Heat exchanger cap

1. A heat exchanger cap configured to conform to a human head, the cap comprising:

a first element for covering one side of the head;

a second element for covering the other side of the head; and

an intermediate joining element joined to and which spaces apart the first element and second element, the intermediate joining element having a length measured between a front and a back and also having a width, the width being substantially constant along the length;

the intermediate joining element extending outward beyond two sides of the first and second elements;

each of the elements defining a single passageway for the passage of fluid through the cap;

each of the elements being provided with a flow interface in the region where the elements are joined;

the flow interface defining an inlet for the passage of fluid into the passageway of one of the elements, and an outlet for the passage of the fluid from the passageway out of the same element; and

in at least the first element and the second element the single passageway defines flow regions on both sides of a junction line with each of the flow regions extending along just a portion of the cap with the portions located on opposing sides of the junction line, the passageway in each of the flow regions of the first and second elements comprising a boustrophedonic route aligned in a direction from back to front of the first and second elements.

2. The heat exchanger cap as claimed in claim 1 , wherein the intermediate joining element is provided with a main inlet for the passage of fluid into the cap, and a main outlet for the passage of fluid out of the cap, wherein the main inlet defines a beginning of the single passageway and the main outlet defines an end of the single passageway.

3. The heat exchanger cap as claimed in claim 1 , wherein the side elements are configured to conform to a temple, parietal, and side regions of the head.

4. The heat exchanger cap as claimed in claim 1 , wherein the intermediate element is configured to conform to a top, crown and nape of the head.

5. The heat exchanger cap as claimed in claim 1 , wherein:

each of the interface regions of the first and second elements are provided in an abutment wall which extends along one side of the respective first or second element and describes an arc extending from a location corresponding to a temple and parietal regions to a nape region of their respective side of the head; and

the intermediate element having an abutment wall on two sides along the length, each of the intermediate element abutment walls configured to abut with one of the first or second element abutment walls;

the abutment walls and the first and second elements having a geometry configured such that, when the abutment walls are fixed together the first and second elements are biased towards defining a predetermined cap geometry which is resistant to distortion.

6. A heat exchanger cap configured to conform to a human head, the cap comprising:

a first element for covering one side of the head;

a second element for covering the other side of the head; and

an intermediate joining element joined to and which spaces apart the first element and second element and which has a substantially constant width, the intermediate element extending outward beyond the first and second elements on both a nominal front and a nominal back of the cap;

each of the elements defining a single passageway for the passage of fluid through the cap with the passageway comprising a cap inlet to receive the fluid and a cap outlet to which the fluid is emitted;

each of the elements being provided with a flow interface in the region where the elements are joined;

the flow interface defining an inlet for the passage of fluid into the passageway of one of the elements, and an outlet for the passage of the fluid from the passageway out of the same element;

the passageway has a boustrophedonic route in each of the elements, and the boustrophedonic route is aligned with a direction from the nominal front of the cap to the nominal back of the cap.

7. The heat exchanger cap of claim 6 , wherein the passageway comprises a substantially constant shape between the cap inlet and the cap outlet.

8. A heat exchanger cap configured to conform to a human head, the cap comprising:

a first element to cover one side of the head;

a second element to cover the other side of the head; and

an intermediate joining element that covers a top side of the head, the intermediate joining element is positioned between and spaces apart the first element and second element and comprises a first abutment wall that extends along a first lateral side and a second abutment wall that extends along a second lateral side, the intermediate joining element comprising a substantially constant width measured between the first and second abutment walls;

the first abutment wall connected to the first element along a first joint and the second abutment wall connected to the second element along a second joint, each of the first and second joints comprises a forward section and a rear section;

the intermediate joining element extending outward beyond the first and second elements at both a nominal front and a nominal back of the cap;

each of the elements defining a single passageway for the passage of fluid through the cap;

a first flow interface positioned between the forward and rear sections of the first joint and the second flow interface positioned between the forward and rear sections of the second joint, each of the first and second flow interfaces comprising an inlet for the passage of fluid into the passageway of the respective element from the intermediate joining element and an outlet for the passage of the fluid from the respective element into the intermediate joining element;

the passageway has a boustrophedonic route in each of the elements that is aligned with a direction from the nominal front of the cap to the nominal back of the cap.

9. The heat exchanger cap of claim 8 , wherein the first and second joints comprise spot welds.

10. The heat exchanger cap of claim 8 , wherein the first and second joints permanently join the elements together.