Abstract: Heat exchange device adapted to extract or impart thermal energy from or to a body, which device comprises: a) a first plate assembly (1) comprising a substantially rigid first sheet member (4) having attached thereto a second sheet member (6) which is substantially congruent to the first member (4) and is formed with localised raised areas extending in either or both directions from the median plane of the second sheet member (6), the attachment around the periphery of the said sheet members (4, 6) being a sealing attachment so as to provide a sealed enclosure between the two sheet members (4, 6), the attachment within the plan area of the enclosure being intermittent and located at the point of contact of at least some of the raised areas of said second sheet member (6) with the opposed surface of said first sheet member (4), there being provided an inlet (20) for a heat exchange fluid to said enclosure and an outlet (21) for heat exchange fluid from said enclosure whereby heat exchange fluid can be caused