Guideline for planning technical services · Guideline for planning technical services (28.08.2014) No. 1 Maintenance-friendly design Quality criterion Requirement Ensure a maintenance-friendly

28.August 2014

Guideline for planning technical services

2

Guideline for planning technical services

(28.08.2014)

No. 1 Maintenance-friendly design

Quality criterion Requirement

Ensure a maintenance-friendly system over

the entire life cycle

C Good accessibility

Low-maintenance and low-wear products

Ecologically sound wearing parts

Heed the requirements of the manufacturer

Determine responsibilities

Maintenance during the warranty period C Is done by the contractor

Training of the users C Before initial operation

Handover certificate C System documentation

System measurement report

Maintenance report

Assessed overall costs O Life cycle analysis

C ... compulsory criterion, O ... optional criterion

Explanatory text

Good accessibility of all necessary system parts for the maintenance process

Select low-maintenance and low-wear products and also systems: particularly long

maintenance intervals, high service lives/hours of operation

Wearing parts and materials without ecologically unfriendly substances

Guarantee that maintenance is carried out according to the requirements of the manufacturer

in terms of intervals/sequence/scope

During the warranty period the contractor has to be obliged to carry out the maintenance.

After the warranty period it has to be ensured that the maintenance and inspection become the

responsibility of the constructor or the user (training of the users before initial operation).

Before the final conclusion, a handover certificate with system documentation, a system

measurement report and a maintenance report must be handed over.

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Ideally the planning should be done out of investment and running costs, i.e. an “assessed

overall costs” lifecycle analysis needs to be applied.

Further reading / links

“Specification – technical services LG95” (“Leistungsbeschreibung – Haustechnik LG95“)

“Energy performance of buildings – economic evaluation procedure for energy systems in

buildings” (Austrian Standard EN 15459: Energieeffizienz von Gebäuden –

Wirtschaftlichkeitsberechnungen für Energieanlagen in Gebäuden)

“Fundamentals of maintenance” (DIN 31051: Grundlagen der Instandhaltung)

“Program of Services for the Maintenance of Technical Systems and Equipment in Buildings”

(VDMA 24186, parts 0 to 7: Leistungsprogramm für die Wartung von technischen Anlagen und

Ausrüstungen in Gebäuden)

No. 2 Passenger lifts


Efficiency when carrying a load C 60%

Degree of recuperation C 20%

Low standby energy requirement C No permanent force in the door tumbler

Deactivation of the control system when idle

Efficient power supply units

Lift car lighting C Efficient lighting according to VDI 4707

Lift car lighting O Lighting switched off if load not carried or in waiting

position


Explanatory text

Deactivation of the frequency converter controller and other control functions when idle. In off-

peak periods a lower standby state is conceivable, similar to the sleep function with electronic

devices, which could possibly lead to slightly longer waiting times (wake-up time).

Efficient power supply units (switch-mode power supplies, toroidal transformers)

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With the displays (indicators and pushbutton panels on the floors, lift car panel) there are

efficient opportunities with LED technology which must be used extensively with suitable

control (e.g. reduce too high voltage with transducers instead of resistors).


“ÖkoKauf Wien” “Criteria list 06013 lifts” (Kriterienkatalog 06013 Aufzüge)

Brochure “Lifts and escalators” (Aufzüge und Rolltreppen) of the Urban Energy Efficiency

Programme of the City of Vienna

“Guidelines on passenger lifts” (Leitfaden Personenaufzüge, City of Vienna, Municipal

Department 34)

“Lifts – Energy efficiency” (Aufzüge – Energieeffizienz, VDI 4707)

“Electricity consumption and efficiency potential of lifts – final report” (Elektrizitätsverbrauch

und Einspar-Potenziale bei Aufzügen – Schlussbericht, only available in German, Swiss

Agency for Efficient Energy Use S.A.F.E.: 2005 11)

“Specification – technical services LG96” (Leistungsbeschreibung – Haustechnik LG96)

