Ductless Heat Pumps for Passive Houses

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1 7 th th Annual North American Passive House Conference September 27-30, 2012 Denver CO Ductless Heat Pumps for Passive Houses Mark T. Kuntz, PE, LEED-AP Mitsubishi Heating and Cooling

2 7 th th Annual North American Passive House Conference September 27-30, 2012 Denver CO Session Learning Objectives: Gain an understanding of the unique features and benefits of ductless heat pump technology Select the proper ductless heat pump based on load calculations and climate conditions Determine the optimal indoor unit type and locate it for proper airflow distribution Interpolate energy usage data from the product specification tables for use in the PHPP software

3 Mitsubishi Electric HVAC Division Atlanta, GA 30 years serving the US HVAC industry Split-ductless market leader 6 state-of-the-art training centers 1,100+ stocking distributor branch locations Exclusive Home Depot ductless provider 3 3

4 Ductless Heat Pumps Highly Efficient Up to 26 SEER Up to 10.6 HSPF No ductwork = No duct losses Individual Room Control Variable Speed Operation Constant airflow Excellent dehumidification Continuous filtration Extremely Quiet db Cold Climate Capable 100% capacity at 5 F. 82% capacity at -13 F. 4

5 INVERTER Compressor Over-sizing not an issue Output matches load requirements Comfort levels are reached quickly Extremely low sound levels from both fan and compressor Constant circulation of conditioned air Improves humidity control Reduces hot/cold pockets Warm air delivery at start up in heating mode DC Compressor 5

6 Montana Cold Climate Heat Pump Test NEEA

7 Montana Cold Climate Heat Pump Test NEEA 12,000 BTUH system 23 SEER, 10.6 HSPF Continuous operation well below -10 degrees F Supply air discharge temperature in the 105+ degrees F range COP s between 1.5 and 2.0 during sub-zero operation

8 Multi-Zone Ductless Heat Pumps 2 to 8 indoor units per outdoor 20,000 48,000 BTUH Various indoor styles Wall Ceiling Floor

9 Indoor Unit Flexibility 4-way cassette Low-profile ducted Floor-standing

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12 Wallace Farmstead In Progress 3500 square feet Three comfort zones 6000 BTUH wall mount 9000 BTUH ceiling mount 9000 BTUH ceiling mount Single outdoor heat pump

13 Wallace Farmstead Finished Product Comments from Jesse Thompson, AIA, LEED AP: It's happily sitting at 74 degrees in 95 degree heat, silently and calmly. The heat pumps are outstanding, they just work, quietly and effectively. So far it seems to be a great combination of aesthetics and function. 1.5 tons for a 3,500 SF house feels pretty good...

14 Cold Climate Performance MSZ-FE H2i Heating Performance % Heating Capacity 120% 100% 80% 60% 40% 20% 82% 62% 58% 75% 100% 92% 100% MSZ-FE09 MSZ-FE12 0% Outdoor Temperature (F) 14 14

15 Indoor Unit Placement

16 isee Comfort Sensor isee Comfort Sensor improves comfort & efficiency Senses and controls for temperature felt by people in room Helps prevent over cooling or under heating Automatically adjusts fan speed and side-side louvers 16

17 ECONO COOL Adjusts air directed towards the body based on leaving air temperature. Set temperature automatically adjusts (up to 4 F) without loss in comfort Up to 20% increase in efficiency ECONO COOL Operation Cool Mode 17

18 Indoor Air Quality Benefits 1 HYBRID 2 ANTI- 3 PLATINUM CATECHIN ALLERGEN CATALYST PRE-FILTER FILTER FILTER High power odor Antioxidants absorb Blue enzymes help trap absorption through odor-causing gases dust, pollen, mites, and nanotechnology ceramic Wash by rinsing or clean other particles that can surface by light vacuuming Effective for 10+ years with proper care cause allergic reactions, Breaks down Sulfur atom (S-S) bonds in allergens and transforms them into non-allergens Clean with light vacuuming Replace every year for best performance Microscopic pores (less than 10 nanometers in size) absorb microscopic odors Clean with light vacuuming Replace when no longer effectively deodorizing 18

19 Room-to-room Air Transfer Quiet Efficient No ductwork Room-to-room or floor-to-floor

20 Ductless Heat Pump Selection

21 Calculating Energy Usage - Cooling

22 Calculating Energy Usage - Heating

23 Ductless Heat Pump Conclusions DHPs are sized to match Passive House loads DHPs operate at part loads with excellent efficiency and functionality Multi-zone systems add interior flexibility and zonal control Cold climate versions provide excellent performance to -13F An installation and service infrastructure is in place to facilitate projects nationwide Extensive literature, case studies and supporting material can be accessed at