Hello - I'm a building owner working with an architect to design a heating system for a 2600 square foot commercial space in Detroit. The archiect's heating designer concluded that I need a 10 Ton 224BTU 3 phase RTU for the space. He says this will help with the required conditioned ventilation requirements. This was bad news for me because I prefer hot water heating and I find it massively oversized, leading to lifelong waste of energy and $.
My envelope is: ceilings R40; walls R20; infiltration average; slab on grade floor. The construction is careful. I calculate a heat loss of 75K to 100K btus on design day through on line calculators. I have used this method before in sizing a boiler for a 7K sq/ft building with success.
I would like to use a condensing boiler/radiant floor heat. The architect then told me I would have to spec the boiler for the outside air intake (which apparently by code is necessary - even at night and when empty - this seems off.) But again I'm new to commercial hvac requirements...
Can anyone offer me some advice on how I can move the designer towards the radiant system? Or: could his calcs possibly be right, or is it clear that he's calculating heat loss just by volume?
Any thoughts, appreciated!
My envelope is: ceilings R40; walls R20; infiltration average; slab on grade floor. The construction is careful. I calculate a heat loss of 75K to 100K btus on design day through on line calculators. I have used this method before in sizing a boiler for a 7K sq/ft building with success.
I would like to use a condensing boiler/radiant floor heat. The architect then told me I would have to spec the boiler for the outside air intake (which apparently by code is necessary - even at night and when empty - this seems off.) But again I'm new to commercial hvac requirements...
Can anyone offer me some advice on how I can move the designer towards the radiant system? Or: could his calcs possibly be right, or is it clear that he's calculating heat loss just by volume?
Any thoughts, appreciated!