/* Copyright 2000 Charles G. Wright
 * This software may be distributed under the terms of the
 * GNU General Public License.
 *
 * $Id: hvac.java,v 1.1 2000-06-15 10:14:58-05 chuckles Exp chuckles $
 */

/** Describes the characteristics of a HVAC system, and provides
 * related mtehods. */
public class hvac{

  private double tc;
  private double th;
  private Utility heating_util;
  private Utility cooling_util;

  private double heating_cop;
  private double cooling_cop;

  /** <p>Creates an instance of the hvac class, given
   * <ul><li> the COP of the heating system,
   * <li> the COP of the cooling system,
   * <li> the heating set temperature, 
   * <li> the cooling set temperature,
   * <li> a Utility object representing the source of heating energy,
   * <li> a Utility object representing the source of cooling energy.
   * </ul>
   */

   public hvac(double hcop, 
	       double ccop, 
	       double th, 
	       double tc, 
	       Utility heating_util,
	       Utility cooling_util){
     this.heating_cop = hcop;
     this.cooling_cop = ccop;
     this.tc = tc;
     this.th = th;
     this.heating_util = heating_util;
     this.cooling_util = cooling_util;
  }

  //---- public methods ------------------------------------

  /** Returns the current Coefficient of Performance for heating. */
  public double getHeatingCOP(){
    return(heating_cop);
  }
  /** Sets the current Coefficient of Performance for Heating. */
  public void setHeatingCOP(double cop){
    heating_cop = cop;
  }

  /** Returns the current Coefficient of Performance for
   * cooling. */
  public double getCoolingCOP(){
    return(cooling_cop);
  }
  /** Sets the current Coefficient of Performance for cooling. */
  public void setCoolingCOP(double cop){
    cooling_cop = cop;
  }

  /** Gets the current thermostat setting (in C) for heating. */
  public double getHeatingTemp(){
    return(th);
  }
  
  /** Sets the current thermostat for heating. Classes that use
   * the hvac class should consult this setting when calculating
   * hvac energy requirements. */
  public void setHeatingTemp(int th){
    this.th = th;
  }

  /** Gets the current thermostat setting (in C) for cooling. */
  public double getCoolingTemp(){
    return(tc);
  }
  /** Sets the current thermostat for cooling. Classes that use
   * the hvac class should consult this setting when calculating
   * cooling energy requirements. */
  public void setCoolingTemp(int tc){
    this.tc = tc;
  }


  /** Returns the current heating Utility object. */
  public Utility getHeatingUtil(){
    return(heating_util);
  }

  /** Returns the current cooling Utility object. */
  public Utility getCoolingUtil(){
    return(cooling_util);
  }

  /** Sets the current heating Utility object. */
  public void setHeatingUtil(Utility util){
    this.heating_util = util;
  }

  /** Sets the current cooling Utility object. */
  public void setCoolingUtil(Utility util){
    this.heating_util = util;
  }
 
  /** Returns the cost (in dollars) of energy used in
   * heating, based on costs in the current Utility object and
   * the current type of heat, given the heating requirement,
   * in kilowatt hours. */

  public double getHeatingCost(double kwh){
    return(heating_util.getCost(kwh / heating_cop));
  }

  /** Returns the cost (in dollars) of energy used in
   * cooling, based on costs in the current Utility object and
   * the current type of heat, given the heating requirement,
   * in kilowatt hours. */

  public double getCoolingCost(double kwh){
    return(cooling_util.getCost(kwh / cooling_cop));
  }
}