Non-Default Flow Temperatures in DEAP
This will be the 3rd in a series of documentary evidence webinars for registered BER assessors. This webinar for registered BER assessors and will cover the following:
1. The effect of Flow Temperature on heat pump operation
2. The Designer/Installer sign-off workbook
3. BER Requirements where a non-default flow temperature is used.
The objective of the webinar was to provide BER assessors an understanding of the National Retrofit programme, what is a one stop shop, key requirements and conditions, a home energy assessment and what Grants are available.
Lighting and Lighting Controls
The objective of the webinar to assist you in modelling lighting, lighting controls and display lighting in BERs in new and existing buildings. Recognising lighting types will also be discussed.
The details of the 3 different lighting entry methods will be compared. NCM default lux levels and lighting efficacy will be discussed. The different aspects of lighting controls will be presented in some detail. More specialist subjects such as top-lit and side-lit spaces, impact of window size, etc, will be outlined.
Display lighting will be reviewed.
The impact of lighting on heating energy will be demonstrated.
SEAI - Non Domestic Webinar #1 Domestic Hot Water Systems in NEAPSustainableEnergyAut
The objective of this webinar was to provide the assessor with the knowledge on how to identify a hot water system and input into iSBEMie correctly.
Other items covered included, how to establish the required efficiency data, the assigned storage aspects, individual or bi-valent systems and how to apply it to zones.
Recoup WWHRS: Products overview: New-build and retrofit optionsRecoup WWHRS
Recoup produce a range of SAP-listed, highly efficient Waste Water Heat Recovery systems for Showers (WWHRS) which extract waste heat energy from used shower water in order to pre-heat the incoming cold feed. This simple solution offers one of the best ‘pound for points’ ratios of any SAP measure and is a true ‘fit and forget’ product, and ultimately can save up to 67% of the energy cost each time a shower is used (regardless of heat source).
For new-build residential, WWHRS can simply be used with a 'Fabric-first' approach, often in place of other more expensive SAP measures such as Solar thermal, ASHP, PV or triple glazing, but for a fraction of the cost. It is an ideal option for residential modular build designs as well as student accommodation builds; hotels or leisure facilities.
Furthermore, it requires no complex installation or commissioning; no ongoing or planned maintenance; no end-user interaction; and has no moving or mechanical parts - Just on-demand, passive energy savings with every shower.
Experts explain new multifamily auditing techniques, their scalability, what makes the energy savings cost-effective, where the programs can be most successful, and what non-energy benefits result from this work.
Non-Default Flow Temperatures in DEAP
This will be the 3rd in a series of documentary evidence webinars for registered BER assessors. This webinar for registered BER assessors and will cover the following:
1. The effect of Flow Temperature on heat pump operation
2. The Designer/Installer sign-off workbook
3. BER Requirements where a non-default flow temperature is used.
The objective of the webinar was to provide BER assessors an understanding of the National Retrofit programme, what is a one stop shop, key requirements and conditions, a home energy assessment and what Grants are available.
Lighting and Lighting Controls
The objective of the webinar to assist you in modelling lighting, lighting controls and display lighting in BERs in new and existing buildings. Recognising lighting types will also be discussed.
The details of the 3 different lighting entry methods will be compared. NCM default lux levels and lighting efficacy will be discussed. The different aspects of lighting controls will be presented in some detail. More specialist subjects such as top-lit and side-lit spaces, impact of window size, etc, will be outlined.
Display lighting will be reviewed.
The impact of lighting on heating energy will be demonstrated.
SEAI - Non Domestic Webinar #1 Domestic Hot Water Systems in NEAPSustainableEnergyAut
The objective of this webinar was to provide the assessor with the knowledge on how to identify a hot water system and input into iSBEMie correctly.
Other items covered included, how to establish the required efficiency data, the assigned storage aspects, individual or bi-valent systems and how to apply it to zones.
Recoup WWHRS: Products overview: New-build and retrofit optionsRecoup WWHRS
Recoup produce a range of SAP-listed, highly efficient Waste Water Heat Recovery systems for Showers (WWHRS) which extract waste heat energy from used shower water in order to pre-heat the incoming cold feed. This simple solution offers one of the best ‘pound for points’ ratios of any SAP measure and is a true ‘fit and forget’ product, and ultimately can save up to 67% of the energy cost each time a shower is used (regardless of heat source).
