ហេតុអ្វីបានជាអ្នកគួរប្រើផលិតផលសម្អាតធម្មជាតិ Uncategorized Automated home 2.0 – #15 The Mechanical Ventilation heat recovery (MVHR) System

Automated home 2.0 – #15 The Mechanical Ventilation heat recovery (MVHR) System

Our mechanical first fix is practically complete so it’s a good time to look at our MVHR system.

When spec’ing our first self-build in the late 1990’s we added this Drimaster PIV unit (Positive Input Ventilation).

This sent a low pressure feed from a vent in our hall ceiling, driving moist air out of the house and doing away with the requirement for trickle vents on all our windows and extractor fans in the wet rooms. Although it worked well, the down side was that as it pushed out our warm heated air, it drew in cold air from outside to replace it.

We knew we wanted a much more efficient system in the new house and so we looked around for a company with knowledge in low energy heating. We were lucky to find an expert best on our doorstep and back in February of 2017 we had our first meeting with Daly Renewables.

Daly’s describe themselves as “an engineer-led company committed to developing low energy efficient renewable energy systems”. We liked the fact that they are, as they put it, “a single point Responsibility”. We weren’t talking to a sales team either, but the engineer that would be developing our system.

An MVHR is effective in homes with an airtightness rating of around a 5 or lower but what exactly is it? ទៅ Ryan សម្រាប់ការពន្យល់ជាច្រើនទៀត …

[UPDATE – here are the figures for our first years running cost]


The minimum form of ventilation currently required to satisfy building control is a combination of trickle vents and extract fans. A trickle vent is the most basic form of ventilation and consists of a slot opening in a window which can be manually opened and closed to let fresh air straight in from outside. This is uncontrollable and the problem with these occur during a cold windy night when you get a cold draught from the vent entering the room, which affects the comfort of the occupants. combined with extract fans in bathrooms, it begs the question – why insulate your home so well and leave what are efficiently holes in your walls and windows?

When we tighten a house to decrease energy consumption, we also risk making the building envelope susceptible to moisture problems, including mould (a major health issue) and rot. Excess indoor humidity can also increase dust mites and other allergens, damage electronic equipment and accelerate the outgassing of formaldehyde from common building materials and furnishings. If the house is in an area prone to ground radon, then radon accumulations can also increase in a tight house that is not correctly ventilated (though separate radon mitigation is much more effective at decreasing this risk).  A tight enclosure with mechanical ventilation will practically always offer better indoor air quality with lower energy bills and much more comfort than a leaky house depending on the house to “breathe”.  houses don’t breathe – people breathe and they do it 24/7 year around. An essential aspect of thermal comfort is humidity levels and directly related air quality.

Quite simply put- the better insulated and sealed a house is, the much more essential a controlled form of ventilation becomes.  
Ryan Daly

A better Way

The many efficient and effective type of ventilation is mechanical ventilation with heat recovery. In this system a pre-calculated flow of air is extracted from wet rooms, removing moisture, odours and VOC (found in paints, adhesives etc).

A supply of air is accurately placed into habitable rooms, ie each and every bedroom and living areas. A high efficiency heat exchanger recovers up to 90% of the heat energy in the extracted air into the incoming filtered fresh air.

We have fitted this Vent-Axia Sentinel Kinetic High flow unit into the new Automated Home. once it’s setup it requires little or no adjustment with an automatic summer bypass and a built-in humidity sensor that boosts the fan speed when it detects an increase in moisture (for example when taking a shower).

To it we have connected the Hybalans Ducting System and this routes the supply, as well as the discharge of ventilating air with the highest possible energy saving and maximum convenience.

Early planning is really beneficial here, so ensuring your Architect, Mechanical expert and Builder all know the site for the MVHR and the routes your ducting will take.

It consists of 2 manifolds, 1 for supply and 1 for Extract. The ducting is 92mm Semi rigid Plastic which runs to each individual room. The main advantage of this system is that it is very easy to balance, especially compared to a conventional teed off system which can be very hard to get the air flows appropriate on. The air quantities per air valve are simply centrally adjusted in the air distribution boxes. adjustment of the air valves is unnecessary.

