2. In the counter flow heat exchanger, the water at 20°C is used to cool the liquid from 80°C to 30°C, and the volumetric flow rate of the liquid is 5.3m³/h, the specific heat of the liquid is 1.9kJ/ (kg. C), its density is 850kg/m³. The pipe diameter of the exchanger is $25×2.5mm., and the water flows in the tube-side. The individual heat transfer coefficients of the water-side and the liquid-side are 0.85kW/ (m². C) and 1.70kW/(m². C), respectively. The thermal conductivity km of the pipe is 45W/(m. C). Neglecting the scale resistance of pipe wall. If the outlet temperature of the water cannot be over 50°C, calculate the heat transfer surface area of the exchanger.<
2. In the counter flow heat exchanger, the water at 20°C is used to cool the liquid from 80°C to 30°C, and the volumetric flow rate of the liquid is 5.3m³/h, the specific heat of the liquid is 1.9kJ/ (kg. C), its density is 850kg/m³. The pipe diameter of the exchanger is $25×2.5mm., and the water flows in the tube-side. The individual heat transfer coefficients of the water-side and the liquid-side are 0.85kW/ (m². C) and 1.70kW/(m². C), respectively. The thermal conductivity km of the pipe is 45W/(m. C). Neglecting the scale resistance of pipe wall. If the outlet temperature of the water cannot be over 50°C, calculate the heat transfer surface area of the exchanger.<
Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
ChapterMA: Math Assessment
Section: Chapter Questions
Problem 1.1MA
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Transcribed Image Text:2. In the counter flow heat exchanger, the water at 20°C is used to cool the
liquid from 80°C to 30°C, and the volumetric flow rate of the liquid is
5.3m³/h, the specific heat of the liquid is 1.9kJ/ (kg. C), its density is
850kg/m³. The pipe diameter of the exchanger is $25×2.5mm., and the
water flows in the tube-side. The individual heat transfer coefficients of the
water-side and the liquid-side are 0.85kW/ (m².C) and 1.70kW/(m².
C), respectively. The thermal conductivity km of the pipe is 45W/(m. C).
Neglecting the scale resistance of pipe wall. If the outlet temperature of the
water cannot be over 50 °C, calculate the heat transfer surface area of the
exchanger.
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