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Material is primarily intended for further-education purposes for professional workers. Material can be used in teaching in classroom or self-study.
Teachers and students can use the power point material as a whole or they can pick up the most useful parts.
Including: HVAC maintenance and energy efficient renovations.
Co-funded by the intelligent Energy Europe Programme of the European Union. The sole responsibility for the content of this publication lies with the authors. It does not necessarily reflect the opinion of the European Union. Neither the EASME nor the European Commission are responsible for any use that may be made of the information contained therein.
The good practices and principles required for the energy efficient building have been included in the teaching material. The writers are not responsible for their suitability to individual building projects as such. The individual building projects have to be made according to the building design of the targets in question.
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Combined Space and Water Heating: Making it Work
1. Combined Space and Water Heating:
Making it Work
High Efficiency Heating in a Single Package
Ben Schoenbauer, Center for Energy and Environment
Jake McAlpine, Sustainable Resource Center
February, 26th, 2014
2. In accordance with the Department of Labor and
Industry’s statute 326.0981, Subd. 11,
“This educational offering is recognized by the Minnesota
Department of Labor and Industry as satisfying 1.5 hours
of credit toward Building Officials and Plumbing
continuing education requirements.”
For additional continuing education approvals, please see
your credit tracking card.
Pg. 2
3. About CEE
The Center for Energy and Environment (CEE) is a
nonprofit organization that promotes energy efficiency to
strengthen the economy while improving the
environment.
CEE conducts research and develops programs so that:
• Businesses operate more efficiently and profitably;
• Government agencies and nonprofits spend less on
facilities and functions;
• Utilities achieve their energy-efficiency goals at leastcost; and
• Households save money and improve comfort.
Pg. 3
4. About SRC
• The Sustainable Resources Center is a nonprofit
community organization dedicated to creating healthy
and efficient home environments for all residents.
• SRC works with homeowners to create healthy homes
by providing:
•
•
•
•
Detailed energy audits and building testing
Air sealing and insulation services
Lead testing and mitigation
Radon testing and mitigation
Pg. 4
5. Project Support
• Sustainable Energy Resources for Consumers (SERC)
• Department of Energy
• Created to allow local weatherization agencies to install
weatherization materials and technologies that have promise
for energy savings and benefits to customers, however cannot
currently be installed under the traditional Weatherization
Assistance Program.
• Building America
• Department of Energy
• Conducts research to continually develop innovative, costeffective energy saving solutions—better products, better new
homes, better ways to improve older homes, and better
buildings in which we work, shop, and lead our everyday lives.
Pg. 5
6. What are Combination Systems?
• Combination Systems…
• Use a single heating plant to provide both space and water
heating
• Systems can provide space heat with hydronic or forced air
distribution
• Also Known As
• Combi
• Combo
• Dual Integrated Appliances
Pg. 6
7. Why use a high efficiency combined
system?
• Combining loads…
•
•
•
•
•
•
•
•
Improved space and water heating performance
Reduced installation costs
Reduced venting needs
Reduced gas piping
Potentially reduced maintenance
Easy integration with ventilation, air conditioning, etc
Good for retrofits
Good for low load and continually improving homes
Pg. 7
8. Our Focus: Systems that Work
• Our Priorities
•
•
•
•
•
Safety
Reliable
Easy to install
Easy to operate and maintain
Energy Savings
Pg. 8
10. System Types
• DHW options
• Indirect tank
• Integrated tank
• Low mass heat exchanger
• Space heating options
• Radiant
• Radiators
• Baseboards
Indirect Tank
Pg. 10
11. Installation of Condensing Boiler
• Venting
• Combustion air
• Circulation pump
• High efficiency
• Variable frequency
• Space heating distribution size and type (new
construction)
Pg. 11
12. Condensing Optimization
• Baseboard
• Supply Water Temperatures: 170 °F to 190 °F
• Return Water Temperatures: 150 °F to 170 °F
• High Performance Baseboard
• Supply Water Temperatures: 120 °F to 150 °F
• Return Water Temperatures: 100 °F to 130 °F
• Radiant Heating
• Supply Water Temperatures: 100 °F to 120 °F
• Return Water Temperatures: 80 °F to 100 °F
Pg. 12
14. Retrofit Upgrade
• Reduce return water temperature
• Increased the temperature drop through distribution
• More output
• Lower flow rates
• Reduce set point temperature
• Aggressive outdoor reset
• Purge boiler to indirect tank to reduce loses at end of
space heating event
Pg. 14
15. Controls
• Cycle Management
• Avoid short cycling
• Pre purge
• Post purge
• DHW utilizing waste heat
• Outdoor reset
• Aggressive resets minimize return water temperatures
Pg. 15
18. System Types
• DHW Options
• Water heaters
• Storage
• Tankless
• Hybrid
• Boilers
• Indirect tank
• Internal – low mass HE or storage
• Space heating
• Air handler
• Air handler integration with heat recovery ventilation
• Air handler integration with air conditioning
Pg. 18
21. System Selection
• Safety
• Combustion
• Scalding
• Maintenance and durability
• Ease of Installation and Use
• Performance
• User satisfaction
• Energy Use
Pg. 21
22. Air Handler Selection
• Important Characteristics to consider:
• Capacity
• Return water temperature
• Electric usage
• Equipment
• Coil characteristics and heat transfer rates
• Fan characteristics
• Pump characteristics
Pg. 22
37. Programs: Lessons Learned
• Assessing the needs of the home and letting that
inform the system that is installed
• number people and showers and how that effects comfort
• water quality
• thermostat set points and setbacks
• Code officials
• ask first, install second!
• Having good contractors
• learning curve
• training
Pg. 37
38. Programs: Lessons Learned
• Bids
• when do they work?
• retrofit vs. new build
• The roll of product reps
• distribution of products
• technical and warranty assistance
• Ensuring quality of installation
• equipment specific requirements
• field verification of installation
• optimization and maintenance
Pg. 38
41. Conclusions
• These systems can be economically installed with
homeowner satisfaction and safety as well as good
performance
• Hydronic systems are more common, but high
efficiency performance is often overlooked
• Simplicity and durability are key for forced air systems
• Storage tanks and oversized air handlers
• More information available at
• www.mncee.org/dia
Pg. 41