A solar thermal collector adapted to be assembled from a flat pack configuration, comprising a conduit (6) configured to carry fluid and to absorb radiation, a base (1) above which the conduit (6) is mounted and a plurality of panels configured to interconnect with the base (1) to produce a housing (8) for the conduit (6).

A photovoltaic thermal collector is provided with: glasses disposed on both a sunlight receiving surface side and an opposite surface side thereto; a hot-water producing portion and a power generating portion. An olefinic rubber sealing member (A) is disposed on at least one surface side of a power generating element of the power generating portion, and an olefinic rubber sheet (B) including carbon black is disposed on an opposite surface side thereto. In addition, a resin pipe as a channel of the hot-water producing portion is made of cross-linked polyethylene or polybutene; the resin pipe is sandwiched in the olefinic rubber sheet (B); and the olefinic rubber sheet (B) is further disposed in a side portion of the resin pipe and in a gap between one resin pipe and another resin pipe.

A photovoltaic thermal collector is provided with: glasses disposed on both a sunlight receiving surface side and an opposite surface side thereto; a hot-water producing portion and a power generating portion. An olefinic rubber sealing member (A) is disposed on at least one surface side of a power generating element of the power generating portion, and an olefinic rubber sheet (B) including carbon black is disposed on an opposite surface side thereto. In addition, a resin pipe as a channel of the hot-water producing portion is made of cross-linked polyethylene or polybutene; the resin pipe is sandwiched in the olefinic rubber sheet (B); and the olefinic rubber sheet (B) is further disposed in a side portion of the resin pipe and in a gap between one resin pipe and another resin pipe.

A solar automatic heat collecting and equalizing tube, including: a glass tube, an absorption tube, and a baffle. The glass tube is sleeved on the absorption tube. The absorption tube is coated with a heat absorption layer. The space between the glass tube and the absorption tube is vacuum. The baffle is disposed in the inner cavity of the absorption tube and is configured to drive a fluid in the absorption tube to tumble up and down alternately. The baffle is spiral in shape and fixed in the absorption tube.

A heat exchanger assembly includes a first stage heat exchange section defining one or more intakes for receiving a fluid. The first stage heat exchange section includes one or more preheater elements defining one or more preheat flowpaths extending radially inward from the one or more intakes with respect to a centrally disposed axis of the heat exchanger assembly. The one or more preheater elements include one or more guide vanes configured to guide a flow of the fluid in a spiral path from the one or more intakes toward the centrally disposed axis. A centrally disposed second stage heat exchange section is fluidly connected to the one or more preheat flowpaths to receive the fluid from the one or more preheat flowpaths.

A heat exchanger assembly includes a first stage heat exchange section defining one or more intakes for receiving a fluid. The first stage heat exchange section includes one or more preheater elements radially insertable into the first stage heat exchange section with respect to a centrally disposed axis of the heat exchanger assembly. The preheater elements define one or more preheat flowpaths extending radially inward from the intakes. The preheater elements transfer thermal energy to or from the fluid as the fluid flows from the intakes through the preheat flowpaths. A centrally disposed second stage heat exchange section defines an axial flowpath that is fluidly connected to the preheat flowpaths to receive the fluid from the preheat flowpaths. The second stage heat exchange section transfers thermal energy to or from the fluid as the fluid flows through the axial flowpath.

A heat exchanger assembly includes an absorber element defining an axial flowpath for a fluid extending along an axis. The absorber element includes an outer support wall and one or more support members extending radially inward from the outer support wall with respect to the axis. The heat exchanger assembly also includes one or more heat exchange elements floatably coupled to the one or more support members where the one or more heat exchange elements extend along the axial flowpath.