¶ Input data and evidence for decentralised systems
This section outlines the methodology for the inclusion of decentralised non-ducted whole-house heat recovery ventilation systems and mechanical extract ventilation systems. This methodology is based on the Ecodesign and Energy Labelling Regulations for Residential Ventilation Units. Simple weighting calculations are used to account for multiple units in a single dwelling.
The methodology outlined here is based on use of test data from the ErP label and Ecodesign Product Information which are required to be made publicly available for residential ventilation units (RVUs) being sold on the EU market after 1st January 2016.
The key references for regulations as applied to the directives are as follows. These detail the data that must be displayed on manufacturer literature, website declarations etc. for compliant devices.
Table 3.10 - EU Regulations on mechanical ventilation systems
| Regulation | Title |
|---|---|
| 1253/2014 | Implementing Directive 2009/125/EC of the European Parliament and of the Council with regard to Ecodesign requirements for ventilation units |
| 1254/2014 | Supplementing Directive 2010/30/EU of the European Parliament and of the Council with regard to energy labelling of residential ventilation units |
| 2016/C 416/06 | Commission communication in the framework of the implementation of Commission Regulation (EU) No 1253/2014 implementing Directive 2009/125/EC of the European Parliament and of the Council with regard to Ecodesign requirements for ventilation units and of the implementation of Commission Delegated Regulation (EU) No 1254/2014 supplementing Directive 2010/30/EU of the European Parliament and of the Council with regard to energy labelling of residential ventilation units. |
The performance of the ventilation system under the directives is based on EN 13141 and EN 13142 standards as follows, with full detail of relevant standards in the document “2016/C 416/06” referenced above:
- SPI – Specific Power Input – (more detail below on conversion to Specific Fan Power for DEAP)
- EN 13142: 2013 (scoping standard) and the test method for measured values is described in the 13141-series regarding type of unit. The units must be tested in compliance with the regulations, i.e. pressure and flow rate measurements.
- EN 13141-8:2014 Ventilation for buildings — Performance testing of components/products for residential ventilation - Part 8: Performance testing of un-ducted mechanical supply and exhaust ventilation units (including heat recovery) for mechanical ventilation systems intended for a single room.
- Thermal Efficiency – The test methods are as per EN 13141-8, referenced above.
The following data is needed for the calculation of non-default SFP and heat recovery efficiency in DEAP:
Table 3.11 - Data required for decentralised mechanical ventilation systems
| Data | Source | Note |
|---|---|---|
| Make and model of ventilation unit |
|
Documentary evidence to be uploaded to DEAP (e.g., photos, plans). |
|
SPI in W/(m3 /h) or, SFP in W/(l/s) |
|
The EPREL database lists the required data in the category “Residential Ventilation Units”. Evidence to be uploaded to DEAP (e.g., PDF). |
| Thermal Efficiency of Heat Recovery System in % |
|
The EPREL database lists the required data in the category “Residential Ventilation Units”. Evidence to be uploaded to DEAP (e.g., PDF). |
| Run time in hours per day | Designer specification | Evidence to be uploaded to DEAP (e.g., PDF) |
| Design flow rate | Designer specification | Evidence to be uploaded to DEAP (e.g., PDF) |
The DEAP entries for decentralised non-ducted whole-house heat recovery ventilation systems and mechanical extract ventilation systems are:
- The type of mechanical ventilation system
- The whole-house average SFP[W/(l/s)]
- The whole-house average heat exchanger efficiency , where applicable
If single units include heat recovery or a mix of heat recovery and mechanical extract, "balanced whole-house mechanical ventilation with heat recovery” should be selected;
- If single units only include mechanical extract with no heat recovery, “whole-house extract ventilation” should be selected.
The steps to derive the non-default data inputs are:
- Convert the SPI [W/(m3/h)] to SFP [W/(l/s)] for each of the decentralised units installed in the dwelling:
SFP = SPI * 3.6- A flow rate of 1m3/h equates to a flow rate of 1000 litres every hour, or 1/3.6 l/s
- Calculate an average SFP [W/(l/s)] for the dwelling based on the SFP for individual units installed in the dwelling, weighted by flow rate, and run time:
𝐴𝑣𝑒𝑟𝑎𝑔𝑒 𝑆𝐹𝑃 [𝑊/(𝑙/𝑠)]= ∑𝑖 𝑆𝐹𝑃𝑖 𝐻𝐷 𝑖𝐹𝑅𝑖
∑𝑖 𝐻𝐷 𝑖𝐹𝑅𝑖
Where:
- SFP (l/s) is the SFP for the individual unit.
- FR (l/s) is the flow rate of each unit as provided by the system designer.
- HD is the run time in hours per day as provided by the system designer.
The sums must include all units present in the dwelling; When a whole-house decentralised system includes both MVHR and MEV units, the calculation of the system SFP includes both.
3. For systems incorporating all or some units with heat recovery, calculate the average Heat Exchanger Efficiency for the dwelling based on the efficiency for individual units installed in the dwelling, weighted by flow rate and the run time:
Where:
- η is the heat exchanger efficiency for the individual unit.
- FR (l/s) is the flow rate of each unit as provided by the system designer.
- HD is the run time in hours per day as provided by the system designer.
The sums must include all units present in the dwelling; When a whole-house decentralised system includes both MVHR and MEV units, the calculation of the heat exchanger efficiency should include both; For MEV, the value of η would be zero as MEV units do not recover heat.
Reminders:
Please ensure that units are used consistently, e.g. all flow rates are in [l/s]. Where appropriate product data is not available, defaults as listed in the DEAP manual for heat recovery efficiency and SFP apply.