The invention relates to a ventilation unit (1) for providing supply air (SA), preferably outside air (OA) or fresh air, to an apartment or parts thereof and for removing return air (RA), preferably exhaust air (EA) or used air, from said apartment or parts thereof. The ventilation unit comprises a bypass valve (BV; BV∝) having a plurality of elongate members (EM; EM′) extending across a bypass duct and arranged in parallel next to each other, thus forming an arrangement of a plurality of elongate members next to each other as a one-elongate-member-thick layer. At least some elongate members (EM; EM′) of said plurality of elongate members (EM; EM′) are rotatably mounted around an axis of rotation (AR) parallel or identical to a longitudinal axis (LA) of said elongate members (EM; EM′). At least some elongate members (EM; EM′) are rotatable between a first rotational position or closed position (CP) and a second rotational position or open position (OP).

In a system for air-conditioning interior spaces of a building which are connected via at least one exhaust air duct, one or more interior spaces are provided with an air-conditioning unit which has a inlet line of outdoor air, which supplies inlet air or circulating air to the interior space or spaces, and which is connected to a fluid circuit of a heat pump. The exhaust air duct and a further fluid circuit of the heat pump are connected to an energy store installed outside the building, wherein the energy store is connected to a heat exchanger in a liquid reservoir for energy transfer and for energy storage, which is connected via the heat exchanger to another fluid circuit of the heat pump, the exhaust air being directed into the liquid reservoir via a heat exchanger.

In a system for air-conditioning interior spaces of a building which are connected via at least one exhaust air duct, one or more interior spaces are provided with an air-conditioning unit which has a inlet line of outdoor air, which supplies inlet air or circulating air to the interior space or spaces, and which is connected to a fluid circuit of a heat pump. The exhaust air duct and a further fluid circuit of the heat pump are connected to an energy store installed outside the building, wherein the energy store is connected to a heat exchanger in a liquid reservoir for energy transfer and for energy storage, which is connected via the heat exchanger to another fluid circuit of the heat pump, the exhaust air being directed into the liquid reservoir via a heat exchanger.

A liquid panel assembly configured to be used with an energy exchanger may include a support frame having one or more fluid circuits and at least one membrane secured to the support frame. Each of the fluid circuits may include an inlet channel connected to an outlet channel through one or more flow passages. A liquid is configured to flow through the fluid circuits and contact interior surfaces of the membrane(s). The fluid circuits are configured to at least partially offset liquid hydrostatic pressure with friction loss of the liquid flowing within the fluid circuits to minimize, eliminate, or otherwise reduce pressure within the liquid panel assembly.

A dedicated outdoor air system and method that is capable of operating over a broader spectrum of conditions. The HVAC system of the present invention utilizes a heating means positioned within the return air passageway in order to optimize the regeneration of the desiccant wheel and energy recovery device. By positioning a heating means upstream of the regeneration side of the desiccant wheel, the system is capable of providing supply air having low dew points to the enclosed space while still providing improved energy efficiency over conventional HVAC systems.

A dedicated outdoor air system and method that is capable of operating over a broader spectrum of conditions. The HVAC system of the present invention utilizes a heating means positioned within the return air passageway in order to optimize the regeneration of the desiccant wheel and energy recovery device. By positioning a heating means upstream of the regeneration side of the desiccant wheel, the system is capable of providing supply air having low dew points to the enclosed space while still providing improved energy efficiency over conventional HVAC systems.

The invention relates to an air filter assembly (1) for a heat recovery ventilation unit. The air filter assembly comprises a frame (2) and a filtering element (3) fixed within said frame (2). The frame (2) comprises a first frame portion (2a) having a first height; a second frame portion (2b) opposite said first frame portion (2a) and having a second height; a third frame portion (2c); and a fourth frame portion (2d) opposite said third frame portion (2c). The third and fourth frame portions (2c, 2d) each extend between said first and second frame portions (2a, 2b). The second height is greater than the first height of said first frame portion. A height of said third frame portion (2c) is comprised between said first and second heights; and a height of said fourth frame portion (2d) is comprised between said first and second heights.

An air conditioning system includes an outdoor air latent cooling treatment stage providing parallel airflow with a return air sensible cooling treatment stage. A mixer mixes the treated outdoor air with the return air to form the conditioned space supply air. A first relative humidity controller monitors the outdoor air relative humidity and separates the outdoor air from saturation to maintain relative humidity in outdoor air ducting below a predetermined mould growth limit. A second relative humidity controller monitors the conditioned space supply air relative humidity and separates the space supply air from saturation to maintain relative humidity in space supply air ducting below a predetermined mould growth limit. The outdoor air latent cooling treatment stage includes a dehumidification heat exchanger, combination pre-cooling and heat reclaim heat exchangers, or a heat transfer pump. The return air sensible cooling treatment stage includes at least a sensible cooling heat exchanger.

A fresh air plenum module (10) for attachment to a fan coil unit (12) for introducing air from an outdoor setting, wherein the fresh air plenum module includes: a first inlet (14) for connection to an outlet (24) of the fan coil unit; a second inlet (16) for connection to an air handling unit; an outlet (18) for discharge of the outdoor air and the conditioned air; and a merging volume (20) in communication with the first inlet, the second inlet and the outlet; in use, a flow of the outdoor air from the second inlet through the merging volume to the outlet generates a pressure gradient which induces a flow of air through the first inlet and into the fresh air plenum module from the fan coil unit.

A heat recovery unit with a unit housing (11) defining a unit compartment, a heat exchanger (20), a fresh air bypass flow passage and/or an exhaust air bypass flow passage, a fresh air centrifugal fan arrangement (41) and an exhaust air centrifugal fan arrangement (42), a fresh air filter (51) and an exhaust air filter (52).