Enthalpy calculator
First Claim
1. An enthalpy computing system for use in controlling an environmental condition of a room, comprising:
- a temperature sensor having an output RT indicative of temperature;
a humidity sensor having an output CS indicative of humidity;
an electronic circuit having the output RT as a first input and the output CS as a second input, wherein the electronic circuit provides an output h of the form;
space="preserve" listing-type="equation">h=K1+K2*F1(RT)+K3*F2(CS)+K4*F1(RT)*F2(CS);
a source of energy controlled air;
a source of external air;
a damper, connected to the source external air and further connected to the source of energy controlled air, wherein a position of the damper determines how much of the external air and the energy controlled air is provided to the room, and wherein the position of the damper is based on the output h.
2 Assignments
0 Petitions
Accused Products
Abstract
A method and apparatus for controlling an environmental parameter is disclosed. The apparatus includes a source of energy controlled air and a source of external air. A damper determines the amount of external air and energy controlled air provided to the room. A control circuit controls the position of the damper in response to an enthalpy calculator. The enthalpy calculator includes a temperature sensitive resistor having a resistance RT and a relative humidity sensitive capacitor wherein the capacitance of the relative humidity sensitive capacitor is CS. An electronic circuit includes RT and CS and provides an output h: ##EQU1## The method includes the steps of providing energy controlled air and external air. The temperature and humidity of the external air are sensed, and the enthalpy is calculated using the equation ##EQU2## where t is the temperature and RH is the relative humidity. The amount of external air provided is adjusted using the calculated enthalpy as a parameter.
62 Citations
38 Claims
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1. An enthalpy computing system for use in controlling an environmental condition of a room, comprising:
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a temperature sensor having an output RT indicative of temperature; a humidity sensor having an output CS indicative of humidity; an electronic circuit having the output RT as a first input and the output CS as a second input, wherein the electronic circuit provides an output h of the form;
space="preserve" listing-type="equation">h=K1+K2*F1(RT)+K3*F2(CS)+K4*F1(RT)*F2(CS);a source of energy controlled air; a source of external air; a damper, connected to the source external air and further connected to the source of energy controlled air, wherein a position of the damper determines how much of the external air and the energy controlled air is provided to the room, and wherein the position of the damper is based on the output h. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. An enthalpy computing system for use in controlling an environmental condition of a room, comprising:
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a temperature sensor having an output RT indicative of temperature; a humidity sensor having an output CS indicative of humidity; an electronic circuit having the output RT as a first input and the output CS a second input, wherein the circuit provides an output h of the form;
##EQU18## a source of energy controlled air;
a source of external air;a damper, connected to the source of external air and further connected to the source of energy controlled air, wherein a position of the damper determines how much of the external air and the energy controlled air is provided to the room, and wherein the position of the damper is based on the output h. - View Dependent Claims (14)
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15. The enthalpy computing system 14, wherein RT is given by:
- ##EQU19## where a, b and c are constants and T is the temperature.
- View Dependent Claims (16, 17, 18, 19)
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20. An enthalpy computing system for use in controlling an environmental condition of a room, comprising:
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a temperature sensor having an output RT indicative of temperature; a humidity sensor having an output CS indicative of temperature; an electronic circuit having the output RT as a first input and the output CS a second input, wherein the circuit provides an output h and models the equation;
##EQU21## and T is temperature and a1-a6 are constants;
a source of energy controlled air;a source of external air; a damper, connected to the source of external air and further connected to the source of energy controlled air, wherein a position of the damper determines how much of the external air and the energy controlled air is provided to the room, and wherein the position of the damper is based on the output h. - View Dependent Claims (21, 22, 23, 24, 25, 26)
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27. A system for controlling an environmental parameter of a room, comprising:
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a source of energy controlled air; a source of external air; a damper, connected to the source of external air and further connected to the source of energy controlled air, wherein a position of the damper determines whether the external air is provided to the room; a control circuit comprising; a temperature sensor having an output RT indicative of temperature; a humidity sensor having an output CS indicative of humidity; an electronic circuit having RT as a first input and the CS a second input, wherein the circuit provides an output h and models the equation;
##EQU25## and T is temperature and a1-a6 are constants, and wherein the control circuit is connected to the damper and controls the position of the damper with the output h of the circuit being a parameter used to determine the position of a damper. - View Dependent Claims (28, 29, 30, 31, 32, 33, 34)
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35. A method for controlling an environmental parameter of a room, comprising:
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providing energy controlled air; providing external air; sensing the temperature of the external air; sensing the humidity of the external air; using an electronic circuit to calculate enthalpy based on the equation ##EQU29## and T is temperature, RH is relative humidity a1-a6 are constants, and t is the temperature and; adjusting a damper position to control the amount of external air with the calculated enthalpy being a parameter used to determine the damper position. - View Dependent Claims (36, 37, 38)
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Specification