No. 3 Fuel selection / boiler selection


Selection decision C According to “OIB Guideline 6” (“OIB-Richtlinie 6”,

Austrian Institute of Construction Engineering)

Control C Weather-compensated supply temperature control

including variable boiler supply temperature control

Biomass systems C Pollutant emission values and boiler efficiency according

to the “Funding guideline for biomass heating”

(“Förderrichtlinie Biomasseheizung Stadt Wien”) of the

City of Vienna, Municipal Department 25


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Explanatory text

Selection of energy source according to the following priorities:

- District heating

- Renewable energy sources

- Natural gas

- Heat pump

Oil-fired heating systems are to be avoided

Selection generally according to ecological assessment. The following parameters need to be

kept as low as possible:

- Primary energy requirement figure

- GWP (global warming potential)

- Particulate matter

- AP (acidification potential)

District heating

- To be preferred to all other energy sources in areas with district heating available

- High spread of flow/return temperature

- Building connection according to Fernwärme Wien

- High flow temperature covered on demand side

- Type of heat output unrestricted (panel heating, convectors, underfloor convectors,

radiators)

- Is cost-effective with high basic energy demand (e.g. hot water throughout the year)

Renewable energy sources

- When constructing new buildings, renewable energy sources have to be used if this is

technically, ecologically and economically advisable.

Biomass

- Suitable for locations in the suburbs

- Not preferable in the heavily built-up urban area on account of the fine particulate emission

values

- Type of heat output unrestricted (panel heating, convectors, underfloor convectors,

radiators)

- Preferable to cover hot water requirement in summer using thermal solar systems

- Storage room depending on necessary heat requirement and delivery intervals

Thermal solar systems

- See also Planning Guideline No. 5

- For water heating and assisting space heating

- Boiler room requirement depending on necessary heat requirement (size of the buffer tank)

Ambient heat (ground heat exchangers)

- See also Planning Guidelines No. 4 and No. 10

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- Type of heat output geared towards low temperature system (panel heating preferred)


Low temperature gas condensing boiler

- If the fireplace is unsuitable for condensing heating technology, a low temperature gas

boiler can be used

- The return temperature as low as possible for efficient utilisation of the condensing heating

technology

- Type of heat output geared towards low temperature system (panel heating or low

temperature radiator heating)


Heat pump

- See also Planning Guideline No. 4

- Seasonal performance factor at least according to the “Funding guideline for heat pumps”

(Förderrichtlinie Wärmepumpen) of the City of Vienna, Municipal Department 25

- Low flow temperature on demand side to increase the seasonal performance factor

- Type of heat output geared towards low temperature system (panel heating)


Electric heating surfaces

- Interior heating only in exceptional cases (e.g. cost reasons) with less frequent use

- External electric heating systems should be replaced by waste heat utilisation if possible


“ÖkoKauf Wien” “Criteria list 06004 boilers” (Kriterienkatalog 06004 Heizkessel)

“Energy saving and heat insulation” (“OIB Guideline 6”) (Energieeinsparung und Wärmeschutz

(OIB-Richtlinie 6))

“Funding guidelines for biomass heating” (Förderrichtlinien Biomasseheizung, City of Vienna,

Municipal Department 25)

“Funding guideline for heat pumps – funding of heat pumps and heat pumps with solar”

(Förderrichtlinie Wärmepumpen – Förderung WP und WP mit Sola, City of Vienna, Municipal

Department 25)

“Calculation of heat pumps – Simplified method for the calculation of the seasonal performance

factor of heat pumps – Electric heat pumps for space heating and domestic hot water”

(Berechnungen von Wärmepumpen - Kurzverfahren zur Berechnung der Jahresarbeitszahl von

Wärmepumpenanlagen - Elektro-Wärmepumpen zur Raumheizung und

Warmwasserbereitung, only available in German, VDI 4650)

“Energy performance of buildings – Energy use for heating systems” (Austrian Standard H

5056: Gesamtenergieeffizienz von Gebäuden - Heiztechnik-Energiebedarf)

