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太阳能集热器的循环方式
来源:http://www.sdlntyn.com 发布时间:2016-5-5 18:12:06 浏览次数:639
1、自然循环式:
1, natural circulation type:
此种型式的储存箱置于收集器上方。水在收集器中接受太阳辐射的加热,温度上升,造成收集器及储水箱中水温不同而产生密度差,因此引起浮力,此一热虹吸现像,促使水在除水箱及收集器中自然流动。由与密度差的关系,水流量于收集器的太阳能吸收量成正比。此种型式因不需循环水,维护甚为简单,故已被广泛采用。
This type of storage tank is placed above the collector. Water in the collector received solar radiation heating, temperature rise, resulting in the collector and tank water temperature at different and produce density difference, thus causing buoyancy, the thermal siphon, promote water in addition to the water tank and collector in the natural flow. The solar energy absorbed by the collector is proportional to the density difference. This type because of no need to recycle water, maintenance is very simple, so it has been widely used.
2、强制循环式:
2, forced circulation type:
热水系统用水使水在收集器与储水箱之间循环。当收集器顶端水温高于储水箱底部水温若干度时,控制装置将启动水使水流动。水入口处设有止回阀以防止夜间水由收集器逆流,引起热损失。
The water in the hot water system causes the water to circulate between the collector and the water storage tank. When the top water temperature of the collector is higher than the water temperature of the bottom of the water storage tank, the control device will start the water to make the water flow. The water inlet is provided with a check valve to prevent the water from the collector at the counter current, causing the heat loss.
由此种型式的热水系统的流量可得知(因来自水的流量可知),容易预测性能,亦可推算于若干时间内的加热水量。如在同样设计条件下,其较自然循环方式具有可以获得较高水温的长处,但因其必须利用水,故有水电力、维护(如漏水等)以及控制装置时动时停,容易损坏水等问题存在。因此,除大型热水系统或需要较高水温的情形,才选择强制循环式,一般大多用自然循环式热水器。
The flow of this type of hot water system can be learned (due to the flow of water from the water can be known), easy to predict performance, can be calculated in a number of times the amount of heating water. Such as in the same design condition, compared with natural circulation has the strengths of high temperature can be obtained, but due to the use of water, so it is water power, maintenance (such as leakage, etc) and control device of dynamic stop, easy to damage the water exists. Therefore, in addition to large hot water system or the need for a higher water temperature, the forced circulation, the general use of natural circulation type water heater.
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