Andrew J Ball

On Construction Domestic Energy Assessor (OCDEA) for new-build home energy SAP ratings, providing On Construction Energy Performance Certificates (OCEPCs)
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Achieving CSH Level 3- Exemplar 2a - 2 Storey Mid Terrace House - MECHANICAL VENTILATION WITH HEAT RECOVERY APPROACH
 
BUILT FORM
Mid terrace 2 storey house
Ground floor area 43.94m2, first floor area 43.94m2
Sheltered sides = 2
 
THERMAL ENVELOPE
'U' values for external elements
  • Ground floor 'U'=0.12 W/m2K
  • Walls 'U'=0.15 W/m2K
  • Insulated flat ceiling to pitched roof 'U'=0.09 W/m2K
  • Windows 'U'=1.3 W/m2K
  • Doors 'U'= 0.9 W/m2K

 

VENTILATION

Design air permeability = 3.0 m3/hour/m2 at 50 Pa

Mechanical ventilation system with heat recovery (system SAP Appendix Q registered)

  • Kitchen + 2 additional wet rooms
  • Rigid, insulated ductwork
  • Specific fan power = 1.0 w/l/s
  • Heat exchange efficiency = 85%

 

HEATING AND HOT WATER

Gas fired condensing combi boiler - 90.3% efficient, SEDBUK band A

  • Controls - time and temperature zone control (full zone control)
  • Emitters - wet system radiators
  • Boiler interlock present
  • No compensator present

No secondary heating to lounge

 

LIGHTING

10 no. fixed dedicated low energy light fittings

 

CONSTRUCTION DETAILS

Accredited construction details used

 

SPECIAL FEATURES

Flue gas heat recovery system applied to boiler.