Overview & Core Concepts
What is it? A Fully Environmentally Controlled (Tunnel EC) house is a highly enclosed, insulated rigid structure equipped with evaporative cooling pads, exhaust fans, and automated controllers designed to achieve substantially greater engineered climate control than open or hybrid houses.
How it works & Environmental Control:
- Primary mechanism: Negative-pressure tunnel ventilation and evaporative cooling. Exhaust fans pull fresh air through wet cellulose cooling pads, creating high-velocity longitudinal airflow (2.5–3.5 m/s benchmark) down the length of the shed, generating a 5°C to 7°C wind-chill cooling effect on birds under suitable ambient conditions.
- Environmental control level: High active mechanical control. Automated controllers manage fan staging, pad pump cycles, and static pressure (0.05–0.10 in WC design target) to maintain thermoneutral conditions.
- What the farmer can control: Controller setpoints, fan/pad staging, static pressure calibration, and water quality treatment.
Advantages & Limitations:
- Advantages: High stocking density potential, superior FCR consistency, reduced weather exposure, strongly favored by many commercial integrators.
- Limitations & Key Risks: High capital investment; high electrical dependency requiring automated generator backup; water quality sensitivity (hard water scale damages cooling pads).
- Economic Implications: Higher initial CapEx and recurring utility OpEx, requiring high bird density and consistent production performance to support investment amortization.
What to verify before choosing:
- Is grid power backed by an Automatic Main Failure (AMF) generator sized for 100% fan load requirements?
- Does water laboratory analysis confirm TDS <500 ppm and calcium hardness <120 mg/L guidelines?
- Does local integrator term sheet support the higher CapEx amortization through growing charge volume?
Why This Matters
Fully EC housing provides advanced climate control and stocking density potential, but introduces high dependency on continuous power, backup generators, and treated water quality.