Figidarium and Caldarium

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2 rooms, 1 heat pump. * Initial Conditions ** Sauna and freezer both start at ambient: 14 °C. ** Heat pump is off. * Phase 1: Internal Cycling Begins ** You turn on the single reversible heat pump. ** It begins transferring heat: From freezer → sauna. ** Since both rooms are initially at 14 °C: ** It is most efficient to cycle heat between the two rooms (small delta, high COP). ** No energy is wasted to ambient. * Phase 2: Divergence Reaches Trigger Point ** Sauna climbs past a threshold (e.g., 35–40 °C). ** Freezer drops toward 0 °C or below. ** The temperature gradient between: ** Freezer and sauna becomes large (lower COP). ** Freezer and ambient is now smaller. ** Sauna and ambient is now greater (more efficient to dump heat to ambient). At this point, a controller triggers a valve system to switch modes: * Phase 3: Switch to Ambient Loops ** Freezer circuit starts dumping its heat to ambient air. ** Sauna circuit now draws heat from ambient instead of freezer. ** The internal cycle is effectively broken and replaced with independent ambient-sourced loops: ** Heat pump acts as a cooling unit for the freezer, expelling heat outside. ** Heat pump acts as a heating unit for the sauna, drawing heat from outside. 🧠 System Behavior Summary Phase Heat Source Heat Sink Efficiency (COP) Trigger 1 Freezer Sauna High Default start 2 Freezer Sauna (↑temp) Dropping Sauna ≥ ~40 °C 3 Ambient air Sauna Higher (again) Valve triggered Freezer Ambient air Higher (again) Valve triggered 🔧 Implementation Requires: Temperature sensors in all 3 zones (freezer, sauna, ambient). Thermostats with logic to trigger a solenoid or motorized valve. A 4-way reversing valve (if refrigerant-based). Air dampers (if air-duct based). Optional: microcontroller (like ESP32/Raspberry Pi) or smart HVAC controller. Use 2 systems if: You want consistent, reliable extreme temperatures. You prioritize energy efficiency and longevity. Use 1 system with smart ambient crossover if: Budget is limited. You accept some performance trade-offs and complexity in exchange for lower hardware cost.
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