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  • Users: rmusa
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  1. rmusa

    LEED 2009 EA C1.3

    For Leed EA C1.3 calcs to comply with Core Perf Guide: We need to provide load calcs, zone by zone load calcs at design conditions, Fan sizing calcs, critical path supply duct pressure load calcs and part load condition calcs. 10 story building 6th floor occupied by one tenant Chilled water...
  2. rmusa

    air pressure sensor in apratment bldg laundry

    Laundry room with 6 dryers that exhaust to outside. RTU supplies into room. OA is modulated up as dryers come on. Room pressure sensor is used to control the OA damper. Pressure sensor to maintain 0.05" setpoint (adjustable) in room. Is this the best way to control? Current sensors on the...
  3. rmusa

    counter map and sewer invert elevation

    How to read counter map? See attached image Are A and B invert elevations or rim elevations? Can both be determined by this number? How can we find the elevation of the house? C Is E and F the elevation of street or house? Generally there are 4-5 steps up to first floor of house in front yard...
  4. rmusa

    Dryer Exhaust

    6 dryers, 6"dia vents at 500 cfm, run on gas at 75 mbh each, commercial 30lbs capacity Speedqueen high rise bldg laundry 10 ton dedicated rtu serves the room Currently balanced to 3200 cfm. This unit can only do 800cfm oa (per model number) Dryer vents tied to two headers (set of 3 dryers...
  5. rmusa

    humidity in laundry room

    What is the best way to estimate latent load in room with 6 dryers? 10 washers? apt bldg.
  6. rmusa

    gas heater in elec room

    If a gas unit heater (30 mbh) is installed in elec room, does this need to be explosion proof? The room has transformer, 1200kva panel.
  7. rmusa

    RTU in training room

    Office space and training room with 50 people ~2000sf. Office space load is 3 tons, training room load is 10 tons Existing RTU-1 is 7.5 ton unit only and it will serve office (cannot demo it and have to use the remainder capacity). The remaining 4 ton will serve training room. The training room...
  8. rmusa

    LOADING DOCK

    LOADING DOCK 1100 SF 12FT HIGH WALLS 36X30 TWO 12X10 ROLLUP STEEL DOORS USING ENVELOPE LOADS/ 60DEGF SPACE TEMP 2ACH= 33MBH UNIT HEATER 4ACH= 56MBH UNIT HEATER 30 BTUH/SF OR 50 BTUH/SF, WHICH IS BETTER THE DOORS WILL OPEN DURING DELIVERY AND WILL NEED TO HEAT UP QUICKLY WHEN GONE. TWO...
  9. rmusa

    gas piping

    Attached is gas piping diagram. IFGC 2015 Total load of 1170 CFH, see attached roof plan and riser. Furthest RTU is 200' from the meter. Lengths of the branches on dwg How do we determine which chart to use 402.4---(1) , (2) or (3). If we can reduce the gas pressure to any of these charts then...
  10. rmusa

    Can a furnace and water heater flue

    Can a furnace and water heater flue (92% eff) combine and go out side wall of basement? Final height about 36" above grade (washington, dc) For a 92% eff furnace is concentric vent kit required? Can a regular 5" or 6" vent be used, with combustion air coming from inside the house. What is...
  11. rmusa

    Sprinkler System in A-2 occupancy space

    Building built in 1955. Original use: Office. Converted to Retail space, 1990's Area of modification: 4000 sf Will convert to Banquet hall/assembly, Occupancy type A-2, Not all area will be banquet hall, some corridor,kitchen, toilets. It is less than 5000sf but there will be more than 100...
  12. rmusa

    waste pipe elevation

    Basement is 4ft below street level. The water closet and Tub rims are below the street level, in bathroom in basement. Existing waste pipe has no backflow valve. Per code if the flood level of the lowest fixture is below the manhole on street need a backflow valve. IPC2012, washington, dc. The...
  13. rmusa

    Self contained infrared sauna

    A sauna that uses 3000W of heat (infrared) to be installed in a room Two sides of the room have office/consultation room. Front is corridor. back to retail space. The room is 60 Sf. The Sauna is about 30 sf. Will sauna dissipate heat to the room it is in? Will it dissipate heat to adjacent...
  14. rmusa

    Waste piping - too many elbows close by

    See attached. The waste pipe is 4" from a wall mounted water closet that discharges into wall horizontally (tank valve, discharge about 8" Above floor, centerline). Then it turns down and drain pipes from 2 lavs and shower are connected. The first elbow is right behind the wall. Then the pipe...
  15. rmusa

    distance between shower drain and ptrap

    See attached. The shower is on 2nd story of a high rise condo building (below is an office space). The drain is 2" . We don't want to raise the shower floor. There is beam below. If we stay to the left of the beam then the pipe will be too low, as we only have 8" drop to the bldg sewer in 1st...
  16. rmusa

    kitchen grease duct through a loading dock.

    We have a 4500 cfm grease exhaust duct tied to a hood. The duct will penetrate wall behind kitchen and then go through a two bay loading dock and then to the exterior. The walls around the loading dock are 3 hr rated. The duct will have standard 2 hour rating, double wall manufactured with...
  17. rmusa

    Fitness Center Dehumidification

    Fitness center: 10000 sf total space 7000sf fitness area Two 10 ton RTU, One 5 ton RTU RTU’s oginally designed for a standard Retail space - 10000 CFM supply air total, 2500 CFM OA total 7 ft windows Condensation on glass on very cold days (25 degf or less) No baseboard heat What is most...

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