Effectiveness-NTU method

Code snippets

curl "https://api.oanor.com/lmtd-api/v1/effectiveness" \
  -H "x-oanor-key: oanor_test_..."

await fetch("https://api.oanor.com/lmtd-api/v1/effectiveness", {
  headers: { "x-oanor-key": "oanor_test_..." }
});

$ch = curl_init("https://api.oanor.com/lmtd-api/v1/effectiveness");
curl_setopt($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/effectiveness",
    headers={"x-oanor-key": "oanor_test_..."}
)

Example response

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

{
    "data": {
        "ntu": 2.5,
        "c_hot": 2000,
        "c_max": 3000,
        "c_min": 2000,
        "c_cold": 3000,
        "formula": "ε = (1−e^(−NTU(1−Cr)))/(1−Cr·e^(−NTU(1−Cr))); ε = NTU/(1+NTU) when Cr=1.",
        "q_max_w": 240000,
        "hot_inlet": 150,
        "cold_inlet": 30,
        "hot_outlet": 54.475172,
        "arrangement": "counterflow",
        "cold_outlet": 93.683218,
        "heat_duty_w": 191049.6552,
        "heat_duty_kw": 191.049655,
        "effectiveness": 0.79604023,
        "capacity_ratio": 0.666667
    },
    "meta": {
        "timestamp": "2026-06-04T10:18:49.239Z",
        "request_id": "65ce47f2-7172-43db-a1bc-5b3d2a9c8052"
    },
    "status": "ok",
    "message": "Effectiveness-NTU",
    "success": true
}