output at design conditions.

There are heatpumps that can maintain full capacity down to below 0f, but could be very pricey - especially a central version.
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Last edited by user_12345a; 09-06-2019 at 08:16 PM.
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Old 09-06-2019, 10:09 PM   #7
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Re: Heat Pump duct work in open shop?


Insulated pole barn with dirty fabrication work going on inside with no existing ductwork and plans to only heat the space?
That screams small unit heaters or infrared heat.
With infrared heat, you could hand several around the shop and only heat the space you were in.
Or radiant tube heaters. Those work kind of the same. They just heat a larger area at a time.
Only drawback is all would need a gas supply.
The conditions in which you describe would not lead to a heat pump lasting very long.
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Old 09-07-2019, 10:06 PM   #8
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Re: Heat Pump duct work in open shop?


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Originally Posted by roughneck View Post
Insulated pole barn with dirty fabrication work going on inside with no existing ductwork and plans to only heat the space?
That screams small unit heaters or infrared heat.
With infrared heat, you could hand several around the shop and only heat the space you were in.
Or radiant tube heaters. Those work kind of the same. They just heat a larger area at a time.
Only drawback is all would need a gas supply.
The conditions in which you describe would not lead to a heat pump lasting very long.
Lol, Dirty Fabrication shop, NO. I keep a very clean shop. Not interested in gas heaters.
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Old 09-07-2019, 10:11 PM   #9
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Re: Heat Pump duct work in open shop?


As others suggested I would go with a tube heater.

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Old 09-07-2019, 10:31 PM   #10
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Re: Heat Pump duct work in open shop?


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Originally Posted by Buckmaster1967 View Post
Lol, Dirty Fabrication shop, NO. I keep a very clean shop. Not interested in gas heaters.
Even “clean” shops will have dust and debris in the air that can affect a normal packaged unit.
If your set on a heat pump, you’d be best to leave it set to your desired temperature constantly.
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Old 09-08-2019, 04:59 PM   #11
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Re: Heat Pump duct work in open shop?


You'll have to filter the air really well -> 4 or 5" thick merv 12s.
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Old 09-10-2019, 08:00 PM   #12
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Re: Heat Pump duct work in open shop?


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As others suggested I would go with a tube heater.

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I would also if I has gas available.
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Old 09-10-2019, 09:25 PM   #13
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Re: Heat Pump duct work in open shop?


Mitsubishi hyper heat ductless

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Old 09-11-2019, 04:31 AM   #14
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Re: Heat Pump duct work in open shop?


Out in the open.


So do you plan on having the overhead doors open in the evening when your in the shop working? Other wise that shop will be extremely warm/hot while your in it.


How much aux heat foes this unit have?
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Old 09-11-2019, 07:02 AM   #15
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Re: Heat Pump duct work in open shop?


Quote:
Originally Posted by user_12345a View Post
You'll have to filter the air really well -> 4 or 5" thick merv 12s.
Our industrial units will usually only have merv 5 or so. (just media Throw aways or frames) They can last up to 6 months, but most aren't used for heating here. So I'd say they would last maybe 3 months for the OP.

Every few years he'll have to clean the coils with a garden hose. Dust from milling work doesn't really stick to the coils much, if it makes it through the filter.

Cheers!
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