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Old 08-30-2020, 07:57 AM   #16
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Re: It pays to know your landlord...


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Originally Posted by user_12345a View Post
What about using hydronic coil heat exchangers for free cooling in winter? - air to air, water transfers the heat outside. reduce reliance on refrigeration without bringing in contaminates.

obviously straight air economizers are off the table.

i'm sure this could be done with far less energy but means spending more upfront.

Using hydronics for cooling in the winter would require glycol to be added to prevent pipe freezing and bursting in the winter. Which increases the size of the system required, as glycol lowers heat transfer.


It would also mean 2 different systems, one for summer cooling, and one for winter cooling. Unless the hydronics was incorporating WSHPs. Which of course is still a mechanical cooling system.
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Old 08-30-2020, 10:00 AM   #17
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Re: It pays to know your landlord...


*hydronic coil in existing air handlers, not entirely separate.

i know it can also be done when a chiller is used - when it's cold enough outside have a direct heat exchanger instead of running the chiller.
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Old 08-30-2020, 10:17 AM   #18
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Re: It pays to know your landlord...


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Originally Posted by user_12345a View Post
*hydronic coil in existing air handlers, not entirely separate.

i know it can also be done when a chiller is used - when it's cold enough outside have a direct heat exchanger instead of running the chiller.

Which requires glycol in the system. Which requires the hydro coil in the air handler to be larger.
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Old 09-02-2020, 01:22 PM   #19
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Re: It pays to know your landlord...


Still working on the bid. Will have to go with rectangular duct instead of spiral due to some height constraints with the lighting. Pictures show what you can get for a lot of $$$$ if you are not careful. Sorry for the sideways view.



It pays to know your landlord...-ant3.jpg
It pays to know your landlord...-ant1.jpg
It pays to know your landlord...-ant2.jpg
It pays to know your landlord...-ant4.jpg
It pays to know your landlord...-ant5.jpg
It pays to know your landlord...-ant6.jpg
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Old 09-02-2020, 01:27 PM   #20
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Re: It pays to know your landlord...


More pics. 6 to 8 weeks for unit delivery. Carrier model 48HQ, will mount on 18" curb, route copper condensate line straight into the building then trap it before going into a condensate pump. Condensate line will be heat traced and insulated.



It pays to know your landlord...-ant7.jpg
It pays to know your landlord...-ant8.jpg
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Old 09-02-2020, 05:21 PM   #21
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Re: It pays to know your landlord...


That is some sorry workmenship from them.
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Old 09-02-2020, 05:58 PM   #22
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Re: It pays to know your landlord...


Is the foil taped cardboard supposed to be permanent?
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Old 09-02-2020, 07:26 PM   #23
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Re: It pays to know your landlord...


You know, as bad as the current workmanship is, I'm glad to see the owners in good spirits (grow operation?) and are able to laugh about it and want to do the job right. The cardboard will be removed, the hole size in the side of the building is thankfully too small to handle what's needed so a neat hole can be cut and the duct flashed in. The return will need a bit of work to adapt to the hole in the drywall. The unit will have to be shifted away from the building an additional 3' or so and installed on a curb. Funny, I kind of enjoy jobs like this, they have a little bit of flavor to them.
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