Recent content by naifmbo

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...

we do not want That tank to have design temperature but for emergency within 3-4 from setpoint (maximum). So,how many minutes this tank can keep this temperature range,what we need is a formula for tank temperature with time (mixing process)? thanks alot.

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...

Thanks Yorkman for your replay, Both chillers are air-cooled reciprocating compressor. Trane chiller has 325psig high-pressure cutout,but for york chiller it is around 360psig. Trane compressor suction temperature 30-35c. How can i inspect the txv's cap.tube? note: If there is no flow compressor...

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, how is the dirty evaporator effects the oil return ? 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, i have an envirnomental chamber with 2 circuits (R22 and R13), that chamber cooling an industrial samples to -60c. Ambient temperature may reach 35-40 c, both circuits has the same compressor :COPELAND DKJB-75EWL. Thankyou wzal,