what is the relationship between cold stream volume flow rate and hot stream heat transfer rate for a heat exchanger? is it approximately linear? Could you provide a theoretical proof for that？
Conditions:
1. Cp for hot and cold fliuds are the same.
2. There is heat loss/gain from environment.
Homework Answers
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what is the relationship between cold stream volume flow rate
and hot stream heat transfer rate...
Hot water flows thorough a parallel flow heat exchanger at a rate of 10 kg/min and...
Hot water flows thorough a parallel flow heat exchanger at a rate of 10 kg/min and is cooled by a cold water stream of flow rate 25 kg/min. The inlet temperatures of hot and cold water streams are 70 oC and 25 oC, respectively. The outlet temperature of the hot water is expected to be 50 oC. The individual convective heat transfer coefficient on both sides of the heat transfer area is 600 W/m2 .K. Take the specific heat for...
Question 3 A counter flow single pass double pipe heat exchanger is supplied with hot water...
Question 3 A counter flow single pass double pipe heat exchanger is supplied with hot water at 120°C that is to be cooled by water entering at 20°C. The mass flow rate of the hot stream is 5 kg/s, and that of the cold stream is 6 kg/s. The specific heat capacity of both fluids may be taken as 4180 J/kg.K. The overall U value is 1500W/m2.K, and the surface area for heat transfer is 20 m2 a) Determine the...
Hot and cold water streams exchange heat in a double pipe heat exchanger in counter current...
Hot and cold water streams exchange heat in a double pipe heat exchanger in counter current flow. The pipes are 3 ft long. The inside pipe is a 5/8 inch BWG 12 copper tube. The outside pipe is a 1 inch Sch 40 steel pipe. The outside pipe is insulated to minimize heat loss to the surroundings. The hot water enters the inside tube at 180F with a flow rate such that Re = 10000 The cold water flows through...
A counter-flow heat exchanger is stated to have an overall heat transfer coefficient of 284 W/m2.K...
A counter-flow heat exchanger is stated to have an overall heat transfer coefficient of 284 W/m2.K when operating at design and clean conditions. Hot fluid enters the tube side at 101°C and exits at 71°C, while cold fluid enters the shell side at 27°C and exits at 42°C. After a period of use, built-up scale in the heat exchanger gives a fouling factor of 0.0004 m2 K/W. The surface area is 93 m². Assume both hot and cold fluids have...
11.20 Heat exchanger of counter flow arrangement with temperatures at inlet of hot and cold fluids...
11.20 Heat exchanger of counter flow arrangement with temperatures at inlet of hot and cold fluids are (200°C) and (60°C) gave outlet temperature of (110°C) for both sides as the surfaces were clean. After long time of use for same the inlet temperatures and flow rate, the hot fluid outlet was (130°C). Find the change in the overall heat transfer coefficient and the heat transfer values by percentage. Ans.: -37.4%, -22.2% 11.21 A liquid with a specific heat of (3200J/kg....
Problem 2: Heat exchanger (25 points) Cold water (op 4179 J/kg K) enters the tubes of a heat exchanger at 20 °C at a rate of 3 kgs. while hot oil (cp 2200 J/kg.K) enters the shell at 130 C at the sam...
Problem 2: Heat exchanger (25 points) Cold water (op 4179 J/kg K) enters the tubes of a heat exchanger at 20 °C at a rate of 3 kgs. while hot oil (cp 2200 J/kg.K) enters the shell at 130 C at the same mass flow rate and leaves at 60°C The heat exchanger consistsoftwo shells and 20 tubes, each executing four passes (two passes per shell). If the W/m2-K, assume the tube wall is very thin with convective heat transfer...
QUESTION 4 (25 marks) Water (Cr 4.208 kJ/kg.K) at flow rate of 5.11 kg/s s heated from 78°C to 98°C in an economize...
QUESTION 4 (25 marks) Water (Cr 4.208 kJ/kg.K) at flow rate of 5.11 kg/s s heated from 78°C to 98°C in an economizer inside a boiler. The boiler is a cross flow heat exchanger with single pass, shell fluid mixed and other fluid unmixed. The average water velocity in the 1.5 cm diameter (D) tube is 1.27 m/s. On the shell side, hot air (C,-1.0341 kJ/kgK) was used as the heating fluid with 7.3 kg/s of it entering the exchanger...
1 CPD4701 Assignment 2/2019 Question 2 shell and-tube heat exchanger was designed for the following service: Cold strea...
