REFPROP: A Thermodynamic Properties Software Program for Refrigerants and Their Mixtures

Experimental hear transfer coefficients are reponed for a tern ary refri!!:eranr blend compo;,.cl of ~u··~ HCFC-!2~ .. l6'~ HC f( ·:2:2. and :2~'1 HFC ·l.52a. Th~> blend is a possible substnnte for C. f('.1~ in 1·apor compression refrkerarion cyd~s. Two-phas e hear transfer coefficrenr< were determined for the pure blend and CFC'-12. The experiments were conducted over a rna;; flux ran~e of l~.J to ~00 ~~'. The heat aanBfer coefficient> were determined r na honzontal smooth tube :l.66 111 lon~ wllh an insrde dia1neter of ~.0 rnm. ·Hear tr ansfer coefficients for the blend were (ound 10 be 1:2 to 25'~ ht!!:her for eYaporalion and l2 to .)Q'r hi~; Ru: rhat are more r<'presentative of t hose that will b~ found rn actual >)'3tems. ( ompann~ a refrigeration cycle for the the blend an d one for CFC-12 thar supply mnilar coolin~ capanties shows that the blend bas a lower flow rate in th~ en1porator and condemer hecause the enthalp~· of vaponzation is higher. At a Similar c ooling capacity 1n an ~vaporator. the rarw ol the blend to ( FC-12 heat uansfer coefficients for the same tube diameter is 0.'·' to 1.0. while at a Sllllilat heattng capacity in a condenser !he ra110 is Q.Q,~ !0 1.05.