Center Greenhouse Zone

Vanda orchids hanging in the greenhouse center zone

The center is the greenhouse’s airflow and humidity mixing corridor. It has active hanging Vanda orchids, the AquaFog XE 2000, center misters, and center clean/fert wetting paths. It does not have a dedicated climate probe, so control and reporting use derived greenhouse context plus center crop/VPD target policy.

Active Crop Zone

Center Vandas are active crop records and contribute to current crop/VPD target calculation.

Derived Sensor

No dedicated center probe; center conditions are estimated from the greenhouse air mass.

Direct-Wet Window

Defaults to activity +120 min through activity off -180 min.

Current Plantings

CENTER-HANG-1Vanda Orchids (Mixed Vanda) · vegetative

Planted 2026-04-02; 47 days in place.

Control Role

Firmware does not contain Vanda-specific logic. Center behavior is expressed through generic controls:

activity_start_hour, activity_start_minute, and activity_duration_min mirror the main light runtime policy.
direct_wet_center_start_offset_min and direct_wet_center_drydown_before_off_min define the center wettable window.
direct_wet_min_temp_f blocks automated direct wetting when the house is too cold.
irrig_center_days_mask and irrig_center_fert_days_mask schedule center watering and fertigation days.

With the current 06:00-22:00 activity window, center direct wetting is normally permitted from 08:00 to 19:00, subject to temperature, climate demand, irrigation schedule, water budget, and relay interlocks.

Shelves

Center Floor

Kind: floor; Tier: 0; Position scheme: CENTER-FLOOR-{N}

Center Hang

Kind: hang; Tier: —; Position scheme: CENTER-HANG-{1|2}

Sensors

No sensors

No sensors assigned to this zone.

Leaf wetness, root wetness, and PAR at hanging height are roadmap sensors. Until then, center drydown is verified through time windows, runtime evidence, and visual checks.

Equipment

drip_center (Center Drip)

Kind: drip; Model: —; Watts: —; Cost/hr: —

fog (Fog Machine)

Kind: fog; Model: AquaFog XE 2000 HumidiFan; Watts: 1644W; Cost/hr: USD 0.182

mister_center (Center Misters)

Kind: mister; Model: Micro Drip 360; Watts: —; Cost/hr: —

drip_center_fert (Center Drip (fert path))

Kind: valve; Model: —; Watts: —; Cost/hr: —

Water Systems

center_drip_clean (Center Drip (clean))

Kind: drip; Heads: —; Nozzles: —; Mount: Center hanging/root-zone wetting path; Fert: no

center_drip_fert (Center Drip (fert))

Kind: fertigation; Heads: —; Nozzles: —; Mount: Same center wetting path as center_drip_clean, fert supply path; Fert: yes

center_fog (Center Fog)

Kind: fog; Heads: —; Nozzles: —; Mount: Ceiling-mounted; Fert: no

center_mister_clean (Center Misters (clean))

Kind: mister; Heads: 5; Nozzles: 25; Mount: Overhead; Fert: no

Center wetting paths are direct-wet gated. Fertigation additionally requires the fert master valve and the center fert day/schedule decision.

Airflow Role

North Intake

Air enters through the north vent and house-side exchange path.

Center Conditioning

The fog machine blows north-to-south while center misters and wetting paths add moisture when allowed.

South Exhaust

Two fans pull conditioned air toward the 4,900 CFM exhaust end.

Zone Profile

Center Greenhouse Zone

Slug center; status active.

Open floor area

Sensor Modbus addr —.

—

Recorded/known peak temperature.

Active crop records. Position scheme: CENTER-FLOOR-{N}, CENTER-HANG-{1|2}.

→ See Greenhouse Lighting for the activity window that direct wetting follows. → See Known Limits for the current wetness-sensor gap.

Lab