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Better Pump Efficiency

ဥပမာ ၁

Chilled Water System တစ္ခုတြင္တပ္ဆင္ထာေသာ Chilled Water Pump A ၏ Flow rate မွာ 80 L/s ၿဖစ္ၿပီး head မွာ 150 kN/m2 ၿဖစ္သည္။ ထို pump A ၏ efficiency မွာ 78% ၿဖစ္သည္။ အကယ္၍ ထို pump ကို 90 percent efficiency ရွိေသာ အၿခား pump B ၿဖင့္ ေၿပာင္းလဲတပ္ဆင္လုိက္လွ်င္ pump power မည္မွ်သက္သာသြားမည္နည္း။

 

 

 

 

ဥပမာ၂

Capacity တူညီေသာ Chiller ႏွစ္လံုး A ႏွင့္ B တုိ့ ၏ Data မ်ားအားလံုးမွာ Pressure Drop Across မွ လြဲ၍တူညီၾကသည္။

Chiller A ၏ Pressure Drop Across မွာ 30 ft of water ၿဖစ္ၿပီး Chiller B ၏ Pressure Drop Across မွာ 10 ft of water ၿဖစ္သည္။ ထုိ Chiller B ကို ေရႊးခ်ယ္ၿခင္းေၾကာင့္ သက္သာေသာ power ကို ရွာပါ။

 

ေမးခြန္းမ်ား

ေမးခြန္း (၁) A pump တစ္လံုးသည္ 1200 rpm ႏွင့္ေမာင္းေနသည္အခုိက္ 200 L/s ကို တြန္းပို့နိုင္ၿပီး 45 kW လုိအပ္သည္။ ထုိ pump speed သည္ 1100 rpm အထိ ေလ်ာ့က်ခဲ့လွ်င္ new flow rate and power consumption ကို တြက္ၿပပါ။

ေမးခြန္း (၂) A pump တစ္လံုးသည္ 1200 rpm ႏွင့္ေမာင္းေနသည္အခုိက္ 200 L/s ကို တြန္းပို့နိုင္ၿပီး သည္။ သုိ့ေသာ္ တစ္ခ်ိဳ ့ေသာအခ်ိန္တြင္ (actual operating conditions) water flow မွာ 35 L/s ၿဖစ္ၿပီး the pump
motor သည္ 25 kW ကို သံုးစြဲသည္။ What will the reduction in pump power consumptionbe if the pump speed is reduced to provide the design water flow of 20 L/s?

 

ေမးခြန္း (၃) The condensers of two different chillers of equal capacity have pressure
drops of 80 kN/m2 and 40 kN/m2, respectively. If the water flow rate
required is 150 L/s, calculate the saving in pump power for the condenser
water pump if the chiller with the lower pressure drop is used instead of
the chiller with the higher pressure drop.

 

ေမးခြန္း (၄)A pumping system တစ္ခုသည္40 L/s ႏွင့္ a head of 120 kN/m2 လုိအပ္သည္။ ထုိ pump ၏ efficiency မွာ 65 % ၿဖစ္သည္။ 65 % efficiency ရွိေသာ pump ကို 85% ရွိေသာ pump ၿဖင့္ေၿပာင္းလဲတပ္ဆင္လုိက္လွ်င္ power မည္မွ် သက္သာမည္နည္း။

 

 

Pump ႏွင့္သက္ဆုိင္ေသာ ACMV Lecture မ်ား (7 Lectures)
1 Pumping System Type of Pumps Read
2 Pumping System Pump Head Calculation Read
3 Pumping System Pump Curves Read
4 Pumping System Pump Calculation Examples 1 Read
5 Pumping System Pump Calculation Examples 2 Read
6 Pumping System Understanding of Pump Head Read
7 Chilled Water Pump and Condenser Water Pump Power Pumping Power Calculation Read
   

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