Rotary wheel regenerator are described that use polymer, paper, metallic or other substrate having a parallel-plate heat transfer surface or media configuration. The substrate media can be either non-desiccant-coated sensible substrate, or enthalpic desiccant coated substrate. In exemplary embodiments, the spirally wound substrate media strips are arranged in a parallel plate manner using an embossed formation periodically to hold the strips in a parallel plate configuration. The strip layers are arranged so that every other layer is embossed and every other layer is without embossments. The embossed standoffs are not required to be aligned with one another periodically, and a parallel plate arrangement is achieved.

A heat recovery wheel for a heat exchanger includes a wheel rim defining an outer perimeter of the heat recovery wheel, and a plurality of wheel passages located between the wheel rim and the wheel axis. The plurality of wheel passages are at least partially defined by one or more passage fins. At least a portion of a passage fin of the plurality of passage fins extends non-parallel to the wheel axis between a first wheel end and a second wheel end. The plurality of wheel passages are configured for flow of a first airflow and a second airflow therethrough for thermal energy exchange between the first airflow and the second airflow.

A support structure for a rotary regenerative machine or rotary absorption machine (RAM), the support structure including an upper stator and a lower stator axially spaced apart from one another by a first segment of at least two pedestals, the first segment of each pedestal extending between the upper stator and the lower stator, and an upper rotor bearing housing mount disposed above a lower surface of the upper stator, the rotor bearing housing mount is attached to the upper stator by at least one radially extending bearing support structure, wherein a radially inner end of at least one of the radially extending bearing support structure is attached to the bearing housing mount and a radially outer end of the at least one radially extending bearing support structure is proximate a top portion of the first segment of each of the pedestals.

A rotary thermal wheel assembly for heat transfer, mass transfer or a combination of heat and mass transfer has a hub, a number of rigid spokes which are connectable to the hub, and a heat and/or mass transferring media pack. The media pack is arranged in the space defined by the hub and the spokes. The hub is a tubular element provided with connection means, and the spokes are connectable to the hub by connection parts which match the correspondingly shaped connection means of the hub.

A heat transfer sheet for a rotary regenerative heat exchanger includes a plurality of rows of heat transfer surfaces each being aligned with a longitudinal axis extending between first and second ends thereof. The heat transfer surfaces have a height relative to a central plane of the heat transfer sheet. The heat transfer sheet includes one or more notch configurations for spacing the heat transfer sheets apart from one another. Each of the notch configurations are positioned between adjacent rows of heat transfer surfaces. The notch configurations include one or more lobes connected to one another, positioned in a common flow channel and extending away from the central plane and one or more lobes extending away from the central plane in an opposite direction and being coaxial. The lobes have height a relative to the central plane that is greater than the height of the heat transfer surfaces.

A fluid direct contact heat exchanger having a contact chamber with a source fluid inlet provided by a source fluid inlet pipe, a source fluid outlet provided by a source fluid outlet pipe, a transfer fluid inlet provided by a transfer fluid inlet pipe, and a transfer fluid outlet provided by a transfer fluid outlet pipe. The source fluid and the transfer fluid have substantially different specific gravities and the source fluid and the transfer fluid are each insoluble in the other. The heat exchanger incorporates a heat transfer inducement element in the contact chamber which has a rotatable inducer shaft and a transfer accelerator element attached to the inducer shaft.

A heat recovery wheel for a heat exchanger includes a wheel rim defining an outer perimeter of the heat recovery wheel, and a plurality of wheel passages located between the wheel rim and the wheel axis. The plurality of wheel passages are at least partially defined by one or more passage fins. At least a portion of a passage fin of the plurality of passage fins extends non-parallel to the wheel axis between a first wheel end and a second wheel end. The plurality of wheel passages are configured for flow of a first airflow and a second airflow therethrough for thermal energy exchange between the first airflow and the second airflow.

The purpose of the present disclosure is to solve the problems of a difficult operation or occurrence of corrosion damage to equipment caused by the attachment of ammonium sulfate salt, which is generated when unreacted ammonia (NH.sub.3 slip) and sulfur trioxide (SO.sub.3) in exhaust gas are bonded with each other when a selective catalytic reduction (SCR) is used to eliminate nitrogen oxides that are contained in the exhaust gas generated during the combustion of a boiler or the like, to a heat exchanger of an air preheater (APH) or the like installed at the rear of an SCR device and blocks a passage of the exhaust gas such that the pressure inside the boiler is increased. To this end, a dry ice cleaning device is installed at the front of an exhaust gas inlet in an air preheater such that the blocking of a heat exchanger caused by ammonium sulfate salt or the like is removed by spraying dry ice pellets, and at the same time, high-temperature steam spraying device is installed at a cold end of the air preheater so as to spray the steam in the same direction as that of air supplied to a boiler, thereby removing contaminants more effectively. Furthermore, in order to effectively prevent blocking which occurs in a cold end of the air preheater, dry ice is sprayed to the front of an exhaust gas inlet of the air preheater and also, to the front of a supply air inlet of the air preheater which is an opposite direction thereof, such that a cleaning effect is increased.

According to an example aspect, there is provided a matrix for a heat exchanger, which matrix is made of heat absorbing material and has a plurality of fluid flow channels extending there through in a flow direction of fluid. The flow channels have channel sections that are successive in the flow direction and at least partly staggered relative to each other.

The disclosure relates to the field of ventilation systems, specifically to ventilation systems in residential and non-residential (commercial) buildings. Specifically, the invention relates to decentralized supply and extract units with waste heat recovery and can be used for transmitting heat and power from an extraction air flow, i.e. from a flow of air extracted from a building, to a supply air flow, i.e. a flow of fresh air being drawn into a building, for the purpose of replacing spent air from the building.