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The scale of the harm of solar energy water heater

1, solar vacuum tube is solar water heater collector, absorbed directly the sun's rays, and use hot water, a small proportion of the cold water more than major principle, the vacuum tube has been sunlight heating water and water tank of cold water exchange, the water heating tanks. Set thermal efficiency is measured solar water heater vacuum tube performance, one of the important indexes of solar water heater collection efficiency embodied in vacuum-tube technology, mainly by vacuum light transmittance, one-way reflectance and vacuum heat insulation rate three criteria decision. Light transmittance determines the vacuum tube set thermal efficiency, i.e. : light transmittance, set the higher heat efficiency is higher. This problem we from solar energy collector energy balance equation: Q = QI - from QL and collector efficiency formula: η = Q/A * G can see: the higher transmittance, collector of solar radiation absorbed QI is more high and collectors are useful energy absorption higher, collector efficiency qq η higher; And vice versa. But light transmittance is measured in laboratory data, while in the actual application of continuous water when a half month, vacuum tube wall is formed namely on visible furring membrane, then light transmittance only to reach new vacuum 85%, use half a year later, in the vacuum tube wall can form 1-2mm thick scale shell, its light transmittance only new vacuum tube below 50 per cent of the thermal efficiency, at this time of set new vacuum tubes than also declined to 50%.
2, for withdrawal scale problems and for vacuum tubes burst and leak causing the whole system paralysis, some high-grade solar water heater and large couplet platoon solar energy engineering, balcony wall-mounted solar water heater is used more solar heat pipe, and that no longer for water treatment, but heat pipe heat produced by more focused on copper probe, because of high temperature probe, the area is small, are more prone to probe into a scale package, because of the heat pipe heat through HTM, thermal sensor repeatedly exchange, right of more sensitive, scale scale heat efficiency has greater influence.
3, scale of thermal conductivity is extremely low, less than one percent of metal, it adhere to the solar energy heating tube wall lead to absorb heat collector cannot deliver timely and water, cause temperature is exorbitant, extremely easy Fried tube, a kettle leaking is this truth. Likewise your solar year low temperature, and finally caused tube scrap, attentive users will find, the home of solar energy water temperature no higher than that of last year, is the scale." Scale by conventional means cleaning is difficult, thermos bottle of scale we also cleared, whether very hard, it is difficult to clean. Same vacuum tube diameter fine, harder to clean thoroughly.
4, scale corrosion cause slack tank, heat preservation effect, destroying the solar water heater, reduce the using life. Before the sun with tin manufacturing at home with no leakage for few years, is scale the reason of corrosion. Now the solar energy water heater tank is usually adopts 304 stainless steel. In manufacturing welding, although have argon protection, but by high temperature affected, make the weld metal crystal near as change, namely of austenite into martensite. Containing chlorine ion of water in constant heating process, accelerate the weld surrounding metal corrosion perforation.
5, scale effect water thermometer and electrical heating system, resulting in the normal use of equipment damage.
6, because the vacuum tube surface is very slick, shell in water scale under the impact of generation falls off, causing the vacuum tube water cycle impeded and jam.
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Author:Zhejiang Haining Tiange Solar Energy Science Technology Co., Ltd.
website:www.sunnyrainsolar.com
main product:Solar energy     Solar water heater   Solar collectors   
 Integrated pressurized Solar water heater  Split Pressurized solar water heater    Compact solar water heater
 

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