Hello there.
How is maintenance structured at your site?
I mean, how is the interaction between maintenance, operation and Planning department?
Who's " the boss"?
Does Operation have the autonomy to allow or not a maintenance service to happen?
Does planning dept plan activities without...
Hello there guys, thank you all for your inputs so far!
It's a 60 HP motor (nominal current @380V = 84,5 A).
So to check the cause of current unbalance, I should then swap phases and see:
-if current unbalance is still present in the same motor phase, its a winding/motor problem;
-if current...
@waross
Thanks for your input !!
Here's measured voltages:
R-S = 384 V
S-T = 383 V
R-T = 382 V
That's 0,3% unbalance.
Therefore current unbalance is 8,7 times greater than voltage unbalance (= 2,5% / 0,3%).
I've looked up that current unbalance can reach up to 10 times voltage unbalance. Is...
Hello there,
What are acceptable ranges of current unbalance in three phase motor?
Considering:
current unbalance = (max deviation from average current) / average currrent
I have this motor that powers a pump:
R=87 A
S=91 A
T=88 A
AVERAGE = 88,7 A
MAX DEVIATION FROM AVERAGE = 2,3 A
CURRENT...
I want to predict how much i must expect to charge it. using calculation method.
that's prior to charging itself and monitor subcooling and superheat to adjust charge.
i dont want to drain it and recharge it.
anybody has a objective method?
If positive displacement compressor (such as scroll) has constant flow no matter the resistance in the system, how can TXV control flow?
Or it doesn't?
I have a system with several fancoils with pressure independent balance and control valve (IMI HYDRONICS TA FUSION-P 50)
However, some of them are showing strange behavior:
In automatic mode, at some point during operation, even though valve actuator is fully open there is no flow, so...
Hi there guys,
In which type of operation (parallel or primary/backup) will chillers and pumps last longer?
As:
Parallel = more working hours more less stress
primary/backup = less working hours / more stress
Try CYPETHERM LOAD. It uses RTS and it's free trial. http://cypetherm-suite.en.cype.com/
What about Revit for load calculation?
Although you are looking for software, what about excel sheet? It's simple as you want.
offtopic = I wonder how good is Revit for duct calculations - specially when...
Manufacturer requests ventilation openings (with proper filtration!) to provide cooling in case you don't have HVAC unit.
If you have HVAC unit, you'll only need a little bit of ventilation to keep positive pressure and avoid infiltration of untreated air.
@LittleInch,
By 'typical hotel' I mean I don't have interest in those 6+ stars extremely luxury hotels - but anything below that would be highly appreciated, including business, budget and vacation hotel.
In fact, right now I'm doing a study for a business hotel, so I can say it's my priority...
What I am looking for is typical hotel guest room occupancy schedule for central cooling plant sizing and energy consumption analysis during design period.
I have found this information in the link below:
https://www.energycodes.gov/development/commercial/prototype_models
It's not for control...
Hello there,
I'm doing a study on hotel's chiller sizing and I'm looking for a typical hotel room hourly occupation profile.
That is:
From all room that were sold, how many are actually occupied (guest is inside the room), for every hour of the day?
Example:
- 11a.m. = 20% (100 sold rooms...
