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  1. 1HVACEngineer

    condenser water sump

    mejia198021, It has been my experience that the function of a condenser water sump, in a utility plant, is identical to the basin/sump in a cooling tower. The exception is that instead of the basin/sump being part of the cooling tower, it is usually a concrete basin/sump containing submerged...
  2. 1HVACEngineer

    reference book on refrigeration

    vinod68, I am not sure if this is what you need, however I would first recommend referring to the "ASHRAE Handbook Refrigeration": http://www.ashrae.org/. Additionally, I often refer to the "Trane Air Conditioning Manual": http://www.bookmarki.com/index.asp?PageAction=VIEWPROD&ProdID=1116...
  3. 1HVACEngineer

    Best Professional HVAC software

    ramcode, So far as I know there are 3 main software packages available: Trane TRACE™ 700, Carrier E20-II HAP, and Elite Software CHVAC. There are a number of arguments for and against each of the packages; I would recommend downloading the demo versions and trying them out. Personally, I...
  4. 1HVACEngineer

    Fuel oil pipe sizing

    A great source of information is "Preferred Utilities" http://www.preferredutilities.com The website has many useful charts and information. They also have some simple software and a VERY valuable design guide that accompanies it "DESIGN CONSIDERATIONS for OIL SYSTEMS SIZING". It has been my...
  5. 1HVACEngineer

    Is it worth it to get a PE license?

    BobPE – Thank you for the acknowledgement. As I stated it was a professional goal I had set for myself. I was very happy to have accomplished it. ghghghgh – I have no regrets about getting my PE. 1HVACEngineer, P.E.
  6. 1HVACEngineer

    Is it worth it to get a PE license?

    I recently took the PE exam, in PA, for the first time and passed. However, I have to agree with buzzp in that my personal experience is that the test is a load of you know what. Approximately 75% of the encountered problems were not relevant to the real world situations. I took this test as...
  7. 1HVACEngineer

    Question about the industrial building pressurization

    My apologies. Eq(8): Q = 776•C•A•(2•delta_p/Density)^0.5 = 4005•C•A•(delta_p)^0.5 Q = volumetric airflow rate, cfm C = flow coefficient (typically 0.6 to 0.7) A = flow area (leakage area), ft² delat_p = pressure difference across flow path, in. of water Density =...
  8. 1HVACEngineer

    Question about the industrial building pressurization

    lilliput1, My company, specifically NorthEastern US offices, cater almost exclusively to the Pharmaceutical Market. We have tables developed to calculate the differential pressure across doors, similar to what you mentioned "table of door sizes & typical crack dimensions & come up with CFM...
  9. 1HVACEngineer

    How to allow a user to modify a cell but do not delete it?

    Try this out and see if it does the job. I took the liberty of using Worksheet_BeforeDoubleClick for Adding 1 from the cell value and Worksheet_BeforeRightClick for Deleting 1 from the cell value. Private Sub Worksheet_BeforeDoubleClick(ByVal Target As Range, Cancel As Boolean) Dim Msg...
  10. 1HVACEngineer

    BIN method and Degree Day

    DEGREE DAY METHOD Degree Day concept was first developed to compare indoor comfort conditions to outdoor temperatures. For example, Heating Degree Day (HDD) with a Base Temperature of 65°F; assumes that whenever the outdoor temperature drops below 65°F you will require heating. Typically...
  11. 1HVACEngineer

    Local max and min in Excell

    Speedy, Within excel there are built in functions, which are predefined formulas that perform calculations by using specific values. The functions you will need to use on the table of values are as follows: The function MAX(number1,number2,...), returns the largest value in a set of values...
  12. 1HVACEngineer

    Calculation of Pressure Drop in Divided Flow Branches

    lilliput1, I attempted the calculation using the fitting you suggested "14.20 Table 14-10E. Elbow, Rectangular, Mitered w/ Converging or Diverging Flow"; the results did not match the bullhead tee. I believe the difference between the two fittings would be due to the airflow through a single...
  13. 1HVACEngineer

    Calculation of Pressure Drop in Divided Flow Branches

    ChasBean1, The calculation was performed on the longest run/highest pressure drop in the system. I agree with your point that the smaller duct may in fact have a higher-pressure drop, however the largest pressure drop in the system is through the larger branch. Refer to SMACNA "HVAC Systems...
  14. 1HVACEngineer

    Calculation of Pressure Drop in Divided Flow Branches

    I am calculating a pressure drop in a return duct system and have come across a fitting that does not have a Loss Coefficient listed in the SMACNA "HVAC Systems Duct Design". Refer to Figure 2-5 in the SMACNA "HVAC Duct Construction Standards Metal and Flexible" on page 2.7, titled "Divided...

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