Climate Battery Calculator v2.0

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Location & Climate Data — Click the Map to Auto-Fill Climate Fields

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Climate zones: Very Cold (>9000 HDD) Cold (6500–9000) Mixed (4000–6500) Warm (2000–4000) Hot (<2000 HDD)

☝ Click anywhere on the map or click a station dot to select the nearest climate data.

Selected Location

— No location selected —

✓ Climate data applied to Steps 5 & 6

Data includes: Heating/Cooling Degree Days, average temperatures, summer & winter solar insolation, and estimated sunny gain days — all auto-filled into Steps 5 and 6.

Greenhouse Volume Calculator

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Yellow = your inputs Blue = calculated results

Fill in each section that applies to your greenhouse shape, or use the manual entry at the bottom if you already know your volume.

Box Section (straight walls)

Height (ft)

Length (ft)

Width (ft)

Box Volume (cu ft)

Hoop Roof Section (arc = 180° for a half-circle)

Leave at 0 if not applicable.

Arc Included (°)

Radius (ft)

Length (ft)

Hoop Volume (cu ft)

Shed or Gable Roof Section

Peak Height above Wall (ft)

Length (ft)

Width (ft)

Roof Volume (cu ft)

Manual Override

Values entered here override the calculated totals above.

Floor Area (sq ft) — manual

Volume (cu ft) — manual

Total Floor Area (sq ft)

Total GH Volume (cu ft)

Key Ratios

Ballpark Tubing (ft of 4")

Cu ft air per sq ft floor

Total Box Wall Area (sq ft)

Wall+Roof per sq ft floor

Fans & Air Exchange

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Yellow = your inputs Green = data inputs Blue = calculated

Target: at least 5 air exchanges per hour and 2–4 ft/sec air speed in tubing. Field trials show benefit up to 4× more exchanges.

# of Fans / Climate Batteries

Desired Air Changes / Hr

Fan CFM Needed (calculated)

Fan CFM (manufacturer's rating)

Actual Air Changes / Hr

Heat Exchange Tubing

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Green = your inputs Blue = calculated

Standard design: three layers of 25–35 ft ADS tubing. Lengths over 35 ft reduce efficiency. Target air speed: 2–4 ft/sec.

Tubing Layout

# of Climate Batteries (= # fans)

Layers per Battery

Nominal Tube Diameter (in)

Avg Tube Length (ft)

# of Tubes per Layer

Total # of Tubes

Total Tube Area (sq ft)

Total Tubing Length (ft)

Tubing Air Speed (ft/sec)

Manifold & Spacing

Manifold Diameter (in)

ADS Rib Spacing (in)

Rib Spacing Multiplier (# ribs)

Horizontal Tube Spacing (in)

Vertical Tube Spacing (in)

Top Layer Depth (in)

Trench / Excavation Depth (in)

CB Array Width (ft)

CB Soil Volume (cu ft)

Time in Each Tube (sec)

System Hardware Costs

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Green = your inputs Blue = calculated totals

Salvage fans, thermostats, barrels, and culvert materials to reduce costs. Repair, Re-use, Recycle!

Tubing Cost ($/ft, incl. sock)

Total Tubing Cost

Cost per Riser (e.g. 18" N-12 ADS)

Total Riser Cost

Cost per Manifold (e.g. 15" N-12 ADS)

Total Manifold Cost

Cost per Fan

Total Fan Cost

Controls Package (one per GH)

Total Hardware Cost

Energy Payback Calculations

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Green = your inputs Blue = calculated

Soil Heat Mass

Soil Mass (lbs @ 75 lb/cu ft)

Heat Stored per 1°F Rise (BTU)

Your Therm Cost ($/100,000 BTU)

Stored Heat Value per 1°F ($)

Solar Gain Days & Annual Value

Days per year when the greenhouse reaches 90°F and meaningful heat is stored. Colorado ≈ 180 days. NE/NW ≈ 100. Mid-states ≈ 150. FL/SW ≈ 200+.

Sunny Gain Days per Year

Annual Gas Value Gained ($)

Annual Fan Operating Cost ($)

Yearly Net Gain ($)

Fan Power Calculation

Volts

Amps

Wattage (V × A)

Daily Hours of Operation

Daily kWh

Electricity Cost ($/kWh)

Payback Period

— yrs

Climate Effects & Heat Transfer

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Sources: Wunderground.com, DegreeDays.net, Weatherspark.com, NREL Solar Insolation Maps & TMY3 Data. Or use the map above to auto-fill.

Local Climate vs. Aspen, CO Reference (CRMPI baseline)

Metric	Your Location	Aspen, CO (Reference)
Heating Degree Days (Base 65°F)		8,619
Cooling Degree Days		415
Average Yearly Low (°F)		7°F
Average Yearly High (°F)		77°F

Greenhouse Geometry & Insulation

Glazed Roof Area (sq ft)

Insulated Roof Area (sq ft)

Glazed Wall Area (sq ft)

Insulated Wall Area (sq ft)

Glaz. Roof R-Value

Insul. Roof R-Value

Glaz. Wall R-Value

Insul. Wall R-Value

Air Leakage Multiplier

Insul. Curtain Reduction (%)

Interior Design Temp (°F)

Glazing SHGC

Heat Loss Results

Heat Loss Factor (BTU/hr/°F)

Avg Max Heat Loss (BTU/hr)

Solar Heat Gain

Summer Sun Area (sq ft)

Summer Daily Insolation (kWh/m²/day)

Summer Daily Heat Gain (BTU/day)

Summer Max Insolation (W/m²)

Summer Hourly Heat Gain (BTU/hr)

Winter Sun Area (sq ft)

Winter Avg Daily Insolation (kWh/m²/day)

Winter Daily Heat Gain (BTU/day)

Winter Avg Insolation (W/m²)

Winter Hourly Heat Gain (BTU/hr)

Heat Transfer to Climate Battery

CB Intake Temp (°F)

CB Intake Relative Humidity

CB Exhaust Temp (°F)

CB Exhaust Relative Humidity

Latent Heat Factor (research ongoing)

Sensible Heat Transfer (BTU/hr)

Transfer Efficiency (% of winter gain)

Potential Heat Transfer w/ Latent Exchange (BTU/hr)

Heating Cost Comparison — Climate Battery vs. Conventional Fuels

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Based on the annual heat output calculated in Step 5, this compares what that same heating would cost using conventional fuels. Enter current prices for your area.

Annual Heat Output (BTU/yr)

CB Annual Operating Cost

Fuel Prices — Edit for Your Area

Propane ($/gallon)

Natural Gas ($/therm)

Fuel Oil ($/gallon)

Wood Pellets ($/ton)

Electric Resistance ($/kWh)

Heat Pump COP

Annual Cost to Produce the Same Heat — Your Climate Battery vs. Each Fuel

Environmental Impact

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Compared to propane heating as a baseline — the most common greenhouse supplemental fuel. EPA emissions factor: 5.75 kg CO₂ per gallon of propane.

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Gallons of propane displaced / year

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Metric tons CO₂ avoided / year

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Equivalent trees planted / year

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CO₂ avoided over 20 years (metric tons)