The reason why the water heater fluid is full but still not hot
1. The fluid circulation pipeline is unreasonable
< p> Current Balcony wall-mounted solar water heaters are mostly natural circulation systems. The advantage of natural circulation is that it does not require external energy and relies on the difference in density of the fluid of the system itself to circulate automatically. However, the circulating water tank of the natural circulation system must be higher than the collector. Since the power generated by the fluid density difference of the system itself is very small, various measures must be taken to reduce the circulation resistance of the system. For example: choose a larger pipe diameter, keep the pipe as short as possible and make as few turns as possible to avoid reverse slopes and air blockage.
What to doe if the wall-mounted solar water heater is not hot
2. The ratio of the heat collection area The capacity of the water tank is unreasonable
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The manifolds of balcony wall-mounted water heaters include flat plate type, all glass tube type, heat pipe type and shaped tube type of U. Regardless of the type of collector, there is a lighting utilization rate of the building area. Although solar energy is clean and free energy, its energy flow density is low. Taking the sunshine conditions of 17 MJ/(㎡.D) as an example, all the heat of 1㎡ of solar energy is converted into hot water (temperature increase 40). degrees), which is only 102L. Due to various factors such as the utilization rate of the lighting area and the heat collection efficiency of the collector itself, the solar usage area of the balcony, the lighting duration of the balconyOn and the intensity of the lighting, the heat gain from solar energy is less. than the designed thermal load. In addition, the cold water temperature is relatively high in autumn and winter, but the bath temperature should indeed be higher, and the heat load increases when the water capacity of the pressure water tank remains. unchanged and the electric heating does not start, the temperature of the water heated by solar energy will be lower than in other seasons.
3. The heat transfer efficiency of the wall-mounted heat exchanger of the balcony solar water tank is low
According to Fourier law, heat transfer efficiency Closely related to the heat exchange contact area, average flow rate and heat exchange material, current forms of heat exchanger tanks wall-mounted solar water heaters on balconies include a small covering, a jacket and a coiltin. In terms of heat exchange area, the heat exchange area of the jacket and the coil is larger than that of the small liner. In terms of average flow, the forced circulation system is better than natural circulation. material, most jacketed water tanks with enamel coating are used and copper coils are better over enamel coils.
Can solar thermal conductive media be consumed alone
Natural circulation wall-mounted solar energy: The characteristic of natural circulation is that the water storage tank must be installed above the horizontal plane at the top of the flat solar collector. System circulation. The water in the split solar collector of the device is radiated by the sun, which causes the water temperature to increase and the density begins to decrease gradually with the water in the water storage tank which does not was note radiated. the sun. The difference in water density is also called thermosyphon pressure. The process of circulating water without the aid of an external force is called natural circulation. The greater the density difference in the operation of natural circulation, the faster the traffic speed and, conversely, the slower the circulation. This circulation method can make the water in the water storage tank continue to heat up, the solar radiation stops, and the circulation occurs gradually.Termination.
Forced Circulation Wall Mounted Solar: Forced circulation, as the name suggests, uses an external force to force the water in the collector and water storage tank to circulate. Its characteristic is that the position of the water storage tank is not limited by the position of the flat solar collector and can be adjusted arbitrarily, either higher than thee divided solar collector, lower than the collector. It uses a water pump to circulate the water received by the solar collector divided from solar radiation and the water in the water storage tank, so that the temperature of the water in the storage tank of water gradually increases. Hot water is obtained by heat exchange in a special heat exchanger located in the hot water storage tank.
Yes. The reason is that wall-mounted solar panels on balconies rely on heat conduction media (propylene glycol is used in the north to prevent freezing, and pure water and anti-rust additives are generally used in the south) to heat conduction if residents do so. Do not use it for a long time, the water in the bucket will continue to heat up and the air in the medium and the system will expand, causing the pressure in the closed space of the tank to increaseof water. the middle of the exchange system leaks easily. The medium itself will also be consumed during the circulation process, ultimately leading to a lack of medium in the heat exchange system, reducing the contact area of heat exchange and reducing the exchange rate, thereby lowering The water temperature can also cause a vicious circle in which the heat exchange system cannot work properly, affecting the life of the bucket and after two or three years of using the solar water heater, the heat transfer fluid will be lost when heated; affecting the heat exchange effect.