Energy conservation enthalpy control system and sensor therefor

摘要

An energy conservation enthalpy control system utilizes a sensing unit for sensing the wet bulb temperature of sampled air, both outside air and return air, under conditions which approximate adiabatic saturation. The unit includes a housing adapted to pass filtered air through the unit. Water circulated throughout from a sump in the housing is intimately contacted and mixed with the air by a spray or an evaporative pad. A temperature sensing element located in the sump or in the airstream provides a signal indicating the wet bulb temperature of the air under adiabatic saturation conditions. The unit provides the inputs to a control system which operates to coordinate the operations of return air dampers, outside air dampers, and air conditioning equipment. When outside air reaches a wet bulb condition lower than the wet bulb condition of return air in the system, the control system operates to open or modulate the outside air dampers, close or modulate the return air dampers, and modulate or shutoff the chilled water in the system.