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Treatment of Mechanical Extract Ventilation and Balanced Whole House Mechanical Ventilation in DEAP. Date October-2007. Definition of Ventilation Systems Ref: DEAP Manual Section 2.6. Mechanical extract ventilation (MEV):

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treatment of mechanical extract ventilation and balanced whole house mechanical ventilation in deap

Treatment of Mechanical Extract Ventilation and Balanced Whole House Mechanical Ventilation in DEAP

Date October-2007

definition of ventilation systems ref deap manual section 2 6
Definition of Ventilation Systems Ref: DEAP Manual Section 2.6

Mechanical extract ventilation (MEV):

is a fan driven ventilation system, which only extracts air from the dwelling. The DEAP calculation is based on a throughput of 0.5 air changes per hour through the mechanical system, plus infiltration.

Balanced whole house mechanical ventilationno heat recovery (MVNHR):

is a fan driven ventilation system, which provides fresh air tothe rooms in the dwelling and also extracts exhaust air from the dwelling. The system is not fitted with a heat recovery unit. The DEAP calculation in such cases is based on a throughput of 0.5 air changes per hour through the mechanical system, plus infiltration.

Balanced whole house mechanical ventilationwith heat recovery (MVHR):

is a fan driven ventilation system, which provides fresh air tothe rooms in the dwelling and also extracts exhaust air from the dwelling. The system is fitted with a heat recovery unit. The DEAP calculation in such cases is based on a throughput of 0.5 air changes per hour through the mechanical system, plus infiltration.

The heat loss by mechanical ventilation is reduced by the factor v where v = 0.66 is the default efficiency assumed for the heat recovery system.

deap default data specific fan power
DEAP Default Data: Specific Fan Power
  • The fans in mechanical ventilation system consume electricity.
  • The electricity consumption is reflected by the specific fan power (SFP) of the unit.
  • Default SFPs are detailed in DEAP Table 4g:
deap default data heat exchanger efficiency
DEAP Default Data: Heat Exchanger Efficiency
  • MVHR systems recover heat from the exhaust air and use this to warm inlet air.
  • The efficiency of the heat recovery system is reflected in the rated heat exchanger efficiency of the unit.
  • The default heat exchanger efficiency used in DEAP is 66%
  • The DEAP software uses the default data unless otherwise specified
treatment of mechanical ventilation heat recovery systems in deap default values

Treatment of Mechanical Ventilation Heat Recovery Systems in DEAP (default values)

Select appropriate ventilation system and default values are automatically used

treatment of mechanical ventilation heat recovery systems in deap default values6

Treatment of Mechanical Ventilation Heat Recovery Systems in DEAP (default values)

Click here and you will see the default values

testing ventilation systems
Testing Ventilation Systems
  • Test methods
  • Developed by EST (Energy Saving Trust), BRE (Building Research Establishment), TEHVA (The Electric Heating and Ventilation Association), RVA (Residential Ventilation Association)
  • Based on the European standards
  • Must be read alongside the European standards:
  • BS EN 13141-6:2004 to define the duct configurations
  • BS EN 13141-7:2004 covering testing of heat recovery ventilation
  • MVHR Test temperatures
operation of mev systems
Operation of MEV Systems

Outlet terminal

Fan unit

Toilet

exhaust

Kitchen

exhaust

Bathroom

exhaust

1.SFP (W/litre/sec) - power input to the fan at the minimum flow rate at each

operating point when the system is installed in accordance with the manufacturers instructions.

slide9
Operation of MVHR Systems

Duct from fan to

Supply terminal

Duct from fan to

Outlet terminal

T1

T4

Heat recovery

and fan unit

T3

T2

Bedroom 1

supply

Bedroom 2

supply

Lounge

supply

Kitchen/dinner

supply

Kitchen

exhaust

Bathroom

exhaust

Toilet

exhaust

1. SFP (W/litre/sec) - power input to the fans at the minimum flow rate at each operating point when the system is installed in accordance with the manufacturers instructions.

2. Thermal performance (efficiency) of assembled supply and exhaust package with heat recovery used for a single dwelling (T2 - T1) / (T3 – T1)

slide10
Operation of MVNHR Systems

Duct from fan to

Outlet terminal

Duct from fan to

Supply terminal

Fan unit

Bedroom 1

supply

Bedroom 2

supply

Lounge

supply

Kitchen/dinner

supply

Kitchen

exhaust

Bathroom

exhaust

Toilet

exhaust

1. SFP (W/litre/sec) - power input to the fans at the minimum flow rate at each operating point when the system is installed in accordance with the manufacturers instructions.

procedure for handling ventilation systems with more efficient parameter data
Procedure for Handling Ventilation Systems with more Efficient Parameter Data
  • Search the SAP Appendix Q Product Database (www.sap-appendixq.org.uk )
  • Use the product specification to identify the appropriate specific fan power or the SFP and Heat exchanger efficiency for the configuration that best matches that of the particular dwelling – including the nature of the ductwork, viz. rigid or flexible.
  • Enter the specific fan or the specific fan power and heat exchanger efficiency values directly in to DEAP software, Ventilation tab.
slide17
Select the Specific Fan Power and Heat Exchanger Efficiency (if MVHR) for the configuration that best fits the assessment dwelling

Example

Example

other considerations
Other Considerations
  • Dwellings with MEV/MVHR systems will yield better BERs when combined with improved air tightness measures.
  • If a product is not listed on SAP Appendix Q, product manufacturers should refer to the “Testing Standards” page on SAP Appendix Q website for details of how to get a product listed.
deap queries
DEAP Queries
  • Refer to guidance in DEAP manual
  • Check FAQ section of www.sei.ie/ber
  • Email [email protected]
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