epb/lib/index.js

Energy performance of buildings

(function (global, factory) {
  typeof exports === 'object' && typeof module !== 'undefined' ? factory(exports) :
  typeof define === 'function' && define.amd ? define(['exports'], factory) :
  (global = global || self, factory(global.epb = {}));
}(this, (function (exports) { 'use strict';

  /**
   * @type {string} A performance regulator.
   */
  const regulators = ['brussels', 'flanders', 'france', 'wallonia'];

  /**
   * Get the energy class of a building (like `A++`, `A+`, `A`, `B`...) following the regulator rules, given its energy consumption.
   * If the energy class cannot be calculated, `null` is returned.
   *
   * @param {regulator} regulator The regulator that defines class calculation rules.
   * @param {number} consumption The consumption of the building in kWh/m².year.
   * @returns {(string|null)} The energy class.
   */
  const energyClass = (regulator, consumption) => {
    switch (regulator) {
      case 'brussels':
        if (consumption <= 0) return 'A++'
        if (consumption <= 15) return 'A+'
        if (consumption <= 30) return 'A'
        if (consumption <= 45) return 'A-'
        if (consumption <= 62) return 'B+'
        if (consumption <= 78) return 'B'
        if (consumption <= 95) return 'B-'
        if (consumption <= 113) return 'C+'
        if (consumption <= 132) return 'C'
        if (consumption <= 150) return 'C-'
        if (consumption <= 170) return 'D+'
        if (consumption <= 190) return 'D'
        if (consumption <= 210) return 'D-'
        if (consumption <= 232) return 'E+'
        if (consumption <= 253) return 'E'
        if (consumption <= 275) return 'E-'
        if (consumption <= 345) return 'F'
        return 'G'

      case 'france':
        if (consumption <= 50) return 'A'
        if (consumption <= 90) return 'B'
        if (consumption <= 150) return 'C'
        if (consumption <= 230) return 'D'
        if (consumption <= 330) return 'E'
        if (consumption <= 450) return 'F'
        return 'G'

      case 'wallonia':
        if (consumption <= 0) return 'A++'
        if (consumption <= 45) return 'A+'
        if (consumption <= 85) return 'A'
        if (consumption <= 170) return 'B'
        if (consumption <= 255) return 'C'
        if (consumption <= 340) return 'D'
        if (consumption <= 425) return 'E'
        if (consumption <= 510) return 'F'
        return 'G'

      default:
        return null
    }
  };

  /**
   * Get the total consumption of a building in a year, given its energy consumption and its total area.
   *
   * @param {number} consumption The consumption of the building in kWh/m².year.
   * @param {number} area The total area of the building in m².
   * @returns {number} The total consumption in kWh/year.
   */
  const totalConsumption = (consumption, area) => consumption * area;

  exports.energyClass = energyClass;
  exports.regulators = regulators;
  exports.totalConsumption = totalConsumption;

  Object.defineProperty(exports, '__esModule', { value: true });

})));