Abstract: A spacer (100) for providing space between a first roof member (110) and a second roof member (120), where the spacer limits compression of an insulator (130), the insulator (130) being at least partially between the first roof member (110) and the second roof member (120).

Abstract: A spacer (100) for providing space between a first roof member (110) and a second roof member (120), where the spacer limits compression of an insulator (130), the insulator (130) being at least partially between the first roof member (110) and the second roof member (120).

Abstract: An absorption refrigeration system utilising a pair of refrigerant fluids one of which constitutes a distillate, the other of which constitutes an absorber, the fluids being separated from one another in a closed circuit, by a distillation process, the more volatile vapor phase (namely the distillate) being condensed to form a liquid phase, expanded, evaporated, and re-absorbed in the less volatile product (namely the absorbent) of the distillation process, each of the refrigerant fluids being a fluoro-carbon compound, the differences of respective boiling points of said pair of fluids being substantially smaller than the corresponding boiling point temperature difference pertaining to the ammonia/water absorption system, the system being characterized in that it is able to operate with a higher temperature cooling medium for the distillation column condenser while utilizing a lower grade of heat in the distillation column re-boiler.