Difference between variable frequency constant pressure water supply and zero-pressure variable frequency water supply systems

A variable frequency constant pressure water supply system refers to a water supply method in which the outlet pressure remains unchanged when the water consumption in the water supply network changes. Variable frequency constant pressure water supply equipment mainly consists of pump units, pressure stabilizing tanks, pressure sensors, variable frequency control cabinets, stainless steel water tanks, etc. When the variable frequency constant pressure water supply is used, the municipal pipeline network is connected to the stainless steel water tank in the pump room. After the municipal tap water enters the stainless steel water tank, it becomes static water with zero pressure. When users have water demand, the variable frequency pump automatically starts to supply water, supplying as much water as needed. II. Waterless variable frequency water supply system The waterless variable frequency water supply system is a water supply equipment in which the water inlet pipe is directly connected to the tap water network. Under the drive of the remaining pressure in the tap water network, the water is pressed into the equipment's water inlet pipe. On the basis of the remaining inlet pressure, the pressure boosting pump of the equipment continues to increase the pressure, increasing the water supply pressure to the pressure required by the user before supplying water to the outlet water network. Waterless variable frequency water supply equipment mainly consists of water pumps, intelligent variable frequency control cabinets, waterless devices, pressure boosting devices, water diversion devices, and pressure stabilizing tanks; when the waterless variable frequency water supply is used, when the remaining pressure of the tap water network meets the user's water supply requirements, the equipment automatically enters the sleep state, and the tap water network directly supplies water to the user. When the water supply is insufficient, the equipment automatically resumes operation. III. Comparison of variable frequency constant pressure water supply and waterless variable frequency water supply 1. When the municipal water supply pressure is stable and the water volume is sufficient: Waterless variable frequency water supply can fully exert its advantages, and its energy-saving effect is superior to ordinary variable frequency constant pressure water supply; the cost of the equipment is also lower than that of ordinary variable frequency constant pressure water supply. 2. When the municipal water supply pressure is unstable and the water volume is insufficient: Waterless variable frequency water supply equipment needs to add a water tank as a backup water source, and the equipment cost is higher than that of ordinary variable frequency constant pressure water supply equipment; the energy-saving effect is not obvious; 3. Taking Olive City as an example: The water pressure of the municipal water supply network in Kaifeng urban area is unstable, and the water pressure for domestic water use is too low. Under such conditions, if waterless water supply equipment is used, a water tank must be added as a backup water source; on the other hand, there are many residents in the north and south districts of Olive City, and it is concentrated. During peak water consumption periods, it is difficult for waterless equipment to directly obtain water from the municipal pipeline network to meet the water demand, and a water tank must be added to use variable frequency constant pressure water supply. If the municipal water supply conditions in Kaifeng urban area can be greatly improved in the next few years, the use of waterless variable frequency water supply equipment can be considered. The equipment cost will be higher, but when residents use water in different time periods, the advantages of waterless variable frequency water supply will be reflected, and the energy-saving effect will be fully achieved!