In-Transit Temperature — Night Haul
Mix temperature on arrival for night haul (Newton cooling) vs the compaction minimum.
Night air is colder AND clearer — radiant loss to a black sky adds to convection in a way daytime hauling never shows. Night-shift dispatchers pad discharge temperature by ~5 °C over the daytime habit for the same route.
Formula
Note: Paving estimates only — the project mix design, agency specification and the plant's QC data govern. Temperature models are simplified; verify with an infrared gun and density gauge on the mat.
Mix temperature on arrival for night haul (Newton cooling) vs the compaction minimum. A free asphalt paving temperature & logistics tool — no sign-up, no upload, instant results in your browser.
About In-Transit Temperature — Night Haul
In-Transit Temperature — Night Haul computes the governing relationship T(t) = T_a + (T₀ − T_a)e^(−kt) live as you type. Night air is colder AND clearer — radiant loss to a black sky adds to convection in a way daytime hauling never shows. Night-shift dispatchers pad discharge temperature by ~5 °C over the daytime habit for the same route. Defaults are pre-filled with realistic values for this exact scenario, and the worked example substitutes your numbers step by step so the math is never a black box.
How to use In-Transit Temperature — Night Haul
- 1Enter your values — Discharge temp at plant, Ambient temperature, Cooling coefficient, Load-to-discharge time and more (sensible defaults are pre-filled).
- 2Read the live results: Arrival temperature, Heat lost.
- 3Check the "with your numbers" line to see T(t) = T_a + (T₀ − T_a)e^(−kt) substituted step by step.
- 4Adjust inputs until the scenario matches yours, then copy or share the result.
Why use In-Transit Temperature — Night Haul?
- ✓Instant, free and private — every calculation runs client-side in your browser; nothing is uploaded
- ✓Built on the stated formula T(t) = T_a + (T₀ − T_a)e^(−kt) with authoritative sources cited on the page (NAPA — HMA paving handbook & best practices; MultiCool / Minnesota DOT mat-cooling research (Chadbourn et al.))
- ✓Night air is colder AND clearer — radiant loss to a black sky adds to convection in a way daytime hauling never shows.
- ✓SI ⇄ Imperial toggle converts your inputs in place, so you can work in the units your drawings use
Frequently asked questions
What formula does the in-transit temperature — night haul use?+
It evaluates T(t) = T_a + (T₀ − T_a)e^(−kt), exactly as published. Sources: NAPA — HMA paving handbook & best practices; MultiCool / Minnesota DOT mat-cooling research (Chadbourn et al.). The substituted worked example on the page lets you verify every step against the textbook.
How should I read the result — and how far can I trust it?+
Night air is colder AND clearer — radiant loss to a black sky adds to convection in a way daytime hauling never shows. Paving estimates only — the project mix design, agency specification and the plant's QC data govern. Temperature models are simplified; verify with an infrared gun and density gauge on the mat.
When is this calculator the right tool for the job?+
Mix temperature on arrival for night haul (Newton cooling) vs the compaction minimum. A free asphalt paving temperature & logistics tool. Night-shift dispatchers pad discharge temperature by ~5 °C over the daytime habit for the same route. For neighbouring scenarios, the related tools below cover the same engine with different presets.
Does it support both metric and imperial units?+
Yes — the SI ⇄ Imperial toggle converts the values already in the fields, preserving the physical quantity, so you can flip mid-calculation without re-entering anything.
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