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Evaporator Pipes or Bunker Coils
The vitally important cooling process depends on these heat exchangers which incorporate a network of piping with flooding accumulator, served by expansion valve at the inlet and suction valve at the outlet.

Pipe Size normally used : 40mm NB Black Heavy Plain Ended (BHPE) Steel Pipes

The pipe surface is a function of the cooling to be achieved in the warehouse, and the heat transfer coefficient of pipes. For instance every 1 TR heat load for the flooded evaporator and a temperature difference of 30°F during the peak loading period, approx 240 rft of 40mm NB BHPE evaporator coils would be required under air agitation of ceiling fans.

Basis of pipe selection : Each set of bunker cooling coils normally comprises 40mm NB black heavy pipes and are usually between 50 to 60' long x 8 rows x 6 pipes high, using 40mm NB U-bend from 2 ft. long pipe with 5 ½" tube centers. The clearance between consecutive rows is kept about 6" to 8".