How Mizair Saves Energy
The MizAir® is an intelligent diaphragm pump controller using a programmable integrated circuit running a “fuzzy” logic algorithm to manage the compressed air consumption of an AODD pump. The MizAir consists of a NEMA 4x / IP65 housing, a control circuit, two three-way solenoid valves, an internal pressure sensor, and a pilot operated high flow valve.
The MizAir mounts directly to the diaphragm pump’s air supply port using simple plumbing like a pipe nipple. No modifications to the diaphragm pump are required. The MizAir requires 24VDC at low amperage to power its pump management circuitry and solenoid valves. No external controls or sensors are required.
AODD pumps are the right technology for pumping fluids with suspended solids, shear sensitive fluids, or other applications too difficult for traditional pump technologies. These advantages are often outweighed by the high energy costs associated with using compressed air driven pumps. Because a flexible diaphragm driven by compressed gas is used to displace an equal amount of fluid from the pump, every gallon of fluid discharged consumes a gallon of expensive compressed air. At the end of the pump stroke, the air chamber full of compressed, dried, filtered, regulated, and delivered air is ejected out of the pump’s exhaust port. What a waste!
The MizAir operates by supplying full supply pressure to the pump at the beginning of each pump stroke. This gives the pump all the force available to change direction, seat and unseat the internal check valves, and put the fluid being pumped into motion. The MizAir continues to provide high flow compressed gas into the diaphragm pump until the pump reaches, roughly, mid stroke. At that point, the MizAir closes and shuts off the supply of compressed air to the pump. The air already in the pump is now trapped. However, this air continues to expand by pushing against the diaphragm and allows the pump to finish out the stroke. At the end of the pump’s stroke there is about one half the pressure remaining to be exhausted. Half the pressure for the same internal pump volume means that 50% of the air is used with the MizAir than without.
Additional benefits are also realized. Less air to exhaust means that there is less initial resistance to the new stroke direction from residual air pressure in the previous air diaphragm chamber. This factor also increases the pump efficiency. Less exhaust air also reduces the noise level of the pump.
The MizAir uses a programmable integrated circuit (PIC) running a proprietary software program which utilizes Fuzzy Logic™. The software watches various pump operating parameters like pump speed, supply air pressure, and pump discharge pressure. The MizAir uses this information to make decisions about when to provide air to the pump as well as how much air to provide to the pump. The MizAir recalculates and makes a new decision every time pump makes a stroke.
Most of this information is derived form the on-board pressure transducer mounted inside the MizAir. This pressure between the output of the MizAir and the input port of the diaphragm pump. As the MizAir opens and closes this air pressure displays a profile which reveals many of the pumps operating. The MizAir software uses this pressure profile to learn the unique characteristics of each pump and make the required changes to the air supplies to the pump. No external sensor inputs are required to be connected to the MizAir and no modifications to the pump are required. This is How MizAir Saves!