Climate Battery Greenhouse Calculator

Underground Air Planner

Climate Battery Greenhouse Calculator

Size airflow, pipe runs, burial depth, and soil storage for a climate battery that moves greenhouse heat into the ground and back again.

Presets10 layoutsreal greenhouse scales
Results4 cardsarea, air, tubes, storage
References4 tablesairflow and storage data
UnitsMetric or imperialone-click conversion
🌱Preset Greenhouse Builds

Pick a real greenhouse layout to seed the fields. Each preset sets footprint, height, airflow, pipe speed, burial depth, storage depth, and soil moisture.

Calculator Inputs
Formula: floor area sets greenhouse volume, ACH sets airflow, tube diameter and speed size the runs, and soil mass plus swing estimate storage.

Climate Battery Output

Calculated from greenhouse footprint, ventilation target, buried pipe geometry, and active soil storage.

Active floor area
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Design airflow
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Tube length target
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Usable storage
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Calculation Breakdown
Footprint shape-
Floor area-
Greenhouse volume-
Target ACH-
Total airflow-
Pipe diameter-
Target pipe speed-
Actual pipe speed-
Tube runs-
Tube length-
Soil volume-
Soil density-
Soil heat capacity-
Temp swing-
Usable storage-
Daily fan runtime-
Air moved per day-
Coverage share-
Overage buffer-
📊Design Comparison Grid
Pipe speed-Benchmark 6-10 m/s
Tube depth-Benchmark 1.5-3 m
Air changes-Bench 5-20 ACH
Layout fit-Pipe load check
📈Earth Tube Airflow Benchmarks
ModeExampleFlowNote
Minimum cycle5 ACHTurnover in 12 minHowToGoSolar SHCS
Strong loop20 ACHTurnover in 3 minOneCommunity target
Peak cooling0.75-1 vol/min25.2-33.7k CFM950 m3 greenhouse
Test rig1060 CFM3178 ft3 houseVT earth tube study
📍Burial Depth Benchmarks
DepthMetricSoil bandNote
5 ft1.5 mLower bandBC report low end
8 ft2.4 mField testVT greenhouse rig
10 ft3.0 mCommon bandBelow frost line
12 ft3.7 mDeep storageNear 50 F soil
💡Thermal Storage Benchmarks
MaterialDensityCpVolumetric cap
Water1000 kg/m34.18 kJ/kgC4.18 MJ/m3C
Sandy ground1520 kg/m31.65 kJ/kgC2.51 MJ/m3C
Wet soil1700 kg/m31.30 kJ/kgC2.21 MJ/m3C
Concrete2400 kg/m30.75 kJ/kgC1.80 MJ/m3C
📋Pipe Layout Benchmarks
PipesSpacingExample flowNote
2 pipes5.0 m120 cfmLow density
3 pipes2.7 m120 cfmEarly gain
5 pipes2.7 m1633 kWh/yrGood gain
8 pipes1.8 m1832 kWh/yrStrong gain
📖Practical Tips
Tip: Dense, moist soil stores heat better than dry sand, so compact the battery zone carefully and keep drainage reliable.
Tip: Even pipe runs and matched fan flow help every circuit share the load, which keeps airflow and temperature more uniform.
Benchmarks here are based on published earth-tube and climate-battery studies, then converted into a single planning workflow for greenhouse sizing.

A climate battery use the soil to store thermal energy, and a climate battery uses that stored thermal energy to regulate the greenhouse temperature. A climate battery works by absorb the heat from the sun, and then later releasing that heat into the greenhouse. Greenhouse temperature can fluctuate widely; it can be too hot during the day within the greenhouse, and too cold at night.

However, using a climate battery help to prevent these fluctuations in temperature; the climate battery uses the soil as a heat sink to store and release the needed heat energy into the greenhouse as needed. Another factor that impact the effectiveness of a climate battery is the relationship between the movement of the air within the greenhouse and the mass of the soil. In order to effective use the soil as a heat sink, the air must move at a specific rate through the pipes.

How a Climate Battery Keeps Greenhouse Temperature Stable

If the air move too slowly through the greenhouse, the heat will not be able to transfer to the soil to store the energy. However, if the air moves too quickly through the greenhouse, the air will not have time to transfer the heat from the air to the pipes. The depth at which the pipes are buried in the soil is another factor that will impact the climate battery.

If the pipes are buried too shallow in the soil, the heat will escape from the pipes into the atmosphere. Instead, the pipes should be buried deep into the soil where the temperatures is stable. If the pipes are buried deep into the soil, the heat stored in the soil during one month can be used during a later month.

This concept is referred to as a thermal lag. The type of soil in which the pipes are placed will also impact the efficiency of the climate battery. Sandy soil can hold some thermal energy, but moist and dense loam soil will hold more heat energy then sandy soil.

Soil that contains water will release more heat than dry soil; water is a good conductor of heat. Therefore, if the soil becomes too dry, the climate battery will be unable to store as much heat as it should of been able to. The number of pipe runs that are created for the climate battery will impact the movement of the air through the soil.

If there are too few pipe runs, the air will not come in contact with all of the pipe. Therefore, creating multiple pipe runs will allow the air to come into contact with more of the soil, and increase the ability of the climate battery to heat the greenhouse. Using too few pipe runs can cause issues where the air does not come into contact with the pipes; air moves too quickly through the pipes without transfer heat to the soil.

Air changes per hour, or ACH, is used to convey the rate at which the air move through the climate battery. A low ACH means that the air is moving slowly through the climate battery, while a high ACH means that the air is moving fastly through the climate battery. A high ACH is required for the greenhouse to handle the temperature increase that occur on sunny days.

When installing the climate battery, it is important to ensure that the length and resistance of each pipe run are even. If one pipe run is shorter than the others, more air will move through the short pipe run than through the long pipe runs. This would cause the climate battery to not function as intended for the air will not move through each of the pipes.

The pipe runs need to be even in length created in order to allow the fan to move the air through each of the pipes in the greenhouse. Thus, the climate battery will function properly to create a stable temperature within the greenhouse by using the soil to store and move the heat energy. Its important to make sure that you’re setup is moddern and comfortabley designed.

Youll need to recieve alot of advice from experts so that you dont make mistakes with the furnitures. Actually, the rooms size and the sofas length could also affect things based off the airflow.

Climate Battery Greenhouse Calculator

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