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  • Users: Cooky
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  1. Cooky

    Wireless RS485 communication

    Hi, I am trying to communicate with a Lange SC100 controller using a Modbus protocol operating on RS485. I have established 'hard wired' communication with an OPC server running on a PC with Win XP. Having established hard wired communication, I am now using a pair of X8200 wireless modems...
  2. Cooky

    Integration of Flow

    Hi, Here's my problem: I am measuring the flow rate from a flow meter, the device gives me a 4 - 20mA signal which I am sending to a National Instruments controler. The flow meter is calibrated in kg/hr, and I need to convert the analogue signal into a totalized flow (kg). I know this can be...
  3. Cooky

    Steam Trap Passing Rate

    Does anyone have typical steam loss rates, which would give me the approximate consumption of steam through a passing steam trap. Ideally, I need this information for standard trap sizes (1/2", 3/4" & 1"), and for different types of traps (inverted bucket, TD, float etc). I've contacted a...
  4. Cooky

    Free Pipe Sizing Program

    This is a copy of a post from another forum, I've put it here for those who don't visit the HVAC forum..... I have written a program which calculates the pressure drop of fluids flowing through standard sizes of pipe, from 10mm up to 3600mm in diameter. The program also calculates useful...
  5. Cooky

    Free pipe sizing program

    I have written a program which calculates the pressure drop of fluids flowing through standard sizes of pipe, from 10mm up to 3600mm in diameter. The program also calculates useful thermophysical properties of water, ethylene glycol & propylene glycol. These properties are corrected for...
  6. Cooky

    Fluid properties required

    I am writing a freeware program to calculate the pressure drop of liquid through standard sizes of pipes (up to 300mm). To make the program accurate, I intend to allow the user to adjust the liquid temperature and the % mixture of glycol with water. What I need is tabulated data which gives...
  7. Cooky

    Converting dB(A) into NR

    I am creating an Excel spreadsheet for my company which predicts the average acoustic pressure dB(A) when the sound power level is entered at each octave band. I've completed this part of the program and it seems to work ok. I would also like to show the predicted NR level, but I can't find...
  8. Cooky

    PC User Name

    Is there a command which access the PC user name in Visual Basic?. I want to use it for the file name when generating reports created in VB Thanks for your help.
  9. Cooky

    Expansion Valve for R410A

    Can anyone suggest a manufacturer of an TEV that operates with R410A refrigerant. I need 4 valves with a capacity of about 10kW each, evaporating at +6 deg.C Any suggestions?
  10. Cooky

    MBA versus MSc, are they equal?

    Considering both MBA and MSc degrees are post graduate courses, I often wonder if they are of equal academic value. I am studying part time for a Master of Engineering degree in the UK, and will have completed 9 years study when I finish. From the same starting point, an MBA can be completed...
  11. Cooky

    Chilled water buffer vessel size

    Does anyone have an equation that will calculate the required volume for a chilled water buffer vessel? I use a 'rule of thumb' of 3 litres of fluid per kW of nett cooling, but I am after an equation that takes other variables into account. Such as number of chiller starts per hour, flow...
  12. Cooky

    Chilled water buffer vessel sizing

    Does anyone have an equation that will calculate the required volume for a chilled water buffer vessel? I use a 'rule of thumb' of 3 litres of fluid per kW of nett cooling, but I am after an equation that takes other variables into account. Such as number of chiller starts per hour, flow...
  13. Cooky

    Automatically running a macro

    When I run a particular Excel file, I want it to automatically run a macro on start-up. How can I do this? Thanks, Cooky
  14. Cooky

    Special Paste Question

    I have used the special paste function to take cell information from a file server in another city(it works across a WAN). What I need to do, is change the method of update from 'automatic' to 'manual'. Using Edit, Links..., I have opened a dialog box, but the 'manual update' button is greyed...
  15. Cooky

    Numbers on keyboard

    This may seem like an odd question.... Why are the numbers arranged differently on a computer keyboard, to those on a telephone or fax machine????

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