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Mechanical Ventilation with Heat Recovery (MVHR) systems, such as the Airflow Adroit, are fantastic systems to have installed in your home, as they can help you save on your heating bills by recovering heat that would otherwise be lost via the extraction process and resupplying this recovered heat around the home. However, during the hot summer months, you obviously don’t want to be supplying hot air around your home, which is when a bypass facility comes into play.
Mandatory under the ErP Ecodesign Directive, heat recovery systems must now come with a bypass facility to prevent overheating within your home during the summer months. Currently, there are two types of summer bypass facility that can be used within a MVHR system: thermal (partial) and 100% (total).
Thermal bypass facilities, as seen in the Airflow DV72, work by slowing the supply fan down to a minimum when the temperature sensors reach a predefined temperature. By slowing the supply fan down to a minimum, the amount the amount of air going through heat exchanger is limited, whilst still providing enough ventilation to your home. By limiting the amount of supply air going through the heat exchanger, there will be less heat recovered from the extract air and in turn will limit solar gain and overheating within the home during the summer months.
However with thermal summer bypass facilities; there is the risk that partial heat recovery may still take place. This means that your home may be unnecessarily warmed as a result of this heat recovery, which in turn could lead to overheating of your home.
100% summer bypass facilities, as found in both the Airflow Adroit and Airflow Entro ranges, engage when the temperature sensor within the unit exceeds a predefined temperature. When the sensor reaches this temperature, the facility prevents the outdoor air entering the heat exchanger. The heat exchanger is isolated by the use of a flap which prevents the supply air reaching it in many instances. The supply air instead bypasses the heat exchanger and is just filtered before entering the home. By bypassing the heat exchanger, this helps to minimise any overheating and solar gain during the warm summer months.
By possessing a 100% summer bypass facility, the heat exchanger is isolated and the risk of unnecessarily warming the incoming air is totally removed. By preventing unnecessary heat recovery in the summer months, the risk of overheating your home during the summer months is greatly reduced.
For too long, commercial MVHR system installations have been plagued with bulky and unsightly systems and ducting, which can ruin the design of a modern building.
Often requiring a lot of ducting, with much of it going around the outside of the unit, causes a lot of the heat that is recovered by the specified MVHR system to be lost – increasing energy costs and lowering the efficiency of your ventilation system. Not only this, the MVHR system can be quite noisy as a result of the system having to work harder to effectively circulate the air around complex ducting systems.
However, the unique design of the Duplexvent Multi-N allows the ventilation system to run at a lower static pressure, as less ducting and a less complex ducting system is needed for it to run efficiently. By running at a lower static pressure, the Multi-N system is able to move the air around the system easier than traditional commercial MVHR systems and is the quieter ventilation system option for the building.
Specifiers are now able to specify a ventilation system that is in keeping with overall design of the building and uses less room than traditional MVHR systems. Multi-N’s unique, compact design, which houses the ducting internally, limits the amount of room used by the MVHR system and uses significantly less than the traditional systems. The Multi-N is more discrete and is easier to have integrated to the overall design of the building than traditional MVHR systems, meaning that the aesthetic appeal of the building isn’t diminished by an overbearing ventilation system.
The Multi-N’s quick install time lowers installation costs, which allows the owner to recoup their initial outlet more quickly when compared to MVHR systems that require more parts and more complex ducting systems. This is due to the Multi-N’s unique design that allows for quicker install times than traditional MVHR system.
The cost savings don’t end there, by recovering over 90% of the heat that would otherwise be lost from the building, and reusing it to pre-warm the incoming air, the Duplexvent Multi-N reduces the time the building’s heating system is on and in turn reduces the energy bills for the building.
The Multi-N grants you greater control and provides customisable ventilation through its 10 speed digital control that can integrate into any Building Management System via the Modbus protocol. Thanks to Multi-N’s internet capabilities, you can remotely connect to the system and monitor and adjust its performance. This ability to remotely connect to the unit can also translate to reduced maintenance costs, as with the owner’s permission, a ventilation maintenance specialist can remotely connect to the system and identify the cause of any issue; reducing maintenance call out costs. The ongoing running costs are also reduced, as it is quicker and easier to access the relevant components for the Multi-N compared to other systems; reducing maintenance call out time costs.
The Multi-N adds to the building’s appeal by providing a virtually unnoticeable ventilation system. Operating at just 48 dB(A), the tenants won’t be distracted by the constant noise that can occur from alternative units and also makes the building more appealing to prospective tenants.
The occupants of the building benefit from the Multi-N, as they receive improved indoor air quality, which has been found to improve worker performance and productivity. The health of the occupants is also protected thanks to the Multi-N’s filter system removing many of the airborne pollutants that are found to have a negative impact on human health.