A heat exchanger apparatus for temperature regulation in a building an inlet section with a wedge-shaped inlet channel having a wide opening at an air inlet and a gradually narrowing cross-section. The inlet channel has a side-opening towards a heat exchange section. The heat exchange section has plate-shaped phase change material modules mounted in an inclined stacked formation forming a series of air channels between the PCM modules extending from the inlet section to the wedge-shaped outlet section so that the airflow is gradually redirected from the inlet section and into the air channels of the heat exchange section. The heat exchanger with PCM plate modules has a low pressure drop meaning low additional energy consumption, and the heat exchanger has a very even airflow offering a system that provides effective cooling until all energy stored in the PCM plate modules is dispatched.

A two-part reversible air deflector for reversing the flow direction of air pumped by a radial fan with constant rotation direction and a ventilation system formed of ventilation installations with use of reversible air deflectors, wherein the air deflector is divided into the suction-inlet body and the separate compression-outlet body, each of them having the frontal through opening surrounded with an annular protrusion wherein both bodies and of the deflector are arranged opposite a fixed partition having a round through opening with its edge of a funnel outline surrounded on two sides with a pair of annular protrusions in such a manner that the common axis X of frontal openings of the bodies is aligned with the axis of the round opening of the partition.

Heat exchanger (100) designed as a gas-solid body heat exchanger includes at least one support (10, 15, 20) having a multiplicity of heat exchanger rods (30) arranged on the support, wherein the heat exchanger rods extend like rays from the support.

An air conditioning appliance may include an air plenum, a recovery casing, a first recovery exhaust fan, a heat exchanger core, and a thermal cutoff. The recovery casing may be attached to the air plenum. The recovery casing may define an outdoor casing inlet downstream from the air plenum and an indoor casing outlet downstream from the outdoor casing inlet along an external recovery flow path. The recovery casing may further define an indoor casing inlet and an outdoor casing outlet along an internal recovery flow path. The first recovery exhaust fan may be mounted within the recovery casing along the external recovery flow path. The heat exchanger core may be disposed along the external recovery flow path and the internal recovery flow path. The thermal cutoff may be mounted within the recovery casing in operable communication with the first recovery exhaust fan.