For new-build residential, WWHRS can simply be used with a 'Fabric-first' approach, often in place of other more expensive SAP measures such as Solar thermal, ASHP, PV or triple glazing, but for a fraction of the cost. It is an ideal option for residential modular build designs as well as student accommodation builds; hotels or leisure facilities.
Furthermore, it requires no complex installation or commissioning; no ongoing or planned maintenance; no end-user interaction; and has no moving or mechanical parts - Just on-demand, passive energy savings with every shower.
Experts explain new multifamily auditing techniques, their scalability, what makes the energy savings cost-effective, where the programs can be most successful, and what non-energy benefits result from this work.
Warner Homes is running an online event to provide a refresher to contractor QA on where Major Renovation applies and how it is measured in the context of TGD Part L.
We will address key insights around quality, and will examine in detail what is the source of high numbers of fails in a selected measure. In this session, we are reviewing common fails for external wall insulation.
This presentation explores the challenges and opportunities in achieving energy savings in multifamily buildings from an “on the ground” perspective. Utilizing case studies and examples from recent CEE research and energy efficiency programs, this presentation provides an overview of technologies and strategies that have proven to be effective and marketable energy efficiency measures in MN multifamily buildings, including; ventilation system retrofits, optimizing boiler control systems, optimizing condensing boilers, retrofitting trash chutes, and adding demand-based controls to domestic hot water recirculation pumps.
Green buildings : Challange in Operation and MaintenanceTejwant Navalkar
The paper looks at the existing maintenance practices with some telling pictures and goes on to suggest changes in the approach to maintenance in line with the Green Building requirements.
A brief insight of what goes to make a building green is given to put the challenges in Operation and Maintenance in proper perspective.
Property Developers, after a slow start, acknowledged the concept of development lifetime costing and swiftly realized the need to review their project, its components to accommodate sustainability as a driver of the engineering systems. The presentation sheds light on most Engineering systems explored including Energy and water Efficiencies through both Passive Design and Active Designs, District Cooling , Alternative Energy like Cogeneration, Solar Harvesting and Geothermal Energy with some highlights on Transportation, Parking, Foundations and Geotechnical Investigation
This is a brief company profile of Design2Occupancy Services LLP. Here we are showcasing out team, field of expertise and our clients through the 4 year journey.
Highlights of the Kuwait HVAC&R Conference 2017Swati Warang
A brief-overview of the highlights of the 2nd kuwait HVAC&R Conference, a confluence of ideas to improve HVAC system efficiency and implement best practices in construction.
Warner Homes is running an online event to provide a refresher to contractor QA on where Major Renovation applies and how it is measured in the context of TGD Part L.
We will address key insights around quality, and will examine in detail what is the source of high numbers of fails in a selected measure. In this session, we are reviewing common fails for external wall insulation.
This presentation explores the challenges and opportunities in achieving energy savings in multifamily buildings from an “on the ground” perspective. Utilizing case studies and examples from recent CEE research and energy efficiency programs, this presentation provides an overview of technologies and strategies that have proven to be effective and marketable energy efficiency measures in MN multifamily buildings, including; ventilation system retrofits, optimizing boiler control systems, optimizing condensing boilers, retrofitting trash chutes, and adding demand-based controls to domestic hot water recirculation pumps.
Green buildings : Challange in Operation and MaintenanceTejwant Navalkar
The paper looks at the existing maintenance practices with some telling pictures and goes on to suggest changes in the approach to maintenance in line with the Green Building requirements.
A brief insight of what goes to make a building green is given to put the challenges in Operation and Maintenance in proper perspective.
Property Developers, after a slow start, acknowledged the concept of development lifetime costing and swiftly realized the need to review their project, its components to accommodate sustainability as a driver of the engineering systems. The presentation sheds light on most Engineering systems explored including Energy and water Efficiencies through both Passive Design and Active Designs, District Cooling , Alternative Energy like Cogeneration, Solar Harvesting and Geothermal Energy with some highlights on Transportation, Parking, Foundations and Geotechnical Investigation
This is a brief company profile of Design2Occupancy Services LLP. Here we are showcasing out team, field of expertise and our clients through the 4 year journey.
