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I'm the doing the Hvac design for a 200 square ft. laundry room. It has 6 washers and 6 dryers. The room is to be cooled and heated. The dryers will be exhausting 150-200 cfm each. I plan on sizing the exhaust header so I don't have to use a fan. Would an outside door louver be the best way...

I'm building a home using structural insulated panels. According to all the reports that I read, a home built using sip construction, if built right, is tight and requires outside air for ventilation. According to the North Carolina building code you need .35 ACH. What would be the best way...

I am trying to determine the total load that the cooling coil needs to handle. Below is the information I have. 1. Outside design conditions and quantity. 2. Room design condtions. 3. Room sensible loads. 4. Room latent loads. I have plotted the outside and room design conditions on a psych...

I have the drawings from a manufacturer for a 40' x 40' metal building. Looking at the worst case scenario(115 mph winds), the uplift would be 7 kips. Won't this make the footing have to be oversized greatly to counteract the uplift force? I am thinking about using a buried spread footing and...

EEJaime, On my panel schedule, would the 5328 watts be in the column under all 3 phases or would I divde by 3 and put that number under each phase. I plan on using the phase with the highest watts and using that to calculate the maximum amperage. Lumbee

I am doing a panel shedule for a small commercial building. I am trying to find out the watts of a condensing unit so that I can put it in each of the 3 phases. The unit is 208 Volts/ 3 phase. The minimum branch circuit ampacity according to the manufacturer is 24 amps. The compressor...

I have two existing lighting panels that I am trying to size a generator for. Both are 480V 4 wire. The lights are 277 volts. Panel 1 has (6) 20amp light circuits at 277 volts. Assuming 100% circuit usage and evenly dividing 40 amps across all three phases I calculated 33.25 kva (40 amps x...

I have a 1/4" I.D. steel pipe with air flowing through it for glass chip removal. I need help in determining the velocity so I can calculate air usage.

I am designing a foundation for a metal building that is being built over a partial existing slab. I am able to use hairpins at all columns except two. These two locations are near the existing slab and prevent me from using hairpins. Does anyone have a suggestion on how to handle the 9 kip...

I am designing a spread footing for a lightly loaded metal building. I am using a 24" x 24" x 18" deep footing. The punching shear and beam shear check okay and there is enough reinforcing to help with the bending moment. The baseplate is 12" x 8". I am using 3000psi...

If the column baseplate is below the slab(12"), do you wrap the hairpin around the column and then into the slab? If so, how do you attach the hairpin around the column? If the column baseplate is at floor level, is the hairpin atttached to the anchor bolts directly beneath the baseplate...

I am designing the spread footings for a 40' x 60' metal building. The building manufacturer cautions the foundation engineer not to forget about the horizontal thrust load at the column base. I understand how the vertical forces and moments affect the foundation design but what about the...

I am a new fire protection designer looking for a good all around reference book. I am currently thinking about the Fire Protection Engineering Handbook from NFPA or the Design/Layout of Fire Sprinkler Systems, Second Edition from Mark Bromann. Does anyone have a suggestion?

I'm doing the hvac design for a commercial kitchen. I have used the formulas in the International Mechanical Code to find the required exhaust cfm. I'm trying to decide on how much make up air I need. The code says the make up air should be approximately equal the exhaust air. I know you...

NEW HVAC DESIGNER WITH A LOT OF QUESTIONS Don't manufacturers rate fans according to static pressure instead of total pressure? Also to get the system static pressure don't you calculate the total pressure for the supply and return and subtract the velocity pressure at the fan outlet? What...