DEAP Heat Pump Webinar 2 - Delivered Feb 23rd 2021.

1. www.seai.ie

2. DEAP Heat Pump Webinar 2
February 23rd, 2020
David Bevan & Marco Smith

3. 1. Acceptable evidence for non-default efficiency data
Supporting documentation required
2. Heat Pump Installation Considerations
• Importance of Building Fabric Performance and Controlled Ventilation
• Heat Output Relative to Design Temperatures
• Typical Air Source Heat Pump System Layout
• Heat Emitters
• Domestic Hot Water Tanks
• Buffer Tanks
• Domestic Hot Water Priority
• Mixed Heating Circuits
• The Defrost Cycle
3. Heat Pump Controls
• Control types
• Entry into DEAP
Overview
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4. 1 – Supporting Evidence
Acceptable evidence to support the use of non-default efficiency data
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5. Supporting Evidence – based on Directives & Regulations
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• The Ecodesign & Energy Labelling Directives give rise to Regulations relating to heat pumps:
– 811/2013: Energy labelling of space heaters, combination heaters…
– 812/2013: Energy labelling of water heaters, hot water storage tanks…
– 813/2013: Ecodesign requirements for space heaters and combination heaters
– 814/2013: Ecodesign requirements for water heaters and hot water storage tanks
– 206/2012: Ecodesign requirements for air conditioners and comfort fans
– 626/2011: Energy labelling of air conditioners
• Manufacturers must supply documentation to support the technical data relating to their products:
– Label
– Technical documentation

6. Supporting Evidence – based on Directives & Regulations
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• To be acceptable for use in DEAP, the documentation must do the following:
– It must clearly identify the heat pump model(s),
– It must state the relevant Regulation,
• e.g. 811/2013
– It must state all of the relevant data,
• e.g. for Space Heating, the 55°C Temperature Application data for Average Climate
Conditions must be provided.

7. Supporting Evidence – Based on Directives/Regulations – Why?
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Why do SEAI look for supporting evidence in this format?
• In the first place, manufacturers are required to produce the documentation for any product that
they place on the market, so the BER Assessor is looking for information which should already be
in place;
• When a manufacturer’s declaration states compliance with the relevant EU Regulation, it is then
subject to verification under EU law.

8. For this heat pump the
document provided has,
• The ecodesign label;
and,
• The efficiency data
Example 1 - Acceptable ecodesign/energy labelling documents
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9. For this heat pump the
document provided has,
• The ecodesign label;
and,
• The efficiency data
Example 1 - Acceptable ecodesign/energy labelling documents
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10. For this heat pump the
document provided has,
• A reference to the relevant
Regulations;
and,
• The efficiency data.
Example 2 - Acceptable ecodesign/energy labelling documents
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11. For this heat pump the
document provided has,
• A reference to the relevant
Regulations;
and,
• The efficiency data.
Example 2 - Acceptable ecodesign/energy labelling documents
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12. For this heat pump the
document provided – a brochure
from the manufacturer - has
some technical data but not
enough to fill out the heat pump
section of DEAP.
This document is not acceptable
for use in DEAP.
Example 3 - Not acceptable – data missing
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13. Some documents have all the
necessary data but do not have
a reference to the relevant
Regulation(s).
As such they are not subject to
verification under EU law and as
a result, they are not acceptable
for use in DEAP.
If an ecodesign label was
provided for this model, then the
data could be used in DEAP.
Example 4 - Not acceptable – missing reference to Directives
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14. Supporting Evidence – Based on test data
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Test reports must,
• Clearly identify the heat pump model(s);
• State the test standard;
– EN14825 for space heating;
– EN16147 for water heating.
• Come from a test laboratory that is accredited to perform tests to the relevant test standard; that can
be verified by,
– The Accreditation body for the country in question, e.g. DAkkS (Germany);
– NANDO.
• Provide the relevant test data;
• Be written in English (see further details on translations in the DEAP manual, p10).

15. Acceptable test report
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16. Requirements for test data
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• Some data may not be listed on the ecodesign data sheet
– This is because there are differences between data measured in EN16147 and data required on the
ecodesign documentation
• This data – which is required by the heat pump calculation in DEAP – can be supplied in additional
documentation by the manufacturer/supplier.
• The additional documentation must state on headed company paper,
– the heat pump model(s)
– the relevant Regulation – e.g. 811/2013, 812/2013, 813/2013, or 814/2013.
• These values are typically for EN16147 test data for the following areas:
– Reference hot water temperature
– Capacity of Heat Pump
– Volume of DHW accounted for in test
– Standby Heat Loss