Highlights of the Kuwait HVAC&R Conference 2017Swati Warang
A brief-overview of the highlights of the 2nd kuwait HVAC&R Conference, a confluence of ideas to improve HVAC system efficiency and implement best practices in construction.
Nereus for cooling - Sustainable Water Solutions, LLCdamiendasher
Sustainable Water Solutions, LLC is is a multi-discipline group of highly experienced and innovative water industry professionals who focus on providing the most complete, efficient and effective water reuse, water recycling, and process fluid treatment solutions available today.
Presentation at the 2011 USGBC Illinois Chapter Credential Maintenance Day by Rob Young and Scott Bowman. Using the LEED Platinum Wellmark BCBS Headquarters in Des Moines, Iowa as a case study, the presenters provide factors related to rainwater capture systems, how LEED credits relate, demonstrate the system from design through start-up, and discusses pros and cons of rainwater capture and flushing systems.
Homeowners with natural gas water heaters have difficulty justifying the expense of a more efficient condensing heater. Combination space and domestic hot water systems bundle together the two loads, which saves energy and makes them more cost-effective. These systems also help eliminate combustion safety concerns.
Historically, mechanical contractors have custom engineered and pieced together combi systems in the field, paying little attention to efficiency and optimization. But condensing heating plants will only reach their energy saving potential when all components are designed and installed correctly.
In the realm of home comfort and efficiency, modern water heater
installation options have evolved to meet the diverse needs of
homeowners. As technological advancements continue to shape the
landscape of residential and commercial appliances, the choices
available for water heating systems have expanded beyond traditional
models. In this comprehensive guide, we will explore the latest
innovations and modern water heater installation options,
shedding light on the benefits and considerations associated with each.
Looking to save money on your hot water bills? Consider the free heat pump hot water rebate! Get cash back for installing an energy-efficient heat pump hot water system and enjoy long-term savings on your utility bills. Act now and take advantage of this valuable rebate offer. To get further details visit our website. www.timetosave.com.au
Building Energy 2014: PV and Heat Pumps by Fortunat Muellerfortunatmueller
Presentation on the possibilities for Net Zero building using a combination of Grid Tied PV and Ductless Mini Split heat pumps. from Building Energy 2014 Tuesday seminar
With moratorium for natural gas in place for a good portion of Cape Cod, Cape Light Compact has been working with several agencies to come up eith efficient heating options.
Our business team at SEAI will take you through education supports, energy audit voucher,s and grant supports for businesses who want to save energy and reduce their bills. You will also learn about how you can fund your renewable energy transition.
The SEAI Fellowship pilot programme will provide the opportunity for postdoctoral or experienced researchers to apply for research fellowship positions based within SEAI.
This webinar will help you understand:
How to reduce your energy use and bills this winter.
SEAI supports and grants to help you further reduce costs and move away from fossil fuels.
How to fund your renewable energy transition.
The objective of this training will be to introduce contractors to the fundamentals of Quality Management Systems and to help them to understand how they can assist contractors in providing quality service to our Homeowners.
Session 2 - National Energy Research and Policy Conference 2022SustainableEnergyAut
Presentations from:
Dr Bernadette Power
Dr Gary Goggins
Jean-Pierre Roux
Dr Noreen Brennan
Dr Niall Dunphy
Katie Harrington
Dr Róisín Moriarty
Dr Brian Caulfield
This is a stakeholder engagement webinar in relation to identifying a suitable energy education service provider(s), to provide Management and Administrative Services to support the delivery of the SEAI School Workshop Programme.
The webinar will outline how SEAI can help and support committed public bodies now and in the long term to achieve 2030 targets. SEAI are delighted to have Jan Rosenow, Director of European Programmes at the Regulatory Assistance Project, addressing the current drivers for climate action and why it is an imperative strategic concern for all businesses, public and private. Peter Smyth, Assistant National director in the HSE Capital and Estates Department will cover their journey from ad hoc once-off projects dependent on annual budgets, to a strategic HSE Infrastructure Decarbonisation Roadmap.
Cosmetic shop management system project report.pdfKamal Acharya
Buying new cosmetic products is difficult. It can even be scary for those who have sensitive skin and are prone to skin trouble. The information needed to alleviate this problem is on the back of each product, but it's thought to interpret those ingredient lists unless you have a background in chemistry.
Instead of buying and hoping for the best, we can use data science to help us predict which products may be good fits for us. It includes various function programs to do the above mentioned tasks.
