Savings through the Proper Installation of Combined Heat and Hot Water Systems
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1 August 20, 2014 Savings through the Proper Installation of Combined Heat and Hot Water Systems 2014 Industry Partner Meeting Ben Schoenbauer Senior Research Engineer
2 What we do Engineering Services Innovation Exchange Research Education and Outreach Sound Insulation Program Public Policy Lending Center Energy Program Design and Delivery Pg. 2
3 Sponsors and Partners NorthernSTAR - A DOE Building America Research Team Sustainable Energy Resources for Consumers Grants Center for Energy and Environment Sustainable Resources Center University of Minnesota The Energy Conservatory Pg. 3
4 Agenda Introduction to Combination Systems Savings Potential Best Installation Practices Home Assessment Combi Equipment Installation Optimization Verification Performance Conclusions Pg. 4
5 Energy Savings Potential LIWX agency installed 200+ in Twin Cities metro Typically replaced a 80% AFUE furnace and a 0.59 EF water heater Utility bills showed an median savings of 13% 11 home detailed pre/post analysis Savings of 16% Pg. 5
6 Savings Installed Efficiency Rated Efficiency Heating Plant Winter Summer Annual Rating Method Rating Space Heat DHW StWH 86% 87% 60% Thermal Efficiency 95% TWH 86% 85% 85% Energy Factor 93% HWH 90% 92% 61% Energy Factor 95% Existing 1 71% 72% 47% AFUE/Energy Factor 79% / 59% Pg. 6
7 Home Assessment Space Heating Load Manual J DHW Load Number of bathrooms/number of people Inlet water temperature Pg. 7
8 Installation Codes Open loop requires hydronic air handlers and pumps rated for potable water Stagnation prevention mode Lack of familiarity of codes officials Can water heaters be used for space heat? Closed loop system required? Other concerns??? Pg. 8
9 Installation Special equipment Venting Mixing valve Condensate pump Air Handler flow rate control valve DHW Mixing Valve Storage Water Heater Hydronic Air Handler AHU Control Valve Condensate management Pg. 9
10 Installation: Venting Venting B-Vent Direct Pg. 10
11 Installation: Mixing Valve Pg. 11
12 Installation: Condensate Management Pg. 12
13 Installation: Air Handler Control Valve Pg. 13
14 Installation Other considerations May need to install an electric outlet for the water heater May need to increase the size of the gas line or even the gas meter/supply line Hybrid and tankless water heaters typically can be wall mounted which will reduce system footprint can also mean changing the location of the plumbing Pg. 14
15 No Optimization Pg. 15
16 Improved Installation Pg. 16
17 Fully Optimized Pg. 17
18 Verification 3 Tiers of Verification Approved Equipment Verification Measures Trained Contractor Verified Performance Expected Performance Space Heat 80% of Optimal 90% of Optimal DHW Optimal Optimal Optimal Optimal Pg. 18
19 Performance: Field Monitoring Conditioned Space Cold In from Mains DHW Loads Ambient T Hot Space Heating Air Water Temp Water Flow Air Temp Air Flow Consumption Supply to AH Water Heater Return from AH Hydronic Air Handler Electric Gas Electric Pg. 19
20 Performance Delivered air temperature may be slightly cooler than a furnace Hot water may change slightly depending on water heater type Maintenance and durability Pg. 20
21 Water Temperature Delivery Hybrid (Cond) Storage (Cond) Tankless (Cond) Storage (non-cond) Pg. 21
22 Performance Pg. 22
23 Performance: Stand-by Loss Pg. 23
24 Performance Pg. 24
25 Installed Performance Pg. 25
26 Cost Pg. 26
27 Conclusions Condensing combi systems can achieve efficiencies equal to or slightly greater than a condensing furnace and PV water heater Oversize the hydronic air handlers Carefully adjust water flow, air flow, and heater setpoint to achieve return water temperature < 105F Work with code officials to address their concerns prior to installations New water heaters and air handlers should improve performance (and lower cost?) Pg. 27
28 Future Water Heaters Air Handlers ASHRAE 124 method of test is being updated and would include integrated water heaters and air handlers provide method for higher efficiency systems for utility incentives Pg. 28
29
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