Hi,
we have two chillers stations,one with three chillers(75 ton/each- two run) and long pipes (3000 meters),and the other circuit with two chillers (75 ton/each - one runs) and short pipes (200 meters) , we want to redesign the pipes to connect these two circuits in one circuit to make more...
hi,
we want to add a storage tank to our chilled water circuit to store cooling capacity in case chiller has failed. How can we model this tank(transient system) to know how many minutes this tank can carry the load?
thanks.
Hi,
We have an old MPC Chamber with R502/R13 cascade system,there are two valves in the system , one for R13 SHORT CIRCUIT SOLENOID VALVE and the other for RES.13 INPUT SOLENOID VALVE,can anyone explane the functions of these two valves, because pipes completely covered by insulation?
(Any body...
Hi,
i am trying to replace unknown model txv of 75ton trane chiller(one circuit),i fixed a 55ton (ove55-cp100- nominal)txv which is running in 125ton york chiller (two circuits),but parameters were:
suction pressure : 45 psi (very low)
leaving and return water temp: 40 c
condensing pressure ...
is it possible that in an inclined discharge line from the pump that the static pressure in the lower level(50 m from pump discharge) will be higher than that in the higher level (pump discharge)? if it is ,how water will move from low to high pressure?.
thanks.
Is it possible that the air in the centrifugal chiller condenser can effect the current consuming in the starting,i think the vane will be 100% closed in the starting!!!
thanks.
hi everybody,
Is it practical to avoid the oil escape from compressor (due to the low load) by reducing the interval of unloading time,i mean to specife a restart setpoint temperature higher than the water setpoint by 2 degree , we start loading compressor quickly until we reach the setpoint...
Hi,
what is the pump-down cutout setpoint,is it the low pressure cutout,in other hand,can we go lower than that setpoint to be sure that there is no liquid exist on the start-up of the cmpressor,because we have an old trane chiller using the low-pressure cutout setpoint for the pump-down...
Hi everybody,
Is there a formula we can use to get R-22 saturation temperature from the saturation pressure without using that ph table?
i need that formula in my contrl program.
thanks.
Hi,
How can we creat a data file in s7-300?
for example for refrigerant R-22
temp-----------pressure
0c 10 psi
1c 20 psi
3c 30 psi
4c 32 psi
.
.
and so on.
thanks.
Hi everybody,
Is it true that lower condensing pressure means higher capacity? if it is true,what about the required deltaP for the expansion valve?
Thnaks.
hi everybody,
can i use the pid-loop output to control my recip-compressor's loading solenoid valves, for example:
solenoid valve 1 will be energized if pid output > 10 %
solenoid valve 2 will be energized if pid output > 30 %
and so on..
and why?
thankyou alot.
HI EVERY BODY,
HOW CAN I PROGRAM MY S7-300 IN FBD TO GET MY CHILLER OPERATING HOURS,BECAUSE THE TIMERS AVAILABLE ARE LIMITED BY 2H46M30S(HOURS,MINUTES,SECONDS)?
THANKS.
hi everybody,
i have two chillers plant controlled by siemens s7-300 station,this station software includes FB used two times in station's software (for each chiller),this FB has two instance data blocks(for each chiller). when i monitor one of them (FB) i see the parameters flactuating between...
Hi everybody,
we have removed the acid-removing core from my trane chiller's dryer shell,after that we got problem of oil return ,do you think this is dut to the empty suction dryer shell,becuse we did't install any filter or core in that shell?
thanks.
hi everbody,
We had trane chiller(75 ton, one recip comp) working with suction acid-removal core for at lease one year - with normal oil level,then we decide to remove this core and keep that shell empty (without any filter),now we have abnormal oil level in compressor sight glass.
Is the empty...
