Tek-Tips is the largest IT community on the Internet today!

Members share and learn making Tek-Tips Forums the best source of peer-reviewed technical information on the Internet!

Register Log in
  • Congratulations TugboatEng on being selected by the Eng-Tips community for having the most helpful posts in the forums last week. Way to Go!

Search results for query: *

  1. jspath2339

    ECMs on large pumps

    I believe your question boils down to efficacy/efficiency. In general, a VFD is more effective at maintaining a certain flow rate. But it costs more. The difference between a variable speed pump with a VFD & the cost of a pump with an EC motor is not that great when looking at large pumps. If...
  2. jspath2339

    Cold water to primary circuit of Storage Type Calorifier

    OTR, This may not be helpful, as I have not worked on any systems like this, but here are some general thoughts: -Typically domestic hot water systems are required to be capable of operating regardless of whether or not other systems are operating. The manner I usually see this is in terms of...
  3. jspath2339

    positive or neutral pressure space?

    The old school way is "very positive". The buildings back in the day were very leaky, and the best way to ensure that the space is conditioned to the temperature you expect is to provide a lot more air at the temperature you want, than the outside will fill back in. Now, as the buildings have...
  4. jspath2339

    Positive/overpressure with exhaust/intake fanss

    What is your pressure requirement, relative to various spaces? Are there multiple entrances, is this on an exterior? Now of the options that exist for maintaining positive pressure, the two most common are: -DP (differential pressure sensors) which try to affect the pressure by modulating a...
  5. jspath2339

    Minimum Acceptable Space Temperature By Code?

    I concur with GT-EGR: International code requires that the equipment be "capable" of conditioning the space to 68 deg. on a design day. You get to decide what the design day is, and also what your expected heat gain in the space is. All you are required to do is provide equipment capable of...

Part and Inventory Search

Back
Top