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“Specification – technical services LG35” and “Amendment to the technical services

specification by the City of Vienna as an office standard (additional items) as part of the

programme “ÖkoKauf Wien” LG43” (Leistungsbeschreibung – Haustechnik LG35 and

Ergänzung der Leistungsbeschreibung HT durch die Stadt Wien als Bürostandard

(Zusatzpositionen) im Rahmen des Programms “ÖkoKauf Wien” LG43)

No. 4 Heat pumps


Seasonal performance factor C According to the “Funding guideline for heat pumps”

(“Förderrichtlinie Wärmepumpen”, only available in

German) of the City of Vienna, Municipal Department 25

Water heating C Possibility of supplementary heating (hygiene problem)

Area of use O Space heating and water heating

Heating and cooling

Low temperature heat output system O Preferable

Thermal solar system O Support for water heating

Simulation O Computer simulation advantageous for precise design


Explanatory text

Selection of heat pump according to the following priorities:

- Water/water heat pump

- Brine/water heat pump using vertical collector (deep drilling)

- Brine/water heat pump using horizontal collector

- Air/water or air/air heat pump (with nearly zero-energy houses which can be heated with air

= passive house)

If possible, heat pumps should be used for space heating and water heating.

If possible and if necessary, heat pumps should be used for heating and cooling.

Since the coefficient of performance (COP) increases when the temperature difference

becomes lower, it is preferable to select a low temperature heat output system.

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Heat pumps’ seasonal performance factor > 4 only possible with water/water or brine/water

heat pumps in combination with a low temperature system. (Please note: To perform better in

comparison with fossil fuels in terms of primary energy, a seasonal performance factor of at

least 3 must be achieved.)

Support for the heat pump for water heating using a thermal solar system needs to be checked.

On account of the hygiene problem, the possibility of supplementary heating for heating water

needs to be checked.


“Funding guideline for heat pumps” (Förderrichtlinie Wärmepumpen, City of Vienna, Municipal

Department 25)

“Thermal use of groundwater and underground – Heating and cooling” (Guideline 207 of the

Austrian Water and Waste Management Association ÖWAV) (Thermische Nutzung des

Grundwassers und des Untergrunds – Heizen und Kühlen (ÖWAV-Regelblatt 207)

“Calculation of heat pumps – Simplified method for the calculation of the seasonal performance

factor of heat pumps” (Berechnungen von Wärmepumpen – Kurzverfahren zur Berechnung der

Jahresarbeitszahl von Wärmepumpenanlagen, only available in German, VDI 4650)

“Energy performance of buildings – Energy use for heating systems” (Austrian Standard H

5056: Gesamtenergieeffizienz von Gebäuden - Heiztechnik-Energiebedarf)

Commission Decision of 9 November 2007 establishing the ecological criteria for the award of

the Community eco-label to electrically driven, gas driven or gas absorption heat pumps

(Official Journal of the European Union 2007/742/EC)

“Amendment to the technical services specification by the City of Vienna as an office standard

(additional items) as part of the programme "ÖkoKauf Wien" LG43” (Ergänzung der

Leistungsbeschreibung HT durch die Stadt Wien als Bürostandard (Zusatzpositionen) im

Rahmen des Programms "ÖkoKauf Wien" LG43)

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No. 5 Thermal solar systems


Selection criterion C High collector capacity

Solar buffer tank C Minimise losses

Water heating C Via buffer tank with fresh water module

Area of use O Water heating and assisting space heating

Heating and cooling

Simulation O Computer simulation of the precise design, proof of the

degree of utilisation of the system can be provided via

simulation


Explanatory text

A fundamental selection criterion has to be as high as possible temporal correspondence

between demand and solar supply (high collector capacity).

If possible, thermal solar systems should be used for water heating and for assisting space

heating.

If possible and if necessary, thermal solar systems should be used for heating and cooling

(solar cooling).

Hydraulic connection has to be chosen according to energy efficiency (high degree of utilisation

of the system) – i.e. layered buffer tank.