Due to low resistance losses, the working
point and fan motor rpm of the HRV unit are reduced. This creates an extra
reduction of the system noise.

We thoroughly select the MHRV unit to guarantee that the operating capacity of the System is in or around 50%, or less where possible.

several years we have been installing HRV into an enhancing number of homes,
with this system having several benefits over others:

Negates the need for trickle vents and extractor fans.
System sized to offer 0.75 Ach (Air changes per Hour).
Double skinned steel unit with 25mm Insulation surrounding- ultra quiet in operation.
Counterflow heat Exchanger – up to 90% heat recovery.
Hybalans Radial ducting system developed to negate crosstalk between adjoining rooms.
Automatic summer Bypass.
Energy saving EC fans (electronic commutation technology).
Controller ought to offer real time adjustment to fan speeds, required air temperature and a pre programmable increase facility.
Automatic increase on unit with built in humidity sensor.

Read On…

Now read about our heat Pump and remember to check out our Instagram to follow the project, read the rest of the Automated home 2.0 blog messages and find the links to all the products we’ve used in our self-build.

dalyrenewables.com : listen to this Podcast on MVHR Design

Bestseller No. 1

FANTRONIX FTX MVHR D105-A heat recovery Ventilation unit heat Exchanger for low energy consumption decreased Condensation Mould control Improved Air quality

plug and PLAY: Self-contained plug and play MVHR slimline heat recovery ventilation unit with built in frost protection easy to use wall mounted speed controller developed and manufactured by FANTRONIX, available in a complete kit for domestic and commercial installations for 2-10 rooms, or just the unit can be purchased on its own. install with ease with our kit which includes everything required for a full installation, including vents, grilles and ducting
ULTRA COMPACT & easy TO USE: Specially developed for use in small properties like studio apartments, offices, toilets where there is less airflow and space is limited. continuously supplies clean, fresh, filtered air, whilst at the same time extracting pollutants, so your environment is cleaner and totally free of harmful pollens and dust. Eliminates the presence of condensation which fights the presence of harmful damp, rot and moulds in wet areas.
REDUCED noise LEVELS: supply & extract heat recovery airflow rates up to 29 l/s (106 m3/hour). Acoustically insulated, sound absorbing double skinned units decreasing overall sound noise levels down to 24 dBA. safeguard the environment whilst saving money with our professionally evaluated and low energy consuming heat exchanger unit that works quietly using ultra-low voltage.


ទិញនៅលើក្រុមហ៊ុន Amazon

Bestseller No. 2

2 Reviews

heat recovery unit wall Mounted silent Decentralised restroom kitchen Toilet wet room d-MVHR Ventilator smart WiFi control – White


ទិញនៅលើក្រុមហ៊ុន Amazon

Bestseller No. 3

Nuaire MRXBOX95-WH2 2x Replacement MVHR Air Filters pack G3 G4 M5 (MRXBOX-ECO4) (M5 (Pollen + Allergies))


ទិញនៅលើក្រុមហ៊ុន Amazon

Bestseller No. 4

1 ការពិនិត្យឡើងវិញ

Blauberg heat recovery unit wall Mounted silent Decentralised office restroom kitchen Toilet wet room d-MVHR Ventilator smart Wifi control – White (White)

silent continual heat recovery operation with manual or automatic control of humidity, time, airflow and ventilation rate.
Control from your smartphone, home automation system or tablet, Alexa, Echo etc.
Units are connected using WiFi to other units to offer a whole house MVHR solution.


ទិញនៅលើក្រុមហ៊ុន Amazon

Bestseller No. 5

Envirovent energiSava 200 & 250 2x Replacement MVHR G3 G4 M5 Air Filters (G4(បុព្វលាភ))

£ 16,99

ទិញនៅលើក្រុមហ៊ុន Amazon





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