Energy recovery ventilation effectiveness calculation and indication

Abstract

This disclosure relates generally to air handling systems for buildings, more particularly to energy recovery ventilation systems, and specifically to a calculation/estimation of effectiveness which may be used for informational and maintenance purposes.

1 - 17 . (canceled) 
     
     
         18 . A method, comprising:
 receiving a temperature indication at a processor;   calculating a saturated water vapor pressure of an air handling system using the processor, based at least in part on the received temperature indication;   calculating an effectiveness metric of the system using the processor, based at least in part on the calculated saturated water vapor pressure; and   generating a display that includes the calculated effectiveness metric.   
     
     
         19 . The method of  claim 18 , further comprising:
 calculating a humidity ratio at saturation using a processor, based at least in part on a calculated saturated water vapor pressure; and   calculating the effectiveness metric of the system using the processor, based at least in part on the calculated humidity ratio at saturation.   
     
     
         20 . The method of  claim 19 , further comprising:
 calculating a degree of saturation using the processor, based at least in part on the calculated humidity ratio at saturation; and   calculating the effectiveness metric of the system using the processor, based at least in part of the calculated degree of saturation.   
     
     
         21 . The method of  claim 20 , further comprising:
 calculating an air humidity ratio of the system using the processor, based at least in part on the calculated degree of saturation; and   calculating the effectiveness metric of the system using the processor, based at least in part of the calculated air humidity ratio.   
     
     
         22 . The method of  claim 21 , further comprising:
 calculating an air enthalpy of the system using the processor, based at least in part on the calculated air humidity ration of the system; and   calculating the effectiveness metric of the system using the processor, based at least in part of the calculated air humidity ratio.   
     
     
         23 . The method of  claim 18 , further comprising:
 calculating a degree of saturation using the processor, based at least in part on a calculated humidity ratio at saturation; and   calculating the effectiveness metric of the system using the processor, based at least in part of the calculated degree of saturation.   
     
     
         24 . The method of  claim 18 , further comprising:
 calculating an air humidity ratio of the system using the processor, based at least in part on a calculated degree of saturation; and   calculating the effectiveness metric of the system using the processor, based at least in part of the calculated air humidity ratio.   
     
     
         25 . The method of  claim 18 , further comprising:
 calculating an air enthalpy of the system using the processor, based at least in part on a calculated air humidity ration of the system; and   calculating the effectiveness metric of the system using the processor, based at least in part of the calculated air humidity ratio.   
     
     
         26 . The method of  claim 18 , further comprising:
 calculating a humidity ratio at saturation using a processor and Equation 3 of the specification, based at least in part on a calculated saturated water vapor pressure; and   calculating the effectiveness metric of the system using the processor, based at least in part on the calculated humidity ratio at saturation.   
     
     
         27 . The method of  claim 19 , further comprising:
 calculating a degree of saturation using the processor and Equation 4 of the specification, based at least in part on the calculated humidity ratio at saturation; and   calculating the effectiveness metric of the system using the processor, based at least in part of the calculated degree of saturation.   
     
     
         28 . The method of  claim 20 , further comprising:
 calculating an air humidity ratio of the system using the processor and Equation 5 of the specification, based at least in part on the calculated degree of saturation; and   calculating the effectiveness metric of the system using the processor, based at least in part of the calculated air humidity ratio.   
     
     
         29 . The method of  claim 21 , further comprising:
 calculating an air enthalpy of the system using the processor and Equation 6 of the specification, based at least in part on the calculated air humidity ration of the system; and   calculating the effectiveness metric of the system using the processor, based at least in part of the calculated air humidity ratio.   
     
     
         30 . The method of  claim 18 , further comprising:
 calculating a degree of saturation using the processor and Equation 4 of the specification, based at least in part on a calculated humidity ratio at saturation; and   calculating the effectiveness metric of the system using the processor, based at least in part of the calculated degree of saturation.   
     
     
         31 . The method of  claim 18 , further comprising:
 calculating an air humidity ratio of the system using the processor and Equation 5 of the specification, based at least in part on a calculated degree of saturation; and   calculating the effectiveness metric of the system using the processor, based at least in part of the calculated air humidity ratio.   
     
     
         32 . The method of  claim 18 , further comprising:
 calculating an air enthalpy of the system using the processor and equation 6 of the specification, based at least in part on a calculated air humidity ration of the system; and   calculating the effectiveness metric of the system using the processor, based at least in part of the calculated air humidity ratio.   
     
     
         33 . An apparatus for determining an effectiveness indicator of an air handling system, comprising:
 an enthalpy wheel;   a first blower configured to move outside air into an air conditioning system through the enthalpy wheel;   a second blower configured to move processed air from the air conditioning system through the enthalpy system into a space; and   a processor configured to receive a temperature indication and to generate an effectiveness metric by calculating a saturated water vapor pressure of the air handling system, based at least in part on the received temperature indication   
     
     
         34 . The apparatus of  claim 33 , wherein the processor is further configured to:
 calculate a humidity ratio at saturation based at least in part on a calculated saturated water vapor pressure; and   calculate the effectiveness metric of the system based at least in part on the calculated humidity ratio at saturation.   
     
     
         35 . The apparatus of  claim 34 , wherein the processor is further configured to:
 calculate a degree of saturation based at least in part on the calculated humidity ratio at saturation; and   calculate the effectiveness metric of the system based at least in part of the calculated degree of saturation.   
     
     
         36 . The apparatus of  claim 35 , wherein the processor is further configured to:
 calculate an air humidity ratio of the system based at least in part on the calculated degree of saturation; and   calculate the effectiveness metric of the system based at least in part of the calculated air humidity ratio.   
     
     
         37 . In an apparatus for determining an effectiveness indicator of an air handling system having an enthalpy wheel, a first blower configured to move outside air into an air conditioning system through the enthalpy wheel, a second blower configured to move processed air from the air conditioning system through the enthalpy system into a space and a processor configured to receive a temperature indication and to generate an effectiveness metric by calculating a saturated water vapor pressure of the air handling system, based at least in part on the received temperature indication, the processor is further configured to calculate a humidity ratio at saturation based at least in part on a calculated saturated water vapor pressure and calculate the effectiveness metric of the system based at least in part on the calculated humidity ratio at saturation, the processor is further configured to calculate a degree of saturation based at least in part on the calculated humidity ratio at saturation and calculate the effectiveness metric of the system based at least in part of the calculated degree of saturation, the processor is further configured to calculate an air humidity ratio of the system based at least in part on the calculated degree of saturation and calculate the effectiveness metric of the system based at least in part of the calculated air humidity ratio, a method, comprising:
 calculating a saturated water vapor pressure of an air handling system using the processor, based at least in part on a received temperature indication;   calculating a humidity ratio at saturation using a processor, based at least in part on a calculated saturated water vapor pressure;   calculating a degree of saturation using the processor, based at least in part on the calculated humidity ratio at saturation;   calculating an air humidity ratio of the system using the processor, based at least in part on the calculated degree of saturation;   calculating an air enthalpy of the system using the processor, based at least in part on the calculated air humidity ratio of the system;   calculating an effectiveness metric of he system using the processor, based at least in part on the calculated air enthalpy; and   generating a display that includes the calculated effectiveness metric.