CURVES

Description

When using a detailed variable speed compressor model, it is necessary to specify the variable speed COMPRESSOR CHART. This can be defined from a .csv file, or it can be defined directly in the YAML file. In either case, the keyword CURVES needs to be used, and curves for at least two different speeds must be defined. If a .csv file is being used, under the CURVES keyword, FILE must be used. If specified directly in the YAML file, SPEED, RATE, HEAD and EFFICIENCY must be defined for each speed.

Format

MODELS:
  - NAME: <name of chart, for reference>
    TYPE: COMPRESSOR_CHART
    CHART_TYPE: VARIABLE_SPEED
    ...
    CURVES:
      - SPEED: <shaft speed for this curve, a number>
        RATE: <list of rate values for this chart curve>
        HEAD: <list of polytropic head values for this chart curve>
        EFFICIENCY: <list of polytropic efficiency values for this chart curve>
      - SPEED: <shaft speed for this curve, a number>
        RATE: <list of rate values for this chart curve>
        HEAD: <list of polytropic head values for this chart curve>
        EFFICIENCY: <list of polytropic efficiency values for this chart curve>

  - NAME: <name of chart, for reference>
    TYPE: COMPRESSOR_CHART
    CHART_TYPE: VARIABLE_SPEED
    ... 
    CURVES:
       - FILE: <filepath to compressor curve>

Example

MODELS:
  - NAME: predefined_variable_speed_compressor_chart
    TYPE: COMPRESSOR_CHART
    CHART_TYPE: VARIABLE_SPEED
    ...
    CURVES:
      - SPEED: 7500
        RATE: [2900, 3503, 4002, 4595.0]
        HEAD: [8412.9, 7996, 7363, 6127]
        EFFICIENCY: [0.72, 0.75, 0.74, 0.70]
      - SPEED: 9886
        RATE: [3708, 4502, 4993.6, 5507, 5924]
        HEAD: [13845, 13182, 12425, 11276, 10054]
        EFFICIENCY: [ 0.72, 0.75, 0.748, 0.73, 0.70]

  - NAME: compressor_chart
    TYPE: COMPRESSOR_CHART
    CHART_TYPE: VARIABLE_SPEED
    ... 
    CURVES:
       - FILE: compressor_chart.csv