Passive ventilation with heat recovery and Oxypod (CP763)

LEAD AGENCY: Royal Borough of Greenwich
OTHER PARTNERS: Ventive, Oxypod
PROJECT SUMMARY: This project combines airtightness measures with innovative passive ventilation with heat recovery, and a new heating system de‐aerator (Oxypod), applied to 50+ dwellings of mostly older  housing stock – pre‐1919, both hard‐to‐treat and with severe fuel poverty, EPC‐rated E or below.

Airtightness is often disregarded when applying standard insulation measures, resulting in significant reductions in actual delivered energy savings – without addressing uncontrolled infiltration, no level of insulation will prevent heat loss or reduce fuel poverty. At the same time, airtight properties – without adequate ventilation – dramatically reduce indoor air quality, leading to condensation, damp and mould, negatively impacting the inhabitants (increased risk of asthma and respiratory diseases) and the building.  Ventilation without heat recovery leads to loss of energy savings, and mechanical ventilation with heat recovery has proven ineffective in retrofit and adds energy costs (often leading to tenants turning it off).  Ventive PVHR uses no electricity to run, recovers the heat energy from outgoing air, and can be integrated into existing chimneys (convenient and reduces draughts).  Oxypod de‐aerates heating system water to provide heating efficiency savings, increasing temperature and saving tenants money.

EVALUATION METHODOLOGY: Conduct interviews with a sample of households to capture behaviours and previous energy expenditure.

Supplement household interviews with thermal data logging conducted with recognised calibrated standalone devices, and manual energy meter readings will be requested from householders (during the winter heating period). Radiator thermal imaging will be carried out before and after installation of Oxypod to assess changes. ‘Ventive’ will also assess and compare airtightness, air quality and internal and external temperatures of properties before and after installation of the various measures.

PROJECT OUTCOMES:
  • The programme will generate fresh evidence as to the role of ‘Passive Ventilation Heat Recovery’ in improving confirm for fuel poor households across a range of property and tenancy types.
  • The impact of these combined products should allow tenants to heat homes to a healthy and comfortable level.
REGION IN WHICH PROJECT WILL BE DELIVERED:  London
LOCAL AUTHORITY AREA/KEY LOCATIONS IN WHICH PROJECT WILL BE DELIVERED:  Royal Borough of Greenwich
DETAILS OF TECHNOLOGIES TRIALLED:
  • Airtightness measures e.g. draught stripping
  • Passive ventilation with heat recovery (PVHR): Ventive S (chimney integrated) OR Ventive S+ (ducted)
  • Oxypod
ELIGIBLE HOUSEHOLDS ASSISTED
NEA GRANT WITH MATCH FUNDING MATCH TOTAL
50 50
Project report can be downloaded here
Published on 12-10-2016
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