澳门永利

澳门永利唯一官方网站

设为主页 | 加入收藏 | 企业邮箱

2 1

新闻中心

联系我们Contact us

联系人: 肖经理

手机: 15861401881

电话:0510-85186280
传真:0510-85180342
邮编:214133
网址:www.geemik.net
邮箱:xmq881210@163.com


 

新闻中心

您当前的位置:首页>>新闻中心

热水器中常用的换热器是为了防冻

 

太阳热水系统中常用的换热器为了防冻,在水箱里面加一个换热器,工质(即防冻液)在集热器和换热器组成的循环回路里循环,不断加热水箱里的水。

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.

常用的换热器有以下几种:(1)肋片管或光管换热器如所示,在水平或垂直水箱里加一根或几根管子,这种结构易实现自然循环,但换热效率较低。Mertol1981)对这种结构的自然循环换热器进行了数值模拟研究,他假设换热器换热系数U为恒定值,等于170Wm-2K-Webster1987)提出了一种确定新的集热器效率因子的方法。目前这种结构的换热器很少使用。

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.

  夹层水箱换热器通常有两种形式①水平夹层水箱换热器如所示,它通常用于自然循环系统中,提高工质进口位置,可提高水箱温度分层及系统性能,但工质进口位置高会增加上回流热损,而且会降低工质循环流速。②垂直夹层水箱换热器如所示,它通常用于强制循环系统中,进口位置通常位于夹层底部,这种结构易实现水箱温度分层。如果水箱中装有电加热器,工质进口位置必须低于电加热器所在位置。

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.

  这种结构的换热器通常放在垂直水箱里,采用强制循环的方式,它有利于水箱温度分层,但换热器里流动阻力较大,故不宜采用自然循环如所示,这种结构把换热器和水箱分离,工质循环则采用强制循环,水循环则采用自然循环或强制循环。

This structure for heat exchanger www.hreqi.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.