Duct pressure synthesis for air distribution system
First Claim
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1. An apparatus for determining the static pressure in a plenum of an adjustable air terminal of an air distribution system having at least one adjustable air terminal in the plenum for varying the volume of air into a space, comprising:
- means for sensing the temperature of space;
means for setting the set point of the desired temperature of the space;
means for adjusting the air flow through the terminal into the space to adesired air flow Fd responsive to the difference between the sensed temperature in the space and set point for the space whereby said means for adjusting the air flow is dependent upon the static pressure in the plenum for the adjustment;
means for measuring the initial air flow Fi through the terminal at an initial time ti and for measuring the time for the air flow through the terminal to reach the desired flow td ; and
means for converting the measured difference between the desired air flow Fd and the initial air flow Fi, and the initial time ti and the time to reach the desired flow td to the static pressure P in the plenum of the air terminal.
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Abstract
An air terminal flow detection scheme in an air distribution system effective for developing static pressure indications of the plenum of the air terminal from change in the flow through the air terminal over the period of time of the change.
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Citations
5 Claims
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1. An apparatus for determining the static pressure in a plenum of an adjustable air terminal of an air distribution system having at least one adjustable air terminal in the plenum for varying the volume of air into a space, comprising:
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means for sensing the temperature of space; means for setting the set point of the desired temperature of the space; means for adjusting the air flow through the terminal into the space to adesired air flow Fd responsive to the difference between the sensed temperature in the space and set point for the space whereby said means for adjusting the air flow is dependent upon the static pressure in the plenum for the adjustment; means for measuring the initial air flow Fi through the terminal at an initial time ti and for measuring the time for the air flow through the terminal to reach the desired flow td ; and means for converting the measured difference between the desired air flow Fd and the initial air flow Fi, and the initial time ti and the time to reach the desired flow td to the static pressure P in the plenum of the air terminal. - View Dependent Claims (2, 3)
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4. A method of determining the static pressure in a plenum of an adjustable air terminal of an air distribution system having at least one adjustable air terminal, the at least one adjustable air terminal having a variable volume adjustment means dependent upon the static pressure in the plenum for varying the volume of air into a space, comprising the steps of:
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determining the actual initial air flow Fi through the terminal at an initial time ti ; adjusting the air flow through the terminal to a desired air flow Fd in response to a space condition; determining the time for the air flow through the temrinal to reach the desired flow td from the initial time ti ; and converting the difference between the determined desired air flow Fd and the actual intial air flow Fi, and the initial time ti and the time to reach the desired flow td into a measure of the static pressure P in the plenum of the air terminal. - View Dependent Claims (5)
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Specification