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US 9,810,469 B2Granted
Variable fan speed control in HVAC systems and methods
AssigneeTrane International Inc.
InventorMichael Carl Boehde
Life of this patent
Estimating the term…
Abstract
Generally, a variable fan speed control in an HVAC system is described. Such methods and systems to control fan speed can in turn improve efficiency of the HVAC system by minimizing power consumption, for example of the compressor. The control scheme is based on various operating conditions of compressor load and ambient air temperature, which are used to determine an optimum fan speed.
Claims7
A method of controlling condenser fans in a heating, ventilation, and air conditioning (HVAC) system, comprising:
- detecting, with a device to detect ambient air temperature, ambient air temperature;
- obtaining, with a device to obtain compressor present load, a present load on a variable speed compressor;
- determining, with a controller, a target differential pressure between a condenser and an evaporator based on the ambient air temperature detected and the present load on the variable speed compressor obtained;
- outputting, with the controller, a condenser fan speed suitable to achieve the target differential pressure determined;
- and
- controlling one or more fans based on the output of condenser fan speed to obtain a fan capacity suitable to control one or more condenser fans, such that power of the HVAC system is managed through a power consumed by the variable speed compressor and the fans.
3 more elements
A heating, ventilation, and air conditioning (HVAC) system, comprising:
- a variable speed compressor;
- an evaporator fluidly connected to the variable speed compressor;
- a condenser fluidly connected to the variable speed compressor;
- the condenser including one or more condenser fans;
- a device to detect ambient air temperature;
- a device to obtain present load on the variable speed compressor;
- and
- a controller operatively connected to the device to detect ambient air temperature, to the device to obtain present load on the variable speed compressor, and to the condenser including the one or more condenser fans;
- the controller configured to determine a target differential pressure between the condenser and the evaporator based on the ambient air temperature detected and the present load on the variable speed compressor obtained,
- the controller configured to determine an output of condenser fan capacity suitable to achieve the target differential pressure determined, and
- the controller configured to operate the one or more condenser fans based on the output of condenser fan capacity, such that power of the HVAC system is managed through power consumed by the variable speed compressor and the one or more condenser fans.
8 more elements
Dependencies are inferred from the claim text.