17. Section 2:
General Installation Considerations
Marco Smith

18. • Super insulation and perfect airtightness
not necessary.
• A reasonable level of insulation and
elimination of draughts is essential.
• Emitters can be a limiting factor in retrofits.
• Heat Pumps are not suited to intermittent
heating.
• Controlled ventilation is desirable.
Importance of Building Fabric Performance and Controlled Ventilation
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19. • The heat output and
efficiency of an Air
Source Heat Pump is
variable.
• Performance at design
conditions must be
determined.
• Can have a significant
effect on running costs.
Heat Output Relative to Design Temperatures
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20. Typical Air Source Heat Pump System Layout
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• Similar to
conventional heating
systems
• Sizing of equipment
and emitters is very
important
• Running costs linked
to design

21. Heat Emitters
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Underfloor Heating Wall Heating
Convector Radiators Aluminium Radiators Fan Convectors

22. Domestic Hot Water Tanks for Heat Pumps
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Heat Pump
DHW Tank

23. Buffer Tanks
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Buffer Tank

24. Domestic Hot Water Priority
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DHWHP

25. • In retrofit installations existing
mixed heating circuits are checked.
• Heat Pump may need to deliver a
higher temperature than would
otherwise be needed.
• May be necessary in some
circumstances such as in a system
with a mix of underfloor heating
and radiators.
Mixed Heating Circuits
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26. The Defrost Cycle
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Start of Defrost Cycle Midway Point Defrost Cycle Complete

27. The Defrost Cycle
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• Not all Air Source Heat Pumps defrost in
the same way
• Some units enter the defrost cycle at
regular intervals based on outdoor
temperature (around 5°C)
• Some units feature "demand based
defrost controls" to only enter defrost
mode when required in order to save
energy

28. 3 - Controls
Weather Compensation; DEAP entry
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29. Example of control complexity
A heat pump system with radiators – quick response but doesn’t store heat well.
• The room thermostat monitors temperature and when the target temperature is reached signals
to the heat pump to shut off;
• The system has little capacity to store heat so the temperature in the dwelling can drop relatively
quickly;
• This leads to frequent on/off cycling of the heat pump which reduces system efficiency and
compressor lifetime.
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30. Example of control complexity
A system with underfloor heating in a concrete slab:
• The room thermostat monitors temperature and when the target temperature is reached, it
signals to the heat pump to shut off.
• The system has the capacity to store enough heat that the heat pump does not need to come on
for several hours.
• However, by this time the external temperature has cooled so the load has increased.
• As a result the house feels cool and it takes a few hours to get back to the target temperature.
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31. A weather compensator is a thermostat located on an outside wall of the dwelling to monitor the
external air temperature
When the external temperature increases, the weather compensator signals to the heat pump to
reduce the flow temperature of the water leaving the heat pump.
Weather Compensator
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32. This increases efficiency, because it reduces the temperature difference between source and sink.
It is also good for the compressor because it lengthens the compressor run-time and reduces the
frequency of on/off cycling.
Weather Compensator
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33. But this is not usually a simple case of everything working straight out of the box.
Careful design is required to identify the best control settings for the system.
Weather Compensator
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34. • Every model of heat pump has its own control system.
• Above are some examples of the user interface which display varying amounts of information on
the operation of the system and can be used to control the heat pump to a varying degree,
depending on the particular model.
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Heat Pump Control Panels

35. Controls for heat pump systems
There are a variety of ways to set up the system depending on,
• Heat emitter type(s)
– Underfloor
– Radiators
– A mix of underfloor and radiators
• Additional measures to increase the capacity to store heat
– Buffer tank
– Underfloor pipework in concrete slab
• Zoning of the system
– Single zone
– Multi-zone
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36. Controls for heat pump systems (continued)
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• And there are a variety of controls that could be installed
– Room thermostat(s)
– TRVs
– Weather compensator
– Multi-channel Programmer / timers
• As an Assessor you must match the controls to the options available in DEAP:

37. Time & Temperature Zone Control
• Multiple space heating zones with each space heating zone having,
– Independent time control
and,
– Independent temperature control
• Number of zones required defined in the DEAP Manual:
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38. Time & Temperature Zone Control - Example
So in a dwelling of 190m2 with two space heating zones, to achieve T&T Zone Control,
• Each space heating zone requires a time control,
– A timer for each space heating zone,
or,
– A programmer with a channel for each space heating zone.
And,
• Each space heating zone requires a temperature control, i.e.
– A room thermostat for each space heating zone.
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39. Time & Temperature Zone Control - Evidence
• Controls should be noted in the Survey Form
• Clear photographs of the controls:
- Time controls
- Temperature controls
• Specifications of controls for New Dwelling-Provisional BERs
– Not enough to say “Time and Temperature Control” will be used.
– Need to specify how it will be achieved.
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40. Future Heat Pump Webinars
• DEAP HP Webinar 3
– Designer/Installer Sign-off Sheet
– Use of a Non-default Flow Temperature
• DEAP HP Webinar 4
– DEAP Heat Pump Methodology 2020
– Other HP Types
– Heat Pump Tool 2020
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Questions?

42. End of presentation