Passive houses

The high efficiency heat exchanger in the ComfortDisc (TM) HRV combined with the energy efficient EBM Papst EC fan motor, a Carel PLC with custom software leads the way in maximizing energy savings while delivering exceptional control and comfort.

Air delivery is by insulated metal ducts with three meter lengths of acoustic flexible ducting to attenuate air noise.  The 125mm diameter outlets deliver quiet airflow and mix the air evenly from floor to ceiling using the Venturi principle.

Power consumption requirements and delivery system efficiency are paramount with passive houses.  ComfortDisc (TM) is not your standard heat recovery system.  It can heat or cool as well as provide heat recovery.

The ComfortDisc (TM) uses innovative control software combined with pressure and temperature sensors to provide maximum energy efficiency.  It provides flexibility to transfer air from warmer areas to colder areas and zoning if required.

Zoning is not normally used or requested in a passive house, but is many building it is a major advantage and energy saving benefit to have.  Zoning allows better control of occupant comfort and reduces temperature differentials between north facing rooms and south facing rooms, especially where large areas of glass are used.

While large areas of glazing are a benefit when the sun is out, they can be a disadvantage on hot days and cause rooms to overheat.  At nighttime, large areas of glazing can be a disadvantage with heat loss far greater (up to seven times) than that of a wall.

While traditional passive house specifications allow for a large temperature swing from 18C to 26C in interior temperature, with ComfortDisc the target interior temperature is 20C to 21C year round.

This is achieved by zoning the building, giving the occupants control of the temperature in for example, bedroom areas, kitchen & living room and dining room.  Combined with programmable thermostats allowing for four different temperatures during four different periods, exceptional comfort and energy efficiency is achieved.

While 18C is a comfortable temperature for sleeping, it is not a comfortable temperature for a living area.  In a standard passive house, the entire building is in theory one temperature.  So it can be a comfortable 18C when you are sleeping or an uncomfortable 18C in your living room. ComfortDisc eliminates these disadvantages in passive buildings.

By using solar thermal storage for heating (hot water made by solar panels and stored for later use) when required your passive building can be comfortable when you want.  In hot weather, cold well or ground water can be circulated through the ComfortDisc coil to provide cooling.

In keeping with the passive house ethos of minimal energy use, ComfortDisc delivers exceptional comfort with exceptional efficiency.