Alnor Ventilation Systems

Alnor Mechanical Ventilation Systems

ALNOR, based in Poland, started its activity in the market in 1994 as a producer of mechanical ventilation products. A young and dynamic team ensured the company progressed and now employs over 500 employees. The product offerings include different types of units for Apartments, Houses, and Commercial properties, complimented with all components relevant to designed systems. The company also includes a Passive House MHRV unit.

Understanding MVHR Systems

Heat recovery ventilation is also known as mechanical ventilation with heat recovery (MHRV). The ventilation system is used to extract stale air from the rooms and replace it with fresh and filtered outdoor air while a significant part of the energy consumed to heat the house is recovered and transferred again to the premises.

The whole process exhausts air from the so-called wet rooms like kitchen, laundries and bathrooms and supply fresh air into all habitable rooms and bedrooms. The proper operation of natural ventilation depends on weather conditions and house airtightness.

Importance of Mechanical Heat Recovery Ventilation

In details, during spring-summer season, when the temperature difference between indoor and outdoor air is rather small the air flow is reduced. In autumn-winter season natural ventilation should operate properly if we assure the inflow of outdoor air to the premises, but the consequence will be a heat loss.

Mechanical ventilation with heat recovery (MVHR) still in many markets is only an alternative for natural ventilation as a primary solution, however, it becomes more and more popular every year. Why is it so? Properly designed and correctly mounted heat recovery ventilation system guarantees effective air exchange in the house all year round. In addition to the above, outside air is filtered before it is introduced to the buildings. Air filters are standard equipment for heat recovery units. Moreover, if the outside air quality is poor, an anti-smog duct air filter can be additionally mounted before heat recovery ventilator.

The units are able to recover up to 90% of heat. How does it work? In the MVHR system, we have two airflows (supply & exhaust) that pass one another parallelly within the heat-recovery ventilator without mixing physically. In the unit's heat exchanger, heat from "stale" extracted air from the house is transferred to the "fresh" air brought from outside.

The heat recovery system is widely used all over the world, as it perfectly suits the energy efficiency trend. If you are planning to build an energy-efficient, mechanical ventilation with heat recovery is a mandatory choice.

What are the Heat Recovery Ventilation Types?

We can divide mechanical ventilation systems with heat recovery into two groups depending on the type of heat recovery unit and solution of air distribution ductwork.

Centralised heat recovery unit is used to ventilate the whole building (house), flat, or group of flats. Such units are usually connected to supply and extract ductwork system which distributes fresh air from outside and extract stale air from the premises recovering heat as well.

The second group represents decentralised ductless heat recovery units, to ventilate homes that have no roof cavity. Lunos is a brand from Germany where we offer a range of products for New Zealand. They have a compact design, low airflow capacity, ceramic core, and no need to install supply and extract air ductwork.

The "push-pull" units are based on the changeover cycle between supplying and extracting air at the same time (ex. 50 seconds cycles). This kind of unit can be connected in bigger systems to synchronise the operation (one unit works in supply mode, second in extract mode). The compact design is a great advantage in retrofit projects in old houses.

How MHRV Works

A heat recovery unit is nothing else than an air handling unit equipped with a heat recovery exchanger. It is designed for efficient and effective air exchange in the premises, in other words, to extract stale and supply fresh air. At the same time, it recovers heat from extracted air. 

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