Plate heat exchanger for solar heating

A method comprising the step of using a plate heat exchanger together with a solar reflector, the plate heat exchanger comprising:

• an inlet;
• an outlet;
• and
• a plurality of channels extending between the inlet and the outlet for conducting a heat transferring fluid between the inlet and the outlet,
• wherein the plurality of channels are defined between a first plate and a second plate, the first and second plates being formed by stainless steel,
• wherein each of the plurality of channels has a single-curved extension between the inlet and the outlet as seen in a plane corresponding to a major surface extension of the first and second plates,
• wherein each of the plurality of channels along at least a portion of a longitudinal extension thereof has a triangular or a chamfered triangular cross-section or a parallelogram or a chamfered parallelogram cross-section, and
• wherein the side walls of two adjacent channels define an angle corresponding to, or smaller than, 100 degrees.

A plate heat exchanger for solar heating comprising:

• an inlet;
• an outlet;
• and
• a plurality of channels extending between the inlet and the outlet for conducting a heat transferring fluid between the inlet and the outlet,
• wherein the plurality of channels are defined between a first plate and a second plate, the first and second plates being formed by stainless steel,
• wherein each of the plurality of channels has a single-curved extension between the inlet and the outlet as seen in a plane corresponding to a major surface extension of the first and second plates,
• wherein each of the plurality of channels along at least a portion of a longitudinal extension thereof has a triangular or a chamfered triangular cross-section or a parallelogram or a chamfered parallelogram cross-section,
• wherein the side walls of two adjacent channels define an angle corresponding to, or smaller than, 100 degrees, and
• wherein said angle is smaller than 90 degrees.