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Heat recovery ventilation (MVHR)

Delta T are here to help you comply with government and building regulations changes to make homes more airtight and energy efficient, the ventilation requirements of a home have become more important than ever before. Inadequate ventilation can cause a build up of pollutants that can be detrimental to the health of home owners.

In fact, the issue is so important that an entire section of the Building Regulations is dedicated to ensuring adequate ventilation is available in properties. With each person on average producing 10 to 75 litres of carbon dioxide and 175 grammes of water vapour per hour, the correct ventilation is essential to maintain the health and well being of your family.


It's important for your property to breathe, especially when it's super insulated and airtight for maximum energy efficiency. But if 'breathing' means dumping warm air to replace it with cold air just to remove moisture, dust and odors, then there has to be a better more efficient way to ventilate a building, hence the need for heat recovery ventilation.


On new homes a pressure test is required to show that the home meets the low level of air leakage required. All of this is easily undone by the conventional use of trickle vents and extract fans for ventilation.


A heat recovery ventilation system fitted by Delta T maintains the air tightness of the structure whilst providing continuous balanced ventilation throughout the dwelling. The energy efficient, healthy way to ventilate.


For every 1850 KW of electricity generated by a fossil fuelled power station one tonne of CO2 is released into the atmosphere. The quickest and easiest way to cut your carbon footprint is to reduce energy usage by using the latest heat recovery ventilation.

 

How does MVHR work?


Heat recovery is a ventilation system that removes moist warm air from such areas as bathrooms and kitchens, the warmth of the exhaust air is used to heat the fresh intake ambient air from outside the property and supplied to such areas as the bedrooms and living rooms. This is achieved by the use of a cross over cell / heat exchanger.

Heat recovery ventilation systems when in normal operation omit a very low level of noise that is not normally noticeable against the back ground noise of normal everyday living. When in boost mode the system is slightly louder for the period of boost then returns to normal operation.


Heat recovery systems should be installed with rigid ducting and are normally hidden within the property usually in the loft or a utility cupboard... It is therefore essential that the ducting runs and integrity of the system are well designed before installation.

The central air unit incorporate filters for dust removal on both extract and fresh air supply. The washable filters protect the heat exchanger from the build up of dust and from grease and other particles in the stale air. Frequency of cleaning of the filters is dependent on the level of contamination but typically would be an annual operation.


Why you should consider a change to whole house heat recovery ventilation.

 

1) Whole House systems are more efficient and can represent significant savings in both energy and CO2 emissions. Mechanical ventilation with heat recovery (MVHR) systems means less energy usage and carbon output, saving homeowners money whilst reducing their carbon footprint.


2) Whole house systems can negate the need for individual fan units in bathrooms, toilets, kitchens and utilities, improving the aesthetics of these areas where ventilation is required. The central heat recovery unit also fits discreetly into an airing or loft space and the air is filtered by ducts hidden away, improving the acoustics of the overall system.


3) MVHR systems are designed to return up to 95% of the heat that would be lost by normal ventilation systems. They do so by passing extracted air over a heat exchanger and transferring it to the incoming air supply. This reduction in heat loss results in a home needing to be heated less in the winter months, whilst the ventilation ensures you are kept cool in the summer. In this way, MVHR gives you the best of both worlds..


4) When it comes to indoor air quality nothing works better than a whole house system. As homes become more airtight they are less able to breathe, meaning that they cannot affectively expel polluted, stale air, which can also increase the risk of condensation build up. The constant flow of mechanical ventilation ensures that these pollutants and water vapour are removed and replaced with fresh, clean air resulting in a healthier environment for home owners. This also removes excess condensation that can cause moulds and fungus to grow, threatening the fabric of a building and the health of the occupants.


5) It can be quick and easy to install. A trained engineer can usually fit a whole house system in roughly 3 days into a new build property. Whilst the cost depends on the size of the property and the amount of ventilation it requires, the savings on running costs, improved air quality, health benefits and reduction in CO2 emissions makes it all worth while.
Contact our help desk at Delta T where we will be pleased to offer you a complete start to finish service for all your needs.

Call us today on 0800 587665

Delta T the number one installer and maintainer of heat pumps in Essex and London
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