15/02/2013

Hi 2028 Vision for Mechanical Engineering!.

Hi 2028 Vision for Mechanical Engineering!.

A 'Hi' 2028 VISION CALLS MECHANICAL ENGINEERING TO GRAND CHALLENGES AND GREAT CONTRIBUTIONS!.


"Mechanical engineering will develop engineering solutions that foster a cleaner, healthier, safer and sustainable world"

CONTENTS:

Executive Summary ............................................................................................................. 1

A 2028 Vision Calls Mechanical Engineering to Grand Challenges
and Great Contributions ................................................................................................ 2-3

Critical Choices on the Path to the 2028 Vision ................................................................. 4

Preparing for the Critical Uncertainties Ahead
for Mechanical Engineering .............................................................................................. 5

Anticipating the Grand Challenges
and 2028 World of Mechanical Engineering ............................................................... 6-12

Next Steps to a 2028 Preferred Future ............................................................................ 13

A Global Process for Engaging in Defining Our Preferred Future .............................. 14-15

End Notes ..................................................................................................................... 16-21



(Hi) - The Great Divide!.

(Hi) - The Great Divide!.


Contrast

In my opinion, Infrastructural rebuilding of a vastly underdeveloped economy in the middle east in parts of the region is to be hailed as the foundation of wealth and gain for communicating new ideas between regions that heavily rely on other providers for global resource stabilization & security those known as market leaders in maintaining key role for the responsible actions required for the success of the global economy .

A developed economy will benefit greatly from areas that out weigh there physical capabilities to maintain there own productive and self sustainable economies through there own resources therefore requiring an intervention of foreign planning to prevent the further collapse in the region. A foreign entry into the region will greatly benefit by outsourcing the demands of its own capabilities for its own services on a local and international scale.

The trick in my point of view is for adaption and not change in the cycle of the current process by the troubled regions. If part of the middle east region reconstruction can begin to become more receptive to ideas that foreign beneficiaries have themselves adapted and communicated to expand the liability of the region and therefore its counterparts success accelerating growth on a adaption basis internationally with the outlined regulatory bodies monitoring this process to maintain a medium balance between what is thought out to be a future sustainable outcome versus self sustainability of the region.

A future sustainable outcome can and will only focus on self driven economic interests of maintaining its own economical growth by benefiting other economies at the expense of its own economical growth ultimately resulting in slowdown or economic downfall and the rise of another. As each region is driven by key unique success in my view local economies should be the sole beneficial reason for its own key role and responsible allowing themselves to establish key competition with other growing economies by adapting to key inter dependable communication with ownership of their own key input capabilities & methods .

- "In summary, Lets take responsibility of what we have, instead of what we can do"


By Rami Hammam

10/02/2013

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Hi Green Tip #4: Hi Size and Select Fans Near Their Peak Total Efficiency.

Even the most efficient fan models can operate inefficiently if improperly sized.Fans selected close to their peak total efficiency (pTE) will use less energy. The 2012 International Green Construction Code requires selections within 10% of peak efficiency, and ASHRAE Standard 90.1,

Energy Standard for Buildings Except Low-Rise Residential Buildings, is considering language that would require a 15% allowable range. If a fan is selected to operate more than 15 point below its peak efficiency, it is probably undersized to result in the lowest purchase price (first cost). The smaller, less-expense fan will have to run much faster with higher levels of internal turbulence than its larger cousin to meet the required air flow, thus consuming a lot more energy.The cost difference to select a larger fan closer to peak operating efficiency is very small when compared to the energy saved.

Simple payback for 10% selections is usually less than one year. Smaller fans operating faster will also require more maintenance and earlier replacement. Smaller fans generate more noise as well.Below is a table showing the output from a fan manufacturer's sizing and selection program. All of the fans in the table would "do the job" of providing the required airflow at the required pressure.

The fan sizes range from 18-inches in diameter to 36-in. Notice that as the fan diameter increases, the fan speed decreases, as does the fan power (expressed as "brake horsepower"). The red region of the table indicates poor fan selection practice - none of these fans have an actual total efficiency (at the airflow and pressure required) within 15 points of peak total efficiency. The green region indicates proper fan selection process - all have an actual total efficiency within 15 points of peak total efficiency.

Note that the 30-in. diameter fan consumes roughly half the power of the 18-in. fan. The lowest cost fan shown is probably the 20-in. fan, with an efficiency of 49%, 29 points off the peak. If this fan runs 6,000 hours per year at a utility rate of 10 cents per kwh, it will cost $4,300 a year to operate. A more efficient selection might be the 24-in. fan because it is "Class I" and complies with both ASHRAE 90.1 and the Green code requirements. It has an actual efficiency of 69%, 10 points less than the peak efficiency of 79%. This fan would cost $3,100 to operate, which is probably more than the fan itself costs. A more efficient 30 inch selection is only 1 point from its peak efficiency of 83% and will consume only $2,600 per year, saving $500 a year relative to a 24-in. fan, and $1,700 a year over the lowest cost fan. Generally, the difference in initial cost of the most efficient fan selection is paid back in less than 5 years over more common less efficient alternatives. Perhaps this observation will bring it home.

Most fans consume more each year in energy cost than they are worth. So, when you buy a fan, think of it as a liability, not an asset. Your objective should be to make the liability placed on those who will pay future energy bills as low as possible. The leverage implicit in choosing a larger, more efficient fan is much greater than most people appreciate. And fans last a long time – 20 years plus – so choose wisely.The bottom line is this. Right-sizing a fan can yield energy savings and generate a lot of operating cost savings for the facility owner or occupants for many, many years.

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