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Recent content by Emrelug84

  1. Emrelug84

    Pump Failure

    Thanks guys, Pump manufacturer had already come and dismantled the pump. The only statement from them is the problem is because of suction condition and it is out of warranty. However, they did not explain the reason of the problem in detail. I try to analyze operating conditions. Pump's flow...
  2. Emrelug84

    Pump Failure

    Thank you chicopee. It makes sense for me. I focus on that issue. Artisi, as we are engineers, i certainhly post here. I believe that somebody will help, you may not.
  3. Emrelug84

    Pump Failure

    Hi Guys, We have a boiler feed water pump operating. Recently, i have learned that it stopped working. Pump has been tripped. Shaft is not able to be turned by hand. I have checked cavitation theoretically, eveything is good. Moreover, when pump is not in operation water temperature drops to...
  4. Emrelug84

    Whirling Sound 54dB

    Can you please give us a drawing showing all dimensions, all equipments and flow rates? First, you need to analyze the design to find noise isuue.
  5. Emrelug84

    RH and DB temperature

    The answer is both no and partly yes. First of all, if you need to reduce relative humidity, you need to cool air and take its water content. Therefore, you decrease DB. However, when you finished to decrease water content, then you can heat air to the inital DB. Then, you have DB unchanged and...
  6. Emrelug84

    Sizing Carpark Exhaust Shaft

    Ventilation rate is given as roughly 7.5L/s-m2 for parking garages according to Table E-2 from ASHRAE Standard 62-2001 Addendum n. (please note that exhaust not required if two or more sides comprise walls that are least 50% open to the outside) However, It is 300L/min for min. according to NFPA...
  7. Emrelug84

    Sizing Carpark Exhaust Shaft

    Hi Ogsray, Is there possibility to fill all 6 basement carpark floors at a time? If it is so, diversity does not work to size shafts. I think shaft is sized according to the max air flow rate and you can put more than one fan with frequency drive. Therefore, you can fulfill the full air flow...
  8. Emrelug84

    cooling tower question

    Hello, Cooling tower cools water by evaporation and evaporation occurs at any temperature. In detail, air flow evaporates some at the surface of water droplet and water temperature decreases. In that process, water temperature approaches to the wet bulb temperature (min. 5oC difference between...
  9. Emrelug84

    Flexible Duct Size

    Hello, Recommended noise rate for office area is RC 25-35 according to ASHRAE Sound and Vibration Controls. It had better to look at octave band sound pressure levels. For office (assume NR30), noise levels are 57db, 48db, 41db, 35db, 31db, 29db and 28db for 63Hz, 125Hz, 250Hz, 500Hz, 1000Hz...
  10. Emrelug84

    Kitchen MUA heat calc

    Hi Emalysd, Make-up air is usually supplied the edge of the hood to prevent the smoke release to the kitchen area. Theoretically, all make-up air should be exhausted by the hood. However, it is hard to say that since there may be turbulence in make-up air flow and some of air is released to the...
  11. Emrelug84

    20L/s kitchen cooker hood / extractor

    Hi Stadamack, Possibly you mean 20L/s per something! Right? According to DW171, there is method-7 finding approximate flow rate for canopies and stating that 15-20L/s air extraction per kitchen area. What i try to say you miss something, after clarifying this, maybe we can help. Regards, Emre
  12. Emrelug84

    Sensible heat factor for indoor units

    No, indoor unit must satisfy the sensible heat load first, then check the latent load later.
  13. Emrelug84

    choose right air cooling chiller

    Hello yfuo28, There are more parameters than you think, it affects chiller performance directly and indirectly. Firstly, air temperature is the parameter that you should think since your water circuit is cooled with air. As air temperature is low, chiller performance is increasing because...
  14. Emrelug84

    Aircon HP salesman is asking

    The cooling capacity of air conditioners is usually measured in tons. One ton equals 12,000 BTUs (British Thermal Units) per hour. The term one ton comes from the amount of heat required to melt a block of ice that weighs one ton. 1 TR = 3.5167kW Therefore, it had better to ask what ton of...
  15. Emrelug84

    ESP For Fan Located at roof

    Hi Russell, The calculation is wrong. The phenomena is called as "thermal gravity effect". You have to compare the air inside the duct and ambient air. when air in the duct is hot, then it rises even roof fan is not in operation. Air is cold then it goes downward. How it is calculated is as...
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