A comparison of the two concepts

In carrying out a comparison of a typical 200m2 house the various parameters were inputted into the DEAP calculation method such that both systems should give a house design with an equal BER rating.

 

The parameters were as follows:

 

                                    NuTech Passive Solar House            Passive House Standard

 

DEAP Calculation        46 kWh/m2.Year                               46 kWh/m2.Year

Indicative BER A2        A2                                                         A2

Floor area                     200 m2                                                200m2

Ex Wall (U-Value)        0.16 W/m2.K                                       0.13 W/m2.K

Windows + Doors       1.20 W/m2.K                                       0.80 W/m2.K

Ground Floor                0.12 W/m2.K                                       0.12 W/m2.K

Roof                                0.14 W/m2.K                                       0.14 W/m2.K

Thermal Bridging         Equal                                                    Equal

 

Solar Array                  6m2 Thermomax delivering                   3m2 Thermomax to domestic

                                    energy to domestic hot water                hot water only

                                    and to the integrated HRV and                                                                                      heating system

 

Both houses are designed to have the same BER of 46 kWh/m2.Year and are therefore achieving an A2 rating. However, the NuTech Passive Solar House offers a number of cost and performance benefits:

 

 

Ø      The external wall will be considerably cheaper to build

 

Ø      The windows being double as opposed to triple glazed will be far cheaper

 

Ø      The back-up heating can deliver far more energy by way of the integrated heating system and can therefore cope with a far faster thermal response

 

Ø      More fresh air is delivered when there is more solar radiation available thereby giving increased fresh air at no energy penalty

 

It is suggested also that rather than having very large areas of South facing glazing which may cause problems of over-heating in Summer that a larger area of solar collector can achieve the same result without the over-heating problem.

 

 

 Conclusions

 

The following are our conclusions:

 

Ø      The Passiv Haus Institute design and the NuTech Passive Solar House both offer systems that will perform very well in Ireland.

 

Ø      Both systems will deliver high levels of comfort at exceptionally low running costs

 

Ø      It is proposed that the NuTech Passive Solar House will achieve the same BER rating at a lower capital cost

 

Further Information

For further information please contact NuTech Renewables Ltd