 | Recent Questions & Answers | |
| "Earth" Temperature Just Below Frost Line |
| By Anonymous Poster in General Discussion |
If the temperature below frost line is "heating" during winter and "cooling" in summer, why isn't that concept used in home building? Does "geothermal" have to mean pipes and pumps installed below frost line, and full of fluid? (which is pretty expensive). |
| RTD Checks Procedures |
| By Noor in Instrumentation |
Hi, If RTD is installed in electric motor but I have doubt if the sensor is working fine and is malfunctioning, RTD is impeded within motor circuit. How to determine if is working fine and what is the Ohms should measures if motor is down? |
| GE DC300 Puzzle |
| By badhabitrabbit in Mechanical Engineering |
Morning all, We have a GE DC 300 drive used for variable spindle speeds on a horizontal lathe with a two speed headstock controlled by a Fanuc 18TB cnc control. On the drive there are only two parameters that I'm aware of for selecting the ACELT & DCELT time. Parameters 057 & 058. To preven ...more |
| Methane Fuel Cells |
| By Ron Davison in Sustainable Engineering |
How can I commercially clean up hydrogen sulfide from useful methane from a "stripper" oil/gas well? Where can I buy large (1 MegaWatt+) methane fuel cells? |
| When Did You Get Indoor Plumbing? |
| By ddk in General Discussion |
I've been following kramarat thread on A World Without Oil Some of the comments about living off the grid got me to wondering when people got "modern" conviences. I know the farmhouse I was raised in didn't get indoor plumbing until after I was born. Probably 1955-57 time period. My wife grew up ... more |
| Facebook and Twitter: Useful Engineering Tools? |
| posted in Motors Blog |
It seems like everyone is talking about Facebook and Twitter these days. These social networking tools are certainly fun. But can they serve more serious purposes as well, especially for the engineer? If you're using Facebook or Twitter for any work-related purpose, please tell us about what you're ... more |
| Shifting Gears: Driving with the Sun |
| posted in Alternative & Renewable Energy Blog |
A Do the Math blog post analyzes prospects for the solar-powered car, concluding that 100% on-board solar or battery/roof-mounted PV solutions are not technically or economically feasible. More practical are stand-alone PV and grid-tied PV options for charging EVs. Do you think that solar-powered au ... more |
| U.S. Energy Revolution Blueprint |
| posted in Alternative & Renewable Energy Blog |
To save the national economy hundreds of billions of dollars per year by 2050, the U.S. government should invest a few billion dollars more annually to foster energy technology innovations. This major recommendation from a three-year Harvard Kennedy School study argues that doubling energy RD&D ... more |
| Changing Antifreeze |
| By ronwagn in Chemical & Material Science |
I never change my antifreeze, and have never had a problem. I have always thought that it as long as it was the right concentration, and clean it was OK. What is really needed for good maintenance? A lot of money is spent, or possibly wasted, changing antifreeze or coolant. It is also a pollutant an ...more |
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