Data file handling has been effectively used in the program.
The automated cosmetic shop management system should deal with the automation of general workflow and administration process of the shop. The main processes of the system focus on customer's request where the system is able to search the most appropriate products and deliver it to the customers. It should help the employees to quickly identify the list of cosmetic product that have reached the minimum quantity and also keep a track of expired date for each cosmetic product. It should help the employees to find the rack number in which the product is placed.It is also Faster and more efficient way.
Student information management system project report ii.pdfKamal Acharya
Our project explains about the student management. This project mainly explains the various actions related to student details. This project shows some ease in adding, editing and deleting the student details. It also provides a less time consuming process for viewing, adding, editing and deleting the marks of the students.
Saudi Arabia stands as a titan in the global energy landscape, renowned for its abundant oil and gas resources. It's the largest exporter of petroleum and holds some of the world's most significant reserves. Let's delve into the top 10 oil and gas projects shaping Saudi Arabia's energy future in 2024.
Hierarchical Digital Twin of a Naval Power SystemKerry Sado
A hierarchical digital twin of a Naval DC power system has been developed and experimentally verified. Similar to other state-of-the-art digital twins, this technology creates a digital replica of the physical system executed in real-time or faster, which can modify hardware controls. However, its advantage stems from distributing computational efforts by utilizing a hierarchical structure composed of lower-level digital twin blocks and a higher-level system digital twin. Each digital twin block is associated with a physical subsystem of the hardware and communicates with a singular system digital twin, which creates a system-level response. By extracting information from each level of the hierarchy, power system controls of the hardware were reconfigured autonomously. This hierarchical digital twin development offers several advantages over other digital twins, particularly in the field of naval power systems. The hierarchical structure allows for greater computational efficiency and scalability while the ability to autonomously reconfigure hardware controls offers increased flexibility and responsiveness. The hierarchical decomposition and models utilized were well aligned with the physical twin, as indicated by the maximum deviations between the developed digital twin hierarchy and the hardware.
Welcome to WIPAC Monthly the magazine brought to you by the LinkedIn Group Water Industry Process Automation & Control.
In this month's edition, along with this month's industry news to celebrate the 13 years since the group was created we have articles including
A case study of the used of Advanced Process Control at the Wastewater Treatment works at Lleida in Spain
A look back on an article on smart wastewater networks in order to see how the industry has measured up in the interim around the adoption of Digital Transformation in the Water Industry.
1. Update from:
Fiona Smith (Marketing and Communications Manager SEAI)
6th February 2019
1
Upcoming changes to DEAP methodology
2. Changes to DEAP Water Heating
www.seai.ie2
Future Developments
Changes to DEAP Ventilation
Renewable Energy Ratio (Part L new dwelling compliance)
Changes to DEAP Lighting Demand
3. 3 www.seai.ie
Changes to DEAP Methodology – Provisional Timelines
Date Update to include:
April 2019 Part L (Dwellings) 2019 published Nzeb standard for dwellings
DEAP workbook version 4.2.0 Updates to DEAP methodology, TGD L 2019
compliance check, integrated heat pump calculator
DEAP manual version 4.2.0 Methodology changes & TGD L 2019 compliance
Survey Guide version 3.0 Survey & publication guidance on methodology
changes
Survey Form New lighting, MVHR, water heating inputs included
July 2019 DEAP 4.2.0 software UI updates, methodology updates, TGD L 2019
compliance checks & integrated heat pump
calculation tool
DEAP manual version 4.2.1 Incorporating changes to DEAP 4 software,
methodology updates
5. 5 www.seai.ie
Water Heating – Changes to energy demand calculation
• In NZEB – hot water energy demand can be significantly
larger than the space heating energy demand.
• Demand has been based on number of occupants (floor
area) - too simple compared to space heating calculation.
