EVIA Brussels, 22 May 2014

1. EVIABrussels, 22 May 2014 New CEN standards for inspection of ventilation and air-conditioning systems Marco Hofman, ISSO (NL) On behalf of CEN/TC156 WG23

2. Role ISSO in CEN Who is Marco Hofman? • Project manager at ISSO,Dutch Building Services Knowledge Centre • Chair of Dutch NEN commission Ventilation and Air tightness of buildings (since 2012) • Member of CEN commission on inspections of ventilation and/or air conditioning systems (working group TC156/23) • Experience with (co)writing and/or editing of Dutch standards (designated by Dutch Building Code), topics: • Energy performance of buildings - Determination method, Dutch standard NEN7120 • Determining minimum airflows for energy performance calculations in buildings, Dutch standard NEN8088

3. Current Inspection standards Under first mandate EPBD: • EN15239 (2007): Ventilation for buildings – Energy Performance of buildings – Guidelines for inspection of ventilation systems • EN15240 (2007): Ventilation for buildings – Energy Performance of buildings – Guidelines for inspection of air-conditioning systems

4. Current EPBD standards In general CA surveys on EPBD show: • No entire adoption by MS • No National Annexes Problems are concerned with: • Complexity • Uniform interpretation • Missing easy to use procedures

5. Requirements EPBD (2010/31) Important changes in relation to inspection:

6. Merging into one new standard Merging of current standards into one standard, but the contents is divided as in other EPBD Standards: • normative texts in the standard (EN) • informative texts in the technical report (TR) EN XXXXX-17: Guidelines for inspection of ventilation and air conditioning systems (total 30 pages) TR XXXXX-18: Guidelines for inspection of ventilation and air conditioning systems -Interpretation of the requirements in EN XXXXX-17 Notes: • Titles of standards can be changed • No Excel-sheet because of no calculations • TR has same structure as EN standard

7. New standard: Scope Standard is applicable to residential and non-residential buildings,equipped with: • air conditioning system without mechanical ventilation; or • air conditioning system(s) with mechanical ventilation; or • natural and mechanical ventilation system(s); and …is applicable to the accessible parts that contribute to the cooling and mechanical ventilation services (fixed systems) Standard is not applicable to: • qualification of the persons or organization in charge of inspections(necessary level of expertise limited due to leaving out measurements on basic inspection level 1); • frequency of mandatory inspection (to be defined on national level); • components supporting the heating function => EN standard heating

8. New standard: Structure General clause that contains aspects of the inspection that concern both ventilation and air-conditioning. Includes: • methods (introduction inspection levels) • general pre-inspection procedure • cleanliness and accessibility aspects Specific clause for inspection of ventilation only systems VO, Method 1 Specific clause for inspection of systems containing AC, Method 2 Note: TR has same structure as EN standard

9. New standard: Insp. procedure

10. Inspection levels Note: The minimum level (level 1) does not require measurements and is sufficient to comply with the requirements of the EPBD recast

11. Pre-inspection Output shall include: • Identification of lacking/outdated information • (checklist available in standard) • Advice to building manager on completing missing issues • Priority areas for the actual inspection: • collecting missing information during inspection on site • where the design installation is important for system functioning in a way likely to affect its performance

12. Actual on-site inspection In general: Output shall include: • Checking correspondence between: • Design documentation and actual installed components • As-installed drawings and actual system Method 1: Output shall include: • Air flow rates (inventory) • Specific fan power (inventory) • Assessment of sizing compared to ventilation requirements Method 2: Output shall include: • Specific cooling load (based on activity/design) • Specific cooling capacity (inventory) • Assessment of AC-efficiency • Assessment of sizing compared to cooling requirements

13. Inspection report Output shall include: • Recommendations for energetic improvements by alternative solutions • Assessment of the system efficiency (incl. maintenance) • Assessment of the sizing compared to cooling and ventilation requirements • Characteristics systems compared to design specifications

14. Assessment sizing AC-system Assessment of AC-sizing is helpful to determine energy- and cost-saving opportunities that may be available. Its purpose is to: • Identify oversizing (on actual operation if possible) • Designate appropriate levels of AC (V) when planning replacements (complete system or components with lower cap.) Steps: 1. Estimating cooling loads (peak load) • If available: design documentation, calculations • If not: estimating e.g. floor area, occupants, heat gains during inspection 2. Estimating cooling capacity • If available: Equipment rating plate • If not: estimating from electrical input power and efficiency • If no information at all: recommendation to review cooling needs prior to specifying a replacement

15. Advice/recommendations Saving energy by alternative measures other than those directly related to the system. Advice in TR about: Reduction of the cooling loads: • Reduction of solar gains • Reduction of internal gains Improvement of system efficiency: • Use of free cooling (ODA) • Distribution efficiency (pumps, insulation) • Emission efficiency (temperatures, unoccupied periods) • Generation efficiency (part load behavior) • Storage

16. Planning - proceedings In the next year(s):

17. Thanks for your attention! m.hofman@isso.nl or @MarcoISSO