Am eternal science student & like role as science communicator. I wish more practical expert would take the time to familiarize the public with their field of study. I wish this because I understand that just because I know something doesn’t mean everyone else knows it too. I was once ignorant of the concept of “evolution theory” and it was because someone took the time to explain it to me that I understand it now. How did you learn it?
Pseudo Science & technology are designed trap people in darkness of delusion & ignorance. Not money or anything but ONLY KNOWLDEDGE makes us free.
Showy architecture is somewhat subjective matter but showy technology which actually pseudo technology is pure commercial cheating matter of quack . Not only illiterate but literate also get deceived on big technical name like hydro pneumatic,VFD etc. etc. ,there is no objection to technology but the way it is misused is really objectionable . Such science & technology are not subject to verification or falsification on the ground of experience and facts which is hazardous to society. In this series I will explore such examples in science & technology obviously which is welcome to debate in written form.
Many government agencies, electric utility companies, engineers, manufacturers, suppliers, and installers are either part of the scam, or just caught up in the lies themselves.
Government agencies and power utilities want you to believe they are trying to help you save energy and money. Manufacturers, suppliers, and even some installers wish to sell you equipment that cost a lot and doesn’t last very long. Many engineers want to vary the speed of the pump because it is easier, or they don’t know how to properly design and size a pump system. Make no mistake about it, most are lying about VFD’s to line their own pockets Although these are the real reasons for the documented energy savings.
1) Hydro Pneumatic or pressure booster pumping system- In 2005 ,we used hydro pneumatic in 8 storied luxury residential scheme in Viman Nagar in Pune.In 2008 we got a call from the management committee of to help them on their very high electricity bills.(same case in Mumbai also) Surprisingly their common electricity bills were so high that their monthly maintenance bills were as high as what a family would pay as rent in any other society in the city. On a walk through audit we found that although the lighting used in the scheme was most efficient, what was causing high electricity bills was the hydro-pneumatic pumping system that was installed in the building.Thanks we provide them Over head tank & by stopping use of system all is well now.Though by using hydro pneumatic system you can completely side line OHWT means we can use only Underground tank for complete water system.
The intent of this article is to explain the differences between hydro pneumatic and a regular gravity based pumping system and also to alert the buyers of a new flat to check the same to prevent high electricity bills. This actually written by many
What is a Hydro Pneumatic or pressure booster pumping system?
A hydro-pneumatic pumping system has a ground level storage tank instead of an overhead storage tank. Pressure sensors are installed at various parts of the plumbing in a building that make sure that there is a constant pressure of water everywhere. Whenever a sensor senses that the pressure is low, the pump close to the ground level storage tank starts and pushes the water up to the level where it is required. It maintains the same pressure everywhere.
What is traditional gravity based storage system?
Traditionally most high-rise buildings have a water storage tank at the top. Pumps installed at the bottom of the building push the water to the overhead tank. The pumps are run for a few hours a day to ensure that the water is adequate in the overhead tank. If right size pump is used for a given load the pumps can run close to the best efficiency point during the time of operation. The distribution of water from the overhead tank to the houses happens though gravity (or the weight of water) and there is no electricity required for the same.
Challenges with a Hydro-Pneumatic pumping system
At a high level a hydro pneumatic system looks neat and sophisticated but the problem is with the efficiency of the system. In the building we evaluated, every time anyone opened a tap for water or used water in the bathroom, the pumps got switched on. We observed that it started and stopped almost every 2 seconds. Any pump takes higher current to start up (6 to 7 times more than stable operation) and since the pumps were starting very frequently, the electricity consumption was very high. Extra energy is also required to achieve constant pressure across the building. (source: energy manager training)
The other drawback of such a system is that it will not work in places where there are frequent power cuts. Although there are pros and cons of both the systems as listed on this link: wiki answers, from an energy efficiency perspective, a hydro pneumatic system is just too expensive to operate. The owners of the flats in the building we visited do not have any other option now but to operate it as it is. But had they known about it earlier, they would have probably made a different decision.
2) Variable Speed Pumps (VFD’s) are BIG Scam.
Variable speed well pumps, booster pumps, and pool pumps are a scam. These pumps use computerized controllers, also known as Variable Frequency Drives or VFD’s.
These Variable Speed type pumps do not save energy, and do not make pumps last longer. To the contrary, varying the speed of these type pumps can increase the energy used by as much as 500% per gallon produced. Likewise, varying the speed increases the heat in motors, causes excessive vibration, and shortens the life of motors from other undue stresses.
So how do these people get away with lying? As they say, the. Read the fine print carefully. Comparing a VFD to the most inefficient pump system possible is the usual way to show it saves energy. Many articles will barely mention discontinuing the use of a dump valve, lowering the pressure required, or even installing a smaller pump in the system. the VFD added to the big pump wrongfully gets all the credit.
So called “energy saving calculators”, especially for pool pumps, will not allow you to simulate turning the pump off. A pool pump only needs to run 6 to 8 hours a day. If you can’t turn the pump off, of course a VFD is going to show Rs.1,00,000 a year savings. But slowing the pump down with a VFD is not doing any good. At really low flow rates the skimmers don’t skim, the vacuum won’t vacuum, and the filter won’t filter. Turning a standard pump off with a timer, instead of letting a VFD run it slowly all day, WILL save thousands of dollars a year.
Other so called “energy saving calculators” won’t let you put in the head or pressure required. This way they can show tremendous energy savings when the pump speed is reduced by 90%. However, because the pump still has to produce head or pressure, the pump can only be slowed by 10%, which actually makes the pump use more energy than a properly sized pump without a VFD.
Still others will make a big deal about how the motor amps are reduced as the RPM is reduced with a VFD. However, they conveniently forget to mention that the flow is reduced 5 times faster than the amps, which makes the VFD cause 500% more energy use per gallon.
The Cycle Stop Valve is a good alternative to a VFD or big pressure tank. However, the pump industry will do anything they can to dissuade you from using a CSV. The CSV is a disruptive product. It really does make pumps last longer and use smaller pressure tanks. The CSV really does eliminate cycling and water hammer. The CSV really does save you money, which is why it is disruptive to the pump industry.
Don’t let a fast talking salesperson force you into a money pit. Don’t let an electric utility pay you an incentive to install a VFD. It will cost you many times that amount in frequent equipment (VFD/motor) replacement.
Finally if we are impressed only by the answers sounding scientific and do not appreciate that science is a careful process of rigorous investigation, if we label intellectual due diligence as rude or an attack, then we are not in any position to receive what science has to offer. We gain only an illusory grasp of nature, and destine ourselves to remain ignorant of our ignorance..