ORP is oxidation-reduction potential, similar in appearance and operation to a pH probe. I have little true understanding of their exact purpose in life, but are used to measure the strength of certain redox chemical compounds. Having spent an early part of my life fixing them, the most...
At 16 degC, I probably wouldn't bother heating or energy recovering. A few degrees of delta t will help it not do what willard3 correctly said it would.
ACMV is an acronym replacing HVAC in countries that do not normally require heating.
Ask Foxboro to come on over and sort it out. Until then, use low dewpoint instrument air for the casing purge, and if you reduce the pressure abruptly into the casing with a restrictor the air will adiabatically cool. Make sure you add a nice sintered vent!
An overflow trap into a floor drain implies that the floor drain is 'directly' piped to the sanitary system. Condensate needs to go to an indirect drain (typ. a 2" air gap) to prevent sanitary backflow from entering the HVAC system. I am not sure that this configuration is accepted by the code...
When you have open drive chillers + pumps with a lot of heat load in the room, you can quickly get to a point where it is easier to install an AHU to manage the heat load than deal with a huge ventilation rate. 15 ACH is 27500 m3/h (16000 cfm) = lots of big propeller fans with a wall of your...
No, nothing to do with volume and you can't put 2 x 1" traps in series to make a 2" trap. It is all to do with hydrostatic head. If the static pressure in the AHU exceeds the pressure of the water column in the drain then the air pressure will suck or blow the water out of the trap depending...
That pipe is well undersized, but as long as the right flow is arriving at the chiller input at the right temperature, then there should be no basis for the supplier to pin it on the condenser water. There should be a service call, not a phone call. The maintenance contractor or vendor rep...
The bypass should offer a low pressure direct return for the primary loop. The point is to decouple any influence of the primary loop from what is going on in the secondary loop and vice versa. If there is a similar pressure drop to your connected network as Drazen has suggested then this...
I would say the bypass at the bottom of the drawing was intended for flushing, low flow or commissioning reasons and it would normally remain closed. If this valve is open, you will short cct the chillers and get a high return temp.
The bypass near the primary pumps is the decoupling bypass...
My old US company used to cookie cutter an exhaust extension up above the unit to add a bit of distance and reduce the chance of the exhaust being entrained in the OA. Rectangular SS duct with a drain hole.
The flow rate of any fan is only relevant when considered with the system pressure drop. The upper limit of airflow is most likely linked to the lowest pressure drop.
My worksite is laced with tunnels:
Shallow service tunnels are naturally ventilated with intermittent risers. This is a useful approach as the risers also provide an access point for getting lengths of pipe in.
Deeper tunnels are mechanically ventilated, with point to point supply and extract...
As a starting point:
If any of your AHUs require chilled water, then you have to run your chiller. You can save energy in the operation of the chiller with such things as a VSD compressor, unfortunately this and most other options are design time decisions and retrofit is not always...
