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Quick Heat Load Estimator | Sinclair

Quick Heat Load Estimator

Estimate the cooling load for a single room from its dimensions, windows, occupancy and lighting — the same method as Metraclark's internal spreadsheet tool.

NB: Consult Metraclark Engineering should your selection deviate from the assumptions specified below.

Room, outdoor conditions & internal loads

23–28°C is extrapolated beyond the source spreadsheet's own data (32°C+) — indicative only.
Add 10% safety factor to the total
Matches the spreadsheet's "ADD SF" toggle — applied on top of the 5% margin already built into windows, walls, roof and people.

Windows & walls — laid out by orientation, same as the source spreadsheet. Length + height per elevation, capped to the room's own dimensions.

North0.00 m²
West0.00 m²
N S W E
5.0 × 5.0 m
25.0 m²
room area
East0.00 m²
South0.00 m²

Result

Windows
0 W
Walls
0 W
Roof
0 W
People
0 W
Lights
0 W
0.00 kW
0 W total cooling load
0 W/m²
load intensity

Assumptions & notes

Assumptions/Notes
Indoor design temp
20 [°C]
Room height
3 [m]
Standard tiled roof
Single pane glass windows (U = 5.83)
Fresh air of 7.5 L/s per person
Use at your own risk: this is an indicative quick estimate only, not a substitute for a full heat load survey. Metraclark accepts no liability for decisions or installations based on this output — verify with Metraclark Engineering before quoting or installing.
Room-area load intensity (W/m²) and component breakdown follow the same linear fits, per-orientation wall/window coefficients and safety-factor logic as Metraclark's internal "Quick Heat Load Estimator" spreadsheet. North and south windows are capped to the room length (X); east and west windows to the room width (Y); all window heights are capped to the room height. This estimate covers a single, simply-shaped room with up to four external elevations — for irregular rooms, multiple zones, high internal heat gains, or anything outside the assumptions above, consult Metraclark Engineering directly.

Correction applied: the source spreadsheet's single-pane window formulas at 38/41/43°C outdoor design temp were roughly 8× too steep versus its own reference table (a formula error, not a real solar effect) — refit here from that same table. Double-pane (U=3.00) coefficients were refit the same way rather than scaled from single-pane, since the U-value ratio alone isn't constant across orientations or design temperatures in the source data.