License-built in China, this German Ritter Solar 12-tube evacuated tube solar hot water collector is of high build-quality and has been field-proven worldwide. It is built to order as a standard finished product in any quantity directly from the manufacturer.

SKU/Item Number: CPC 12

The Product…

This evacuated tube collector was developed especially for solar domestic water heating and for solar backup space heating. The low pressure loss allows several modules to be connected in series. The collectors can be used for open or close loop applications with water or Glycol solution. This evacuated tube collector differs from the “heat pipe” type collectors commonly found on the market, it allows fluid to circulate through the U-tubes within the evacuated tubes thus reducing localized hot spots and scale buildup. It consists of three main components which are completely pre-assembled:

·Evacuated Tubes
·CPC Mirrors
·Collecting Box with Heat Transfer Unit

The Evacuated Tube...

The evacuated tube is a product that is optimized in geometry and performance. The tubes are composed of two concentric glass tubes which in each case are half spherically closed on one side and fused together on the other side. The gap between the tubes is evacuated and afterwards hermetically plugged (vacuum insulation). In order to make solar power usable, the internal glass tube is provided on its external surface with an environmentally friendly, highly selective layer and thus designed as an absorber. This coating is thus protected within the vacuum gap.It is an aluminum nitrite sputter layer which is characterized by very low emission and very good absorption.

The CPC Mirror...

In order to increase the efficiency of the evacuated tubes, a highly reflecting, weather-proof CPC mirror (Compound Parabolic Concentrator) is placed behind the evacuated tubes. The special mirror geometry ensures that even at unfavorable irradiation angles direct and diffuse sunlight falls onto the absorber. This substantially improves the energy yield of a solar collector. Unfavorable irradiation angles are given at diagonally incoming light (azimuth angle) (no south adjustment of the mounting area, sun progress from east to west, diffuse irradiation).

Collecting Box with Heat Transfer Unit...

The insulated collecting and distribution pipes are located inside the collecting box. The advance or return connection can take place alternatively on the left of or on the right. In each evacuated tube there is a U pipe with direct flow-through that is connected in such a way to the collecting or distribution pipe that each individual evacuated tube exhibits the same hydraulic resistance. This U pipe is pressed to the inside of the evacuated tube with the heat guide plate.