The mathematical model of system dynamic characteristic is expressed by the characteristic factor
No hot water system in unit time unit daylighting to the collected heat from the sun's radiant energy deposition for v, among them, the part of the heat
Gu to the available amount of the heat transfer of water quality. The male part of heat gs used to heating water heater system parts. The rest of the heat
Is through to the heater surface, the bottom of the heater and water heater system lose scattered in other departments. The three parts of heat loss respectively
Frame, a g12 and g13 said. And then, the water heater system heat balance can be written
Team drove ten catch a g12 ten gm = g
If heated surface and horizontal plane into a corner, then the projection on the inclined heated radiant energy to become
N - Hb's Nl ten
The Hb and Hd level respectively on the surface of the direct radiation and scatter radiation intensity. 5 t is heated surface [
The Angle. If the heater surface towards the equator, the
Cos9T = 5 m (g a 5 m 90 cos (9 all c05 ooze s.
Long as the zenith Angle, it is equivalent to A = o. At the time of 6 t. so
Cos long = sm gsin 5十 c05gc055c05b
The heat absorption by the hot plate can watch for
G = e (M) young (8)
On a clear the atmosphere of the factory, the sun's radiant energy is mainly composed of the direct radiation. In addition to other direct radiation penetration, absorption characteristics
Factors also had a lot to do with Angle of dT, this makes the total radiation effective absorption and penetration rate of the product (r) e and f have some sort of.
According to the variable relationships. In [less than about 75., within the scope of the relationship (a?) e and 6 t can be approximately expressed as the form of such as F
(suction) c = A - B/cos dT ((J)
Among them A and B depends on transparent meng plate material, layer number and the heated plate is A constant. Generally speaking, dT in general
45. "Fan leap, (r) G is not strong, along with the change of 9 t more than 45. When this change significantly until it changes dramatically.
In unit time, water heater system by mining on the heat loss by the surface of heat exchanger is often represented as
G11 = Ud (small a 6)
The Z2 as ambient temperature, ZP average temperature between slaughtered for heated plate, yc? For the heat transfer coefficient. Type (10) is only the heat loss gl? the
The complexity of the way, all are focused on the heat transfer coefficient of Dcl f:, the latter is through the type (10) the combination of the following simultaneous equations for d
Ao (71) from a 10 '(11-11)/(m 1061 1)? L? = o
A1 (2 \ a 21) ten '(21-21)/(to ten to a 1)? Ll = o
Type in the Ao, Al,... - such as heated plate and the inner layer of transparent cover board and the coefficient of convection heat between two layers of transparent cover board
A - outer exothermic coefficient;
T - the absolute temperature.
Heated objects bottom heat loss if the insulation state of normal, mainly through the thermal conductivity. In order to form
Part of the loss can be table claw
A g12 = tJc2 (2 I)
A merger with type (10) available again
G = c (into the Uc -
Other parts of the heat loss is the water tank of cooling and heat dissipation of pipeline
Between the average temperature. The heat will be
Gu - UT (A - 6) ten yPP (2 m - f:)
The above talk about all kinds of heat loss is relative to the mining of the heater unit on the surface of the pervious to light.
Collected for mining heat exchanger and did not lose that part of the heat, the system effective water capacity and absorbed by the rest of the system,
The heat absorption by the unit of time
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