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Hi to all I am aware of the fact that high condenser approach is caused due to fouled condenser tubes and/or low water flow in a shell and tube condenser of a water cooled centrifugal chiller. Are there, any other reasons for the high condenser approach?. Would like to get the experts view on...

Thanks willard3 for the answer, but still I would like to know what is the reason for using or specifying the flanged connections instead of other means of joining duct sections. Does this have special application or engineering reason, need opinions of other experts as well... Thanks

Hi to all Normally the duct design and construction is divided as low, medium and high pressure system. My question is, as to when and why the flanged duct connection in supply and return ducting is required and recommended, what is the basis of this recommendation? I appreciate and thanks any...

First you need to determine the throttling range required (ie min. to max. temp. required) in your case the air branch pressure from the thermostat is assumed to be 3-13 psi for the the control system. Next measure the ambient temperature near the sensing element of the thermostat. Turn the...

Hi to all I appreciate any responses from our group of experts. Can anybody explain the function of demisters and the labyrinths in the centrifugal chillers. Thanks in advance

Trigot Thanks, The chillers in discussion are in 500 to 1000 Tons range, water cooled semi hermetic R-12 centrifugal chillers and are used for comfort air conditioning. These chillers are almost 20 to 25 years old and still working fine without major breakdown or severe problems. Definately as u...

Trigout As u have pointed out, HOT GAS bypass is in ON mode most of the time for artificially loading of the chiller. If I have not misunderstood your statement, could you please explain, How does a Purge unit eliminate the problem of low oil level during the low load conditions? and do u mean...

Hi everybody With the scheduled phase out of the CFC based refrigerant(R-12) in the near future, what would be the correct and economical solution for the existing chillers with R-12 refrigerant, is it retrofitting or replacement?.Views and suggestions of the experts in the field are highly...

Thanks imok2 for explaining the issue in a simple way, Does the same principle is used in the hermetic certrifugal chillers to avoid oil transfer between the hermetic motor section and the compressor section. Can anybody else comment as well....

Thanks very much Mr. tombmech for the advice, and as u have rightly pointed out that the OAM Purger deals with entirely a different subject than the question in the thread. However this has started a new discussion, can anybody comment on the real application of these equipments (OAM Purgers) in...

Thanks to all for providing a good information and sharing their experiences, still if anybody else can comment on the problems if any? asociated with using concentric reducer on a Double Suction Split Case (DSSC) vertical Centrifugal pump. Thanks once again....

Hello to all.. During the low cooling load demand period combined with low ambient conditions, the problem of oil recovery to the oil sumps becomes very serious and sometimes the oli level in the sight glass dispappears, this requires oil charging. Again as the demands increases and also the...

Mr bulkhandling By vertical pumps, I did not mean the vertical turbine pumps but the split case centrifugal pump mounted vertically, do we need to install the eccentric reducer for this type as well? thanks

Hello to all I have noticed using eccentric reducer at the pump suction for horizontal centrifugal pumps "Double Suction Split Case" for water pumping in HVAC application. Is this eccentric reducer required for all types of pumps like vertical centrifugal pumps and the end suction centrifugal...

Hi everybody Cooling tower basin cleaning system are being promoted by many suppliers as an easy and cost effective means of controlling and minimizing the water consumption especially in the areas of water scarcity. These systems have hydro boosters installed in the piping network which is laid...

Hello everybody What is the purpose of having Nozzles mounted or installed on the rotor shaft of hermetic centrifugal chillers (high pressure chillers) between the motor and the compressor section. I was told that their function is to create a low pressure zone in the vicinity, thereby...

Hi everybody UV-C lamps are being promoted by many reputed manufacturers of HVAC equipment as a easy and cost effective means of controlling and improving the IAQ. Can anybody comment on the pros and cons of using these lamps. Thanks

Thanks mfi2000 and SAK9 for the advices. I am planning to install a new 100 Ton chiller with a plate heat exchanger between the new chiller flow and the existing chilled water network (as I cannot reduce the chilled water flow on the building side because of the distributed AHU's inside the...

Thanks imok2, actually the Absorber Temperature Loss is done for Noncondensables Determination in a Lithium Bromide-Water based Vapor Absorption Chiller.

Hi, We have a 500 Tons capacity centrifugal water cooled chiller serving air conditioning to a special function auditorium. This building is rarely used and if use it is used for a short period of time, say 3-5 hours for exams and seminars. In addition to this during winter the chiller loads to...