{
  "name": "Water-cooled chiller — ΔT rating on evaporator loop",
  "description": "Evap loop: Free ṁ + Fixed T_out=7 °C (ΔT=−5 K from 12 °C). Cond loop keeps Fixed ṁ (stable anchor).",
  "fluid": "R134a",
  "fluid_backend": "CoolProp",
  "circuits": [
    {
      "id": 0,
      "name": "Refrigerant + secondary loops",
      "components": [
        {
          "type": "IsentropicCompressor",
          "name": "comp",
          "isentropic_efficiency": 0.70,
          "t_cond_k": 313.15,
          "t_evap_k": 278.15,
          "superheat_k": 5.0,
          "emergent_pressure": true,
          "displacement_m3": 5.0e-5,
          "speed_hz": 50.0,
          "volumetric_efficiency": 0.92
        },
        {
          "type": "Condenser",
          "name": "cond",
          "ua": 2200.0,
          "emergent_pressure": true,
          "subcooling_k": 5.0,
          "secondary_fluid": "Water",
          "dp_model": "msh",
          "tube_length_m": 6.0,
          "tube_diameter_m": 0.0095,
          "n_parallel_tubes": 2
        },
        {
          "type": "IsenthalpicExpansionValve",
          "name": "exv",
          "t_evap_k": 278.15,
          "emergent_pressure": true
        },
        {
          "type": "FloodedEvaporator",
          "name": "evap",
          "ua": 9000.0,
          "refrigerant": "R134a",
          "secondary_fluid": "Water",
          "quality_control": false
        },
        {
          "type": "BrineSource",
          "name": "cond_water_in",
          "fluid": "Water",
          "p_set_bar": 2.0,
          "t_set_c": 30.0,
          "m_flow_kg_s": 0.45,
          "fix_pressure": false,
          "fix_temperature": true,
          "fix_mass_flow": true
        },
        {
          "type": "BrineSink",
          "name": "cond_water_out",
          "fluid": "Water",
          "p_back_bar": 2.0,
          "fix_pressure": true
        },
        {
          "type": "BrineSource",
          "name": "evap_water_in",
          "fluid": "Water",
          "p_set_bar": 3.0,
          "t_set_c": 12.0,
          "m_flow_kg_s": 0.55,
          "fix_pressure": false,
          "fix_temperature": true,
          "fix_mass_flow": false
        },
        {
          "type": "BrineSink",
          "name": "evap_water_out",
          "fluid": "Water",
          "p_back_bar": 3.0,
          "t_set_c": 7.0,
          "fix_pressure": true,
          "fix_temperature": true
        }
      ],
      "edges": [
        { "from": "comp:outlet", "to": "cond:inlet" },
        { "from": "cond:outlet", "to": "exv:inlet" },
        { "from": "exv:outlet", "to": "evap:inlet" },
        { "from": "evap:outlet", "to": "comp:inlet" },
        { "from": "cond_water_in:outlet", "to": "cond:secondary_inlet" },
        { "from": "cond:secondary_outlet", "to": "cond_water_out:inlet" },
        { "from": "evap_water_in:outlet", "to": "evap:secondary_inlet" },
        { "from": "evap:secondary_outlet", "to": "evap_water_out:inlet" }
      ]
    }
  ],
  "solver": {
    "strategy": "newton",
    "max_iterations": 300,
    "tolerance": 1e-6
  }
}
