NUTECH CONSULTANTS VENTILATION in HOUSING using SOLAR AIR COLLECTORS

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NUTECH CONSULTANTSVENTILATION in HOUSING
usingSOLAR AIR COLLECTORS

• MARK FORKIN and BILL QUIGLEY

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ARE HOUSES BUILT TOO TIGHT?

• 20 YEARS OF ENERGY EFFICIENCY
• Builders are relying on uncontrolled air leakage

• INDOOR AIR QUALITY IN NEW HOUSES
• Stale odours excess moisture

• HAVE WE GONE TOO FAR?
• No. Not far enough!

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BUILD TIGHT VENTILATE RIGHT

• HOW TIGHT?
• In the US the target is 2 to 3 ACH _at_ 50 Pa
• That is 0.1 to 0.15 ACH

• HOW DO WE COMPARE?
• At best 0.5 to 0.7 ACH
• At worst 1.0 ACH

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BEWARE OF NEGATIVE VENTILATION

• AVOID NATURAL DRAUGHT APPLIANCES
• These units are prone to back-draughts in air
  tight houses.

• OPEN FIRES ARE ALSO A HAZARD
• Smouldering fires produce large amounts of CO

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VENTILATION OPTIONS

• A HOLE IN THE WALL!
• Not tenable.

• PASSIVE VENTILATION
• How to compromise between the calm the storm?

• MECHANICAL VENTILATION
• Positive input or extraction?

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ADD HRV

• POSITIVE INPUT VENTILATION HRV
• DRI-XX by Nuaire Ltd

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ENERGY COST OF VENTILATION
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SIMPLE CURES

• POSITIVE INPUT VENTILATION
• DRIMASTER by Nuaire Ltd

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sunwarm.com
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HOUSE OF TOMORROW

• 26 Sheltered Houses
• - Designed for the active elderly
• - Promoters are Masonic Havens Ltd
• - Supported by DOE and Cavan Co Council and the
  House of Tomorrow Programme
• - 75 available to housing list
• - Warm, dry, healthy, well ventilated homes BUT
  economic to heat

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THE SUNWARM SYSTEM

• Air solar ventilation

• Air to air heat recovery module

• Air solar heating

• Air solar heating of hot water by heat exchanger

• Backup energy by gas, oil, or electric heating
  system

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BASIC CONCEPTS

• If we have high levels of insulation
• gt We must
• Air-tighten buildings - Build Tight - Ventilate
  Right - Use Controlled Ventilation
• Simple Heat Recovery on extract air
• Failure gt 70 of the total heat losses will be
  due to air infiltration and the necessary air for
  ventilation
• Use SunWarm air solar heating, ventilation and
  hot water system to reduce auxiliary heat load

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HIGHLY INSULATED
U-Values (W/m2.K) for the following
elements Element 1997 2002 House of
Regs. Regs. Tomorrow Ground
Floors 0.45 0.25 0.20 Walls 0.45 0.27 0.
22 Roofs 0.25 0.16 0.13 Windows 3.0 2.
20 1.50
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CONSTRUCTION
Insulation Levels Floor Concrete slab 140mm
EPS U0.22 Walls 140mm Timber Frame stud
50mm internally U0.215 Roof 200mm FG
50mm PU internally U0.13 Windows Rational
timber windows soft Low-E U1.8
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SOLAR AIR COLLECTORS
SUNWARM V2 IN VIRGINIA CO CAVAN
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SUNWARM V2
Energy Savings in Virginia
kWhr/sqm.yr

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SOLAR ENERGY FOR THE MASS MARKET
Solar Ventilation
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SOLAR HOT WATER VENTILATION
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COMPARING SOLAR PANELS
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SUNWARM AS VENTILATION SYSTEM
Night time ventilation
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PLUMBING SCHMATIC
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SUMMARY

• You can not have too much fresh air
• So keep pumping it if there is no energy penalty.

Email sunwarm_irl_at_unison.ie