Solar cell modules are mainly encapsulated by vacuum hot pressing method. The gap between their performance and compatibility with foreign countries is gradually narrowing, but further optimization is needed in terms of energy consumption, temperature uniformity of heating system and equipment intelligence.
The heat transfer oil heating system of the laminator can independently control the heating temperature, effectively improve the heat transfer effect between the existing electric heating system, the boiler heating system and the workbench, and improve the temperature uniformity of the workbench surface.
First, the principle of solar cell module lamination heat transfer oil heating system
The solar cell module laminar heating system consists of an expansion box, a heater, a temperature sensor, a heating power controller, a PLC, a thermal oil line, a heat oil pump, and a touch screen.
The thermal oil heating system working principle of the laminator: turn on the power switch, and set the working temperature of the packaging platform through the touch screen.The heat-conducting oil is used as the heat carrier, and the heat-conducting oil is heated in the heater. Two sets of heating systems are arranged in parallel behind the hot-oil pump, which are controlled by the heating power controller; There are two sets of independent two-way serpentine pipelines, the hot oil flows in the reverse direction, and the temperature is automatically compensated; an expansion tank is arranged on the upper part of the heater, one end of the two pipelines is connected with the expansion tank and the hot oil pump, and the other end is connected with the heater. After expansion, the excess heat transfer oil can be returned to the expansion tank, and then added to the heating system when cooled; the temperature sensors are located at the inlet, outlet and heating plate of the hot oil pipeline of the heater, and the detected temperature signal is transmitted to the PLC, which is heated by the heating system. The power controller processes the temperature signal and controls the heater power; finally, the hot oil passes through the packaging platform and then returns to the heater for reheating, thus forming a closed loop.
Second, Selection and calculation of heat transfer oil heating system for laminator
(1) Find the heating power
P=W×△t×C×S/860×T
W=Mold weight or cooling water KG
△t = The temperature difference between the desired temperature and the starting temperature.
C= Specific Heat Encapsulated Platform Steel (0.11)
T = Time to warm to desired temperature (hours)
Considering that the solar cell module laminating machine heating system is semi-enclosed heating and the reliability of the heating capacity, the heat balance calculation results should be verified, and the common coefficient is 1.2.
(2) Find the size of the pump
Need to know the pump flow and pressure (head) required by the customer
P (Pressure Kg/cm2)=0.1×H(Head M)×α(Specific gravity of heat transfer media, water=1, oil=0.7-0.9)
L (media required flow L/ min)=Q(mold required heat Kcal/H)/C(media than hot water=1 oil=0.45)×△t(Temperature difference between the circulating media in and out of the mold)×α×60
The thermal oil heating system of the laminator is simple and convenient to install. It adopts a high-precision intelligent control program, and the temperature uniformity of the packaging platform is improved, which improves the quality of the laminator and is conducive to improving the packaging quality of solar cell modules.
