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Temperature control system for zoned space

  • US 5,180,102 A
  • Filed: 08/12/1991
  • Issued: 01/19/1993
  • Est. Priority Date: 08/12/1991
  • Status: Expired due to Term
First Claim
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1. A temperature control system for controlling the flow of air into a plurality of temperature zones of a building, each temperature zone having at least one air terminal to adjustably maintain a variable volume of air into the associated temperature zone, comprising:

  • a system management means generating a desired air flow setpoint schedule for the plurality of temperature zones, anda terminal control means for each temperature zone for receiving the generating desired air flow setpoint for varying the air through an associated air terminal to the desired air flow setpoint;

    wherein said desired air flow setpoint is calculated using the following formula;

    
    
    space="preserve" listing-type="equation">Flow Setpoint=G.sub.t ×

    (K.sub.p ×

    P+K.sub.i ×

    I+K.sub.d ×

    D)where;

    P=Temperature Setpoint-Zone Space Temperature, (for heating), or Zone Space Temeprature-Temperature Setpoint, (for cooling);

    ##EQU2## where R is the periodic running rate of this process; and

    I is sum of all I terms from Io to InnKi =0.06, in 1/°

    F. seconds;

    If I >

    100 (Ki ×

    Gt), then I=100/(Ki ×

    Gt), andIf I <

    0, then I=O;

    D=(P-Previous P)/R, where R is the periodic running rate of this process;

    Kd =1, in seconds/°

    F.; and

    Gt =Temperature loop Gain Multiplier, having a range from 0.1-10.

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