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  1. MedicineEng

    Chiller ammonia & freon

    Hello charls1: You can get the answer to your general question in a quick Googgle search.
  2. MedicineEng

    Why have internal FLS consultant ( NFPA) in Hotel design, hotel is not located in America

    We have the same situation in the property where I work and the main reason is that it is a requirement from the insurance broker. As far as I know, we don't have any US or UN contracts. And yes, NFPA consultants are extortionately expensive as they use this leverage to overcharge anything that...
  3. MedicineEng

    Evaporative cooler for indoor space - air psychrometric

    Another factor for mold growth is air circulation. If you have good air circulation, then mold will grom slower. botom line, evaporative cooling in indoors is already challenging to say the least. In a tropical setting is a definitive no no. Now, if you live in the desert or in a hot and dry...
  4. MedicineEng

    Supply Air Duct Condensation Temperature

    what are you cooling? Remember that there are other sources of water vapour in an area besides infiltration and outside air. And typically plenum areas are warmer than room temeprature.
  5. MedicineEng

    316SS vs 304SS pump for RO water application

    In RO systems, typically people expect to have SS316L. Everybody else already touched important points, but I would just wanted to raise one that it hasn't been touched before. The final use of the RO water also an important decision factor. If the RO water is going to be used, say for crop...
  6. MedicineEng

    Sewer Pumping Downhill

    With the utmost respect [bow], I'm stealing the expression "slime stripping velocity" to use in one of those endless meetings where I hear BS left and right. I can already see myself saying: "Guys, we need to reach slime stripping velocity on this one"...
  7. MedicineEng

    Bad mentoring for job stability

    As someone already said, your today's mentored intern might be your tomorrow's manager. It happened to me. I started as an intern and had a mentor that at the time had kids older than myself. He took me under his wing and taught me a lot. A couple years later there was a split on my department...
  8. MedicineEng

    Corridor false Odor when Occupied with people

    If you are going to recirculate conditioned air back into the space for energy saving reasons, you will need to go through some form of filters or ionization to remove the odour before supplying it back to the space. If you are installing additional exhaust you will need to be sure that the...
  9. MedicineEng

    Commercial Kitchen Exhaust

    Raj. S: Clearly you need professional help on this one. The help that we can give you in an open free forum has to be taken always with a grain of salt (pun intended)and is limited in nature. People here will do their best to guide you in the right direction as we are all fellow engineers and...
  10. MedicineEng

    Commercial Kitchen Exhaust

    You are absolutely right. Maybe my wording was not clear, apologies. I wasn't suggesting installation of turning vanes on KED. I was just highlighting the fact that being the duct already close to the recommended max speed, further increase would eventually create drumming noises that would be...
  11. MedicineEng

    Commercial Kitchen Exhaust

    Another point to consider is drumming. If the duct is undersized for the airflow and the there are 90 degrees turns without turning vanes youmight have drumming noises/vibraton which is really annoying and debilitating. If you have the exhaust duct passing through other areas befoer it's...
  12. MedicineEng

    Heat generated by LED lights

    I never thought of visible light as heat but it makes sense. Also, I understand if some of the heat has gone to a void that this won't be loading the HVAC system. Thank you all for your feedback.
  13. MedicineEng

    Heat generated by LED lights

    Hi AlL: I have to make a HVAC cursory analysis of an area that we are repurposing which will have a big increase on LED lighting quantities and power. I was trying to get some information on how much actual input power is dissipated as heat in case of LED lighting, but a ggogle search gives me...
  14. MedicineEng

    Monsoon weather conditions for HVAC

    It also depends to what are you designng for. I would say that if it is a health facility or a silicon wafer manufacturing plant, I would design for worst case scenario. If you design for an apartment block, you can use the local weeather bureau data or ASHRAE. Just my 2 cents on this.
  15. MedicineEng

    Cost of Hydrostatic and Pneumatic Test

    Unless absolutely prohibited to do a hydro test (ex. in a refractory lined vessel/pipeline), I wouldn't even consider pneumatic test.
  16. MedicineEng

    Energy Savings Calculation by replacing Ammonia chiller with Desiccant Dehumidification

    As said above, don't forget of the external heating and cooling source that you need to regenerate the desiccant. A few years ago, we were looking on dessicant dehumidication and it looked quite interesting until we factored in the heat necessary to regenerate the dessicant which was the (big)...
  17. MedicineEng

    karma-dharma

    Sorry, I'm lost. What is this discussion about?
  18. MedicineEng

    Replacement bladders for potable water expansion tanks

    I've previously posted this thread at the pump engineering forum but was rightly suggested that this would be a more appropriate forum for this question. Good morning all: Here at our porperty we are having some issues with finding replacement bladders for our potable water expansion tanks...
  19. MedicineEng

    Replacement bladders for potable water expansion tanks

    Good morning all: Here at our porperty we are having some issues with finding replacement bladders for our potable water expansion tanks. Most are sold by Grundfos or Reflex and the contact with the original manufacturers has not been the best experience. Despite their catalogue claims...
  20. MedicineEng

    HOTEL KITCHEN PROPER VENTILATION

    If you really want to see if your supply air is being short circuited directly into the exaust and air distribution patterns inside the kitchen, you can perform a smoke test. Assure that kitchen is negative. As said above, it is highly unusual that a kitchen is kept positive in relation to the...

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