New methodology will take account of
• Updated occupancy rates
• Shower types and presence of baths
• Electricity used by electric showers
• Low water use fittings
NZEB Apartment
(Regulatory Impact Assessment)
Primary Space Heating Primary Water Heating
Primary Lighting Primary Pumps/ Fans
6. Occupancy rates
DEAP 3.2.1 NZEB
100m2 200m2 250m2
3.13
6.66
6 www.seai.ie
Water Heating – Updated occupancy rates
• In DEAP, hot water usage dependent on no. of occupants
• No. of occupants will be updated to more accurately reflect
occupancy rates (based on BRE research)
50m2 150m2 300m2
7. 7 www.seai.ie
Water Heating – Updated hot water requirement
• A daily hot water requirement in litres/day is calculated separately for three categories of use:
• Hot water required for showers (Vd,shower)
• Hot water required for baths (Vd,bath)
• Hot water required for other uses (Vd,other)
• Combination provides a total daily hot water demand for each month
Vd,average (litres/day) = Vd,shower + Vd,bath + Vd,other
8. 8 www.seai.ie
Water heating – Hot water required for showers
• Daily hot water requirement is calculated individually for each shower in the dwelling & then summed
• For each shower, hot water requirement depends on
• No. of occupants (floor area) & adjusted to account for a bath if present
• Shower flow rate - (Hot water pressure) depends on plumbing arrangement, pumps, flow
restrictors
9. 9 www.seai.ie
Water heating – Entering showers in DEAP
1. Enter type of shower – choice of 4
Depends on no. of occupants (floor area) & if bath present
10. 10 www.seai.ie
Water Heating – Identifying type of shower
Choose Basic
Shower Type
Mixer
Shower
Hot Water
Cylinder
Fed by
Header Tank
Pump for
shower
Pump for all
DHW
Combi
Not fed by
Header Tank
No
Pump
Instant
Electric
Unvented
DHW System
Vented
DHW System
Vented DHW
System +
Pump
11. 11 www.seai.ie
Water Heating – Identifying type of shower
Choose Basic
Shower Type
Mixer
Shower
Hot Water
Cylinder
Fed by
Header Tank
Pump for
shower
Pump for all
DHW
Vented DHW
System +
Pump
Pump? Notes
Yes Includes in-built shower pumps and whole dwelling pump used
to increase water pressure generally
Identification of pump = often beside HW cylinder or could be
built into shower unit (look-up make & model of shower)
Default (higher flow rate)
No Evidence = note on survey form
12. 12 www.seai.ie
Water heating – Entering showers in DEAP
2. Is flow rate known? – yes or no
Flow rate known? Notes
Yes Enter flow rate in DEAP
Evidence = technical data sheet for shower
No A default flow rate is applied based on shower type
13. 13 www.seai.ie
Water Heating – Entering showers in DEAP
2. Is flow rate known? If not, default flow rates are applied
Shower Type Default Flow Rate (l/min)
Vented Hot Water System 7
Vented Hot Water System + Pump 12
Unvented Hot Water System 11
Instantaneous Electric Shower 01
Notes
1. Instantaneous electric showers have only a cold water feed, so use no hot water
15. 15 www.seai.ie
Water Heating – Entering showers in DEAP
3. Is there a flow restrictor present?
Flow Restrictor? Notes
Yes Permanent flow restrictor installed (requiring use of tools to remove)
Where flow rate is known - enter flow rate with restrictor (min flow
rate in DEAP = 6 l/min)
Where flow rate is unknown – default flow rate reduced to 6 l/min
for all shower types
Evidence = technical data sheet for shower or photo if visible
No Default
16. 16 www.seai.ie
Water Heating – Entering showers in DEAP
Instantaneous Electric Shower
• Don’t use any hot water - they only have a cold water feed
• The significant amount of electricity they use is accounted for in DEAP
• Also affects the heat gain calculation in DEAP
17. 17 www.seai.ie
Water Heating – Bath in dwelling
• The amount of hot water used in baths depends on
• no. of occupants (floor area) & adjusted to account for a shower if present
Vd,bath = DHW used per bath * the number of baths per day
18. 18 www.seai.ie
Water Heating – Volume of hot water required for other uses
• The remaining hot water use is calculated as a simple function of the number of occupants, N.
Vd,other (litres/day) = 9.8 N + 14
Vd,average (litres/day) = Vd,shower + Vd,bath + Vd,other
Hot water energy requirement at taps (kWh/y)
19. 19 www.seai.ie
Water Heating – instantaneous waste water heat recovery
• Use a heat exchanger to recover heat from waste warm
water to pre-heat the cold water feed of a shower
• The energy recovered depends on
• the number and type of systems that are installed.
