" But when along train of abuses and usurpations, pursing inviably the same object, evinces a design to reduce them under absolute despotism , it is their right, it is their duty to throw of such their goverment and provide new guards for their fucture security."

ေမာ္တာ၏ စြမ္းရည္ တြက္နည္း

Energy Saving from Motor Efficiency
Chilled Water pump အတြက္ အသံုးၿပဳေသာ ၿမင္းေကာင္ေရ ၂၅ေကာင္အား (18.7kW) လွ်ပ္စစ္ေမာ္တာတစ္လံုးသည္ 88% efficiency (Standard Efficiency) ရွိၿပီး တစ္ေန့လွ်င္ ၁၂ နာရီေမာင္းႏွင္သည္။ တစ္ႏွစ္လွ်င္ ၃၆၅ရက္လံုးေမာင္းနွင္လွ်င္ ထုိ လွ်ပ္စစ္ေမာ္တာအား 93% efficiency (Premium Efficiency) ရွိေသာ ေမာ္တာ အသစ္ၿဖင့္ေၿပာင္းလဲတပ္ဆင္လုိက္လွ်င္ တစ္ႏွစ္လွ်င္ ေငြမည္မွ် သက္သာမည္နည္း။ Chilled Water pump ၏ ေမာ္တာမ်ားသည္ Full load ၿဖင့္ အခ်ိန္တုိင္းတြင္ေမာင္းႏွင္ေနဟုယူဆပါ။
ေမာ္တာအသစ္၏တန္ဘုိးမွာ $3000 ၿဖစ္ၿပီး လွ်ပ္စစ္ဓါတ္အားခမွာ $0.15/kWh ၿဖစ္လွ်င္ လေပါင္းမည္မွ်ၾကာလွ်င္ ေမာ္တာအတြက္ကုန္က်ေငြၿပန္လည္ရွိနုိင္မည္နည္း။ Simple Pay Back Period နည္ၿဖင္းတြက္ခ်က္ပါ။

Existing motor
88% efficiency ရွိေသာ ေမာ္တာအေဟာင္း ၏ Input Electrical Power မွာ 21.25kWe ၿဖစ္သည္။
Input Electrical Power for 18.7kW with 88% efficiency = 18.7 / 0.88 = 21.25kWe (input Electrical power)
New motor
93% efficiency ရွိေသာ ေမာ္တာအေဟာင္း ၏ Input Electrical Power မွာ 20.1kWe ၿဖစ္သည္။
Input Electrical Power for 18.7kW with 93% efficiency = 18.7 / 0.93 = 20.1kW (input Electrical power)
ေမာ္တာအသစ္ေၾကာင့္ သက္သာေသာ  kW မွာ 1.14 kW ၿဖစ္သည္။
Saving kW per hour = 21.25kW - 20.1kW = 1.14 kWh

တႏွစ္အတြက္ 4,993.2kWh သက္သာသည္။
For one year kWh saving = 1.14 kWh x 12 hr per day x 365 days = 4,993.2kWh

တႏွစ္အတြက္ $749 သက္သာသည္။
For one year $ saving = 4993.2kW x $0.15/kWh = $749
Simple Pay back period = $3000 / $749 = 4 years ( 48 months)
ေလးႏွစ္ၾကာလွ်င္ ေမာ္တာအသစ္၏ ကုန္က်စရိတ္ 3000$ ၿပန္လည္ရရွိနုိင္သည္။
ေမာ္တာတစ္လံုး၏ Efficiency ကို သိရန္ နည္းလမ္းမ်ား
က) Motor Name Plate မွ ရယူနုိင္သည္။
ခ) Motor Manufacturer မွ ရယူနုိင္သည္။
ဂ) Published Data (NEMA) မွ ရယူနုိင္သည္။
ဃ) တုိင္းတာၿခင္းၿဖင့္(Measurement ) ရယူနုိင္သည္။
Input Electrical power တုိင္းယူနုိင္သည္။ Output Mechnical power ကို Torque ႏွင့္ Speed ကို တုိက္ရုိက္တုိင္းယူၿခင္း သို့ indirect by subtracting losses မွ လည္း ရရွိနုိင္သည္။
ေကာင္းထက္ညြန့္

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