Solar buffer tank (incl. heat insulation) needs to be the right size – i.e. neither too big nor too

small.

Select supplementary heating/additional system according to ecological assessment – see

Planning Guideline No. 3.

On account of the hygiene problem, as low as possible storage of hot drinking water has to be

the target – i.e. buffer tanks with fresh water modules are preferred.


“Thermal solar systems and components – Solar collectors – Part 1: General requirements”

(Austrian Standard EN 12975-1: Thermische Solaranlagen und ihre Bauteile – Kollektoren –

Teil 1: Allgemeine Anforderungen)

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No. 6 Hot water underfloor heating


Tightness C Impervious to oxygen diffusion

Adjustment log C Heat quantities have to be demonstrably ensured for

individual rooms/zones

Maximum surface temperatures C Must be observed without exception

Air separation heat exchangers C Have to be provided

Temperature falling below dew-point level C Must be prevented in any case


Explanatory text

Maximum surface temperature for comfortable indoor climate

- in the living area 29°C

- in the wet area 35°C

- in the perimeter area 35°C

Attention needs to be paid to system inertia with load changes.

In extreme situations with regard to residual heating load or large window areas, measures

have to be taken to ensure that the temperature does not fall below dew-point level.

Air separation heat exchangers must be provided to prevent pollution.

Screed structure and minimum height have to be taken into account from the start.


“ÖkoKauf Wien” “Criteria list 06009 hot water underfloor heating” (Kriterienkatalog 06009

Warmwasser-Fußbodenheizung)

“Space plan and amendments for district offices of the City of Vienna” (Raumbuch und

Ergänzungen für Amtshäuser der Stadt Wien, City of Vienna, Municipal Department 34)

Austrian Standard EN 1264, Parts 1 to 4


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No. 7 Radiators


Adjustment log C Heat quantities have to be demonstrably ensured for


Equipment C Thermostatic valves

Thermostatic heads (theft-proof in publicly accessible

areas)

Fittings in the radiator C For radiator adjustment

For radiator disassembly

Fittings in the heating section C Draining

Bleeding

Shutting off

Mounting position O Technically correct position

Design O Low temperature radiator

Panel radiator

Hygienic design


Explanatory text

Low temperature panel radiators with one or two panels without convector panels and without a

cover must be used.

With the zoning for the control, attention needs to be paid to the orientation and the load

situation.

For the planning, the technically correct mounting position must be ensured. The convection

and radiant power must not be hindered.

Radiators have to be equipped with thermostatic valves including fixed or adjustable Kvs1

inserts and thermostatic heads. It has to be possible to preset the thermostatic heads and they

have to be theft-proof in publicly accessible areas.

Fittings have to be provided for disassembly and adjustment of radiators

Fittings have to be provided for draining, bleeding and shutting off the individual heating

sections

1 Kvs value: water flow rate through a valve with nominal stroke (open 100%)

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“ÖkoKauf Wien” “Criteria list 06005 radiators” (Kriterienkatalog 06005 Heizkörper)


No. 8 Heating and chilled water pumps


Energy efficiency class C According to Regulation (EC) No. 641/2009

Pump selection C Piping network pressure loss calculation

Heat insulation C With hot and cold media


Explanatory text

A piping network pressure loss calculation has to be the basis for the pump selection.

Selection of the pump type according to specific requirement of the overall system (load profile,

uniformity of the load profile, etc.) => Control/regulation (speed regulation etc.).

Heat insulation of the pumps has to be ensured both with hot and also with cold media.


