Heat load due to conveyor motors

[MAragorn]

Ok, I feel really dumb about this. It seems like it should be straight forward, but I can't wrap my head around it.

I have a project with about 250 hp of conveyor motors. These conveyors move product both horizontally and vertically. Eventually, one of the conveyors moves the product out of the warehouse at a higher elevation than it comes in.

My question is: Does all the heat from the conveyor motors become part of the A/C load? I understand that if it was a chilled water pump, a fan or an air compressor I would include it all in the A/C load.

But I am getting confused in my head because of the change in potential energy of the product (due to elevation change) leaving the warehouse.

 

[AbbyNormal]

Quark your post was on 'cooling the mechanical room', you have indoor chillers and pumps.

I think the pump motor would be like the 'motor in the space'. Hermetic compressors have their winidngs cooled by refrigerant but the dome can be quite hot and so can some of the discharge piping. I would think treating it as motor in and driven load out would be conservative.

Last hydraulic elevator submittal I had, gave a much higher heat output compared to the "motor in, driven equipment out", however a cooling system sized only for the "motor in" is keeping up. Most likely luck that the elevator is not heavily used.

Take the "V" out of HVAC and you are left with a HAC(k) job.

 

[AbbyNormal]

I think the comment about "high no load currents" is telling you to "CYA"

Take the "V" out of HVAC and you are left with a HAC(k) job.

 

[quark]

My question was about the redundancy of considering full heat load of the prime mover. Like the OP rightly suggested, there should be some power associated with the equipment that is not converted into heat.

I took the mechanical room as an example. If the full motor load is carried out by the room air then you could downsize the cooling tower to just take care of the conditioned space heat load. However, BHP is associated with the increase in refrigerant enthalpy(first) and this is carried away by the cooling water, rather.

The link given by imok2 discusses the OP's issue to some extent. I request you to have a look into that.

Heat output from the elevator may differ during upward and downward movements. My gut feeling is that there should be more heat output during downward transit.

Having said that, as a conservative approach, I will consider ASHRAE's equations. A bit of pep talk and leg pulling adds some heat load to otherwise cold forum.