Evia brussels 22 may 2014
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EVIA Brussels, 22 May 2014. New CEN standards for inspection of ventilation and air-conditioning systems Marco Hofman, ISSO (NL) O n behalf of CEN/TC156 WG23. Role ISSO in CEN. Who is Marco Hofman? Project manager at ISSO, Dutch Building S ervices K nowledge Centre

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EVIA Brussels, 22 May 2014

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Evia brussels 22 may 2014

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


Role isso in cen

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


Current i nspection standards

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


Current epbd standards

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


Requirements epbd 2010 31

Requirements EPBD (2010/31)

Important changes in relation to inspection:


Merging into one new standard

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


New standard scope

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


New standard structure

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


New standard insp p rocedure

New standard: Insp. procedure


Inspection levels

Inspection levels

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


Pre inspection

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


Actual on site inspection

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


Inspection report

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


Assessment sizing ac system

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


Advice recommendations

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


Planning proceedings

Planning - proceedings

In the next year(s):


Thanks for your attention

Thanks for your attention!

[email protected]

or

@MarcoISSO


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