Hi,
How do I calculate the pressure loss of a converging bullhead tee in a return duct system. The tee has dimensions 23"x23" for the main duct and the branch. Thank you!
Hi,
I would like to calculate the return air pressure drop through a plenum between the first and second floor of a building. The building 1st and 2nd floors shear common plenum return. Do I have to take into account the pressure drop of every single return grill on the ceiling of the first...
Hi,
I am designing a HVAC system for an equipment room that houses a large electrical apparatus. The load in the room can vary from 10,000Btu/h to 85000Btu/h. The room area is 1345ft^2. Should I use CAV or VAV box?
Hi Everyone,
I have to condition a space which would be classified as non-occupant area. WSHP will be used for cooling and heating of that area. Do I have to provide an outside air for a space that will not be occupied at all? Equipment in the space requires conditioning of the area. Thank you!
Hi,
Can someone help me with the following questions?
1.Is the minimum system pressure equal to the system static head (elevation)?
2.Does the system expansion tank precharge pressure have to equal the system minimum pressure?
3.Is it better and more conservative if the expansion tank...
I am designing a shell-end-tube heat exchanger. My shell is a rectangular water tank and my tubes are 1.5in stainless steel pipes. In my design I will not use baffles. The only problem I am facing is calculating the shell-side heat transfer coefficient h(o) (the heat transfer coefficient outside...
I need to determine a resistance coefficient for pipe fittings. The data I found in the web shows different values for resistance coefficient (K). What is the best source providing the most accurate data? Sending a link would be very helpful. Also, do PVC fittings and Steel fittings have...
