Low noise micro environmental workspace comfort unit

A low noise micro environmental workspace comfort unit for a workspace comprising:

• a comfort unit enclosure having a mounting flange to mount said comfort unit enclosure to a surface of a workspace;
• at least one louver mechanically coupled to said comfort unit enclosure provides an ambient air flow to a person working at said workspace;
• a controller to accept a set point from a person working at said workspace, said set point representing a desired rate of ambient air flow;
• at least one ambient air fan mounted to a wall of said comfort unit enclosure and electrically coupled to a fan speed control module, said fan speed control module operatively coupled to said controller;
• at least one heated air fan mounted to said wall or another wall of said comfort unit enclosure at a different place than said at least one ambient air fan, said at least one heated air fan comprising a heating element mechanically coupled to said heated air fan;
• and
• at least one heated air outlet to direct air heated by said heated air fan to a person working at said workspace.

A method for minimizing fan noise of a low noise micro environmental workspace comfort unit comprising:

• providing a low noise micro environmental workspace comfort unit comprising a solid state relay (SSR) fan speed circuit operatively coupled to a comfort unit controller having a comfort unit controller PWM output terminal, said comfort unit controller to set a PWM waveform at a comfort unit controller output terminal;
• generating a PWM frequency between about 12 Hz and 250 Hz at said comfort unit controller PWM output terminal;
• measuring a fan noise sound level and a fan air speed at said PWM frequency;
• repeating said step of generating to said step of measuring between a fan speed above about a fan stall speed and about a maximum fan air flow;
• determining a set of PWM frequencies having a minimal fan noise and maximum fan air flow for each of a predetermined number of discrete fan speed settings;
• and
• configuring a firmware or software stored on a non-volatile memory and that runs on said comfort unit controller, so that said comfort unit controller provides a person working at said low noise micro environmental workspace comfort unit, a selection of a fan speed from a set of discrete fan speed settings.