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    熱水器中常用的換熱器是為了防凍

     

    太陽熱水系統中常用的換熱器為了防凍,在水箱里面加一個換熱器,工質(即防凍液)在集熱器和換熱器組成的循環回路里循環,不斷加熱水箱里的水。

    Solar water heating systems commonly used for heat exchanger to antifreeze, and inside the tank and a heat exchanger, refrigerant (antifreeze) in the heat collector and heat exchanger composition loop cycle, we in the heating water tank water.

    常用的換熱器有以下幾種:(1)肋片管或光管換熱器如所示,在水平或垂直水箱里加一根或幾根管子,這種結構易實現自然循環,但換熱效率較低。Mertol1981)對這種結構的自然循環換熱器進行了數值模擬研究,他假設換熱器換熱系數U為恒定值,等于170Wm-2K-Webster1987)提出了一種確定新的集熱器效率因子的方法。目前這種結構的換熱器很少使用。

    The common heat exchanger has the following kinds: (1) the fin tube or the light tube heat exchanger as shown in the horizontal or vertical tank with one or a few pipe, this structure is easy to realize natural circulation, but the heat transfer efficiency is low. Mertol (1981) on the structure of natural circulation for heat exchanger were studied by numerical simulation. He made the assumption that the heat exchanger and the heat transfer coefficient u is a constant value equal to 170Wm-2K-, Webster (1987) proposed a method of determining a new collector efficiency factor. At present, the structure of the heat exchanger is seldom used.

      夾層水箱換熱器通常有兩種形式①水平夾層水箱換熱器如所示,它通常用于自然循環系統中,提高工質進口位置,可提高水箱溫度分層及系統性能,但工質進口位置高會增加上回流熱損,而且會降低工質循環流速。②垂直夾層水箱換熱器如所示,它通常用于強制循環系統中,進口位置通常位于夾層底部,這種結構易實現水箱溫度分層。如果水箱中裝有電加熱器,工質進口位置必須低于電加熱器所在位置。

    Interlayer water tank heat exchanger usually have two forms of horizontal interlayer water tank for heat exchanger as shown, which is typically used in a natural circulation system, improve the working substance inlet position, can improve the tank temperature stratification and the performance of the system, but working substance inlet position high will increase recirculation heat loss, and reduce the refrigerant flow rate. The vertical interlayer water tank heat exchanger, as shown, is usually used for the forced circulation system, and the inlet position is usually located at the bottom of the sandwich layer, which is easy to realize the temperature stratification of the water tank. If the water tank is provided with an electric heater, the inlet position of the working substance must be less than that of the electric heater.

      這種結構的換熱器通常放在垂直水箱里,采用強制循環的方式,它有利于水箱溫度分層,但換熱器里流動阻力較大,故不宜采用自然循環如所示,這種結構把換熱器和水箱分離,工質循環則采用強制循環,水循環則采用自然循環或強制循環。

    This structure for heat exchanger www.yybnkj.com   are usually placed in the water tank is vertically, using forced circulation way, it is conducive to the tank temperature stratification, but replace the heat exchanger flow resistance is large, and therefore should not be used for natural circulation as shown. This structure to heat exchanger and separating the water tank, circulating refrigerant is used forced circulation, the circulating water by natural circulation and forced circulation.

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