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  1. 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...
  2. 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...
  3. 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...
  4. MedicineEng

    Corrosion inhibitor on wet fire sprinkler water

    All: Recently we started having a couple of events of pinholes leaks on our wet fire sprinkler pipe system. Since these have affected some high end retail area in our property, obviously people are looking for some solutions/mitigation of future occurrences. When we checked, the standing water...
  5. MedicineEng

    Hot Water Temperature supply to commercial kitchens

    Hi All: With the current energy prices going through the roof due to the war on Ukraine, there is new found interest among our senior management on energy savings in our property. Proposals that in the past were hitting deaf ears with the remarks of :"This is not the way to that we do things...
  6. MedicineEng

    FCUs vs. VAVs

    An interesting discussion came the other day when checking new design drawings and design assumptions for a potential new event center that we will hopefully build somewhere in the near future. When evaluating HVAC options for BOH areas, 2 factions emerged: The FCU faction and the VAV faction...
  7. MedicineEng

    moisture content/acid number on compressor oil analysis

    Hi All: Recently we performed our chillers and heat pumps oil analysis to decide if oil replacement was warranted. When we received the reports from the equipment manufacturers there were a couple of values that were kind of strange to me: Chillers manufacturer oil replacement levels are: 50...
  8. MedicineEng

    Automatic Balancing Valves-ABV

    Hi everybody and Happy New Year: For a new expansion project that we are currently working on, a discussion came across the group that for our hotel tower, we should use automatic balancing valves to regulate our guestrooms toilet exhausts. We are looking into these products Link On their...
  9. MedicineEng

    SKF vs. FYH pillow Block bearings

    Hi All: In our AHUS we have been using SKF pillow block bearings since opening, almost 6 years ago. Recently one of my managers came and pitch me aa suggestion to use FYH bearings instead. I never worked with Japanese brand so I don't know exactly how these stack up against SKF's. Anybody...
  10. MedicineEng

    Copper pipe annealing

    Hi All: We are having quite a few copper pipe leaks in our property's hot water system. These occur almos exclusively in the vicinity of elbows and by the damage profile seems to be provoked by erosion corrosion due to high water velocity. We measured the water flow at the balancing valves and...
  11. MedicineEng

    Sprinkler head and cover in Steam room

    Hi All: In our property's spa steam room has a concealed sprinkler head installed for fire protection. The challenge that we are facing is that every couple of months, sprinklers brass body and painted concealing plate start to rust and need to be replaced. We already tried to search for...
  12. MedicineEng

    Pillow Block Bearing Fan Replacement

    Hi All: A couple of weeks ago, there was an interesting discussion here at the workshop on 2 opposite sides and there was no clear winner, so I've decided to put that to this forum to hear your opinion: In a fan shaft with 2 pillow block bearings installed, when you replace one of the bearings...
  13. MedicineEng

    Automatic Lubricators

    Hi All: I've been studying the possibility to introduce automatic lubrication in our AHUs/Fans/etc. pillow block shaft bearings. I want to take this task away from our technicians in order to release some manpower to other stuff and also to have some consistency in the lubrication program...
  14. MedicineEng

    Legionella sampling procedure

    Hi All: In a property close to ours there was recently a confirmed Legionellosis case. Further analysis to the water systems on that property cleared it as the Legionella source. Either way, given the local media exposure, this triggered a full bezerk mode in our top management and they...
  15. MedicineEng

    Industrial kitchen cooking smell exhaust treatment -Ozone treatment

    Hi All: We are now looking into some of our industrial kitchens in order to improve the cooking smell exhaust. Originally we had an electrostatic filter and bag filters installed as cooking smell mitigation process but the performance was pretty poor, as the ESP got clogged with grease and...
  16. MedicineEng

    Natural Gas for steam boiler

    Hi All: I'm making some ball park figure calculations to estimate how much a laundry steam press would represent in terms of natural gas consumption at the steam boiler but I'm getting some numbers that don't seem right, but I can't find where my potential mistake might be. Data: Steam press...
  17. MedicineEng

    Calculating water velocity in hot water pipe

    Hi All: I'm currently running some water velocity tests on a hot water pipe loop and came across somethin strange that would like to get some help from the forum: The team used 2 methods to measure pipe velocity and we are getting very different results. Both of them seem adequate, so I'm...
  18. MedicineEng

    Recovery of cooling tower blow down water

    Hi all: Recently I had an out of the box idea to recover blow down water of our cooling towers (which in Summer can be in the range of 80-110m3/day) and would like to pass it through like minded individuals as the ones that visit this forum before I take it up on the corporate chain. Our...
  19. MedicineEng

    HVAC guidelines for Hot Pot type Restaurant

    Hi All: In our property we are reconverting a normal Western type restaurant to an Asian hot pot type dining. For the ones not familiar with this concept, a bowl of soup (usually of a spicy numbing hot type) is brought to the table and kept boiling with electric plates. Then people basically...
  20. MedicineEng

    Natural gas consumption to produce 10m3 steam from room temperature water

    Hi guys: I confess that I'm not at ease with thermodynamic calculations regarding steam production and I need some help checking my calculations I am trying to calculate how much natural gas a boiler would consume to produce 10m3 of 8 bar steam from room temperature water and I am reaching...

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