david garvin product manager earthdirex geothermal copyright © 2015 nortek inc. all rights reserved
TRANSCRIPT
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David GarvinProduct Manager
EarthDirEX Geothermal
Copyright © 2015 Nortek Inc. All rights reserved.
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Agenda
• Why EarthDirEX?• Challenges• Ground loops• Features• Charging
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Why EarthDirEX?
• No outdoor unit• 30% Tax Credit (until Dec. 31, 2016) • Stable sub-surface temperature• Less maintenance
• No pump, no glycol and no outdoor coil, no fan motor
• Lower operating cost and installed cost• 60% Less drilling = lower cost boreholes
• Direct exchange ~80’/ton • Water source ~200’/ton
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Definition - Challenges
• Direct Exchange -There’s no water, no pump, no refrigerant to water heat exchanger. All these items do is reduce system efficiency.
• Heat exchanger is in direct contact with the Earth. • But copper will corrode in the ground!• Less than 1% of the ground is corrosive to copper• Its illegal to bury refrigerant tubing!
• DOE/EPA approved direct exchange
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EPA Letter
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Earth Loop Sizing
• Two ways to size Earth Loop• use the climate zone map• use the formula below
• Cooling load ÷ heating load =• less than 1, then use 65' per ton• between 1 and 1.75, then use 80' per ton• greater than 1.75, then use 100' per ton
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Sizing is 65, 80 or 100 feet per ton depending on the climate zone
65 ft/ton
80 ft/ton
100 ft/ton
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Sizing Earth loops
ft/ton 65 80 100 65 80 1002 130 160 200 2 130 165 2003 195 240 300 3 200 250 3254 260 320 400 4 280 325 4005 325 400 500 5 325 400 2/250
12 possible 7 unique to build
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Earth Loops
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Earth Loops
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Earth Loop
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Some Earth Loop Details
• Watch out for corrosive ground • Stay away from a ph below 5.5 or over 11
• All liquid lines are ½ inch • Encased in a 1 inch plastic pipe• A vacuum must be pulled before backfilling
• 2 vapor lines are used in the Earth loop • Coming out of the Earth loop is one vapor line
• Up to 250 foot loops are ¾ inch vapor line• Over 250 foot loops are 7/8 inch vapor line
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More Earth Loop Details
• The liquid line and the vapor line from the Earth loop to the compressor unit should be buried the deeper of 1.5 feet or below the maximum frost line
• Must insulate both lines from the top of the Earth loop to the compressor section with heavy duty ¾ inch closed cell insulation, capable of withstand 220°f degree
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Features
• One bi-directional EXV in compressor section
• Interface control board• Oil separator• Accumulator with sight glass & float
ball for charging• Earth loop seal valve
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Efficiency and capacities
Cooling Capacity EER
Heating Capacity COP
2 ton 29400 23.8 21000 4.2
3 ton 42000 21.3 35200 4.1
4 ton 57000 20.1 46500 4.2
5 ton 71000 19.3 58000 3.9
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Match ups
Compressor Section
Air Handler
Y1SA-024 B6EMMN036K-B
Y1SA-036 B6EMMN036K-B
Y1SA-048 B6EMMN060K-C
Y1SA-060 B6EMMN060K-C
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Refrigerant Charging
Start In Heating Mode & Charge To Sight Glass• let system operate 15 min• check sight glass, add R410A• when the ball is floating in the middle - done
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Oil Separator
• Temprite coalescent filters will pick up all dirt and particulates down to 0.3 microns
• Typical filter/driers only catch 50 microns or larger
• A second filter (shipped with the unit) is to be used as a replacement in 24 to 48 hours (no more then 5 psi drop)
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Heating To Cooling Transition
• The compressor section includes a hot gas valve• After heating cycle, the earth loop temperature is low
– it was just operation as the evaporator
• In cooling the refrigerant returning to the compressor section could be two phase (flashing)
• In cooling mode after 3 minutes of operation, if the suction pressure drops below 95 psig (29°F), a hot gas solenoid valve opens for 10 seconds every 3 min.
– Compressor discharge gas is injected into the outlet of the EXV in the compressor box
• This process will repeat until the suction pressure is above 95 psig
• If after 60 hot gas injections, the suction pressure is still below 95 psig, the system will go into soft lock out for 60 minutes
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Well Seal Valve
• In 4 and 5 ton systems, the compressor section is equipped with a earth loop seal valve assembly to keep the refrigerant in the earth loop during the off cycle
• The assembly consists of a vapor line solenoid valve and a check valve for cooling mode
• The solenoid valve is opened during heating mode operation• The purpose of this assembly is to:
– Minimize the chance of refrigerant leaking indoors during the off cycle– Minimize the chance of leaking a large amount of refrigerant
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Nortek Global HVAC is a subsidiary of Nortek Inc. © 2015 Nortek Inc., All Rights Reserved.
Questions?