“ÖkoKauf Wien” “Criteria list 06008 INLINE heating and chilled water pumps” (Kriterienkatalog

06008 Heizungs- und Kaltwasserpumpen in INLINE-Ausführung)

“Technology guidelines for circulating pumps of the Urban Energy Efficiency Programme of the

City of Vienna” (Technologieleitfaden Umwälzpumpen des Städtischen Energieeffizienz-

Programms der Stadt Wien)

Commission Regulation (EC) No 641/2009 of 22 July 2009 implementing Directive 2005/32/EC

of the European Parliament and of the Council with regard to ecodesign requirements for

glandless standalone circulators and glandless circulators integrated in products

“Specification – technical services LG35 and LG 62” (Leistungsbeschreibung – Haustechnik

LG35 und LG 62)

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No. 9 Insulation of pipes


Insulation quality C According to the Austrian Standards B 2260 and H 5155

and according to requirements for Fernwärme Wien if

appropriate

Protection C Against mechanical influences

Against the effects of weather

Pipe installations C To be insulated in accordance with “OIB Guideline 6”

(“OIB-Richtlinie 6”, item 6.1, only available in German)


Explanatory text

Insulation thicknesses for district heating systems according to requirements for Fernwärme

Wien.

Protection against mechanical influences and the effects of weather must, if necessary, be

ensured.

Ensuring the insulation quality remains intact with aging.

Selection of insulating material generally according to ecological assessment. (e.g. harmless

production and disposal, substances, emission of hazardous substances, etc.).

Pipe installations (fittings, pumps) have to be insulated according to OIB Guideline 6 (item 6.1):

Easy disassembly of the insulation is necessary for inspection purposes.

It must be ensured that the insulation can be reused after the inspection.




“Technical guidelines for building systems” (Technische Richtlinien Hausanlagen, Fernwärme

Wien)

“Energy saving and heat insulation” (OIB Guideline 6 )(Energieeinsparung und Wärmeschutz

(OIB-Richtlinie 6))

Austrian Standard B 2260 “Thermal, cryoprotection, sound and fire insulation works for

industrial installation and building equipment – Works contract“ (Wärme-, Kälte-, Schall- und

Branddämmarbeiten an betriebs- und haustechnischen Anlagen - Werksvertragsnorm)

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Austrian Standard H 5155 “Thermal insulation of pipelines and components in building service

installations” (Wärmedämmung von Rohrleitungen und Komponenten in haustechnischen

Anlagen)

“Specification – technical services LG79 and LG LG82” (Leistungsbeschreibung – Haustechnik

LG79 und LG82)

No. 10 Ventilation systems with heat recovery


Heat recovery C 80%

Humidity recovery C 50% with regenerative heat recovery

Adjustment log C Air quantities have to be demonstrably ensured for


Checklist C “Quality criteria checklist for classroom/living room or

office building ventilation systems” (“Qualitätskriterien-

Checkliste für Klassenzimmer-/Wohnraum- oder

Bürogebäudelüftungen”, only available in German) of the

Federal Ministry for Transport, Innovation and Technology

(bmvit) must be taken into consideration in the planning

and the qualities must be determined in consultation with

the constructor.

Fresh air quantities C According to the Austrian Standard EN 13779 for non-

residential buildings

Ventilator selection C Energy efficiency according to the OIB Guideline 6

Overall system C Low pressure loss with distribution system

Tightness class C

Bear condensate problem in mind

Regulation


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Explanatory text

On the theme of ventilation and ventilation systems there is already detailed relevant literature

which must be taken into account when planning (see also “Further reading”).

Ventilation efficiency of various systems: displacement ventilation is preferable to mixing

ventilation.

Fresh air quantities according to Austrian Standard EN 13779 – the air quality level must be

defined by the constructor.

If allowed for hygiene reasons, regenerative heat recovery (e.g. rotary heat exchangers) must

be preferred to other, non-regenerative heat recovery methods.

With the ventilator selection, attention has to be paid to energy efficiency (according to OIB

Guideline 6, section 6.3: SFP of class 1 according to the Austrian Standard EN 13779).

Requirements for the overall system

The air pipes have to be designed to ensure as low as possible pressure loss in the air

distribution system.

The tightness class must be at least C (according to the Austrian Standard EN 15727).

With the fresh air supply, the condensate problem and also the insulation of the air pipes must

be taken into account.

The regulation of the quantity of fresh air based on the ambient air quality has to be checked

(ambient air quality, CO2 and temperature sensors).

