Steady conduction heat flow through a slab or cylinder wall of layers in series,...

{ "method": "GET", "queryParams": { "areaM2": 1, "coldC": -10, "geometry": "slab", "hotC": 20, "layers": "0.2:0.72;0.05:0.04" }, "type": "http" }

{ "example": { "areaM2": 1, "asOf": "2026-10-21T06:33:56.360Z", "degraded": false, "disclaimer": "Screening signal computed from the named public source. Not financial, legal or investment advice; provided as is. Verify at the source before acting.", "geometry": "slab", "heatFlowPerMeterWPerM": null, "heatFlowW": 19.636364, "heatFluxWPerM2": 19.636364, "notChecked": [ "contact resistance between layers", "thermal bridges, edge effects and moisture in insulation", "…2 more" ], "rValueUs": 8.675124, "reasons": [ "Slab: R = thickness / (k A) per layer; resistances add in series; Q = deltaT / total R.", "Temperatures step down across each element in proportion to its resistance (listed below).", "…1 more" ], "rsiM2KPerW": 1.5277778, "source": "computed locally (Fourier: slab R = L/(kA); cylinder R = ln(r2/r1)/(2 pi k L); layers add in series; Q = deltaT / sum R)", "stack": [ { "coldSideC": 14.545455, "element": "layer 1", "hotSideC": 20, "resistanceKPerW": 0.27777778 }, { "coldSideC": -10, "element": "layer 2", "hotSideC": 14.545455, "resistanceKPerW": 1.25 } ], "summary": "slab wall of 2 layers: heat flow 19.636 W for 30 K, total resistance 1.5278 K/W.", "temperatureDifferenceK": 30, "totalResistanceKPerW": 1.5277778, "uOverallWPerM2K": 0.65454545, "verdict": "COMPUTED" }, "type": "json" }