System and method for compressor capacity modulation in a heat pump
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
F25B-001/00
F25B-049/00
F25B-013/00
출원번호
US-0498259
(2009-07-06)
등록번호
US-8650894
(2014-02-18)
발명자
/ 주소
Tolbert, Jr., John Willard
출원인 / 주소
Bristol Compressors International, Inc.
대리인 / 주소
McNees Wallace & Nurick LLC
인용정보
피인용 횟수 :
1인용 특허 :
78
초록▼
A system and method is provided to control and operate a compressor to have two or more discrete output capacities in response to an outdoor temperature measurement. During operation of the compressor in an air conditioning or cooling mode, the compressor has a first output capacity in response to t
A system and method is provided to control and operate a compressor to have two or more discrete output capacities in response to an outdoor temperature measurement. During operation of the compressor in an air conditioning or cooling mode, the compressor has a first output capacity in response to the outdoor temperature being greater than a first temperature setpoint and the compressor has a second output capacity in response to the outdoor temperature being less than a second temperature setpoint. During operation of the compressor in a heating mode, the compressor has different output capacities based on the outdoor ambient temperature.
대표청구항▼
1. A method for modulating capacity in a compressor for a heat pump operating in a heating mode, the method comprising: providing a controller operable to provide control signals to generate a plurality of preselected output frequencies for a motor of a compressor;measuring an outdoor ambient temper
1. A method for modulating capacity in a compressor for a heat pump operating in a heating mode, the method comprising: providing a controller operable to provide control signals to generate a plurality of preselected output frequencies for a motor of a compressor;measuring an outdoor ambient temperature;comparing the measured outdoor ambient temperature to a plurality of temperature setpoints, each temperature setpoint of the plurality of temperature setpoints being associated with a preselected output frequency of the plurality of preselected output frequencies, each preselected output frequency of the plurality of preselected output frequencies progressively increases in value as each associated temperature setpoint of the plurality of temperature setpoints progressively decreases in value;selecting a preselected output frequency of the plurality of preselected output frequencies based on the measured outdoor ambient temperature being less than a temperature setpoint of the plurality of temperature setpoints, the selected preselected output frequency being associated with a minimum temperature setpoint of the temperature setpoints greater than the measured outdoor ambient temperature;operating the motor at the selected preselected output frequency and a corresponding voltage to produce a corresponding output capacity for the compressor. 2. The method of claim 1 further comprising repeating the steps of measuring an outdoor ambient temperature, comparing the measured outdoor ambient temperature, selecting a preselected output frequency, and operating the motor at the selected preselected output frequency until a demand for heating is satisfied. 3. The method of claim 1 further comprising the step of executing a start-up process for the compressor, the step of executing a start-up process for the compressor includes: receiving a first stage heating signal indicating a demand for heating; andoperating the motor at a predetermined startup frequency and a corresponding voltage to produce a corresponding output capacity for the compressor. 4. The method of claim 1 further comprising: determining whether a demand for additional heating is present; andexecuting the steps of selecting a preselected output frequency and operating the motor at the selected preselected output frequency in response to no demand for additional heating being present. 5. The method of claim 4 further comprising the step of: determining whether an operating frequency for the motor is less than a predetermined frequency in response to a demand for additional heating being present;executing the steps of selecting a preselected output frequency and operating the motor at the selected preselected output frequency in response to the operating frequency for the motor being greater than the predetermined frequency; andoperating the motor at the predetermined frequency in response to the operating frequency for the motor being less than a predetermined frequency. 6. The method of claim 4 further comprising the step of: determining whether the demand for additional heating has been present more than one time in response to a demand for additional heating being present;executing the steps of selecting a preselected output frequency and operating the motor at the selected preselected output frequency in response to the demand for additional heating being present more than one time; andselecting a preselected output frequency of the plurality of preselected output frequencies greater than an operating frequency of the motor in response to the demand for additional heating being present one time. 7. The method of claim 6 wherein the step of selecting a preselected output frequency of the plurality of preselected output frequencies greater than an operating frequency of the motor includes selecting a next greater preselected output frequency of the plurality of preselected output frequencies. 8. The method of claim 1 further comprising programming by a user, at least one temperature setpoint of the plurality of temperature setpoints. 9. The method of claim 1 further comprising programming, by a user, at least one preselected output frequency of the plurality of preselected output frequencies. 10. The method of claim 1 wherein: the plurality of preselected output frequencies includes at least two preselected output frequencies selected from the group consisting of about 35 Hz, about 45 Hz, about 60 Hz, about 80 Hz, about 100 Hz and about 120 Hz; andthe plurality of temperature setpoints includes at least two temperature setpoints selected from the group consisting of about 50° F., about 40° F., about 30° F., about 20° F., about 10° F. and about 0° F. 11. The method of claim 1 wherein a preselected output frequency of 35 Hz has an associated temperature setpoint of 50° F., a preselected output frequency of 45 Hz has an associated temperature setpoint of 40° F., a preselected output frequency of 60 Hz has an associated temperature setpoint of 30° F., a preselected output frequency of 80 Hz has an associated temperature setpoint of 20° F., a preselected output frequency of 100 Hz has an associated temperature setpoint of 10° F., a preselected output frequency of 120 Hz has an associated temperature setpoint of 0° F. 12. The method of claim 1 wherein the plurality of preselected output frequencies are separated by at least 5 Hz. 13. An HVAC&R system comprising: a compressor, a condenser and an evaporator connected in a closed refrigerant loop;a motor connected to the compressor to power the compressor, the motor being configured to operate at a plurality of output speeds to generate a plurality of output capacities from the compressor;a control system, the control system being configured to provide the motor with a plurality of preselected output frequencies to generate the plurality of output speeds in the motor;a sensor to measure an outdoor ambient temperature and to provide a signal to the control system with the measured outdoor ambient temperature; andwherein, in response to the HVAC&R system operating in a heating mode, the control system being configured to provide a preselected output frequency of the plurality of preselected output frequencies to the motor based on the measured outdoor ambient temperature being less than a temperature setpoint of a plurality of temperature setpoints, each temperature setpoint of the plurality of temperature setpoints being associated with a preselected output frequency of the plurality of preselected output frequencies, each preselected output frequency of the plurality of preselected output frequencies progressively increases in value as each associated temperature setpoint of the plurality of temperature setpoints progressively decreases in value, the provided preselected output frequency being associated with a minimum temperature setpoint of the temperature setpoints greater than the measured outdoor ambient temperature. 