Ensuring it is easy to clean the entire ventilation system has to be already taken into

consideration in the planning process.

Outdoor air preheating/cooling

System selection (ground/brine or ground/air heat exchanger)

Effective length of the heat exchanger

Flow speed

Maintenance requirements and the structural arrangements for these


“Technology guidelines for energy efficiency with ventilation systems of the Urban Energy

Efficiency Programme of the City of Vienna” (Technologieleitfaden Energieeffizienz bei

Lüftungsanlagen des Städtischen Energieeffizienz-Programms der Stadt Wien)

“Energy saving and heat insulation” (OIB Guideline 6) (Energieeinsparung und Wärmeschutz

(OIB-Richtlinie 6))



“Planning guidelines for classroom ventilation (bmvit – House of the Future)”

(Planungsleitfaden Klassenzimmerlüftung (bmvit – Haus der Zukunft))

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“Quality criteria for classroom ventilation systems (bmvit – House of the Future)”

(Qualitätskriterien für Klassenzimmerlüftungen (bmvit – Haus der Zukunft))

“Quality criteria for comfort ventilation systems (bmvit – House of the Future)”

(Qualitätskriterien für Komfortlüftungen (bmvit – Haus der Zukunft))

“Ventilation for non-residential buildings – Performance requirements for ventilation and room-

conditioning systems” (Austrian Standard EN 13779: Lüftung von Nichtwohngebäuden -

Allgemeine Grundlagen und Anforderungen für Lüftungs- und Klimaanlagen und

Raumkühlsysteme)

“Ventilation for buildings – Ducts and ductwork components, leakage classification and testing”

(Austrian Standard EN 15727: Lüftung von Gebäuden - Luftleitungen und Luftleitungsbauteile,

Klassifizierung entsprechend der Luftdichtheit und Prüfung)

“Ventilation and air conditioning plants – Specifications keeping them clean and cleaning”

(Austrian Standard H 6021: Lüftungstechnische Anlagen - Reinhaltung und Reinigung)

REHVA Guidebook No 1: “Displacement ventilation in non-industrial premises”, No 2:

“Ventilation Effectiveness”, No 4: “Ventilation and Smoking, Reducing the exposure to ETS in

buildings”

No. 11 Passive cooling measures, direct cooling, free cooling


Night ventilation C Must be arranged

Reduction of cooling load O Internal loads

External loads



Explanatory text

Reduction of the cooling load by reducing internal loads

Use of energy-efficient equipment & processes (energy optimisation during operation)

Reduction of heat input into the room (switch off equipment if not being used)

Efficient light planning (daylight, artificial light)

Reduction of the cooling load by reducing external loads

Proportion of transparent/opaque component surfaces

Shading (difference between internal/external shading)

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Glazing quality

Albedo (degree of reflection for sunrays) and heat insulation of the opaque components

Night ventilation

For the night cooling to work properly, it must be ensured that there is a corresponding air

change and as full as possible flow (transverse ventilation).

It may be beneficial to utilise the thermal system on several floors – atriums or stairways.

With night cooling, the cooling down period should last at least 5 hours.

With night ventilation, burglary and weather protection must be ensured.

Direct cooling via geothermal probes or wells is worthwhile only with a room-side system with a

sufficiently high flow temperature (surface cooling).

Free cooling must be checked with recooling systems (attention must be paid to the cold flow

temperature on the demand side).


“Passive cooling with night ventilation”( BINE Information Service Themeninfo I/03) (Passive

Kühlung mit Nachtlüftung (BINE Informationsdienst Themeninfo I/03))

For air-ground heat exchangers see Planning Guideline No. 10

For component activation see Planning Guideline No. 12


(additional items) (Ergänzung der Leistungsbeschreibung HT durch die Stadt Wien als

