Surface treatment technology-Fluoroplastic heat exchanger technology-chromium plating technology-electroplating ceramics-chromic acid regeneration-hard oxidation
 『Chromium platingHeat exchanger

This picture shows fluoroplastic heat exchanger technology, electroplated ceramics, hard oxidation, chromic acid regeneration, chromium plating technology, etc

Contact us

Heat transfer

Home > Other > Heat transfer
Calculation of heat transfer area of fluoroplastic heat exchanger

Heat exchangers made of plastics such as fluoroplastics include tube bundle immersion, column tube, spiral tube, etc., which can be used for both heating and cooling.The calculation method of heat transfer area is as follows:

1.Calculation method of heat transfer area
Temperature rise
(1) Heat exchange Q (-W.h)
Q=1.16 β.γ c.V (T2-T1)
β-heat loss coefficient (1.05 ~ 1.3) γ-liquid density (kg/L) c-liquid specific heat (kcal/kg)
v-liquid volume (L) T1-liquid initial temperature (℃) T2-liquid process temperature (i.e.process temperature)
(2) heat exchange area S (-m2)
S=Q/(Δ T.κ.h)
Q-heat exchange (W.h) h-heat exchange duration (h) κ-heat transfer coefficient (150 ~ 350 W/m2.℃)
Δ T-average temperature (℃)
Δ T is calculated as follows:
-if the heat transfer is latent heat (e.g.steam)
Δ T ≈ (Ty-Tx)/Ln [(Tz-Tx)/(Tz-Ty)]
where Tz-saturated steam temperature (℃)
Tx-initial liquid temperature (℃) Ty-liquid process temperature (℃)
-if the heat transfer is sensible heat ( water)
Δ T ≈ [(T1-Ty)-(T2-Tx)]/Ln [(T1-Ty)/(T2-Tx)]
T1-inlet temperature (℃) T2-outlet temperature (℃)
Tx-initial liquid temperature (℃) Ty-liquid process Temperature (℃)

(1) Calculating heat exchange q (-W)
β-additional coefficient (1.1 ~ 1.3) V-working voltage (v) I-working current (a)
(2)  Calculating heat exchange area s (-m2)
s=q/(Δ T.kappa)
q-heat exchange (W) κ-heat exchange coefficient Δ T-average temperature (℃)
-If direct cooling in tube bundle tank
Δ T ≈ ( T2-T1)/Ln [(T-T1)/(T-T2)]
where T-process temperature
T1-refrigerant inlet temperature
T1-refrigerant inlet temperature
T2-refrigerant inlet temperature
T2 is a natural logarithm
T2 mainly depends on the flow rate of circulating pump and Interrelation of heat exchange

2.Check calculation of heat exchange area
S=d × 3.14 × n × l × m
where d-nominal pipe diameter of plastic pipe (m) L-average length of plastic pipe (m)
n-number of plastic pipes in each heat exchanger group m-number of heat exchanger groups

3.Explain that
heat transfer coefficient depends not only on heat transfer mode, heat exchanger material and tube wall thickness of material, but also on many factors such as solution state (such as stirring or flow speed).Generally, the upper limit is desirable for steam heating, and the lower limit is desirable for hot water heating or refrigerant cooling.

【All rights reserved. Please indicate the source and link of this article】

Last:Introduction of heat exchanger (heat exchanger)

Next:Corrosion-resistant heat exchange equipment and its application

  • Wechat
  • Mobile
  • E-mail
  • Navigation Guestbook Online QQ Google Search