In the process of mixing and discharging the hot water flowing out of the solar water heater and the cold water flowing out of the tap water pipe, since the ordinary mechanical type water mixing valve has physical defects, the final water temperature is not easy to adjust, and cannot be stabilized after the adjustment, and is re-adjusted after the interruption. In response to this problem, this project hopes to design a digital mixing valve that can automatically adjust, stabilize the water and maintain a constant water temperature through the PIC32 single-chip microcomputer, which makes the use of the solar water heater more convenient and comfortable, and at the same time reduces the waste of water resources. This project has high application value and good market potential.
At present, under the great environment of the country's vigorous development of new energy sources, the development and utilization of water, solar energy and biomass energy have received special attention. In these fields, solar water heaters are a major industry in the application of solar energy. They have quickly won the favor of consumers with the advantages of environmental protection, safety, energy saving and sanitation.
The "Eleventh Five-Year Plan for Renewable Energy Development" released on March 18, 2008 clearly stated that by 2010, the cumulative installed capacity of solar water heaters will reach 150 million square meters. In addition, in the construction of new rural areas, many places have given different levels of subsidies. Each solar water heater is subsidized by a thousand yuan, or as little as one or two hundred yuan. It can be seen that the future development prospects of solar water heaters are very good.
Since the rapid development of the solar thermal utilization industry from 2001 to 2006, the sales of solar water heaters have increased slightly or remained stable each year. During this period, many of its shortcomings have also been continuously improved.
One of the many components of a solar water heater is the one that users most often touch, the mixing valve - the valve used in the bathing process. Some of its flaws are also what users can best understand:
First, the ordinary mechanical mixing valve is very difficult to mediate: a small amount of twisting by hand may cause a large change in water temperature.
Second, the determination of water temperature depends on the human feeling: the main problem in this aspect is that the user has to wait a long time to determine the true water temperature after adjusting the valve, because the adjusted water flows from the mixing point to the nozzle is not short. distance. If it is not suitable, it will be adjusted again, which is not only time consuming but also a waste of water resources.
3. If the user interrupts the bath (for example, when the bath needs to be applied), the valve needs to be closed. If the bath is continued, the adjustment should be made again. As a result, many users have not was able to close the valve in order to reduce the inconvenience, even in the process of not using water, which greatly wastes water resources.
4. At present, most of the solar water heaters are in the form of falling water, that is, the water pressure in the hot water pipe is completely provided by the pressure between the height of the water heater and the height of the user. Such a water pressure supply method is often unstable, and if the floor height is small, and the water pressure of the water pipe is unstable, the ordinary mechanical water mixing valve cannot control the pressure change of the water during the bathing process, and the final performance is: water discharge. It’s hot and cold.
Therefore, it is very necessary to develop a "solar water heater thermostatic mixing valve". This achievement not only has broad market prospects, but also saves water resources.
At present, although some companies have introduced “constant temperature mixing valvesâ€, most of them use springs with high thermal strain capability as springs or levers to drive valve changes. Although such improvements have made some progress, they still retain mechanical valves. Some disadvantages, such as the inability to achieve precise temperature control, still require the user to wait to test the water temperature, and the ability to adjust the water pressure is limited (indicated by a limited temperature adjustment range). At present, there are also some digital products that overcome these shortcomings, but the integration is often very high, usually with solar water heaters. There are only a few digital mixing valves that can be sold separately, but the technical means are too complicated and the equipment is too large (such as adding a water tank to act as a buffer for reducing the pressure of water pressure), resulting in a surprisingly high sales price, which is difficult to be accepted by the market. The sales are very poor.
Therefore, if a digital thermostatic mixing valve with relatively low cost and excellent performance can be developed, it has a wide market prospect and application value.
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