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GET /v1/lmtd

Log mean temperature difference

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10 free calls per day — no sign-up, no API key. Goes through the oanor gateway.

Custom headers (optional)
api.oanor.com/lmtd-api

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Code snippets

curl "https://api.oanor.com/lmtd-api/v1/lmtd" \
  -H "x-oanor-key: oanor_test_..."
await fetch("https://api.oanor.com/lmtd-api/v1/lmtd", {
  headers: { "x-oanor-key": "oanor_test_..." }
});
$ch = curl_init("https://api.oanor.com/lmtd-api/v1/lmtd");
curl_setopt($ch, CURLOPT_HTTPHEADER, ["x-oanor-key: oanor_test_..."]);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
$out = curl_exec($ch);
import requests
requests.get(
    "https://api.oanor.com/lmtd-api/v1/lmtd",
    headers={"x-oanor-key": "oanor_test_..."}
)

Example response

A real response from this endpoint, captured by the latest health check.

{
    "data": {
        "lmtd": 69.52119,
        "formula": "LMTD = (ΔT1 − ΔT2)/ln(ΔT1/ΔT2).",
        "delta_t1": 80,
        "delta_t2": 60,
        "hot_inlet": 150,
        "cold_inlet": 30,
        "hot_outlet": 90,
        "arrangement": "counterflow",
        "cold_outlet": 70
    },
    "meta": {
        "timestamp": "2026-06-04T10:18:49.343Z",
        "request_id": "75186ad4-5068-412c-a6d6-ec068a6a877f"
    },
    "status": "ok",
    "message": "Log mean temperature difference",
    "success": true
}