Information handling system thermal control by energy conservation
First Claim
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1. An information handling system comprising:
- an enclosure having an inlet and an outlet;
plural components disposed in the enclosure and operable to cooperate to process information;
a cooling fan disposed in the enclosure and operable to generate a cooling airflow from the inlet to the outlet with a selected of plural available fan speeds;
a power supply operable to power the plural components;
an inlet temperature sensor operable to sense airflow temperature at the inlet; and
a thermal manager interfaced with the cooling fan, power supply and inlet temperature sensor, the thermal manager operable to apply power dissipated by the power supply to one or more of the components and the inlet airflow temperature to set a speed of the cooling fan that maintains a predetermined thermal state in the enclosure proximate the one or more of the components, the thermal manager further operable to determine that the plural available fan speeds will not maintain the predetermined thermal state and, in response, to select one or more components of the one or more components to power down to allow available fan speeds to maintain the predetermined thermal state, the selected component having a predetermined thermal profile.
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Abstract
A thermal state within an information handling system enclosure is managed within predetermined constraints by estimating thermal energy introduced to the enclosure by power dissipation to electronic components and thermal energy removed from the enclosure by a cooling airflow generated by a fan. A desired bulk temperature of a cooling airflow is attained at a predetermined position in an enclosure by selecting a fan speed and power allocation to the components that conserves energy within the enclosure at a predetermined thermal state.
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Citations
19 Claims
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1. An information handling system comprising:
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an enclosure having an inlet and an outlet; plural components disposed in the enclosure and operable to cooperate to process information; a cooling fan disposed in the enclosure and operable to generate a cooling airflow from the inlet to the outlet with a selected of plural available fan speeds; a power supply operable to power the plural components; an inlet temperature sensor operable to sense airflow temperature at the inlet; and a thermal manager interfaced with the cooling fan, power supply and inlet temperature sensor, the thermal manager operable to apply power dissipated by the power supply to one or more of the components and the inlet airflow temperature to set a speed of the cooling fan that maintains a predetermined thermal state in the enclosure proximate the one or more of the components, the thermal manager further operable to determine that the plural available fan speeds will not maintain the predetermined thermal state and, in response, to select one or more components of the one or more components to power down to allow available fan speeds to maintain the predetermined thermal state, the selected component having a predetermined thermal profile. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method for managing a thermal state in an information handling system enclosure, the method comprising:
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powering components in the enclosure to process information; flowing air with a fan from an inlet over the components to an outlet; sensing the temperature of the air at the inlet; sensing power dissipated by the powering components in the enclosure; applying the inlet temperature and the power dissipated to determine a speed for the fan that maintains a predetermined thermal state at a predetermined position within the enclosure; determining that available fan speeds will not maintain the predetermined thermal state; and in response to determining, selecting one or more components of the components to power down to allow available fan speeds to maintain the predetermined thermal state, the selected component having a predetermined thermal profile. - View Dependent Claims (11, 12, 13, 14, 15, 16)
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17. A system for managing a thermal state in an information handling system enclosure, the system comprising:
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a fan operable to provide a cooling airflow at plural selectable speeds; a temperature sensor operable to sense air temperature at an inlet of the information handling system enclosure; a power manager operable to determine power provided to run electronic components disposed within the information handling system enclosure, the electronic components operable to cooperate to process information; and a thermal manager interfaced with the fan, the temperature sensor and the power manager, the thermal manager operable to apply the sensed inlet air temperature and the determined power for a set of less than all of the components to select a fan speed to manage the thermal state in the information handling system enclosure associated with the set of less than all of the components within predetermined constraints; wherein the thermal manager is further operable to determine that none of the plural selectable fan speeds will maintain the predetermined constraints and, in response, to select one or more components of the components to power down to allow a selected of the plural selectable fan speeds to maintain the predetermined constraints, the selected component having a predetermined thermal profile. - View Dependent Claims (18, 19)
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Specification