Bürostandard (Zusatzpositionen)) as part of the programme “ÖkoKauf Wien” LG44

No. 12 Component activation

1. Quality criterion 2. 3. Requirement

4. Adjustment log 5. O 6. Heat quantities have to be demonstrably ensured for


7. Maximum surface temperatures 8. M 9. Must be observed without exception

10. Air separation heat exchangers 11. M 12. Have to be provided

13. Temperature falling below dew-point

level

14. M 15. Must be prevented in any case

16. Heating and cooling mode at the same

time

17. M 18. Must be prevented in any case

19. Reduction of cooling load 20. O 21. Internal loads

22. External loads

23. C ... compulsory criterion, O ... optional criterion

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Explanatory text

Maximum surface temperature with heating mode for comfortable indoor climate

of the floor 29°C

of the ceiling 28°C

Minimum surface temperature with cooling mode for comfortable indoor climate

Depends on the particular case2

The temperature must not fall below dew-point level in any case

Selection of flow temperature in cooling mode

High flow temperature to increase the seasonal performance factor

Take alternative refrigeration/direct cooling into consideration – see Planning Guideline No. 11

Passive measures to reduce the cooling demand (e.g. energy-efficient equipment and lighting)

must be taken into consideration.

The controllability is limited because of the register zones (i.e. no single-room control).

Attention needs to be paid to system inertia with load changes.

Air separation heat exchangers must be provided to prevent pollution.

Simultaneous heating and cooling mode must be prevented by active locking.


For passive cooling measures see Planning Guideline No. 11


(additional items)” (Ergänzung der Leistungsbeschreibung HT durch die Stadt Wien als

Bürostandard (Zusatzpositionen)) as part of the programme “ÖkoKauf Wien” LG67

2 With parquet floor often 19°C, with cooling ceilings 15°C

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No. 13 Solar cooling – absorption and adsorption cooling systems, DEC

systems3


COP of absorption cooling system C At least 0.7 single

At least 1.2 double

Recooling C Via closed cooling tower

Thermal solar system C Combination with water heating and space heating

DEC systems C Only when allowed for hygiene reasons

Cold output system O Geared towards high temperature system


Explanatory text

Combination of the thermal solar system with hot water and heating integration for better

utilisation of the collectors is recommended

Heat sources: thermal solar systems, district heating and if necessary waste heat occurring

elsewhere

Absorption cooling systems

- The higher the source temperature level and the required cooling flow temperature, the

higher the coefficient of performance

- Type of cold output geared towards high temperature system (surface cooling)

- For hygiene reasons, recooling must be done via closed cooling towers with

- spraying

Adsorption cooling systems

- Powered by low-temperature heat in the range of 50°C-90°C

- Can be combined well with solar systems

- Environmentally friendly working material: water-silica gel

- Simple mechanical construction

DEC systems (desiccant and evaporative cooling)

- Area of application with existing/planned air conditioning system

- Ideal if a lot of fresh air is needed, especially if there is also the need for

humidification/dehumidification as well as cooling

- Only when allowed for hygiene reasons

3 Absorption: The refrigerant is dissolved in a second material in a solvent circuit at low temperature. Adsorption: The refrigerant is accumulated on the surface of a solid solvent DEC: Desiccant and evaporative cooling (cooling by drying and evaporating)

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- “Technology guidelines for solar cooling for office and service buildings of the Urban

Energy Efficiency Programme of the City of Vienna (Technologieleitfaden Solares Kühlen

für Büro- und Dienstleistungsgebäude des Städtischen Energieeffizienz-Programms der

Stadt Wien)

- For thermal solar systems see Planning Guideline No. 5

- “Amendment to the technical services specification by the City of Vienna as an office

standard (additional items)” (Ergänzung der Leistungsbeschreibung HT durch die Stadt

Wien als Bürostandard (Zusatzpositionen)) as part of the programme “ÖkoKauf Wien”

LG67

No. 14 Boilers for drinking water


Tank losses C Insulation class 6

Water heating C Via buffer tank with fresh water module

Buffer tank size C Must be designed according to the specific project

Supplementary heating register C Must be attached on the service water side

Thermal solar system O Process water-side stratified charge

Service water-side fresh water module


Explanatory text

On account of the hygiene problem, as low as possible storage of hot drinking water has to be

the target – i.e. buffer tanks with fresh water modules are preferred.

