What is the difference between Multi split unit and Variable refrigerant Flow units in air conditioning?

How should we calculate the quantity required to get a desired percentage of manganese while melting steel in an induction furnace?

If we have ferro SiMn having Mn %= 59,how much of SiMn should we add to the liquid metal of 20 MT?

What is the oxidation loss usually in Ferro SiMn say Grad

Dear sir,

Some winder said I have fitted magnetic wages in your motor slot please reply me magnetic wages made from which material.

how can v calculate cable size depending upon voltage drop

Hello there,

This is a great forum. Now, I am writing for some assistance!

I would like to know how to determine the specifications of a proposed UPS back up system. Specifically, I would like to know how to calculate how many batteries to use.

These are my details:

Hi CR4 Readers,

I wish to calculate the shear rate of an agitator impeller with the units of 'per second' (s^-1). Please advise a formula for this. The hydrofoil impeller is 1.76m diameter an running at 70rpm. I believe the answer should be around 4 s^-1 .

There also appears to be another

Can someone please tell me more about the alarms of a Deutz E11.4 genset? I am really interested and want to know what type of faults that cause the genset to cease.

I just got to know about this unsolved problem in newspaper.

I googled to find exactly what it is. but alas... I could not understand the problem!!

can you please explain the problem, what P implies and what is NP? and what exactly they want to find out?

Hi,

This may seem like a crazy question, but generally what is the difference between ddc and plc output/ input signals or does it just come down to individual models? Also can a part like a analogue temp sensor be interfaced with both ddc and plc units?

From Newlaunches.com:

We have seen a lot of Robots do well in the field of medical research as well as healthcare. We've seen robots that are sanitary-aware and also those who perform various manual tasks. But here's a robot who will totally leave you gaping at his awesomeness, wit

From Popular Science - New Technology, Science News, The Future Now:

After one failed attempt to remove a broken cooling pump on Saturday, a second attempt has succeeded. In a seven-and-a-half-hour spacewalk, Doug Wheelock and Tracy Caldwell Dyson managed to unhook the ammonia line

From Popular Science - New Technology, Science News, The Future Now:

Cryonic technology could help meet the world's peak energy demands as well as cut down on greenhouse gas emissions, a new study says. No, not by freezing excess humans -- by storing excess energy at sub-zero tempe

When I was driving my car the rpms where reving up and when I stopped there was smole on the driver side under the hood then when I drove it again my car would not shifit into any gears now when u push in the clutch and shift into any gear and let go of the clutch it does not die

Is S355J2G3 (European) steel "similar but better" than ASTM A516, Gr. 60 (USA)?

From TechCrunch:

Airplanes release greenhouse emissions into the atmosphere and require enormous amounts of fuel to fly. A Boeing 747 can consume up to five gallons of fuel per mile. But what if planes could be powered by electricity? Though they won't replace passenger airliners

I am in need of a small torsion Spring with the following specs :Dia.=1.75 to 2.00 in.max no of coils= 3 to4 , Rod or inside dia.= 1 3/8 in. , Deflection angle=180 degrees, wire dia.= 1/8th in. One leg= 3 to 4 in. the other = 1 to 2 in. , The long leg rotates attached to a 18 in Arm. the short leg i

Have a '98 Ford E250 van, 5.4 liter engine, dedicated CNG. What is the fuel pressure supposed to be? I have 90 lbs. at the fuel rail schrader. Vehicle will not start. Is this a fuel pressure problem?

Sure, most of the big show car debuts take place at the Detroit auto show these days, but the New York auto show is no slouch, especially with 110 years of history behind it. In June 1983, Audrey M. Snediker reviewed that history and showed us some of the more unique and eye-catching cars that

Is there any standard that describes the spacing between the supports in a piping?

From Technology Review RSS Feeds:

The 2011 Sonata Hybrid will be the first mass-market car to use the battery technology. In December, Hyundai will launch the 2011 Sonata Hybrid, the world's first mass-market hybrid with a lithium-ion battery pack. Lithium cells provide much highe