because they did
The pipe inside the solar panel is usually painted black because black is a good absorber of sunlight and helps to transfer heat more efficiently. The dark color helps to increase the effectiveness of heat transfer from the sun to the fluid circulating inside the pipe, which is then used to heat water or another medium in the system.
The longer pipe inside a solar panel box helps increase the surface area exposed to sunlight, allowing for more effective heat absorption. This helps the solar panel to heat up the water or fluid passing through it more efficiently, thus improving the overall performance of the solar panel system.
The polystyrene insulation helps to reduce heat loss from the black pipe, which is responsible for carrying the heated fluid in a solar panel system. By adding the insulation layer, the system can maintain a higher temperature of the fluid as it circulates, increasing the overall efficiency of the solar panel.
The color black absorbs more heat from light.
You should use black pipe -- Galv. pipe will flake off inside of pipe
If they are PV panels or heat pipe panels, they are not painted at all, paint would stop them working. Only a simple hot water radiator panel would be painted black and you would do this because the colour black absorbs all solar radiation, other colours reflect some of the suns energy.
A pipe inside the rear hatch has diconnected, simply remove the plastic inner panel inside the hatch and reconnect
Simple materials can be used like black plastic or metal pipe. You want materials that will absorb heat and transmit that heat to the liquid.
Black pipe is an amateur term for common steel or iron pipe.
a black pipe can not be used in plumbing.Of course black pipe has many used in "plumbing" gas fitting and steam fittingPneumatic lines are specified as black , Fire suppression systems black pipe, gas piping , oil supply , steam and hydronics black pipe
Bi pipe is a black iron pipe.
Black of course