20. 20 www.seai.ie
Water Heating – instantaneous waste water heat recovery
• 2 product specific parameters taken from the Product Characteristics Database (PCDB):
• The unit’s heat recovery efficiency
• A utilisation factor taking account of unrecoverable heat at the beginning and end of shower
events.
21. 21 www.seai.ie
Water Heating – instantaneous waste water heat recovery
• Input efficiency (%) & utilisation factor from Product Characteristics Database
22. 22 www.seai.ie
Water Heating – instantaneous waste water heat recovery
WWHRS installed? Notes
Yes Evidence = technical data sheet, design/ as-built
specification and drawings
Efficiency & UF from PCDB
No Default
23. 23 www.seai.ie
Water Heating – reduced water consumption (target ≤ 125 l/p/d
• Where the design of the system reduces overall water consumption within the dwelling, the
methodology will allow the benefits to be accounted for in the Hot Water Energy Demand.
Water consumption
≤ 125 l/p/day
Notes
Yes The overall water consumption to be calculated in line with the “The water
efficiency calculation methodology” to be developed by SEAI
Evidence = Specification of water usage devices, calculations,
manufacturer’s product information
No Default
24. 24 www.seai.ie
Water Heating – collecting the data
• Survey form updated to include record of shower & bath details
25. 25 www.seai.ie
Water Heating – impact of changes
• Part L compliance – Water heating demand impacts EPC / CPC
Reference Dwelling
No. of showers Same as actual dwelling
Bath in dwelling Same as actual dwelling
Shower type Vented hot water system + pump (12 l/min)
Flow restrictor None
WWHR None
Water consumption Greater than 125 l/p/d
26. 26 www.seai.ie
Water Heating – Impact of changes
• Two homes which currently have the same BER but have different shower types, will have
different ratings in future
0
500
1000
1500
2000
2500
DEAP 3 DEAP 4
2 showers & bath
DEAP 4
flow restrictors
DEAP 4
flow restrictors &
<125 l/p/day
Hot water energy requirement at taps
(kWh/y)
28. 28 www.seai.ie
Lighting – Changes to lighting demand calculation
Portable Lighting:
• Efficiency improved based on UK Household Electricity Survey
Fixed lighting:
• Lighting Design Known: input wattage and efficacy based on design of the
installed lighting
• Lighting Design Unknown: the assessor enters no. of each lamp type
29. 29 www.seai.ie
Lighting – Changes to lighting demand calculation
Benefits:
• Takes account of different lighting designs
• Takes account of new high performance light fittings, such as LEDs
• Where lighting is overdesigned, the additional energy use is accounted for
• Where lighting is under-designed, the lighting is supplemented with
portable lighting, therefore encouraging adequate lighting to be designed.
31. 31 www.seai.ie
Lighting – Lighting Design Known
Input
• Enter Lamp Power in Watts
• Enter lamp efficacy in lumen/watt if available or default lumen/watt is applied
32. 32 www.seai.ie
Lighting – Lighting Design Unknown (default)
Input
• Number of each bulb type
• Applies default lumen/watt based on lamp type
Lamp Type Linear Fluorescent LEDs/CFLs Halogen LV Halogen Lamps Incandescent
Lumen/watt 80.5 66.9 26.1 15.7 11.2
35. 35 www.seai.ie
Ventilation – Changes to MVHR input
• Efficiency adjustment factor for MVHR systems where ductwork outside the insulated dwelling
envelope is uninsulated.
• Reduces heat exchanger efficiency by 15% Increases ventilation heat loss
36. 36 www.seai.ie
Ventilation – Changes to MVHR input
Insulated ducting outside of
thermal envelope
Notes
Yes All of the duct system outside the dwelling envelope should be
continuously insulated to a minimum depth of 25mm with
thermal conductivity of 0.04 W/mK or less as required by the
UK domestic ventilation compliance guide.
Evidence = Confirm on site and/or confirmation from installer
No Default
N/A No ducting outside of thermal envelope
Record on survey form
38. 38 www.seai.ie
Renewable Energy Ratio (new dwelling compliance)
• Calculated in line with ISO 52000
• Included:
• PV
• Solar
• Wind
• Heat Pump
• Biomass/ Biogas
• District heating
• CHP
39. 39 www.seai.ie
Renewable Energy Ratio (new dwelling compliance)
• RER requirement of 0.20 or 20% will replace the existing requirement of
10 kWh/m2/yr contributing to the thermal load or 4 kWh/m2/y electrical
RER = Primary Energy of the Renewables (Epren)
Total Primary Energy (Eptot)
• Epren = sum of the delivered renewable energy multiplied by the renewable primary energy factor
• Eptot = sum of the total delivered energy multiplied by the renewable and non renewable primary
energy factors.
