= log mean temperature difference, K or [degrees]F
This is because this heat exchanger presents the highest heat transfer duty combined with a low value of the LMTD
parameter (Cao, 2010).
is calculated per the classical formula: LMTD
= [LD - SD]/[ln(LD/SD)].
(U) = (Heat transfer)/ (Area of flow x LMTD
) = (7034) / ([pi] x 0.0064 x 0.45 x 28.43) = 27345W/[m.sup.2]k
All tested samples responded positively on recirculation velocity increase at both 50[degrees]C and 60[degrees]C, maintaining the identical driving force of LMTD
The overall UA values are indicated in Tables 1, 2, and 3 and also illustrated in Figure 11 with LMTD
for the four tests for the liquid overfeed flooded and the DX evaporator circuits.
where [[??].sub.comp] is the mass flow rate through the compressor, which can be estimated using a virtual sensor; [C.sub.p] is the refrigerant vapor specific heat; [T.,sub.dis,coil] is the reversing-valve high-side outlet temperature to the cycle (to the condenser); [T.sub.suc,coil] is the lowside inlet temperature from the cycle (from the evaporator); [T.sub.dis,comp] is the high-side inlet temperature from the compressor; [T.sub.suc,comp] is the temperature of the low-side outlet to the compressor; and LMTD
is a logarithmic mean temperature difference calculated by
, Fontes MAL, Oliveira-Filho ATde (2000) Tree species distribution in canopy gaps and mature forest in an area of cloud forest of the Ibitipoca Range, south-eastern Brazil.
CPO/sailors/Civilian who have been awarded Letter of Commendation are I M Zahid CMEA, M Riaz CMEA(H), Farhat Shah AA-II, M Saleem PO/WTR, M Sajjad PO/WTR, A H Shah L/CHEF, M Ejaz LMTD
, M R Hashmi GSO-II (Civ), M Arshad Baig HSM.
is computed with relation (1) and [DELTA][T.sub.max], [DELTA][T.sub.min] are shown in figure 3.
The temperature difference, LMTD
was determined from the inlet and exit temperatures (DBT) of the air flowing through the evaporator and from the inlet and outlet saturation temperature of refrigerant flowing in the test section.
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