Lithium Battery Dry-Room Calculators

Four quick estimators for sizing, energy, dew-point targeting, and humidity conversion. These are engineering approximations for early scoping — a Koven Air verification calculation confirms the final specification.

1 · Moisture-Load & Dehumidifier Sizing

From room size, air changes, and dew points, estimate the process airflow and moisture-removal duty your dehumidifier must deliver.

Room volume (m³) — or use L×W×H below

Air changes per hour (ACH)

Air dew point entering the unit (mixed/return, °C)

Target room dew point (°C)

—

Process airflow (m³/h)

—

Moisture removal duty (kg/h)

Enter the dew point of the air actually reaching the rotor — mostly recirculated dry-room air in a sealed room (≈ −15 to −20°C), or the outdoor dew point for a 100%-fresh-air design (which multiplies the duty). Δ humidity ratio via Magnus saturation × 1.2 kg/m³ density; infiltration and internal loads add to this — an estimate, not a final duty.

2 · Regeneration Energy & Heat-Pump ROI

Compare annual regeneration electricity for conventional electric heat vs a high-temp heat pump, and estimate simple payback.

Conventional regen electric power (kW)

Operating hours / year

Electricity rate ($/kWh)

Heat-pump regen reduction (%)

Heat-pump price premium (capex, $) — optional

—

Annual electricity saving ($)

—

Simple payback (years)

Saving = conventional annual × reduction%. Published vendor/peer-reviewed examples put heat-pump regen cuts in a ~60–88% band; the exact figure depends on your baseline, waste-heat recovery, and rate. Illustrative only.

3 · Dew-Point Ladder Selector

Pick your process zone to see the typical dew-point target, indicative air changes, and the right-sizing note — over-drying wastes energy.

Process zone

Zone	Dew point	Air changes	Note
General dry-room / return	−30 to −45°Cdp	—	RH < 1%
Cell assembly (baseline)	−40 to −45°Cdp	~30–60 ACH	Mainstream design point
Deep cell assembly	−60°Cdp	~180 ACH	Energy rises steeply — justify it
Electrolyte filling (critical)	down to −80°Cdp	Higher (micro-env)	Micro-environment, not whole room

No single mandatory global dew-point standard exists; the target comes from your process specification. Cleanliness is graded separately to ISO 14644-1.