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MPdesign

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Everything posted by MPdesign

  1. MPdesign
    The forum topic on "Combination systems help". I was just paraphrasing! Cheers!
  2. MPdesign
    If it is cool outside but warm in the building, it opens the damper further thereby using the outside air as cooling instead of using the compressor. Also called "Air side Economizer" or "Free Cooling" The compressor may be turned completely off completely or "partially left on" for dehumidification in some instances and control schemes . Considering your last post about cleaning calipers in closed systems, I think you are just pulling my leg about forgetting what that is though. [:-thumbu] Cheers
  3. MPdesign
    Terry, Thanks for your help. If I get a large portfolio of work in Ohio, I will definitely try to send some of it your way.
  4. MPdesign
    Hello All, I know that I have some pretty lame brain questions sometimes so why should this be any different? [:-dunce] Is it possible to tell visually if a unit has an economizer or not without opening the unit and looking inside at the damper? I have included a few rooftop package unit examples. Click to Enlarge 44.89 KB Click to Enlarge 42.09 KB
  5. MPdesign
    Just an exhaust fan... Thanks Terry!
  6. MPdesign
    In a strip shopping center or other similar, is it prudent to recommend replacement of the entire unit with roof replacement (if over 15 years old) or what is proper recommendation? Cheers!
  7. MPdesign
    What about fresh air requirements? It would seem to me that if you lived up north and you have to bring in outside air (and preheat or otherwise), then there would be some power consumption there. Anyone know how they get around this? It just does not seem that you could get enough heat from the energy recovery system considering your solar panels are covered in snow and the energy recovery is likely to freeze up.
  8. MPdesign
    I am sorry that I have stated this poorly. I do not want to design anything. I understand how everything works. What I am doing is energy saving calculations that require some estimate of how long the water tower pumps are pumping over a year. No-one on site usually has any idea. Thank you again fro your help.
  9. MPdesign
    The system provides condensing water to heat pumps as well as condensers for non-heat pumps. Mostly heat pumps though. Yes, there is a boiler to increase the temp if it gets too cold because efficiency goes in the dirt if it is too cold in the winter.
  10. MPdesign
    I have an open loop cooling tower that goes to heat exchanger. On the other side of the heat exchanger is closed loop condensing water for packaged (or Unitary) self contained units. Any idea what % of the time the cooling tower open loop would pump? Any idea what % of the time the cooling tower closed loop would pump? If this changes per season - then summer / winter and DC vs Florida. Thank you for your help [:-graduat
  11. MPdesign
    I see people say that this can be added, where not already in place, as an energy saving measure. That is just misinformation... Thank you all for being so helpful.
  12. MPdesign
    What did that system cost (in ballpark terms). I'm guessing about $5-8k per 150 -200 cars. Is that close?
  13. MPdesign
    Thank you. I thought it was - but I do not like to guess. On another note, I am finding that carbon monoxide sensors are in the range of $1,000. This is certainly not a $1,000 device.
  14. MPdesign
    That was my first thought but the dial goes to 215. I guess that could be because it is an "industrial control". That is a little crazy high. Is anyone sure that this is a thermostat? I am also wondering if it could possibly be a Carbon Monoxide sensor. Alternatively if you are not sure what it is - BUT if you know it is NOT a CO sensor, please post. This should have a CO sensor but this is all that I see on it. Built in the 80's. Thanks
  15. MPdesign
    I was looking at a large ventilation fan in a sidewall of a parking deck. Does anyone know what this controller is? The dial goes from 35 to 215. Thank you! Click to Enlarge 25.87 KB Click to Enlarge 30.81 KB
  16. MPdesign
    How do I determine chiller efficiency? Given an existing unit? I would be happy with knowing the manufactures reported efficiency as a start. I read everywhere that it is on the nameplate but I don't see it on the chiller? Thanks
  17. MPdesign
    Terance, On the Shell and Tube Heat Exchanger, the building does not have a chiller. It has five 20 ton self contained units throughout the building. Any idea of why the setup is like this with the two heat exchangers? It is an older building. Thanks
  18. MPdesign
    Packaged Unit or Self Contained unit? What is the difference? I am being told they are different but I thought they were the same.
  19. MPdesign
    I have a water tower with an open loop condensing water system to plate heat exchanger then a closed loop in the building. Why? I know the possible reasons of ease of future addition & isloation for chemical treatment - but why else? Also, there is a second heat exchanger (appears to be shell and tube). Why? Click to Enlarge 48.47 KB Click to Enlarge 58.46 KB Click to Enlarge 51.89 KB Click to Enlarge 58.75 KB Click to Enlarge 49.77 KB Click to Enlarge 42.39 KB
  20. MPdesign
    Team, Yes, I am talking about a commercial chiller. My problem is that people normally say they have a life of 30 years but I see *MUCH* older chillers all of the time. They can last much much longer. So it sounds like they should be rebuilt every 4-5 years. Anyone have a budget for this? Does this sound right based on the above? $125 per hour*2men*80hrs per man = $20,000 + say $5,000 for eddy testing? Is this $5,000 reasonable for eddy current testing? Would it cost about 50% more for a 300 ton?
  21. MPdesign
    Reference: Chiller rebuild cost and frequency What are "ballpark" chiller rebuild costs: 100 ton, 300 ton, 500 ton How often should they be rebuilt? What is recommended life. From experience I would say 40 years; but, is that really a good idea?
  22. MPdesign
    Team, I need help in determining whether a pump assembly is a condensate pump or a feedwater pump. Can anyone tell me the differences? Cheers, MP Click to Enlarge 21.69 KB
  23. MPdesign
    Guys, I was sent this picture and I am just not well versed enough to know for sure[:-wiltel]. Can you help me? Is this a steam or heating hot water boiler? What are the signs to look for? For example: Is the piping different? What will the temp gauges say for each? Are the fittings different? Will there be different clues at the AHU coils? Hot water pump in one but not in the other. What are the clues? Also - what about high pressure vs. low pressure steam... Click to Enlarge 57.11 KB
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