0
Combined Space and Water Heating:
Making it Work
High Efficiency Heating in a Single Package

Ben Schoenbauer, Center for ...
In accordance with the Department of Labor and
Industry’s statute 326.0981, Subd. 11,
“This educational offering is recogn...
About CEE
The Center for Energy and Environment (CEE) is a
nonprofit organization that promotes energy efficiency to
stren...
About SRC
• The Sustainable Resources Center is a nonprofit
community organization dedicated to creating healthy
and effic...
Project Support
• Sustainable Energy Resources for Consumers (SERC)
• Department of Energy
• Created to allow local weathe...
What are Combination Systems?
• Combination Systems…
• Use a single heating plant to provide both space and water
heating
...
Why use a high efficiency combined
system?
• Combining loads…
•
•
•
•
•
•
•
•

Improved space and water heating performanc...
Our Focus: Systems that Work
• Our Priorities
•
•
•
•
•

Safety
Reliable
Easy to install
Easy to operate and maintain
Ener...
Hydronic Combi Systems

Pg. 9
System Types
• DHW options
• Indirect tank
• Integrated tank
• Low mass heat exchanger

• Space heating options
• Radiant
...
Installation of Condensing Boiler
• Venting
• Combustion air
• Circulation pump
• High efficiency
• Variable frequency

• ...
Condensing Optimization
• Baseboard
• Supply Water Temperatures: 170 °F to 190 °F
• Return Water Temperatures: 150 °F to 1...
Condensing Optimization

Radiant

High Performance Baseboard

Baseboard
Retrofit Upgrade
• Reduce return water temperature
• Increased the temperature drop through distribution
• More output
• L...
Controls
• Cycle Management
• Avoid short cycling
• Pre purge
• Post purge

• DHW utilizing waste heat
• Outdoor reset
• A...
Performance

Pg. 16
Forced Air Systems

Pg. 17
System Types
• DHW Options
• Water heaters
• Storage
• Tankless
• Hybrid

• Boilers
• Indirect tank
• Internal – low mass ...
Best Practices
•
•
•
•
•

Installation
Optimization
Operation
Controls
Lessons Learned

Pg. 19

19
Installation

EXISTING

COMBI

Pg. 20
System Selection
• Safety
• Combustion
• Scalding

• Maintenance and durability
• Ease of Installation and Use
• Performan...
Air Handler Selection
• Important Characteristics to consider:
• Capacity
• Return water temperature
• Electric usage

• E...
Heating Plant Sizing

Pg. 23
Venting

Non-Condensing
Two Pipe

Concentric
Non-sealed

Pg. 24
Optimizing Efficiency

Pg. 25
No Optimization

Pg. 26
Improved Installation

Pg. 27
Fully Optimized

Pg. 28
Installed Performance

Pg. 29
Water Temperature Delivery

Hybrid (Cond)

Tankless (Cond)

Storage (Cond)

Storage (non-Cond)

Pg. 30
Delivered Air Temperature

Storage WH
Tankless
Hybrid WH

Pg. 31
Stand by Loses

Pg. 32
Stand-by Loses

Pg. 33
Savings

• From field monitoring
Pg. 34
Cost

Pg. 35
Controls
•
•
•
•
•

Outdoor reset
Air handler fan modulation
Air handler pump modulation
Load matching
Set back control fo...
Programs: Lessons Learned
• Assessing the needs of the home and letting that
inform the system that is installed
• number ...
Programs: Lessons Learned
• Bids
• when do they work?
• retrofit vs. new build

• The roll of product reps
• distribution ...
Calculated versus Actual Load

Pg. 39
Calculated versus Actual Load

Pg. 40
Conclusions
• These systems can be economically installed with
homeowner satisfaction and safety as well as good
performan...
Ben Schoenbauer
Jake McAlpine
Upcoming SlideShare
Loading in...5
×

Combined Space and Water Heating: Making it Work

82

Published on

Published in: Technology
0 Comments
0 Likes
Statistics
Notes
  • Be the first to comment

  • Be the first to like this

No Downloads
Views
Total Views
82
On Slideshare
0
From Embeds
0
Number of Embeds
0
Actions
Shares
0
Downloads
4
Comments
0
Likes
0
Embeds 0
No embeds

No notes for slide

Transcript of "Combined Space and Water Heating: Making it Work"

  1. 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. 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. 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. 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. 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. 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. 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. 8. Our Focus: Systems that Work • Our Priorities • • • • • Safety Reliable Easy to install Easy to operate and maintain Energy Savings Pg. 8
  9. 9. Hydronic Combi Systems Pg. 9
  10. 10. System Types • DHW options • Indirect tank • Integrated tank • Low mass heat exchanger • Space heating options • Radiant • Radiators • Baseboards Indirect Tank Pg. 10
  11. 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. 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
  13. 13. Condensing Optimization Radiant High Performance Baseboard Baseboard
  14. 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. 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
  16. 16. Performance Pg. 16
  17. 17. Forced Air Systems Pg. 17
  18. 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
  19. 19. Best Practices • • • • • Installation Optimization Operation Controls Lessons Learned Pg. 19 19
  20. 20. Installation EXISTING COMBI Pg. 20
  21. 21. System Selection • Safety • Combustion • Scalding • Maintenance and durability • Ease of Installation and Use • Performance • User satisfaction • Energy Use Pg. 21
  22. 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
  23. 23. Heating Plant Sizing Pg. 23
  24. 24. Venting Non-Condensing Two Pipe Concentric Non-sealed Pg. 24
  25. 25. Optimizing Efficiency Pg. 25
  26. 26. No Optimization Pg. 26
  27. 27. Improved Installation Pg. 27
  28. 28. Fully Optimized Pg. 28
  29. 29. Installed Performance Pg. 29
  30. 30. Water Temperature Delivery Hybrid (Cond) Tankless (Cond) Storage (Cond) Storage (non-Cond) Pg. 30
  31. 31. Delivered Air Temperature Storage WH Tankless Hybrid WH Pg. 31
  32. 32. Stand by Loses Pg. 32
  33. 33. Stand-by Loses Pg. 33
  34. 34. Savings • From field monitoring Pg. 34
  35. 35. Cost Pg. 35
  36. 36. Controls • • • • • Outdoor reset Air handler fan modulation Air handler pump modulation Load matching Set back control for both space and DHW systems Pg. 36
  37. 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. 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
  39. 39. Calculated versus Actual Load Pg. 39
  40. 40. Calculated versus Actual Load Pg. 40
  41. 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
  42. 42. Ben Schoenbauer Jake McAlpine
  1. A particular slide catching your eye?

    Clipping is a handy way to collect important slides you want to go back to later.

×