14. The HVAC&R system of claim 13 wherein the sensor is a temperature sensor. 15. The HVAC&R system of claim 13 further comprising a thermostat, the thermostat being configured to provide one of a first stage heating signal or a second stage heating signal to the control system, and wherein a second stage heating signal indicates a greater demand for heating than a first stage heating signal. 16. The HVAC&R system of claim 15 wherein the control system is configured to provide a preselected output frequency of the plurality of preselected output frequencies to the motor greater than an operating frequency of the motor to generate an increase in the output capacity of the compressor in response to receiving a second stage heating signal for a first time. 17. The HVAC&R system of claim 13 wherein the plurality of temperature setpoints are programmable by a user. 18. The HVAC&R system of claim 13 wherein the plurality of preselected output frequencies are programmable by a user. 19. The HVAC&R system of claim 13 wherein: the plurality of preselected output frequencies includes at least two preselected output frequencies selected from the group consisting of about 35 Hz, about 45 Hz, about 60 Hz, about 80 Hz, about 100 Hz and about 120 Hz; andthe plurality of temperature setpoints includes at least two temperature setpoints selected from the group consisting of about 50° F., about 40° F., about 30° F., about 20° F., about 10° F. and about 0° F. 20. The HVAC&R system of claim 13 wherein the plurality of preselected output frequencies are separated by at least 5 Hz. 21. The HVAC&R system of claim 13 wherein the control system comprises: a motor drive connected to the motor; anda controller, the controller being configured to receive the signal with the measured outdoor ambient temperature, determine the provided preselected output frequency and provide control signals to the motor drive to operate the motor at the provided preselected output frequency. 22. The HVAC&R system of claim 13 wherein the compressor is a reciprocating compressor and the motor is a switched reluctance motor. 23. A method for controlling capacity in a compressor of an HVAC&R system, the method comprising: providing a controller operable to provide control signals to generate a plurality of preselected output frequencies for a motor of the compressor;measuring an outdoor ambient temperature;determining whether the HVAC&R system is operating in a heating mode or a cooling mode;in response to the HVAC&R system operating in a heating mode, executing a heating mode operation process comprising: comparing the measured outdoor ambient temperature to a plurality of heating mode temperature setpoints, each heating mode temperature setpoint of the plurality of heating mode temperature setpoints being associated with a preselected heating mode output frequency of a plurality of preselected heating mode output frequencies, each preselected heating mode output frequency of the plurality of preselected heating mode output frequencies progressively increases in value as each associated heating mode temperature setpoint of the plurality of heating mode temperature setpoints progressively decreases in value;selecting a preselected heating mode output frequency of a the plurality of preselected heating mode output frequencies based on the measured outdoor ambient temperature being less than a heating mode temperature setpoint of the plurality of heating mode temperature setpoints, the selected preselected heating mode output frequency being associated with a minimum heating mode temperature setpoint of the heating mode temperature setpoints greater than the measured outdoor ambient temperature; andoperating the motor at the selected preselected heating mode output frequency and a corresponding voltage to produce a corresponding output capacity for the compressor; andin response to the HVAC&R system operating in a cooling mode, executing a cooling mode operation process comprising: comparing the measured outdoor ambient temperature to at least one predetermined temperature setpoint;selecting a preselected cooling mode output frequency of a plurality of preselected cooling mode output frequencies based on the comparison of the measured outdoor ambient temperature and the at least one predetermined temperature setpoint;operating the motor at the selected cooling mode preselected output frequency and a corresponding voltage to produce a corresponding output capacity for the compressor; andwherein the selected preselected cooling mode output frequency of the plurality of preselected cooling mode output frequencies progressively increases in response to the measured outdoor ambient temperature increasing to provide an increase in the output capacity of the compressor. 24. The method of claim 23 wherein the plurality of preselected output frequencies includes the plurality of preselected heating mode output frequencies and the plurality of preselected cooling mode output frequencies. 25. The method of claim 24 wherein the plurality of preselected output frequencies are separated by at least 5 Hz. 26. The method of claim 24 wherein the plurality of preselected heating mode output frequencies are different from each preselected cooling mode output frequency of the plurality of preselected cooling mode output frequencies. 27. The method of claim 24 wherein the plurality of preselected heating mode output frequencies includes at least one preselected cooling mode output frequency of the plurality of preselected cooling mode output frequencies. 28. The method of claim 23 wherein: the step of comparing the measured outdoor ambient temperature to at least one predetermined temperature setpoint includes: comparing the measured outdoor ambient temperature to a first predetermined temperature setpoint; andcomparing the measured outdoor ambient temperature to a second predetermined temperature setpoint; andthe step of selecting a preselected cooling mode output frequency of the plurality of preselected cooling mode output frequencies includes: selecting a first cooling mode output frequency and corresponding voltage in response to the measured outdoor ambient temperature being greater than the first predetermined temperature setpoint; andselecting a second cooling mode output frequency and corresponding voltage in response to the measured outdoor ambient temperature being less than or equal to the second predetermined temperature setpoint.
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