Abstract: A method for measuring and adjusting the temperature of surface ice in artificial ice rinks, in which water is frozen to ice with the aid of refrigerating channels arranged in the rink and through which refrigerant is passed a by means of a refrigerating system and wherein the temperature of the ice is controlled by controlling the refrigerating power of the refrigerating system. The method is mainly characterized in that the surface ice temperature is measured with the aid of at least one sensor, which functions to measure infrared radiation from the surface ice. The signals produced by the sensor are processed in a control unit which controls the refrigeration system in a manner to bring the surface ice to a predetermined temperature. The invention also related to an arrangement for carrying out the method.

Abstract: A method of heat exchange comprises advancing energy-carrying medium in a channel system comprising channel-part lengths (1) which extend in side-by-side mutually parallel relationship, such as hose parts (1), and substantially sheet-like or slab-like base parts (2) which support the channel parts. The method is mainly characterized by supporting and holding channel parts (1) with the aid of at least one pre-fabricated sheet or slab (2) of heat-insulating material, such as so-called cellular plastic material, and by inserting the channel parts (1) into locking grooves (3, 4) included in the slab or sheet, the width of locking grooves, when appropriate, being preferably slightly smaller than the width of a channel part, in appropriate cases the diameter of the channel part. The invention also relates to an arrangement for carrying out the method.

Abstract: An arena floor useful alternately as a support for a slab of artificially frozen ice, and, when free from ice, as a deck suitable e.g. for practicing gymnastics and various games, is composed of a plurality of elongate elements held together in side by side relationship on top of a flat supporting bed. The elongate elements, which somewhat resemble matched boards and add only a few centimeters at most to the height of the bed, are formed by extrusion in desired lengths from plastic and have selected cross sectional shapes including passages permitting the circulation longitudinally through the elements of a temperature controlling fluid. By suitably selecting the plastic used in extruding said board-like elements the resiliency and hardness thereof, and hence of the floor as a whole, may be varied to fit different kinds of activities.