40. 40 www.seai.ie
Renewable Energy Ratio (new dwelling compliance)
• Calculate electricity generated by the on-site PV, in kWh.
• Generated electricity is multiplied by the PEF of the PV to determine the total and renewable primary
energy.
PV Example Delivered Energy PEF Primary Energy
Main space 3521 1.1 3873
Secondary space 770 1.1 847
Main water 2423 1.1 2665
Supplementary water 0 0 0
Pumps, fans & electric showers 130 2.08 270
Lighting 272 2.08 566
PV - 1224 2.08 -2546 (Epren)
Total 5675 (Epnren)
RER = Epren = 2546 kWh/y
Eptot = 5675 + 2546 = 8221 kWh/y = 0.31
41. 41 www.seai.ie
Renewable Energy Ratio (new dwelling compliance)
Heat Pumps
• The environmental renewable contribution is calculated based on the
• Space Heating Demand and
• Hot Water Demand
• Demand provided by the heat pump minus the energy consumed by the
heat pump
42. 42 www.seai.ie
Renewable Energy Ratio (new dwelling compliance)
HP Example Delivered Energy PEF Primary Energy
Main space 538 2.08 1119
Secondary space 447 1.1 492
Main water 949 2.08 1974
Pumps, fans & electric showers 175 2.08 364
Lighting 272 2.08 566
Total 4,515 (Epnren)
RER = Epren = 2966 kWh/y
Eptot = 4515 + 2966 = 7481 kWh/y = 0.40
HP Example Heat Use HP % Elec. Use (Del. Energy) Environmental Energy
Main space 2365 4.4 538 1827
Main water 2088 2.2 949 1139
Total 2966 (Epren)
44. 44 www.seai.ie
Document updates
• DEAP manual version 4.2.0
• Survey Guide version 3.0
• Survey Form
• Technical Bulletin
• Non-default Y-values
• Non-default flow temperatures
for heat pumps
• Accounting for decentralised
mechanical ventilation systems
45. 45 www.seai.ie
Future DEAP updates – public consultation
Heat Pump Methodology to be updated to include:
• Revised standard EN15316-4-2 updated from 2008 to 2017
version
• Direct-exchange (DX) heat pumps
• Gas fired heat pumps (GAHP)
• Low temperature heat pumps for space heating only
• Exhaust air heat pumps (EAHP)
• Double-duct heat pumps and heat recovery systems
incorporating heat pump functionality
• New approach to bivalent systems and clarification for buildings
heated by more than one heat pump
• Accounting for the “degradation coefficient” in oversized heat
pumps
• Other calculation refinements
46. 46 www.seai.ie
Future DEAP updates – public consultation
Exhaust Air Heat Pumps – Renewable
Contribution
• Renewable Contribution in line with
Renewable Energy Directive
• % Renewable based on load
provided by Heat Pump versus load
provided by Heat Pump and
Ventilation system specific to Irish
weather data
47. 47 www.seai.ie
Future DEAP updates
• Allowance for 2 main heating systems where present
• Fixed Cooling accounted for in calculation
• High Heat Retention Storage Heaters
• Review of Primary Energy Factors
• Integrated Thermal Bridging Tool & further guidance
• Integrated overheating risk assessment tool
• Technical Review and guidance on group heating & district heating
48. 48 www.seai.ie
Further Reading
• Proposed Changes to the DEAP Methodology for Part L 2018 Public Consultation
https://www.housing.gov.ie/sites/default/files/public-consultation/files/part_l_public_consultation_deap_methodology_for_nzeb.pdf
• TGD L 2019 Dwellings (to be published shortly)
• BRE SAP Technical Papers
• Consultation Paper: CONSP:08 Hot Water
• Consultation paper: CONSP:05 Lighting
https://www.bre.co.uk/sap2016/page.jsp?id=3619
49. Questions?
If in doubt, check with the BER helpdesk
Call: 1890 252 738
Email: registered@ber.seai.ie