MVHR

The MVHR unit provides trickle ventilation, heat recovery ventilation and secure night time cooling.  It also boosts levels of ventilation during summer or during periods of high CO2.

The MVHR unit can complement natural ventilation provided by being integrated with manual or automatic windows/louvres, either via a single sided or cross flow ventilation strategy.

The system comprises an intelligent and fully automatic control system which switches between operational modes dependant on external/internal temperature conditions and indoor air quality (IAQ).

The MVHR system can be installed in a range of exposed or concealed locations, such as direct façade or ducted applications. 

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Key Features

  • Control options include: CO2, PIR, VOC, BACnet, modbus and BMS integration
  • Low temperature hot water (LTHW) heating available 2KW-12KW
  • Filter options including M5, F7, F9 (with G3 as standard)
  • Pre-heater option for low temperatures
  • Acoustic shrouds and fascias for below ceiling non-ducted applications
  • Attenuation pods
  • Colour options
  • Weatherproof housings

How the MVHR unit works

The MVHR unit extracts stale air from a building recovering the heat or cool energy through the membrane heat exchanger core and transfers it to temper the fresh incoming air.

The heat exchanger is the core element within the MVHR unit and enables exchange of both latent heat (humidity/moisture) and sensible heat (temperature). It is designed to maximise heat recovery by being made of an ultra-thin membrane and by being constructed in a cross flow format. It is also constructed to prevent supply and exhaust air streams mixing and ensure only fresh air is introduced into a building. 

As the heat exchanger achieves a high enthalpy exchange efficiency and has high moisture permeability, it removes the requirement for a condensation drain. 
Combined with accurately controlled fans and dampers, a comfortable internal environment can be attained whilst energy consumption is minimised.

Ventilation Modes

Heat Recovery Mode
When fresh air is required in the winter season, the MVHR draws heat energy from the exhausted air and uses this energy to preheat the cooler fresh air before it enters the room.

It has been demonstrated that if the air within the space is 20°C and the external air being drawn in is 7°C, the MVHR will be able to supply fresh air at 14.5°C and therefore this air only requires heating by 5.5°C to be brought back up to room temperature, rather than the 13°C of heating that would be required should the fresh air be brought directly into the space. Similarly, if the air within the space is 20°C and the external air being drawn in is 24°C, the MVHR system will be able to supply fresh air at 21.7°C.

Night Purge
During the summer season, when the external night time air is a lower temperature than the internal air, the MVHR system will provide night time cooling until the space is cooled to a pre-set temperature. It is possible for the system to provide this cooling at a greater flow rate than during the day time as noise restrictions are not in place. This purge effect helps to reduce the temperature of the fabric of the building and reduces the load on any cooling systems at the start of the day.

Summer Bypass Mode
When fresh air is required in the summer season and the external air temperature is lower than the outside temperature, the MVHR draws fresh air directly into the space. When used in conjunction with Monodraught’s Acoustic shroud and grille, this cooler fresh air is introduced to the space at a 45° horizontal angle from the system pushing it around the room. At the same time, warm stale exhaust air is drawn into the system at the opposing angle creating a circular air plume within the space.

MVHR Case Study - OLOG Project

Monodraught were asked to provide a mechanical ventilation solution to Our Lady of Grace School, Charlton, London.

In November 2016, fourteen Monodraught MVHR-100 systems were installed to the new build classrooms of Our Lady of Grace School, Charlton, London.
These systems were install by Monodraught on behalf of Galliford Try and were Monodraught’s first MVHR project, initial feedback has been positive.

The systems were supplied to simultaneously supply tempered fresh air to each classroom ensuring the correct oxygen levels were maintained whilst stale air is expelled. The air quality was ensured by the use of Monodraught’s bespoke integrated CO2 sensor.  Additional summer time ventilation can be provided via the manually openable windows within each classroom.

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