Single room heat recovery units are also referred to as wall heat recovery units, ductless
HRUs, push-pull units, etc. This type of heat recovery unit is recommended when
the traditional mechanical ventilation system with heat recovery cannot be installed,
e.g. when there's no space for the network of ductwork.
Wall heat recovery units are often mounted in an existing, older building, especially for retrofitting, refurbishment applications. Room heat recovery units are recommeded when the issue of poor air quality arises due to not working gravity ventillation system. Poorly working natural ventilation system often leads to high indoor humidity and the risk of mould growith.
In comparison to wholehouse ventilation system, where the unit is installed in utility room like a laundry room, single room heat recovery units as the name suggests must be
installed in every room separately. It's recommended that the units are installed in pairs, so the one unit supplies fresh air, while the other one removes extracted air.
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HRU-WALL is a single-room decentralized heat recovery unit for concealed installation. The wall mounted heat recovery unit comes with a ceramic heat exchanger which boasts a maximum heat recovery ratio of 90% (the nominal heat recovery ratio is η=74.3% as per EN 13141-8:2011).
How does it work?
The energy-efficient EC fan changes the running direction every 70 seconds to alternate between air supply and air exhaust. Low energy consumption and extremely low operating noise make this heat recovery unit a recommended
How to select the single room heat recovery unit?
HRU-WALL-100-25 model provides a sufficient air change level in areas up to 19m2.
|Single Room Heat Recovery Units for through-wall installation|
The heat exchanger material together with its unique honeycomb structure gives
The casing is made of ABS. The operating principle is analogous to HRU-WALL - unit is working in alternating flow mode, switches the air flow directions every 40-120 seconds
The RC version has several advantages:
|Push-pull heat recovery unit with remote control|
What makes this model unique? Convenience. HRU-WALL-WI single room ventilation units have a Wi-Fi module built in, which enables wireless control of the units. You need to download the free WallAIR app on your smartphone or tablet to operate them.
With the addition of a Wi-Fi module, the device can be connected to a local wireless network and controlled via a mobile app. Moreover, the app allows the pairing of devices by assigning two or more heat recovery units to a group. It is possible to have many groups so that 1 application can serve all HRV units in a building.
If we struggle with high levels of humidity in the apartment due to poorly functioning gravity ventilation, we might also consider a single room heat recovery unit. A temperature and relative humidity sensor is integrated into HRU-WALL-WI heat recovery units so we can monitor the humidity with the WallAIR app.
Single-room heat recovery ventilation is most effective when two units are mounted in two opposite rooms, both units assigned to the same group in the application. The above configuration allows devices to be synchronized for alternate operation (while one unit supplies air, the other extracts). Synchronization is completely wireless (WiFi), which minimizes installation costs.
|Single room heat recovery unit with Wi-Fi module|
A window reveal module for the decentralised heat recovery units - HRU-WALL series. The module is intended for installation in the facade, in the insulation layer, a ventilation grille is mounted on the window reaveal. The window reveal module provides practically invisiable solution for supply/extract ducting. This method of installation will be especially useful during the thermal modernization of the building. The product has a universal layout, the choice of "right-sided" or "left-sided" assembly is made at the construction site. In addition, a slope for possible condensation growth was implemented into the design.The duct is telescopic, which means that the distance from the axis of the HRU to the window reveal can be adjusted in the range of 380-490 mm.
|Window reveal module for single room heat recovery units|