Recent content by saeedplc

Dear Experts Your reply will be highly appriciated

‌Dear Experts, Is it possible to get actual air flow (m3/h) of an AHU by refering to it's fan curve in a specific frequency by having actual kw of the fan? It is a backward centrifuge fan with exact curvd in different frequency and power. Actual power kw and actual RPM is displayed on VFD...

Thank you for the reply, Can it also be an indicative of the wheel blockage by dust or etc?

Thanks for your reply, The filter air flow m3/h should be higher than or equal to AHU air flow m3/h? Because as far as I know final differential pressure of the filter is given in nominal flow of it so I should order a filter with a air flow equal or higher than AHU flow. Am i correct?

Hi dear Experts, I have seen a differential pressure switch across a heat recovery wheel in some AHUs. Could you please let me know the function of the DPS and how it should be adjusted. Regards,

Dear Experts, Could you please let me know what parameters should I consider to order a new G4 filter for AHU. Unfortunately there is no data on the current installed G4 filter. Any relationship bettween AHU air flow m3/h and filter air volume? Regards,

Thank you for the reply @MedicineEng In our AHU the fresh damper is always 30 % and mixing damper is 70% and only in free cooling mode the fresh air damper become 100% so with this case how should i adjust the differential pressure switch across the filter G4 ?

Thank you so much for the file Could you please let me know if you also have the fault list of the ZT37 air compressor from atlas copco?

I have searched in the google but nothing found and do not contact atlas copco I though some people herevhave the manual or even better service manual

Dear experts, Could you please help me by providing the instruction manual of ZT37 Atlas copco air compressor? Regards,

Do you apply the above formula into practice or only charge the expansion tank just the same static pressure as the point it is connected to?

Dear experts I have read some manuals from different expansion tanks' manufacturer and they have mentioned the expansion tank air side pressure should be 0.3 bar higher than the static pressure of the point to which the tank is connected. If the air pressure of the tank is the same static...

If I have understood well you mean both the fan speed and the valve's position should be controlled by the temperature sensor inside the room?

Thank you so much for the reply To be honest there is neither data available from the designer nor any diagram. You are completely right I need to get some actual value then decide about the situation. Dear @EnergyProfessional could you please let me know how a fan coil should be controlled by...

Yes the actuator is analoge type (0to 10v) and the fan coil is 4pipe type Two picv valves are used to control cooling and heating coils The valves are controlled from BMS system and a dedicated controller from siemens. The actuator percentage is controlled by the room temperature but the...