Páraszabályozott szellőzés

The humidity-controlled MEV, a high performance solution at optimal cost

 

The humidity-controlled MEV system offered by Aereco, also called DCV for Demand Controlled Ventilation, is a mechanical extract ventilation system with room-to-room airflow modulation, depending on need. It is mainly used in residential buildings. For the tertiary sector, especially schools, offices and hotels, adapted solutions are offered by Aereco. This system combines energy performance and indoor air quality in an inexpensive solution that can easily be implemented in both new constructions and renovations.

To guarantee the airflows set at design stage, the humidity-controlled MEV is the most popular Aereco solution across the board, from social landlords to private owners. By offering a humidity-controlled air supply in dry rooms and air extraction depending on humidity or presence in wet rooms, the humidity-controlled mechanical extract ventilation system offers intelligent airflow management in all rooms.

This system can be used for communal management (multi-family buildings) by means of a common central fan, or individually with a fan per dwelling (multi-family buildings or individual houses).

The MEV functioning, short reminder

 

Before the invention of humidity-controlled ventilation, the operation of which involves modulating flow rates depending on internal humidity, self-adjusting ventilation was very widespread in France in particular. This system usually consists of a self-adjusting air inlet located in each dry room, and a self-adjusting exhaust unit for extraction in each wet room. The self-adjusting air inlet, generally installed on a window, makes it possible to limit the variations of pressure dependent air flow, making it less sensitive to the effects of wind. The self-adjusting exhaust unit works in a similar way, since to some extent it also controls the flow of extracted air by limiting the effects of network pressure variations, which allows an almost identical flow at each self-regulating vent regardless of the level in the building for collective housing.

The self-adjusting air inlet generally incorporates a movable pressure-operated flap acting on the air passage section. The self-adjusting exhaust unit generally has a bellows whose volume is influenced by the pressure, again varying the section of passage.

If the installation of self-adjusting air inlets and self-adjusting vents in the rooms of a dwelling provides better control over the pressure than purely passive components with constant sections, the performance of the self-adjusting ventilation remains clearly lower than that of a humidity-controlled ventilation system since its flow rates are not adapted to the needs.

How does humidity-controlled MEV work?

 

In terms of a communal treatment for apartments, the renewal of air in the homes is provided by a single fan that can be placed directly on the roof or other outdoor area. For individual treatment (houses or apartments), the fan is located in the attic or inside the dwelling, depending on the space available.
Inside the home, the humidity-controlled MEV works by removing the stale air through the humidity-controlled exhaust units located in the wet rooms (kitchen, bathroom and toilet), which generates the renewal of the air for the entire dwelling. The role of humidity-controlled air inlets is to distribute the fresh air according to the needs of each dry room (bedrooms and living rooms).

 

Humidity-controlled MEV: optimal management of indoor air quality

 

The Aereco humidity-controlled MEV has been designed to optimise indoor air quality thanks to its intelligent air inlets and exhaust units that automatically detect the need for ventilation. For example, during the night, the humidity generated by the occupants in the rooms is detected by the air inlets which then increase the airflow to maintain a good indoor quality. During the day, the humidity generated by a shower for instance is detected and evacuated by the extraction unit, whose air flow is automatically activated to the maximum.

 

 

Energy savings on both heat loss and power consumption

 

The intelligent airflow management offered by the Aereco humidity-controlled MEV automatically adapts the ventilation in any room to the needs at any time. When the dwelling has low or zero occupancy and indoor air quality is good, the air flows are automatically reduced, retaining the heat in the heating season and reducing the fan’s energy consumption. Depending on the conditions, this system can reduce ventilation-related heating consumption by between 25% and 50%; and likewise for the power consumption of the fan.

Incredible cost-performance with the Aereco humidity-controlled system

 

One of the reasons why the humidity-controlled mechanical extract ventilation system has become so popular is its incredible cost-performance ratio. Indeed, although the humidity-controlled MEV is a bit more expensive than the regular MEV, the financial savings created by the much higher performances of the humidity-controlled MEV quickly allow to reach the return on investment. Thus, the humidity-controlled MEV is the perfect solution for anyone looking for effective solutions that are easy to implement in residential applications.

Ideal for renovating and improving the performance of an existing MEV installation

 

The Aereco humidity-controlled MEV uses the same air inlets slots and exhaust units’ spigot sizes as standard mechanical extract ventilation systems. This means that replacing a MEV system with a humidity-controlled MEV system is very simple. The air inlets and the exhaust units can be directly replaced, without the need for additional work. Normally no new cabling is needed: the humidity sensor of the air inlets and exhaust units is mechanical (no electricity) and the other activation modes of the exhaust units can be mechanical or battery operated.
The fan(s) must be changed to obtain a constant pressure, as offered in the Aereco range. There is no need to balance the ducts or adjust the components: the system automatically adjusts the airflows.