Evaporator with one or more leak mitigation dampers
An HVAC/R system having: an HVAC/R component that has a heat exchanger, the HVAC/R component configured to allow a refrigerant to flow therethrough; a housing with the heat exchanger disposed there therein, and a supply side air conduit connected to the housing, the supply side air conduit being operably coupled to the HVAC/R component; a supply side leak mitigation damper operably coupled to the supply side air conduit; and wherein the supply side leak mitigation conduit is configured to selectively block airflow through the supply side air conduit.
1. An HVAC/R system comprising:
a controller;
a compressor that is operationally coupled to the controller;
an evaporator housing defining a supply side air conduit and a return side air conduit that are fluidly coupled to each other, wherein an upstream end of the return side air conduit defines an evaporator housing inlet and a downstream end of the supply side air conduit defines an evaporator housing outlet, wherein the housing is continuous between the housing inlet and the housing outlet, and
wherein:
between the supply and return side air conduits, the housing includes:
a fan controlled by a fan motor that is operationally coupled to the controller;
an HVAC/R component that is a microchannel heat exchanger disposed over a drain pan, the HVAC/R component configured to allow a refrigerant to flow therethrough via operation of the compressor, wherein the heat exchanger is disposed between the fan and the supply side air conduit; and
a refrigerant sensor that is adjacent to the heat exchanger and operationally coupled to the controller;
the supply side air conduit includes:
a supply side leak mitigation damper that is pivotally connected to the supply side air conduit and spring loaded to open when the fan motor is on and close and to block airflow through the supply side air conduit when the fan motor is off; and
the return side air conduit includes:
a return side leak mitigation damper that is pivotally connected to the return side air conduit and spring loaded to open when the fan motor is on and close to block airflow through the return side air conduit when the fan motor is off,
wherein, when the sensor senses leaked refrigerant, the controller is configured to prevent the compressor from running and turn on the fan motor, thereby opening the supply and return side leak mitigation dampers and directing air across the heat exchanger to dilute the leaked refrigerant.
2. The system of claim 1 , wherein the HVAC/R component is operably coupled to a furnace.
3. The system of claim 1 , wherein the HVAC/R component comprises a refrigeration unit.
4. A method of diluting a leaked refrigerant in the HVAC/R system of claim 1 , the method comprising:
determining by the controller that the sensor senses that a refrigerant leak has occurred;
activating the fan to direct air across the heat exchanger, and thereby opening the supply side leak mitigation damper.
5. The method of claim 4 , wherein:
the supply side leak mitigation damper is biased closed when the fan is inactive.