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. 2019 Aug 2;21(8):757. doi: 10.3390/e21080757
Acronyms
COP Coefficient of performance
AC Air cooler
AH Air heater
AF Adsorption circuit fan
DF Desorption circuit fan
RHX Regenerative heat exchanger
DEC Direct evaporative cooler
Greek symbols
η Efficiency
ν Dynamic viscosity Pas1
ρ Density kgm3
Symbols
A Heat exchange surface m2
c Specific heat Jkg1K1
d Channel dimension of the RHX m
ex Specific exergy Jkg1
ex˙dest Specific exergy destruction Jkg1
E Parameter of the heat exchanger -
Ex˙ Flow of exergy W
Ex˙dest Exergy destruction W
F Correction factor -
h Specific enthalpy Jkg1
Hev Heat of evaporation Jkg1
k Overall heat transfer coefficient Wm2K1
l Channel dimension of the RHX m
m˙ Mass flow kgs1
NTU Number of heat transfer units -
p pressure Pa
P Temperature ratio -
Q Heat flow W
R Individual gas constant Jmol1K1
Rc Heat capacity ratio -
s Specific entropy Jkg1K1
T Temperature K
U Velocity ms1
w Channel dimension of the air heater/cooler m
X Specific humidity ratio kgkg1
X¯ Specific humidity ratio on a molar basis molmol1
Subscripts
0 Dead state
a Air
Carnot The Carnot cycle
dest Destruction
ex Exergy
H Heat source
in Inlet
L Cooling effect
M Heat sink
v Vapor
w Water