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. CountZero

    MIG weld low carbon steel to stainless steel tubing

    Thanks guys. That's what I thought. My instincts went in that direction. The reason I questioned it is because a couple techs said it couldn't be done, but I didn't fully believe them. You made my day. Cheers and stars to you.
  2. CountZero

    MIG weld low carbon steel to stainless steel tubing

    Hello All, this is a rather rudimentary question, but I wanted to know if it's possible to MIG weld low carbon steel to stainless steel tubing, and why? My instincts say not under normal conditions because of their different compositions, but I'm willing to try it anyhow. If anyone has any...
  3. CountZero

    need better method of determining solar irradiation

    Thanks for your replies. 25362, that book is pretty good. I have another called gieck and gieck (or geek and geek). tunalover, basically I have a 1.2m parabolic dish and I'm trying to determine what the maximum useful energy can be extracted from this device. It's like a 2nd law efficiency...
  4. CountZero

    solar Radiation on an object

    Well, the first 3 will not be effected. i.e. Rayleigh scattering, aerosol extinction, and ozone absorption since they are mostly effected above the 6000 ft elevation you described. However, because of reduced pressure at that higher elevation, you should see a decrease in the amount of water...
  5. CountZero

    solar Radiation on an object

    1000 W/m^2 would be a gross assumption. No, at max, there is 700 W/m^2 at the surface of the earth. In outer space, just above the earth's atmosphere the solar flux is 1367 +/- 2- W/m^2. There are 5 major factors which reduce solar flux. Rayleigh scattering, aersol extinction, ozone...
  6. CountZero

    need better method of determining solar irradiation

    Hello, I was wondering if anyone knows of a better way to determine the solar irradiation, at the Earth's surface, than with using ASHRAE's ClearSky Model, which uses a Cn constant to approximate the solar flux? If you know of any, and are almost as simple to use as the ASHRAE model, I would...
  7. CountZero

    Heat Exchanger Efficiency

    Efficieny in this instance would be the 2nd law efficiency: that is the total amount of energy transfered divided by the total possible heat that could be transfered. From there you could determine how effective your h.e. design is and how much more this design could be improved. I hope that...
  8. CountZero

    Searching for supplier that sells mircoturbines (*micro-braytoncycle

    What do you mean by conventional means? Photovoltaic? I want to use a micro engine because I want to determine the efficiency of converting solar thermal into useful electrical energy. Apparently, a solar stirling system can have efficiencies of ~40%, whereas a PV is ~10-18% efficient.
  9. CountZero

    Searching for supplier that sells mircoturbines (*micro-braytoncycle

    I have a problem finding a supplier that sells microturbines (i.e. brayton or rankine cycle) or even a stirling engine that can withstand high temperatures (i.e. T > 300 deg C). This engine is to be used in estimating the solar thermal flux impinging on a 3-d parabolic collector. This engine...

Part and Inventory Search

Back
Top