Filling for heat exchanger

A heat exchanger for a heat pump, comprising

• a chamber for a working fluid;
• and
• a wall for heat exchange between the working fluid in the chamber and a substance in a space on the opposite side of the wall,
• said chamber comprising a structure of a filling material that is substantially non-absorbent with respect to the working fluid,
• said structure defining a plurality of channels for the working fluid, said channels at least partly being bound by the wall separating the chamber from the space,
• said channels providing passage for the working fluid from an inlet of the chamber to an outlet of the chamber,
• wherein the material comprises sand or quartz or grit or a polymer or a thermoplastic polymer of the group:
• polyoxymethylene copolymer, POM-C, or a polyoxymethylene homopolymer, POM-H.

A heat exchanger for a heat pump, comprising

• a chamber for a working fluid;
• and
• a wall for heat exchange between the working fluid in the chamber and a substance in a space on the opposite side of the wall,
• said chamber comprising a structure of a filling material that is substantially non-absorbent with respect to the working fluid,
• said structure defining a plurality of channels for the working fluid, said channels at least partly being bound by the wall separating the chamber from the space,
• said channels providing passage for the working fluid from an inlet of the chamber to an outlet of the chamber,
• wherein the structure is made up of a plurality of grains
• wherein the maximum distance between adjacent channels of the structure is between 0.3 millimeter and 1 millimeter, or the grains have an average diameter of between 0.3 millimeter and 1 millimeter, or the channels have a diameter of generally less than 1 millimeter in cross-section.

A heat exchanger for a heat pump, comprising

• a chamber for a working fluid;
• and
• a wall for heat exchange between the working fluid in the chamber and a substance in a space on the opposite side of the wall,
• said chamber comprising a structure of a filling material that is substantially non-absorbent with respect to the working fluid,
• said structure defining a plurality of channels for the working fluid, said channels at least being partly bound by the wall separating the chamber from the space,
• said channels providing passage for the working fluid from an inlet of the chamber to an outlet of the chamber,
• the heat exchanger further comprising a vessel for containing the working fluid, the vessel forming the chamber, wherein the chamber is bounded by a surface of a vessel wall and a wall of at least one tube, the vessel comprising an inlet and an outlet for transport of the working fluid into and out of the chamber;
• said at least one tube forming the space for the substance, of which at least one tube portion is inside the vessel, wherein a first end of the tube portion is fixed to a first orifice of the vessel and a second end of the tube portion is fixed to a second orifice of the vessel to enable fluid communication into and/or out of the tube portion through the first orifice and the second orifice;
• wherein the chamber outside said at least one tube is filled with the structure;
• wherein the at least one tube portion has an outer surface in contact with the structure;
• wherein the at least one tube portion is arranged in a plurality of windings around a wall portion of said vessel wall and around a region external to the chamber.