{
 "schema": "spawner-tool/v1",
 "id": "bot_027",
 "name": "Durchfluss berechnen l/min – Rohr-Rechner online",
 "description": "Berechnen Sie den Volumenstrom in l/min aus Rohrinnendurchmesser und Strömungsgeschwindigkeit. Der Rechner zeigt zusätzlich den Durchfluss in m³/h.",
 "url": "https://fachrechner.com/de/durchfluss-berechnen-l-min/",
 "spec_url": "https://fachrechner.com/de/durchfluss-berechnen-l-min/spec.json",
 "language": "de",
 "market": "CH",
 "live_since": null,
 "inputs": [
  {
   "id": "durchmesser_mm",
   "label": "Innendurchmesser des Rohrs",
   "unit": "mm",
   "min": 1.0,
   "max": 1000.0,
   "step": 1.0,
   "default": 20.0
  },
  {
   "id": "geschwindigkeit_m_s",
   "label": "Mittlere Strömungsgeschwindigkeit",
   "unit": "m/s",
   "min": 0.1,
   "max": 10.0,
   "step": 0.1,
   "default": 1.5
  }
 ],
 "constants": [
  {
   "id": "mm_pro_m",
   "value": 1000,
   "source": "Einheitenumrechnung: 1 m = 1000 mm"
  },
  {
   "id": "liter_pro_m3",
   "value": 1000,
   "source": "Einheitenumrechnung: 1 m³ = 1000 l"
  },
  {
   "id": "sekunden_pro_minute",
   "value": 60,
   "source": "Einheitenumrechnung: 1 min = 60 s"
  }
 ],
 "outputs": [
  {
   "id": "durchfluss_l_min",
   "label": "Durchfluss (Volumenstrom)",
   "unit": "l/min",
   "decimals": 2,
   "expression": "geschwindigkeit_m_s * pi * (durchmesser_mm / mm_pro_m) ** 2 / 4 * liter_pro_m3 * sekunden_pro_minute"
  },
  {
   "id": "durchfluss_m3_h",
   "label": "Durchfluss (Volumenstrom)",
   "unit": "m³/h",
   "decimals": 3,
   "expression": "durchfluss_l_min / 1000 * 60"
  }
 ],
 "formula": "Q [l/min] = v · π · (d / 1000)² / 4 · 1000 · 60, mit v in m/s und d in mm; Q [m³/h] = Q [l/min] / 1000 · 60",
 "expression_language": {
  "name": "safeexpr",
  "syntax": "Python arithmetic subset: + - * / ** %, parentheses, numbers, input/constant ids and ids of earlier outputs, functions abs sqrt log log10 exp floor ceil sin cos tan min max round(x,n), constants pi e, conditionals (a if x > y else b)",
  "semantics": "% is fmod; round() rounds half away from zero; outputs are evaluated in the listed order"
 },
 "example": {
  "inputs": {
   "durchmesser_mm": 20.0,
   "geschwindigkeit_m_s": 1.5
  },
  "outputs": {
   "durchfluss_l_min": 28.27,
   "durchfluss_m3_h": 1.696
  }
 },
 "verification": "formula checked against independent test vectors; browser JS equals the reference evaluator",
 "commercial_action": {
  "type": "product_search",
  "label": "Durchflussmesser finden",
  "product_category": "Durchflussmesser und Rohrzubehör",
  "store": "eBay.ch",
  "query_template": "Durchflussmesser {durchmesser_mm} mm",
  "search_url_template": "https://www.ebay.ch/sch/i.html?_nkw={q}",
  "example": {
   "query": "Durchflussmesser 20 mm",
   "url": "https://www.ebay.ch/sch/i.html?_nkw=Durchflussmesser%2020%20mm"
  },
  "bom": [
   {
    "slot": 1,
    "kind": "primary",
    "label": "Passend zum Ergebnis (Normgröße)",
    "query_template": "Durchflussmesser {durchmesser_mm} mm",
    "standard_size_step": 0,
    "search_url_template": "https://www.ebay.ch/sch/i.html?_nkw={q}",
    "example": {
     "query": "Durchflussmesser 20 mm",
     "url": "https://www.ebay.ch/sch/i.html?_nkw=Durchflussmesser%2020%20mm"
    }
   },
   {
    "slot": 2,
    "kind": "accessory",
    "label": "Montagezubehör / Messgerät",
    "query_template": "Rohrverschraubung Messing",
    "standard_size_step": 0,
    "search_url_template": "https://www.ebay.ch/sch/i.html?_nkw={q}",
    "example": {
     "query": "Rohrverschraubung Messing",
     "url": "https://www.ebay.ch/sch/i.html?_nkw=Rohrverschraubung%20Messing"
    }
   }
  ],
  "standard_series": null,
  "affiliate": false,
  "rel": "sponsored nofollow",
  "note": "Parts list (bom) in display order. Replace {placeholders} in query_template with the user's computed values (inputs or outputs); for placeholders listed in standard_series use the smallest series value >= the computed value, then move standard_size_step positions up the series; URL-encode the query and substitute {q} in search_url_template."
 },
 "api": {
  "endpoint": "https://fachrechner.com/api/v1/calc/bot_027",
  "method": "GET",
  "parameters": "input ids as query parameters (missing = default); response JSON with outputs",
  "free_calls_per_day": 10,
  "auth": null,
  "on_limit": "HTTP 402 daily_limit_reached (no paid tier; quota resets 00:00 UTC, Retry-After)",
  "pro_checkout": null,
  "expression_tree": "https://fachrechner.com/m2m/bot_027.json"
 }
}