Temperature control system for zoned space
First Claim
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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Accused Products
Abstract
A variable air volume control system has a temperature system management device which calculates an air flow setpoint in a temperature zone as a function of a proportional term that accommodates gross temperature-setpoint errors, and integral term that provides heating or cooling load matching, and a derivative term that accommodates rapid fluctuations in the cooling or heating load, and communicates the flow setpoint to a terminal control unit to adjust the air flow to a space. The terminal control unit will implement a flow setpoint as a function of the gross error in temperature in the space and a default temperature comfort setpoint upon failure of the temperature system management device to maintain a temperature in the zone.
117 Citations
3 Claims
-
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, and a 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.; andGt =Temperature loop Gain Multiplier, having a range from 0.1-10. - View Dependent Claims (2, 3)
-
Specification