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a, mix water cooling device ( Mix water center)warm mix water cooling unit in high temperature water, mixed with part of the low temperature water transfer temperature difference small flow of hot water temperature difference large circulating water flow rate, its main function is to improve the safety and comfort, of floor heating system using energy saving effect is secondary. Core components in the mix water cooling device: mixed water circulation pump ( Household usually choose shielding pump) , mix water components, temperature control valve, temperature sensor and thermal protector, etc. High temperature water into the system, and after floor heating coil and cooling of low temperature floor heating mixed backwater in the mix water components; Mix the right temperature of the water after booster pump into the water segregator, and then by heating floor heating coil heat dissipation; Booster pump is used to provide the mixed water power; In the mix water system, mix water components to have control of the mixed water temperature in the value of the function, avoid mix water temperature is not stable as the water temperature changes. Through constant mix water valve, mixing tank, four-way valve control, such as the high temperature water heating system and floor heating water mixing the water required for floor heating temperature.
mix water with constant mix water valve valve structure advantage is: when a sudden blackout in work, if the water temperature more than set value, mix water valve will automatically close the heating water, avoid high temperature water into the floor heating, floor heating protection; Mix water and water temperature is lower than the set value, the valve can automatically open hot water channel for water floor heating, shut down automatically backwater channel, to avoid further reduce the water temperature, maintain indoor temperature not drop too much. Constant mix water valve is larger than self-reliance type temperature control valve flow coefficient Kv, but still can't compared with electric ball valve structure. There is impurity easy to plug card dead in the water, temperature control failure. In addition constant mix water valve in order to ensure accuracy of temperature control, temperature control is difficult to do a wide range.
mix water with heat exchange tank through regulating valve actuators, control of mix water, mix water and exchange. Mix water adequately, area size can be used to that, could be selected according to the heating area of mixed water specifications. With four-way valve is controlled by PI controller of electric four-way valve disc position to adjust the temperature and flow rate, the second floor heating water temperature constant, maintaining and director of the diameter of the large flow of water supply. Don't need another bypass, to overcome the existing three way valve on the market, mix water valve small flow rate and the problem of large temperature fluctuations. But choose to pay attention to: 1) The operation of the mixed water pump parameter selection; 2) Temperature controller, control valve, regulating valve performance is reliable; 3) To prevent idle running water shortage protection; 4) To form a complete set of network system, ensure the whole heating system operation effect; 5) The building or residential area, choose mix water pump should be consider control frequency conversion control technology. We usually say of floor heating is short for 'low temperature hot water floor radiant heating system', compared with the traditional radiator heating means has the characteristics of comfortable, energy-saving, healthy. But have more strict requirements on water temperature of floor heating, the ground USES floor system, the highest temperature of 60 ℃ hot water; Use compound wood floor of floor heating systems generally require water temperature below 45 ℃; Real wood floor demands water temperature is not higher than 35 ℃. But at present our country most of the central heating or district central heating system is aimed at a radiator heating user design, user generally supply water temperature in 80 ℃ ~ 90 ℃, far higher than the temperature of the floor heating requirements thus cannot be directly used for floor heating. This makes many users looking for central heating floor heating it, suppliers of floor heating at the same time also to a large number of users. Hanging furnace heating while it is possible to adjust the water temperature to the use of floor heating temperature, but its design is usually carried out in accordance with the radiator heating temperature and flow rate, applied directly to exist condensation on the surface of heat exchanger affect life of floor heating, circulating water flow is not enough to lower heating power, and cooperate with mix water floor heating and cooling system will achieve better results. Mix water cooling device for central heating floor heating users, its main function is to improve the use the safety and comfort of underfloor heating, energy saving effect is secondary; Even with the energy saving effect, but also by controlling the room temperature not to exceed needs temperature and implementation, mix water cooling device itself is a kind of water mixing device, is a small heat flow of hot water into low temperature difference big flow of the circulating water device, itself doesn't have any energy saving effect. After adopting mix water cooling device, can give the central heating users provide appropriate flow of low temperature large circulating water of floor heating, meet to the requirement of safety and comfort of floor heating, its basis can be found on the floor heating procedures: 'regulations of radiant floor heating technology' ( JGJ 142 - 2004). In the regulation of water temperature mainly include the following: 1) Low temperature hot water floor radiant heating system of supply and return water temperature should be determined by calculation. Civil construction water supply temperature 35 ℃ to 50 ℃, appropriate USES should not exceed 60 ℃, supply and return water temperature difference should be less than or equal to 10 ℃. The highest temperature is not easy to more than 60 ℃, which is also the main parameters that affect the use of floor heating is security, to ensure the service life of floor heating, should strictly abide by; For floor heating pipe, the temperature on the aging properties and service life has very big effect, such as PE - RT pipe service life under 60 ℃ up to 50 years, and 70 ℃ were reduced to 10 years, 80 ℃ was only two years, 90 ℃ is only a year. So controlling water temperature for the long time safe work has very important significance.
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