نقاش مضخات البوستر مع vfd هل هي موفرة للطاقة و مجدية فعلاً ؟

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عضو نشط
إنضم
10 أغسطس 2008
المشاركات
359
مجموع الإعجابات
31
النقاط
28
السلام عليكم
آمل الإدلاء بخبراتكم القيمة بخصوص مغير سرعة المضخات و هو VFD أو VSD و مدى جدواه في حالات الضخ المباشر على المباني و في حالة الضخ إلى خزانات علوية (ما يسمى Lift Pumps) . و هل له دور في تقليل حجم خزانات الضغط المصاحبة للمضخات .المعروف أن سعر لوحة المضخة يزيد بصورة ملحوظة بناءا على إضافة هذه القطعة و لذا يجب دراسة جدواها من عدمه قبل إدراجها في مواصفة أي مشروع .
و دمتم بكل ود
 

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عضو نشط
إنضم
10 أغسطس 2008
المشاركات
359
مجموع الإعجابات
31
النقاط
28
Are Variable Frequency Drives or Constant Pressure pump systems a
way to save energy? Are they "greener"?
Variable Frequency Drives are a type of controller that allow a pump to be run and the exact speed
necessary to produce the exact amount of flow/pressure required. These devices are commonly
marketed as energy saving devices and, in some select applications may provide some small energy
savings. These systems are typically more expensive and more complicated, but do offer some very nice
features that can include reduced pump noise, reducing water hammer/surge, extended pump life, &
constant water pressure.
The primary reason that VFD’s don’t provide energy savings is the parasitic energy losses inherent in the
technology that involves rectifying the AC voltage from the grid and then re-inverting it to the correct
voltage/frequency for the motor’s reduced speed.
In side by side bench tests that were conducted for over a week on a conventional pressure
switch/pressure tank type system as compared with a VFD system using the same exact pump & motor,
with the same exact varying flow rates and volumes resulted in a net zero energy savings.
“Constant” pressure is a bit of a misnomer as these systems do hunt a bit, but not nearly as much as
pressure switch type systems. For the most part, most people simply cannot physically tell the difference
between a constant pressure and traditional type system at the faucet/in the shower or at the hose-bib
in the garden.
Applications where variable frequency drives are rarely called for include systems where a pump directly
fills a storage tank, pond or other vessel and the flow rate/pressure is not important at all.
Variable Frequency Drives are really not any more or less green than the alternative system unless they
can significantly reduce the quantity of pressure tanks required. Typical pressure switch controlled
systems require enough volume (supplied by pressure tanks) in the system so that the pump cycle time
does not exceed manufacturer specifications. A VFD can typically reduce this requirement to one
medium/small sized pressure tank. On large systems the savings in pressure tanks can easily pay for the
additional costs associated with using a Variable Frequency Drive and reduce the physical/carbon
footprint of the equipment necessary for installation.
 
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