Hello, I am looking for the outdoor air rate required for a brewery project, ASHRAE 62 refers to ACGIH, ACGIH says the outdoor air rate must be as ASHRAE, any supported advise and thanks in advance
Hello,
A house heating load as following (the numbers are only as example):
- Winter outside/inside temperature design : 0F/70F
- Supply air temperature: 120F
- space load (envelop + infiltration): 60000 Btu/hr
- OA ventilation requirement 100 cfm, (7560 Btu/hr)
the question is about air flow...
for a regular house HVAC system (Furnace and AC unit), is the external static pressure the same in both heating and cooling modes? in my understanding the answer is No.
I mean can we say the furnace fan is 1600 cfm @ 0.5" for heating and 1600 cfm @0.5" for cooling.
In typical office space with suspended ceiling tiles, do we consider the 2 feet return air plenum as a part of the zone in regard to the zone cfm calculation?
what would happen if we considered it or we do not.?
How do we consider the VAV box minimum position.?
I am reading ASHRAE 62, 2007, multiple zone calculation and trying to apply on an example from my imagination.
three zones, A, B , and C, served by three VAV boxes.
let us say all efficiencies mentioned in the standard equal to 1,
Supply air...
A commercial space (small store for example) with 8 tones cooling load, if we serve it with 8 tone rooftop unit then we need an economizer as per ASHRAE 90.1,
do we still need economizer if we serve it with two 4 tones rooftop units, each one has its own discharge duct system?
the question is...
Hello,
1- a 1000sq.ft of office space with 4 occupants needs [(5*4)+(1000*0.06)]= 80 cfm of outdoor air.
2- a 2000sq.ft of office space with 4 occupants needs [(5*4)+(2000*0.06)]= 140 cfm of outdoor air.
both spaces have the same height, same everything except the area.
I think the air in the...
ASHRAE 62-2001, table 2 says 20 cfm/person in conference room, while table 6.1 says 6 cfm/person and both are for the same occupancy (50 persne/1000 sq.feet)
which one we have to use?
Three commerical kitchen equipments A, B, and C are under a hood, all of them have the same dimensions, say: 3'x 24"
so our hood would be 10'x36"x24".
equipment A needs 300 cfm/ft
equipment B needs 200 cfm/ft
equipment C needs 100 cfm/ft
1) what the total hood exhaust would be?
is it 10'x300 =...
A standard 2 ton RTU with air side economizer serves internal zone which needs cooling all year.
During the winter, the unit is on cooling mode, ambient is about 0 F,
will the economizer cycle on and open 100% fresh air in this conditions?.
if yes what about the supply air temperature?
Hello all
Two zones A&B have the same occupancy, let say 10 persons each, the load calculation told us that zone A needs 600 cfm, Zone B needs 400 cfm fore example, and both of them need 150 cfm of fresh air each for ventilation.
Now total cfm is 1000 cfm, fresh air is 300 cfm which means 30%...
Hello all
I have general question
can we estimat the capacity of a fin tube provided by hot water from a water heater(not from a heating boiler)the tube length is about 8 feet
Regards
Hello All
I have 7 gas dryers in laundry room in small apartment building.
- is ther any special recomendations to connect thier lent vent to a common exhaust duct
- is ther any special recomoendation for this laundry room.
Thank you all
Hello all
I have questions:
1- is it a good idea to use a perforated spiral duct into an ofice space
2- any rul of thumb to select a water pump for a boiler
Thanks
Hello All
how can we pressurize a space with typical HVAC system
(a unit, supply duct, return duct,and HRV unit).?
I mean if we have 1000 cfm of supply air that mean there will be 1000 cfm entering the unit fan in order to get a 1000 cfm from this fan.
Hello all
I have a question:
I am traying to select an AHU ( hot water for heating, DX for cooling) for an application.
For the cooling side th unit is ok
but, for the heating side the capacity of the coil with the nominal water flow mentioned in the catalog is much higher than my requirment...
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What would happen if we placed a side wall supply air register (or grill) above a window and blow the air toward inside the space instead of flashing the window by supply air?
Thank you
Hello all
When we select equipment, always the available value dose not match the load calculations,
sensible load could be in range, but latent load is not, or visa-versa.
the sensible load would be ok in range of up to 5 or 6% less than calculated, but waht about the recomended range of the...
