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This commit is contained in:
fraxle
2026-07-26 16:52:41 +01:00
parent dbadb1d410
commit 709e51e1fa
2 changed files with 35 additions and 24 deletions
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assets/js/physics.js
+23 -18
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@@ -377,15 +377,12 @@ export function calcManagedIndoorTempPass(TaArr, globArr, elevArr, buildingType
// Panel surface temp - conductive gain into cabin air.
//
// 2. VERTICAL GLAZING GAIN (sun-angle dependent)
// When solar elevation is between ~10- and ~60-, the sun's rays
// cut through the side glass and windscreen at an angle that allows
// significant transmission into the cabin. This warms the cabin air
// but the occupant is modelled as NOT sitting in the beam -
// so it adds to ambient cabin temp, not direct radiant load.
// Outside that window a diffuse floor still applies: scattered sky
// light enters the glass at any sun angle, so the tent function is
// clamped rather than switched off (an unclamped tent produced a
// discontinuity where a LOWER sun gave MORE glazing gain).
// Sun cuts through the side glass and windscreen and warms the cabin
// air, but the occupant is modelled as NOT sitting in the beam - so it
// adds to ambient cabin temp, not direct radiant load. The beam on
// vertical glass goes as cos(elevation) averaged over azimuth, over a
// diffuse floor that applies at any sun angle. A parked vehicle is not
// aimed at the sun, so only orientFactor of the glazing is catching it.
//
// 3. HORIZONTAL GLAZING GAIN (rooflights / panoramic roofs)
// Rooflights collect most strongly when the sun is high - the exact
@@ -442,16 +439,24 @@ export function calcVehicleInteriorTemp(Ta, globalRad, solElev, vehicleType = 'c
// -- 2. Vertical glazing gain (angle-dependent) --------------------
// Glazing transmission for auto glass ~0.70; scaled by vehicle glazing area.
// Tent function peaks at 35- elevation, where the sun cuts squarely through
// side glass and windscreen, and tapers either side. It is clamped at 0.30
// (= the 0.15 diffuse floor once the 0.5 not-in-beam factor is applied) so
// scattered sky light always gets in. Without that clamp the gain fell to
// zero at 10- and 60- and then jumped back up outside the range.
//
// The beam landing on VERTICAL glass goes as cos(elevation) once averaged
// over azimuth, plus a diffuse floor of scattered sky light that gets in at
// any sun angle. orientFactor then accounts for the glazing that is NOT
// pointing at the sun - a parked vehicle is not aimed, and a motorhome's
// windscreen faces wherever it happened to park.
//
// This replaced a tent function that peaked at 35- elevation. That shape
// assumed the glass was always squarely aimed at the sun, so its factor
// nearly TRIPLED between 3pm and 5pm as the sun dropped toward the peak -
// sending a ventilated van climbing to +9 over ambient in the late
// afternoon when the measured excess stays flat around +5..6. It also had
// a discontinuity at its 10-/60- cut-offs where a LOWER sun gave MORE gain.
const tau = 0.70 * preset.glazingArea;
const tent = (solElev != null && solElev > 0)
? Math.max(0, 1 - Math.abs(solElev - 35) / 25)
: 0;
const glazingGain = tau * globalRad * Math.max(0.30, tent) * 0.5; // occupant not in beam
const angleFactor = (solElev != null && solElev > 0)
? 0.30 + 0.70 * Math.cos(solElev * Math.PI / 180)
: 0.30;
const glazingGain = tau * globalRad * angleFactor * (preset.orientFactor ?? 0.65) * 0.5;
// -- 3. Horizontal glazing gain (rooflights, panoramic roof) -------
// Rooflights collect in proportion to sin(elevation), so they peak at midday
assets/js/utils.js
+12 -6
View File
@@ -215,6 +215,12 @@ export function burnLabel(mins) {
// roofGlazing - relative HORIZONTAL glass area (rooflights / Heki hatches /
// panoramic glass roof). Gains from these peak at high sun,
// which is exactly when the vertical-glass term is tailing off.
// orientFactor - fraction of the vertical glazing actually facing the sun,
// same idea as BUILDING_TYPES.orientFactor. A parked vehicle
// is NOT aimed at the sun: a car has glass on all four sides
// so a decent share always catches it (0.65), whereas a
// motorhome's glazing is dominated by one big windscreen
// pointing wherever it happened to park (0.50).
