3.2. Radiation networkThe dryer cou

3.2. Radiation network
The dryer could be considered as a three-surface enclosure with
a radiation network as shown in Fig. 3. Surface C (chamber wall
surface) was reradiating and was assumed to be insulated. Therefore,
the effect of convection was assumed to be negligible. Since,
with Qc = 0, the net radiation transfer from the FIR heater surface
must equal to the net radiation transfer to the banana surface
(AB). The radiation network in this case is a simple parallel connection
and the rate of radiation heat transfer at the banana surface
(QB) can be obtained directly from:
QB ¼
rðT4
FIR  T4Þ
Rnet
ð3Þ
where,
Rnet ¼
1  eH
AHeH
þ AHFHB þ
1
ð1=AHFHCÞ þ ð1=ABFBCÞ
 1
þ
1  eB
ABeB
The emissivity of the far-infrared radiator (eH) was taken from
the manufacturer as 0.9 (Meeso et al., 2007), while the emissivity
of banana (eB) obtained from the literature was set also at 0.90
(Phoungchandang and Woods, 2000).