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  1. trashcanman

    How to caculate heat gain for a lift ?

    Why bother? Passengers will not be in the elevator long enough to complain. Remember, that the elevator cab is open to conditioned spaces at each stop.. Just delete the cab AC unit as it is not worth it (unless the client calls for it).
  2. trashcanman

    Flex connector needed for gas connection to suspended make-up air unit?

    Gas flex connections are very common. Why not use them?
  3. trashcanman

    Welding new pipe to corroded pipe

    The Bible says that you should NOT put new wine into old goatskins, else the bag will burst. Great engineering tip from Jesus.
  4. trashcanman

    Asking for Parallel or Series Pump Configuration

    Sorry, but your sketch of the parallel pumps is fundamentally incorrect. If p1=p2 =p3, the flow =0. No pressure difference = no flow, The same goes for the series pumps. To do it properly, will require a system of 5 non-linear equations and 5 linear equations, where flows and pressure points...
  5. trashcanman

    Ducted concealed indoor unit sweating!

    The writer did not say it was a chilled water system. He mentioned an Outdoor Unit, which sounds like a DX split system. Regardless there IS condensation as he stated, not maybe. Did the technicians also check the condition of the cooling coil? If it is clogged with dirt, that would increase...
  6. trashcanman

    Sump Pump Selection

    Replace the old pump and replace with new. The old (how old?) has already probably reached its service life. Now, start with new pump that you can be sure of.
  7. trashcanman

    Repair Garage - Overhead Door Make-up Air

    Forget the door opening idea. Instead use a wall mounted motorized louver or a roof intake unit with a motorized damper. Provide burglar bars also. Also, sound alarm if louver is opened or closed without the fan running.
  8. trashcanman

    Outdoor make-up air duct insulation

    I suggest you get more familiar with Heat Transfer and Psychometrics.
  9. trashcanman

    Hello, I want to perform a flow an

    Please provide a flow diagram, showing all pumps, their elevation, distance from main, and elevation of connection at main. I think I can help.
  10. trashcanman

    Addressing Disparities in Flow Rates for Efficient HVAC System while considering diversity

    Sounds like a good case for primary-secondary pumping system, You flow the chilled water that the chiller(s) require in the primary loop, then on the secondary loop, you flow the diversified flow rate. This should work.
  11. trashcanman

    Redesign for Latent Load

    You must start out with a VALID test and balance report. Most of the T & B reports I saw over about 50 years of design, few were correct. Get a report that makes sense. Then, do your analysis of the system. Off the top of my head, 57 Deg.WB will NOT DO MUCH DEHUMIDIFATION.
  12. trashcanman

    Evaporative cooler for indoor space - air psychrometric

    Evaporative systems work only in dry climates, like Nevada, Saudi Arabia, Iraq, Death Valley, etc. Trying it in SE Asia is a joke. An evaporative system CANNOT, REPEAT CANNOT REDUCE THE AMBIENT AIR RELATIVE HUMIDITY. By definition, it ADDS to the RH. I think you need to hire a competent HVAC...
  13. trashcanman

    This is more of a physics problem,

    This is more of a physics problem, but deals with gas. According to Astro Physics Scientists, a star is made when a huge cloud of H2 starts coming together by gravity. The gas packs in tighter and tighter, creating higher and higher pressure and temperature, till pressure/temperature reaches...
  14. trashcanman

    Estimating how far away a cable rated for 90 C has to be from a stack

    I would treat it the same as a fireplace chimney. Bldg. codes dictate how high about the roof and how far away (horizontally) the muzzle of the stack must be from a flammable surface and add your choice of a safety factor.
  15. trashcanman

    Anyone know of a wall-mounted split system with electric-resistance heating coils in it?

    Check with Trane, Carrier, Daiken. Note that most ductless split systems do not handle much outside air.
  16. trashcanman

    How to Size Thermal System

    I would treat this as a chilled water system and use primary-secondary pumping. Have a pump for each item to be cooled, thermostatically controlled. The whole system should be at least equal to the entire load + a safety factor to account for fouling. That way, If a pump comes on, the other...
  17. trashcanman

    Replacing 3.9k sprinklers

    Just curious, but what is your company's responsibility on this project, inspection, repair, replacement,.... or what?
  18. trashcanman

    Warehouse Sprinkler Main Sizing

    If I were the Sprinkler Contractor, I would be leery of accepting your sizing of the main. The Contractor is usually responsible for the entire piping system, from the tap on the water main to the last fire inspector connection. You see if your main size is too small, the Sprinkler Contractor...
  19. trashcanman

    Finding the temperture of the glass on an incandescent light bulb

    Heat output of the bulb cannot be more than the wattage input to the bulb (if that is what you are after).
  20. trashcanman

    Multi-Family HUD Design Requirements

    You had better inform the client (in writing) of your intention, so he/she/it cannot come back and bite you. Ask for confirmation that they received your letter.

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