// bodyU - effective body/panel conductance into the cabin. Cars are
// thin metal/glass boxes; motorhomes/caravans have insulated
// sandwich panels, commonly around 25-35 mm thick.
@@ -234,12 +240,12 @@ export function burnLabel(mins) {
// internalGain - small living-space warmth boost when closed up.
// -------------------------------------------------------------------
export const VEHICLE_TYPES = {
car: { name: 'Car / Hatchback', albedo: 0.25, glazingArea: 1.00, roofGlazing: 0.00, bodyU: 4.0, hCabinLoss: 11.0, ventMult: 4.0, lagHours: 0.5, retainedWarmth: false, internalGain: 0.0 },
mpv: { name: 'MPV / People Carrier', albedo: 0.25, glazingArea: 1.30, roofGlazing: 0.02, bodyU: 4.0, hCabinLoss: 11.5, ventMult: 4.0, lagHours: 0.6, retainedWarmth: false, internalGain: 0.0 },
suv: { name: 'SUV / 4x4', albedo: 0.22, glazingArea: 1.10, roofGlazing: 0.02, bodyU: 3.8, hCabinLoss: 11.0, ventMult: 4.0, lagHours: 0.6, retainedWarmth: false, internalGain: 0.0 },
truck: { name: 'Truck / HGV Cab', albedo: 0.30, glazingArea: 1.20, roofGlazing: 0.00, bodyU: 3.5, hCabinLoss: 10.5, ventMult: 4.0, lagHours: 0.7, retainedWarmth: false, internalGain: 0.0 },
motorhome: { name: 'Motorhome / Campervan', albedo: 0.55, glazingArea: 0.85, roofGlazing: 0.06, bodyU: 0.9, hCabinLoss: 6.5, ventMult: 2.5, lagHours: 1.5, retainedWarmth: true, internalGain: 1.2 },
caravan: { name: 'Caravan (towed)', albedo: 0.60, glazingArea: 0.55, roofGlazing: 0.07, bodyU: 0.8, hCabinLoss: 6.2, ventMult: 2.4, lagHours: 1.7, retainedWarmth: true, internalGain: 1.2 },
car: { name: 'Car / Hatchback', albedo: 0.25, glazingArea: 1.00, roofGlazing: 0.00, orientFactor: 0.65, bodyU: 4.0, hCabinLoss: 11.5, ventMult: 4.0, lagHours: 0.5, retainedWarmth: false, internalGain: 0.0 },
mpv: { name: 'MPV / People Carrier', albedo: 0.25, glazingArea: 1.30, roofGlazing: 0.02, orientFactor: 0.65, bodyU: 4.0, hCabinLoss: 13.0, ventMult: 4.0, lagHours: 0.6, retainedWarmth: false, internalGain: 0.0 },
suv: { name: 'SUV / 4x4', albedo: 0.22, glazingArea: 1.10, roofGlazing: 0.02, orientFactor: 0.65, bodyU: 3.8, hCabinLoss: 12.0, ventMult: 4.0, lagHours: 0.6, retainedWarmth: false, internalGain: 0.0 },
truck: { name: 'Truck / HGV Cab', albedo: 0.30, glazingArea: 1.20, roofGlazing: 0.00, orientFactor: 0.60, bodyU: 3.5, hCabinLoss: 11.0, ventMult: 4.0, lagHours: 0.7, retainedWarmth: false, internalGain: 0.0 },
motorhome: { name: 'Motorhome / Campervan', albedo: 0.55, glazingArea: 0.85, roofGlazing: 0.06, orientFactor: 0.50, bodyU: 0.9, hCabinLoss: 7.0, ventMult: 2.5, lagHours: 1.5, retainedWarmth: true, internalGain: 1.2 },
caravan: { name: 'Caravan (towed)', albedo: 0.60, glazingArea: 0.55, roofGlazing: 0.07, orientFactor: 0.55, bodyU: 0.8, hCabinLoss: 6.5, ventMult: 2.4, lagHours: 1.7, retainedWarmth: true, internalGain: 1.2 },
};
// -------------------------------------------------------------------