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  • Users: COMAPRO
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  1. COMAPRO

    air conditioner driven by gas

    Does any body have experience with such an air conditioner . How expensive are they , lets say a 36000 BTU/HR ? Any manufacturer I can get in touch with ? thanks in advance for any tip you can tell me
  2. COMAPRO

    Ideal room air temperature for data center

    thanks a lot , all you guys for your valuable answers.
  3. COMAPRO

    Ideal room air temperature for data center

    thanks guys for your promtly reply.
  4. COMAPRO

    Using a low voltage current transformer in high side ( 13200 V ) power

    thank you guys for your promtly reply.busbar , to my knowledge a 15 KV insulated cable always has a wire to be grounded . Davidbeach , according to your opinion my friend s action is ok but what do you mean by "15 KV class gear " ?( I am not an electrical engineer)and you jbartos , if...
  5. COMAPRO

    Using a low voltage current transformer in high side ( 13200 V ) power

    A friend of mine is using a low voltage current transformer to measure the current is passing through a 15 KV insulated cable in the high side of a power transformer. He states that it is working ok and he is saving a lot of money in the instalation because instead of using the right 13200 Volts...
  6. COMAPRO

    Ideal room air temperature for data center

    does anybody know what should be the ideal room air temperature a cooling system has to keep in a data center in order to avoid a computer equipment damage ? I would appreciate very much a promtly reply.
  7. COMAPRO

    Why temperature difference not more than 10 degrees

    thank you guys for all your tips. I am gonna set thermostat at 75F and see how long it takes the cooling system to bring the outside humidity, 90% , to 50% looking at a relative humidity meter
  8. COMAPRO

    Why temperature difference not more than 10 degrees

    hi 1969grad , I am talking about a bulding that has air conditioning all year around and about employees that they dont care how high electricity bill goes. I have been hired by the employer to find out what would be the right setting that he wont pay too much for electricity and in the other...
  9. COMAPRO

    Why temperature difference not more than 10 degrees

    Pennpoint , I am trying to become an expert in energy savings issues and I see that here at home the employees set the thermostst temperatures very low 55 to 65 degrees and they do not realize that the compressor has to work all day long trying to reach the temperature setting, specially if the...
  10. COMAPRO

    normal confortable temperature for 90% relative humidity

    thank you for your tip , penn point but I live outside the United States an usually the books get lost underway . I still think that with the current technology through internet one can get the right information, not only fast but also free. thanks anyway
  11. COMAPRO

    Why temperature difference not more than 10 degrees

    Thank you pennpoint for your promtly reply. the statement " not more than 10 degrees diference I have read it in acouple of technical documents but they do not define the technical reason ? does it have to do with the health of a person or what ? I am an industrial engineer and I am not...
  12. COMAPRO

    normal confortable temperature for 90% relative humidity

    What would be the normal temperature one shouls set the thermostat for cooling if the relative humidity is 90 % or above ? is there somewhere in internet a web page where I can see something like a table for a relationship between relative humidity and ideal thermostat temperature settimg ...
  13. COMAPRO

    Why temperature difference not more than 10 degrees

    I wonder what is the technical reason that the temperature indoors should not be less than 10 degrees of the temperature outdoors. If the temperature outside is, for example , 95 degrees then the temperature inside should be 85 but that is still unconfortable. Dont you think so guys ?
  14. COMAPRO

    How to calculate KW losses in a unbalanced motor

    GGoss , thank you for your tips but let me try to explain myself better.first of all , for me "dearting" means reducing , in this case the load but I am after the KW savings if no losses are generated because of current balancing based that voltage is balanced. therefore I thought that...
  15. COMAPRO

    How to calculate KW losses in a unbalanced motor

    Baldor, unfortunately your post did not answer my question . I talk about current unbalanced and not voltage unbalanced. Anyway thank you for the try
  16. COMAPRO

    How to calculate KW losses in a unbalanced motor

    I Know that if the current is unbalanced in a three phase motor , heat develops and the life of the winding coil is reduced. The formula to calculate the loss in KW is I x I x R but how do I calculate easy the R value in a motor , is it not a table available where one can read the % losses if...
  17. COMAPRO

    KW losses in a transformer bank

    a customer of mine has a trnasformer bank , 3 x 100 KVA , which 300 KVA totally, the Demand is only 120 KW and has capacitors to keep above 0,92 the power factor of the plant. the question is is there any KW losses at all because the transformer bank is over designed for the plant operation ? if...
  18. COMAPRO

    Why Harmonics in a three phase motor ?

    Thank you electricpete for the tip . the motor belongs to a customer of mine . I will se if he wants to disconnect the capacitors. Remember that they are there to improve power factor. Lets say that the current harmonics decreases without the capacitors but he would be penalized because of low...
  19. COMAPRO

    Why Harmonics in a three phase motor ?

    the motor is a standard squirrel cage three phase motor . it is running delta at 230 volts. the rpm are 1800. the readings are normal in the other motors . no unbalanced at all in current or voltage. the motor drives a stone crusher
  20. COMAPRO

    Why Harmonics in a three phase motor ?

    Today I measured again the current harmonics on the motor under regular load and it was changing rapidly between 10 and 15 % . --the 5th harmonic was the highest one . the measurement was done at the breaker of the wye delta starter , not right at the motor terminals. The breaker is located in a...

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