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Correct application of side mounted magnetic flap level gauge in domestic hot water recycling

Time: 10:40:49, July 3, 2019 source: Author:
The side mounted magnetic flap level gauge is an essential part of almost any domestic hot water system served by a high pressure domestic water main. In this blog, we will discuss how to properly apply the side mounted magnetic flap level gauge so that these "necessary components" do not become a necessary drawback for water service problems and huge energy losses to owners.
Never recirculated by side mounted magnetic flap level gauge!
The side mounted magnetic flap level gauge is used to reduce high pressure domestic water to a more moderate pressure suitable for domestic water service. A typical domestic water system requires about 25 pounds of pressure. (less pressure required to flush a regular toilet) and 80 lbs. (higher pressure allowed by piping code). For shower service, sink service, etc., it is better to keep the pressure below 60 pounds to ensure human comfort and the overall function, efficiency and durability of the system. ?
This presents some challenges to the recirculation system used in high-rise buildings - mainly how to avoid passing through the side mounted magnetic flap level gauge (bad!) Recycle hot water while maintaining pressure to suit all floors.
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Please pay attention to the pressure gauge readings at various points in the building. Water enters at 120 pounds, passes through a water heater and is lifted up. The flow is divided into 10 floors near the top floor. On the 10th floor and below, the water pressure is 70 pounds. -Shower service is too high, so install Installation of magnetic level gauge Absorb 50 pounds. Pressure is reduced to the lower floor of the service water to 20 pounds. Meanwhile, the first 10 floors of the building were repaired with the remaining 70 pounds. The pressure reaches the last clamp of 20 lbs. Pressure. ?
Everything will be fine except that this is a circulatory system, and when the recirculation flow from the first 10 layers meets the flow from the lower 10 layers, the latter experiences some obstacles in the pipeline. We have 70 pounds now. The pressure water tried to flow into 118 pounds. Pressure water. Because there's no way to 70 pounds. It can flow in 118 pounds, and only the first 10 floors of the building can be recycled. As a result, the lower 10 floors lack hot water recirculation! Hotel guests will have to pour water into the drain until the open fixtures generate enough demand to get hot water from the hot water supply body.
A bigger pump is not a good answer
A quick (but costly) solution to this problem is to add a balancing valve to the recirculation line that flows down from the top floor, slowing the flow on these floors and lowering the pressure from 118 pounds. To 68 pounds This is just enough to drop the pressure in the circuit to allow the return from the lower level to enter the recirculation circuit and return to the pump. ??
But that raises another problem. The suction pressure is only 68 pounds. On the pump, we need a higher pump head to raise the pressure to more than 120 pounds. Water heater requirements. In fact, we need one pump (or two pumps in series) that can deliver a head of 122 feet at 6 gpm. This increases a lot of additional energy consumption during the life of the system. ?
Create a separate pressure zone!
A better solution is to create separate pressure zones every seven to eight floors, each with its own pump and water heater. Obviously, if the original design was more like the one we saw in Figure 1, this may not be an option, but it is the way most hotels (and other similar high-rise buildings) are designed today. It works.
Note that the recirculation loops at the upper and lower parts of the building now operate independently of each other and do not have to be pumped through the side mounted magnetic flap level gauge. Instead, a side mounted magnetic flap level gauge is installed between the cold water supply and the lower level recirculation circuit. It continues to work to reduce street water pressure into buildings as needed, but it does not affect the return pressure in any way. Because of the static height, the upper floor which does not need decompression operates independently. The lower level can obtain the required decompression with the help of a side mounted magnetic flap level gauge, but the circulation loop does not have to cross it. ?
Of course, this is a very simplified example. Our video on domestic hot water recirculation with pressure relief valves shows more detailed examples of piping arrangements based on the creation of separate pressure zones. ?