The size of the buffer tank has to be based on a project-specific design/dimensions.

Design of the supplementary heating register (if necessary) has to be geared towards heat

source (boiler) (heating-up time, tank volume).

Electric supplementary heating registers have to be attached on the service water side (not in

the buffer tank or stratified tank).

Thermal solar systems

- With heating integration, a buffer tank with stratified charge on the process water side and a

fresh water continuous flow system on the service water side need to be provided

- With several large heating water buffer tanks, these have to be connected in series/parallel.

The continuous flow systems must be designed for two-wire operation.

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For thermal solar systems see Planning Guideline No. 5

“ÖkoKauf Wien” “Criteria list 06006 boilers and storage tanks for hot drinking water”

(Kriterienkatalog 06006 Boiler und Speicher für Trinkwarmwasser)

“Hygienic aspects of the planning, construction, operation, surveillance and rehabilitation of

central heating installations for drinking water” (Austrian Standard B 5019: Hygienerelevante

Planung, Ausführung, Betrieb, Wartung, Überwachung und Sanierung von zentralen

Trinkwasser-Erwärmungsanlagen)


No. 15 Daylight-controlled artificial lighting systems


Daylight utilisation C Use daylight as far as possible

Simulation O Daylight simulation beneficial for analysing variants


Explanatory text

Areas of application:

- Office or school use

- New building or general renovation

Basic principles of daylight utilisation

- Windows without lintels if possible

- Use of daylight control elements

Control

- Fully-automatic

- Semi-automatic: Switching off (dimming) via daylight intensity, manual activation possible



22

No. 16 Photovoltaic systems


Module efficiency C At least 14%

Degradation (aging) C Max. 20% in 20 years



Explanatory text

A fundamental selection criterion is as long as possible unshaded positioning of the

photovoltaic modules.

With façade and component integration, the following parameters must be taken into

consideration:

- Orientation (cardinal direction)

Usually orientation towards the south will be ideal. East-west orientation is favourable if a

broader day profile needs to be created by this.

- Shading

By trees or adjacent objects.

- Cooling of the photovoltaic modules

Rear ventilation of the modules increases the module efficiency.

- Use of the photovoltaic modules as sun protection

to reduce the cooling load.

For off-grid systems there is no investment aid in the Vienna urban area. In individual cases a

photovoltaic system can still be advantageous compared to other power sources, however.

In individual cases a lower module efficiency can be accepted if the module has an additional

function (e.g. shading with remaining daylight utilisation, weather protection with building

integration, etc.)



23

No. 17 Cooling of server systems


Operating temperature C Maximum according to City of Vienna, Municipal

Department 14-ADV

Redundant cooling O To be arranged depending on safety class

Geothermal heat release O Must be checked


Explanatory text

The maximum operating temperature must be planned depending on the specific project and in

each case according to the requirements of the City of Vienna, Municipal Department 14-ADV.

Air conditioning methods

- Free cooling via outside air only with small systems

- External climate cabinet

- Energy-efficient, water-cooled cabinets (with high power density, energy transport with

water going as close as possible to the heat source is a good idea).

Depending on the safety class, redundant cooling needs to be arranged for failure protection.

The possibility of geothermal heat release (probes, groundwater) must be checked.


“ÖkoKauf Wien” “Criteria list 06011 split and multi-split air conditioning systems with a

maximum cooling capacity of 20 kW” (Kriterienkatalog 06011 Split- und Multisplitklimaanlagen

mit einer maximalen Kälteleistung von 20 kW)

“Planning aid for reliable data centres of the Federal Association for Information Technology,

Telecommunications and New Media” (Planungshilfe betriebssicheres Rechenzentrum

(BITKOM))

Documents

Guideline for planning technical services · Guideline for planning technical services (28.08.2014) No. 1 Maintenance-friendly design Quality criterion Requirement Ensure a maintenance-friendly