How solar water heating systems with thermostatic mixing valve appropriate

Thermostatic mixing valve self-similar appearance a 4-pass valve, the valve port 3, a temperature control. 3 valve has two mouths are the hot and cold water inlet, and the other is the outlet temperature. Department in the outlet equipped with a thermal component, the use of thermal characteristics of components to promote mobile spool valve body, sealing or open cold water intake, cold water in the closure of the open water at the same time. When the temperature adjustment knob after setting a water temperature, regardless of the temperature of hot and cold water, pressure changes, into the outlet of the hot and cold water also changes the ratio, which has always been employed to maintain constant water temperature. At present, solar water heater manufacturers water heater most of the use of hot and cold water valve or switch Ischaemum mechanical troubled waters mixed water temperature regulation. Solar water heater due to temperature changes have a lot of hot water, hot and cold water pressure a lot to be repeated before each use regulation, when the bath water pressure, water temperature changes, the situation will have a cooler. Foreign imports of individual manufacturers mixing valve temperature, as a selection of matching products for users, because prices were too high, thus limiting its promotion.



Demand for the domestic market, Beijing Technology & Trade Center, the sun-ho-yu developed specifically for the use of solar water heaters for the 15mm diameter of the mixing valve, and its price is only 20% of foreign products, the performance characteristics and specifically the use of solar water heater and applied for a national patent. Here Kemao Beijing Hao Yu Sunshine Center production mixing valve water heater thermostat and use of experimental.



1, the water flow



Test: When the hot and cold water imports are pressure 0.1Mpa (1kg), the water is 0.98m3 / h (that is, more than 16L per minute) can theoretically lead three shower heads. Water pressure due to the sun may only 0.25kg ~ 0.3kg, to the water temperature constant, a mixing valve only with the best of a shower nozzle. If we can increase the water pressure, with more nozzles.



2, hot and cold water inlet pressure



Products to allow for hot and cold water pressure differential 8:1. Cold water pressure of not more than 2.5kg, the water pressure 0.3kg, can be normal troubled waters. Instability if the water pressure may be higher than 2.5 kilograms, it is necessary to install pipe in cold water limiting valve, such as "100 million to" water heaters are equipped with every machine limiting valve. If the valve can be installed manually resistance both as a switch using cold water as well as regulation of flow, pressure does not guarantee value.



3, security features - anti-scalding feature



Cold Intake with self-closing performance. When used on or off if the cold water, a few seconds, the water will automatically shut down to ensure that people will not burn. The time required for a few seconds, temperature is the temperature sensor element to the valve core mobile implementation of the time required to close the hot water, hot water temperature the higher the shorter closing time, if the water temperature above 80 ℃, 23 seconds as long as you can启锁. Water scald accidents are often caused by misoperation, solar water heater thermostat is equipped with the equivalent of mixing valve Anti-scald safety valve installed. Abroad, some countries (such as New Zealand) on the installation of solar water heaters require the installation of thermostatic mixing valve, in addition to easy-to-use, water conservation, and also to consider the safety factor.



4, automatically only to emissions and use of water in the cooling water pipe



Bath water temperature about 40 ℃, thermostatic mixing valve when the temperature is set, the whole hot and cold water inlet opening, according to the ratio of water to the outlet; stop using when the outlet closed, due to water pressure, water will possession of a certain amount of water lost, and the valve body temperature and the role of components because of cold water, cold water will gradually close the mouth and I opened the hot water, and the entire water system will be static. Taking into account the cold-water pressure, and the mixing valve outlet shut down by the pressure of hot and cold springs, rubber seal is the temperature, the seal may be leaking, if dissatisfied with the water tank can be automatically only when the Sheung Shui, and water tanks full, the cold water pipe installed on the closure of the valve is necessary. When re-bath, open the outlet switch, doors closed because of cold water, first of all, the hot water outflow pipe in the cooling water, when water under high temperature, a temperature components will move off the mouth of small hot water, cold water to open the mouth, automatically conditioning thermostat.



5, after a constant temperature mixing valve for adding water tanks



Thermostatic mixing valve temperature adjust button marked arrows point to 55 ℃ and 25 ℃, the direction of the representative of temperature, water temperature at the right feel, and stop spinning action is needed to set up your temperature. High-temperature direction at the end of the closure of cold water; low-temperature direction at the end of the closure of water. After testing, will be mixed in cold water valve to the closed state, if the water temperature exceeds 55 ℃, the water will automatically open the mouth; to the closure of water status. Cold water less than 5 ℃, the hot water I would not completely shut down.



Sheung Shui to achieve functional, it is necessary to make the outlet hot and cold at the same time open, and open the cold water switch. Adjustment knob from 25 ℃ ~ 55 ℃ regulation may be rotated beyond 720 ° (twice), two intake can be open at the same time does not exceed the rotation above 90 °, sometimes only 45 ° rotation, to find the rotation paragraph, the cold hot mouth wide open, you can reach the outlet, Sheung Shui, the purpose of the closure. At room temperature under normal conditions, the cold water temperature is normally 5 ℃ ~ 25 ℃ between, when the stop bath, the mixing valve body temperature that is the pressure of cold water temperature. Described in front, when the water temperature is set at 40 ℃, after the cold water bath to stop I will automatically shut down. If the direction to the low-temperature regulation, I will open the cold water.



Not identified in the circumstances, the direction of first low-temperature knob to the end of winter (assuming the water temperature 5 ℃ ~ 10 ℃), then back 45 °, (turning 1 / 4 circle), summer (assuming the water temperature of 20 ℃ ~ 25 ℃) callback 90 °, can be two intakes into the open at the same time, open the cold water valve to complete the Sheung Shui. In order to prevent overflow of water tanks, pipes should be installed in cold water to close the valve, water heater when not in use the closure of Sheung Shui pipeline.



Described above to be more practical to use the test, I hope more users and solar energy to explore engineering and technical personnel involved in research. I believe the near future, there will be more user-friendly type of solar water heater market fool, so that the energy-saving solar water heaters, water-saving, safe and convenient direction. 

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