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The Unit Operations Laboratory consists of a Continuous Distillation pilot-plant (Figure 1). The plant is mainly composed of a mash-packing column, pre-heater with electrical resistor, a condenser, feed pump and a double-pipe heat exchanger. The pre-heater is used to heat up the raw material that is fed into the column on a continuous basis. The pre-heating system has not been used since the beginning of lockdown (March 2020). This often has detrimental effects on the performance of the pre-heater. You are required to perform a pre-liminary design study to investigate the extent of loss on the performance. The resister is operated to release 38.3% of its maximum capacity (W) and is used to heat the water to a state of saturated steam at a vapour pressure of 2500 dyn/cm². Pre-Heater AU 2. 8. o M v O 10-3 99 OOO L e: Figure 1. P&ID diagram for a Continuous Distillation pilot-plant. a) Determine the surface (wall) temperature (°C) of the heating resistor using Fig. 2 [Hint: A = ndh + d² b) Estimate the boiling heat transfer coefficient, in W/m². K and determine the percentage reduction if the initial coefficient was 63 000 W/m². K.

The Unit Operations Laboratory consists of a Continuous Distillation pilot-plant (Figure 1). The plant is mainly composed of a mash-packing column, pre-heater with electrical resistor, a condenser, feed pump and a double-pipe heat exchanger. The pre-heater is used to heat up the raw material that is fed into the column on a continuous basis. The pre-heating system has not been used since the beginning of lockdown (March 2020). This often has detrimental effects on the performance of the pre-heater. You are required to perform a pre-liminary design study to investigate the extent of loss on the performance. The resister is operated to release 38.3% of its maximum capacity (W) and is used to heat the water to a state of saturated steam at a vapour pressure of 2500 dyn/cm². Pre-Heater AU 2. 8. o M v O 10-3 99 OOO L e: Figure 1. P&ID diagram for a Continuous Distillation pilot-plant. a) Determine the surface (wall) temperature (°C) of the heating resistor using Fig. 2 [Hint: A = ndh + d² b) Estimate the boiling heat transfer coefficient, in W/m². K and determine the percentage reduction if the initial coefficient was 63 000 W/m². K.

Elements Of Electromagnetics
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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DESIGN OF A DOUBLE-PIPE HEAT EXCHANGER The Unit Operations Laboratory consists of a Continuous Distillation pilot-plant (Figure 1). The plant is mainly composed of a mash-packing column, pre-heater with electrical resistor, a condenser, feed pump and a double-pipe heat exchanger. The pre-heater is used to heat up the raw material that is fed into the column on a continuous basis. The pre-heating system has not been used since the beginning of lockdown (March 2020). This often has detrimental effects on the performance of the pre-heater. You are required to perfom a pre-liminary design study to investigate the extent of loss on the performance. The resister is operated to release 38.3% of its maximum capacity (W) and is used to heat the water to a state of saturated steam at a vapour pressure of 2500 dyn/cm?. 오오 Pre-Heater Loo Figure 1. P&ID diagram for a Continuous Distillation pilot-plant. a) Determine the surface (wall) temperature (°C) of the heating resistor using Fig. 2 [Hint: A = ndh + b) Estimate the boiling heat transfer coefficient, in W/m2. K and detemine the percentage reduction if the initial coefficient was 63 000 W/m2. K. c) Assuming the air conditiong system at the lab is switched on and the room temperature is maintined at 53.6°F and the thickness of the pre-heater (glass window) is 2 cm. Estimate the heat lost (kW/m²) to the surroundings if the convective coefficient of air is 9852 W/m?. K. d) Calculate the ammount of heat absorbed (W/m²) by the water in the pre-heater.
Transcribed Image Text:DESIGN OF A DOUBLE-PIPE HEAT EXCHANGER The Unit Operations Laboratory consists of a Continuous Distillation pilot-plant (Figure 1). The plant is mainly composed of a mash-packing column, pre-heater with electrical resistor, a condenser, feed pump and a double-pipe heat exchanger. The pre-heater is used to heat up the raw material that is fed into the column on a continuous basis. The pre-heating system has not been used since the beginning of lockdown (March 2020). This often has detrimental effects on the performance of the pre-heater. You are required to perfom a pre-liminary design study to investigate the extent of loss on the performance. The resister is operated to release 38.3% of its maximum capacity (W) and is used to heat the water to a state of saturated steam at a vapour pressure of 2500 dyn/cm?. 오오 Pre-Heater Loo Figure 1. P&ID diagram for a Continuous Distillation pilot-plant. a) Determine the surface (wall) temperature (°C) of the heating resistor using Fig. 2 [Hint: A = ndh + b) Estimate the boiling heat transfer coefficient, in W/m2. K and detemine the percentage reduction if the initial coefficient was 63 000 W/m2. K. c) Assuming the air conditiong system at the lab is switched on and the room temperature is maintined at 53.6°F and the thickness of the pre-heater (glass window) is 2 cm. Estimate the heat lost (kW/m²) to the surroundings if the convective coefficient of air is 9852 W/m?. K. d) Calculate the ammount of heat absorbed (W/m²) by the water in the pre-heater.
Region I Region II Maximum Region IV | critical) heat | flux. Film Nucleate boiling to Transition boiling boiling Natural convection 10 Minimum boiling Slugs and heat flux,4 Di min to columns- Isolated Region II bubbles 10 10 30 100 320 1000 AT=T,-T. (C) Figure 2. Boiling mechanisms for water. Table 1. Heating Resistor Features. Features and Benefits Power rating of 17.0608 Btu/min • Diameter of 10 mm Length of 65 mm Quartz resistance wire for maximum heater life • TIG-welded end disc prevents contamination and moisture absorption Fibreglass lead wire insulation • Complies with Electrostatic Control Standards ANSI/ESD S20.20:2014 and BS EN 61340-5- 1:2007 ROHS compliant on restricted hazardous substances 4 (W/m)
Transcribed Image Text:Region I Region II Maximum Region IV | critical) heat | flux. Film Nucleate boiling to Transition boiling boiling Natural convection 10 Minimum boiling Slugs and heat flux,4 Di min to columns- Isolated Region II bubbles 10 10 30 100 320 1000 AT=T,-T. (C) Figure 2. Boiling mechanisms for water. Table 1. Heating Resistor Features. Features and Benefits Power rating of 17.0608 Btu/min • Diameter of 10 mm Length of 65 mm Quartz resistance wire for maximum heater life • TIG-welded end disc prevents contamination and moisture absorption Fibreglass lead wire insulation • Complies with Electrostatic Control Standards ANSI/ESD S20.20:2014 and BS EN 61340-5- 1:2007 ROHS compliant on restricted hazardous substances 4 (W/m)
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