We're considering some work to reduce the condenser approach temp. e.g 6°F to 1.6°F. In order to move forward I need to calculate the cost savings.
The system has a water-cooled centrifugal chiller. Can the cost savings be calculated by using site data e.g. gpm, temperatures, power cost...
We're considering two options for additional heat rejection. The problem is that on a design day our cooling towers run at their limits and we lose redundancy with them. The thought is to either add a 1000ton cooling tower to the existing ones (largest we can fit); or, add a 350 nominal ton...
Hello All,
I was trying to figure out the amount (CFM) of outside air leaking through a closed control damper. After some thought it seems the best method is to calcualte the outside air percentage based on temperatures per the following:
x% = outside air percentage (OA%)
Ta = outside air temp...
I've searched for a design guidline for humiditiy requirement in battery rooms but have not had any luck. There is quite a lot of info regarding ventilation but not humidification.
What is a typical guidline or reference for humidity in battery rooms?
The operating condition is: chiller is at full load, utility outage and chillers shut down, generators quickly start and power is restored to restart the chillers.
If the generators start quickly and power is restored would you really need to have the crankcase heaters and associated...
Hello,
I'm looking for a generic "primer" on modern Fire Alarm System Architecture. The intent is to share info with building engineers.
If someone could point me in the right direction I would appreciate it. I've searched the web but mostly come up with consulting services. My next step is to...
Hello All,
We are installing two new centrifugal chillers (1000T and 500T) to an existing chiller plant (2400t). Existing chillers or pumps do not have VFD's. System is Primary pumping-no primary secondary loop. During this addition we are considering adding VFD's for the new chillers...
Good Day,
I'm trying to figure out an accurate method of measuring the loss of air cooled chiller capacity when outside air temp. is above design criteria.
the goal: at today's heat load and chiller loading, what outside air temp would we need to bring on another chiller?
Initially i was on...
The FPS is a dry type. The situation: the pipe is filled with water and drained during testing. Is it better to tap the branch lines out the top or bottom of the main lines?
My initial thought is to tap the branch out the top and the air can act as a cushion to keep the water out of the...
We've had several pin hole leaks develope in a dry pipe system. Unfortunetly, there are several uneven spots where we needed to add drip legs to get the standing water out. A failure analysis was performed and the result: failures were the result of MIC mostly at the seam welds in the piping...
We had an oil level switch failure on a 300 ton air cooled chiller that was apparently caused by "excessive water flow".
The excessive water flow caused the refrigerant oil to flash and migrate from the evaporator to the condenser. If chiller is fully loaded there isn't a problem. when the...
We're looking for a system to dry and filter stored diesel fuel for back-up generators. The tank is 10,000 gallons. Any suggestions on an effective solution?
Thanks
I have a room with transformers producing 126mbtu. The room is 885 sqft with 10 ft ceilings and no envelope loads. The room is presently cooled with a CHW AHU. If the AHU fails: How much time will it take for the room to heat up 15degrees? I'm trying to figure it out on paper with no luck...
