HVAC system, a method for operating the HVAC system and a HVAC controller configured for the same
First Claim
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1. A controller for a heating, ventilating and air conditioning (HVAC) system, the controller comprising:
- an interface configured to;
receive a comfort temperature set point for an enclosed space, the comfort temperature set point comprising a single set point used for both heating mode and cooling mode operation of the HVAC system; and
receive a sensed temperature for the enclosed space; and
a processor configured to;
operate the HVAC system in a conditioning mode of operation, the conditioning mode of operation being one of;
a heating mode and a cooling mode;
after operating the HVAC system in the conditioning mode of operation, determine whether to operate the HVAC system in an opposite conditioning mode based on a comparison of a total error value to a pre-determined threshold, wherein;
the opposite conditioning mode is the heating mode if the conditioning mode of operation is the cooling mode and the opposite conditioning mode is the cooling mode if the conditioning mode of operation is the heating mode;
the total error value is calculated as a sum of a proportional error and an integral error;
the proportional error is calculated based on a present value of a temperature error scaled according to a proportional gain value, the present value of the temperature error being calculated as a difference between the comfort temperature and the sensed temperature; and
the integral error is determined based on a change counter, wherein the integral error is set to zero when the change counter is below a change threshold, wherein the change counter is incremented or decremented according to a slope of the sensed temperature of the enclosed space over time;
in response to determining that the total error value exceeds the pre-determined threshold, operate the HVAC system in the opposite conditioning mode; and
in response to determining that the total error value does not exceed the pre-determined threshold, operate the HVAC system in a coasting mode.
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Abstract
In some embodiments, a controller for a heating, ventilating and air conditioning (HVAC) system comprises an interface and a processor. The interface receives a comfort temperature set point and a sensed temperature for the enclosed space. The comfort temperature set point comprises a single set point used for both heating and cooling mode operation of the HVAC system. The processor determines a total error value based on comparing the sensed temperature and comfort temperature set point, selects a mode of operation based on the total error value, and operates the HVAC system in the selected mode of operation.
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Citations
17 Claims
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1. A controller for a heating, ventilating and air conditioning (HVAC) system, the controller comprising:
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an interface configured to; receive a comfort temperature set point for an enclosed space, the comfort temperature set point comprising a single set point used for both heating mode and cooling mode operation of the HVAC system; and receive a sensed temperature for the enclosed space; and a processor configured to; operate the HVAC system in a conditioning mode of operation, the conditioning mode of operation being one of;
a heating mode and a cooling mode;after operating the HVAC system in the conditioning mode of operation, determine whether to operate the HVAC system in an opposite conditioning mode based on a comparison of a total error value to a pre-determined threshold, wherein; the opposite conditioning mode is the heating mode if the conditioning mode of operation is the cooling mode and the opposite conditioning mode is the cooling mode if the conditioning mode of operation is the heating mode; the total error value is calculated as a sum of a proportional error and an integral error; the proportional error is calculated based on a present value of a temperature error scaled according to a proportional gain value, the present value of the temperature error being calculated as a difference between the comfort temperature and the sensed temperature; and the integral error is determined based on a change counter, wherein the integral error is set to zero when the change counter is below a change threshold, wherein the change counter is incremented or decremented according to a slope of the sensed temperature of the enclosed space over time; in response to determining that the total error value exceeds the pre-determined threshold, operate the HVAC system in the opposite conditioning mode; and in response to determining that the total error value does not exceed the pre-determined threshold, operate the HVAC system in a coasting mode. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method for controlling a heating, ventilating and air conditioning (HVAC) system, the method comprising:
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receiving a comfort temperature set point for an enclosed space, the comfort temperature set point comprising a single set point used for both heating and cooling mode operation of the HVAC system; receiving a sensed temperature for the enclosed space; operating the HVAC system in a conditioning mode of operation, the conditioning mode of operation being one of;
a heating mode and a cooling mode;after operating the HVAC system in the conditioning mode of operation, determining whether to operate the HVAC system in an opposite conditioning mode based on a comparison of a total error value to a pre-determined threshold, wherein; the opposite conditioning mode is the heating mode if the conditioning mode of operation is the cooling mode and the opposite conditioning mode is the cooling mode if the conditioning mode of operation is the heating mode; the total error value is calculated as a sum of a proportional error and an integral error; the proportional error is calculated based on a present value of a temperature error scaled according to a proportional gain value, the present value of the temperature error being calculated as a difference between the comfort temperature and the sensed temperature; and the integral error is determined based on a change counter, wherein the integral error is set to zero when the change counter is below a change threshold, wherein the change counter is incremented or decremented based on a comparison of a slope of the sensed temperature of the enclosed space over time to a slope threshold; in response to determining that the total error value exceeds the pre-determined threshold, operate the HVAC system in the opposite conditioning mode; and in response to determining that the total error value does not exceed the pre-determined threshold, operate the HVAC system in a coasting mode. - View Dependent Claims (10, 11, 12, 13)
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14. A heating, ventilating and air conditioning (HVAC) system operable to condition an enclosed space, the HVAC system comprising:
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one or more heating components operable to heat to heat the enclosed space when the HVAC system is in a heating mode; one or more cooling components operable to cool the enclosed space when the HVAC system is in a cooling mode; one or more temperature sensors, the temperature sensors operable to sense temperature data associated with the enclosed space; and a controller operable to; receive a comfort temperature set point for the enclosed space, the comfort temperature set point comprising a single set point used for both the heating mode and the cooling mode operation of the HVAC system; and receive a sensed temperature from the temperature sensors; and operate the HVAC system in a conditioning mode of operation, the conditioning mode of operation being one of;
a heating mode and a cooling mode;after operating the HVAC system in the selected conditioning mode, determine whether to operate the HVAC system in an opposite conditioning mode based on a comparison of a total error value to a pre-determined threshold, wherein; the opposite conditioning mode is the heating mode if the conditioning mode of operation is the cooling mode and the opposite conditioning mode is the cooling mode if the conditioning mode of operation is the heating mode; the total error value is calculated as a sum of a proportional error and an integral error; the proportional error is calculated based on a present value of a temperature error scaled according to a proportional gain value, the present value of the temperature error being calculated as a difference between the comfort temperature and the sensed temperature; the integral error is determined based on a change counter, wherein the integral error is set to zero when the change counter is below a change threshold, wherein the change counter is incremented or decremented according to slope of the sensed temperature of the enclosed space over time; in response to determining that the total error value exceeds the pre-determined threshold, operate the HVAC system in the opposite conditioning mode; in response to determining that the total error value does not exceed the pre-determined threshold, operate the HVAC system in a coasting mode. - View Dependent Claims (15, 16, 17)
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Specification