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太阳能热水器真空管集热器参数计算
来源:http://www.sdlntyn.com 发布时间:2016-12-29 15:32:48 浏览次数:517
据能量守恒定律,单位时间内集热器输出的有用能量等于集热器接收的太阳辐照能量减去集热器向周围环境散失的能量,即:
According to the law of conservation of energy per unit time useful energy collector output is equal to the collector receives solar radiation energy minus the collector energy loss to the surrounding environment, i.e.:
Qu=Qs—QL (6.
QL - Qu=Qs (6
式中,Qu为单位时间内集热器输出的有用能量,w;9s为同一时段内集热器接收的太阳辐照能量,w;QL为同一时段内集热器向周围环境散失的能量,w。
In the formula, useful energy, collector output per unit time Qu for W; 9s for the same period in the solar radiation energy, the heat receiving W; QL for the same period the collector energy loss to the surrounding environment, W.
将Qs和QL的数学表达式代人式(6.24),可得到;
The mathematical expressions of Qs and QL (6.24) can be obtained;
Qu=ApG(ra)e—ApUL(Tp—Ta) (6.
Qu=ApG (RA) e - ApUL (Tp - Ta) (6)
式中,Ap为吸热板面积,m2;G为太阳辐照度,W/m2;(ra)e为透明盖层透射比与吸热板吸收比的有效乘积,无因次;UL为集热器总热损失系数,W/(m2.K);Tp为吸热板平均温度,Ta为环境温度,K。
In the formula, Ap is the heat absorbing plate area, m2; G for solar irradiance, W / m2; (RA) e is a transparent cover layer and a heat absorbing plate absorption transmittance effective product than dimensionless; UL collector total heat loss coefficient, W / Tp (m2.K); the average temperature heat absorbing plate Ta, environmental temperature, K.
集热器效率可定义为集热器输出的有用功率与投射到集热器上的太阳辐照功率之比,
The collector efficiency can be defined as the useful power of the collector output and the ratio of the solar irradiance to the collector,
即:?= Qu/GAp (6.
Namely: = Qu/GAp (6)
将式(6.25)代人式(6.26),就可得到太阳能热水器热管式真空管集热器的瞬时效率方程:
The instantaneous efficiency equation of the heat pipe vacuum tube collector of the solar water heater can be obtained by the formula (6.25) generation (6.26):
?=(ra)e—UL·Tp-Ta/G (6.
= (RA) e - UL (Tp-Ta/G) (6)
2.真空管集热器的总热损失系数
Total heat loss coefficient of 2 vacuum tube collector
热管式真空管集热器的总热损失系数UL,是真空集热管热损失系数U,和保温盒热损失系数Ub之和。
The total heat loss coefficient of the UL heat pipe type vacuum tube heat collector, vacuum tube heat loss coefficient is U, and the thermal insulation box and the heat loss coefficient of Ub.
即:UL=Ut+Ub (6.
That is: UL=Ut+Ub (6
式中,Ut为真空集热管热损失系数,W/(m2.K); Ub为保温盒热损失系数,W/(m2.K)。
In the formula, Ut vacuum tube heat loss coefficient, W / (m2.K); Ub insulation box heat loss coefficient, W / (m2.K).
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