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CONTROL OF AIR COOLING COILS.

Author(s) : AHERN W. R.

Type of article: Article

Summary

SINGLE STEP (ON-OFF) CONTROL REQUIRES PROPORTIONAL AND INTEGRAL FEEDBACK HEATERS PROPERLY APPLIED IN THE THERMOSTAT. MULTIPLE STEP SWITCHING OF COILS REQUIRES THE MINIMUM CAPACITY STEP TO BE NOT OVER 25 PERCENT OF THE TOTAL. CONTROL BY THROTTLING OF WATERFLOW REQUIRES THE MAXIMUM EFFORT TO LINEARISE RESPONSE AND THE USE OF PROPORTIONAL PLUS INTEGRAL RESPONSE CONTROL WITH WIDE PROPORTIONAL BAND. CONTROL BY THROTTLING AIR FLOW REQUIRES WELL DESIGNED AND ROBUST DAMPERS. DIRECT EXPANSION COILS REQUIRE TO BE CIRCUITED FOR HIGH REFRIGERANT VELOCITY FROM THEIR INLET TO BEYOND THE THERMOSTATIC EXPANSION VALVE THERMAL BULB POSITION. SPECIAL CARE SHOULD BE GIVEN TO DIRECT EXPANSION COILS SUBJECT TO VARIABLE AIR VELOCITY AS IN MULTIZONE PLANTS.

Details

  • Original title: CONTROL OF AIR COOLING COILS.
  • Record ID : 1983-1736
  • Languages: English
  • Source: Aust. Refrig. Air Cond. Heat. - vol. 36 - n. 10
  • Publication date: 1982/10
  • Document available for consultation in the library of the IIR headquarters only.

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