F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
F25B41/00—Fluid-circulation arrangements
F25B41/30—Expansion means; Dispositions thereof
F25B41/37—Capillary tubes
F25B41/375—Capillary tubes characterised by a variable restriction, e.g. restrictors made of shape memory alloy