Heating, ventilation and air conditioning (HVAC) system and method using feedback linearization
First Claim
1. A heat transfer system, comprising:
- a first heat exchanger;
a second heat exchanger in thermal communication with a space; and
a processor for estimating an amount of heat transferred between the second heat exchanger and the space and altering a control parameter of the heat transfer system based on the estimated amount of heat transferred to control the heat transfer system;
whereinthe processor comprises a non-linear observer for estimating a plurality of state variables which define a state of the second heat exchanger, the non-linear observer estimating the state variables based on a non-linear model which describes dynamic behavior of the second heat exchanger, the non-linear observer using the estimates of the state variables to compute an estimate of the amount of heat transferred between the second heat exchanger and the space.
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Abstract
A new feedback linearization approach to advanced control of single-unit and multi-unit HVAC systems is described. In accordance with the approach of the invention, this new nonlinear control includes a model-based feedback linearization part to compensate for the nonlinearity in the system dynamics. Therefore, the evaporating temperature and superheat values can be controlled by linear PI control designs to achieve desired system performance and reliability. The main advantages of the new nonlinear control approach include (1) better performance even with large model errors, (2) being able to adapt to indoor unit turn on/off operation, (3) much smaller PI control gains compared to that of current feedback PI controls, (4) much easier design procedures since there is no need for tuning the PI control gains over wide range operation.
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Citations
52 Claims
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1. A heat transfer system, comprising:
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a first heat exchanger; a second heat exchanger in thermal communication with a space; and a processor for estimating an amount of heat transferred between the second heat exchanger and the space and altering a control parameter of the heat transfer system based on the estimated amount of heat transferred to control the heat transfer system;
whereinthe processor comprises a non-linear observer for estimating a plurality of state variables which define a state of the second heat exchanger, the non-linear observer estimating the state variables based on a non-linear model which describes dynamic behavior of the second heat exchanger, the non-linear observer using the estimates of the state variables to compute an estimate of the amount of heat transferred between the second heat exchanger and the space. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26)
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27. A method of heat transfer, comprising:
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providing a first heat exchanger; providing a second heat exchanger in thermal communication with a space; estimating an amount of heat transferred between the second heat exchanger and the space, estimating the amount of heat transferred between the second heat exchanger and the space comprising using a non-linear observer to estimate a plurality of state variables which define a state of the second heat exchanger, the non-linear observer estimating the state variables based on a non-linear model which describes dynamic behavior of the second heat exchanger, the non-linear observer using the estimates of the state variables to compute an estimate of the amount of heat transferred between the second heat exchanger and the space; and altering a control parameter based on the estimated amount of heat transferred to control the heat transfer system. - View Dependent Claims (28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52)
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Specification