The installation of pipe loop
One drawback is that solar water heater hot water must be imported from outside or inside the top floor, a long waterway, pipeline usually accumulates a greater amount of cold water, the user can not immediately have an open hot water faucet out. To overcome this drawback, the use of pipeline loop is a common approach. Pipeline loop\\ s role is to replace the tank in the cold water pipe, hot water into the pipe, back into the cold water pipe in the solar tank, making in all hot water pipes, so users can get hot in time the. Figure 4-3-8 is the basic loop diagram.
The basic diagram of Figure 4-3-8 cycle
Now due to the development of solar technology, people invented the hot water loop controller, you can easily achieve the purpose of recycling. Recycling programs are generally used in three ways: manually cycle through the program, the timing cycle of timer control program, tap the control of real-time cycle options. As follows:
1, manual cycle program
Circulation pipe installation installed a circulating pump, when the user needs hot water, close the circulating pump switch, water pump will pump into the heat pipe solar water tanks, making the pipeline is full of hot water, so the user an open hot water tap, can quickly get hot water. Shown in Figure 4-3-9.
Figure 4-3-9 manual cycle diagram
2, the program cycle time
Figure 4-3-10 is an effective cycle timer is started by the waterways schematic:
Figure 4-3-10 start the cycle timer schematic
Principle Explanation: The program is controlled by the cycle timer cycle, when the user set the Timer 1 is turned on, open loop control solenoid valve 2, pipes in the water pressure is reduced to 1 kg, and the water signal to the pressure switch 3, the pressure switch because the pressure is less than the starting pressure (usually in the 2 kg) and connected, the pump 4 starts, down to pump water, so the cold water pipe to be squeezed into the solar tank. At this time, cycle time controller based on the user\\ s settings can delay a period of time, so that the pump continues to work to set the time, at which time the user opened the taps soon out of hot water.
Procurement cycle time controller street electrical stores are multi-time controller, a control generally have 10-16 hours, the user can set its own conditions to cycle time, more than 10 segments have sufficient time to set. Controller cycle time set in the cycle time, the average user turn on the tap, and soon you can get hot water.
3, real-time control loop program taps
Figure 4-3-11 is an effective waterway any tap from the start of the loop diagram:
Principles of explanation: When a user opens any water switch 5 (tap), the flow switch 3 opens, and the flow signal to the loop controller 1, 4 open loop controller will pump down the water pump, and solenoid valve open cycle 2, so the cold water pipe to be squeezed into the solar tank. At this time, the user closes the tap, loop controller based on the user\\ s settings can delay 20-160 seconds, set the pump to continue to work until the time, so cold water is pumped into the solar tank, so hang in charge of hot water are hot water, the user opens the tap water out quickly. At this time the hot water pipes will not immediately cools, it should wait until the cold water pipe in the loop again. Given this situation, the controller design cycle time interval of 30 minutes, during which the user turn on the tap, the solenoid valve 2 will not open, recycled water will not flow into the solar tank.
In general, household circumstances, few people with water, the water a long time interval, the time is also more irregular, more appropriate to start using the tap. In the collective environment, the water more time to focus on, such as factories, hotels, etc., were also more water in the water during the water is always water flow, the use of more appropriate time cycle.