1 CPD4701 Assignment 2/2019 Question 2 shell and-tube heat exchanger was designed for the following service: Cold stream Hot stream Crude Oil Fluid Cooling water Tube side Stream allocation Shell side Mass flow rate (kg/s) 110 30 Inlet temperature (C) 90 Outlet temperature (C) Heat capacity (J/kg K) Density (kg/m2) Viscosity (Pa-s) Thermal conductivity (W/m-K) Fouling factor (m2 CW) 40 50 2177 4187 787 995 0.72-10 1.89-103 0.122 0.59 0.0002 0.0004 The shell and tube heat exchanger has the following...
1 CPD4701 Assignment 2/2019 Question 2 shell and-tube heat exchanger was designed for the following service: Cold strea...
1 CPD4701 Assignment 2/2019 Question 2 shell and-tube heat exchanger was designed for the following service: Cold stream Hot stream Crude Oil Fluid Cooling water Tube side Stream allocation Shell side Mass flow rate (kg/s) 110 30 Inlet temperature (C) 90 Outlet temperature (C) Heat capacity (J/kg K) Density (kg/m2) Viscosity (Pa-s) Thermal conductivity (W/m-K) Fouling factor (m2 CW) 40 50 2177 4187 787 995 0.72-10 1.89-103 0.122 0.59 0.0002 0.0004 The shell and tube heat exchanger has the following...
1. In a counterflow heat exchanger, the heat loss to the environment is to be included...
1. In a counterflow heat exchanger, the heat loss to the environment is to be included in the mathematical model. Considering the case of the hot fluid on the outside and the colder fluid on the inside, as shown in Figure below, sketch qualitatively the change that the inclusion of this consideration will have on the temperature distribution in the heat exchanger. Also, give the energy equation taking this loss into account. Hot Cold Energy loss 2. Experiments are carried...
Question 3 A counter flow single pass double pipe heat exchanger is supplied with hot water at 120°C that is to be cooled by water entering at 20°C. The mass flow rate of the hot stream is 5 kg/s, and that of the cold stream is 6 kg/s. The specific heat capacity of both fluids may be taken as 4180 J/kg.K. The overall U value is 1500W/m2.K, and the surface area for heat transfer is 20 m2 a) Determine the...
Hot and cold water streams exchange heat in a double pipe heat exchanger in counter current flow. The pipes are 3 ft long. The inside pipe is a 5/8 inch BWG 12 copper tube. The outside pipe is a 1 inch Sch 40 steel pipe. The outside pipe is insulated to minimize heat loss to the surroundings. The hot water enters the inside tube at 180F with a flow rate such that Re = 10000 The cold water flows through...
A counter-flow heat exchanger is stated to have an overall heat transfer coefficient of 284 W/m2.K when operating at design and clean conditions. Hot fluid enters the tube side at 101°C and exits at 71°C, while cold fluid enters the shell side at 27°C and exits at 42°C. After a period of use, built-up scale in the heat exchanger gives a fouling factor of 0.0004 m2 K/W. The surface area is 93 m². Assume both hot and cold fluids have...
11.20 Heat exchanger of counter flow arrangement with temperatures at inlet of hot and cold fluids are (200°C) and (60°C) gave outlet temperature of (110°C) for both sides as the surfaces were clean. After long time of use for same the inlet temperatures and flow rate, the hot fluid outlet was (130°C). Find the change in the overall heat transfer coefficient and the heat transfer values by percentage. Ans.: -37.4%, -22.2% 11.21 A liquid with a specific heat of (3200J/kg....
Problem 2: Heat exchanger (25 points) Cold water (op 4179 J/kg K) enters the tubes of a heat exchanger at 20 °C at a rate of 3 kgs. while hot oil (cp 2200 J/kg.K) enters the shell at 130 C at the same mass flow rate and leaves at 60°C The heat exchanger consistsoftwo shells and 20 tubes, each executing four passes (two passes per shell). If the W/m2-K, assume the tube wall is very thin with convective heat transfer...
QUESTION 4 (25 marks) Water (Cr 4.208 kJ/kg.K) at flow rate of 5.11 kg/s s heated from 78°C to 98°C in an economizer inside a boiler. The boiler is a cross flow heat exchanger with single pass, shell fluid mixed and other fluid unmixed. The average water velocity in the 1.5 cm diameter (D) tube is 1.27 m/s. On the shell side, hot air (C,-1.0341 kJ/kgK) was used as the heating fluid with 7.3 kg/s of it entering the exchanger...
1 CPD4701 Assignment 2/2019 Question 2 shell and-tube heat exchanger was designed for the following service: Cold stream Hot stream Crude Oil Fluid Cooling water Tube side Stream allocation Shell side Mass flow rate (kg/s) 110 30 Inlet temperature (C) 90 Outlet temperature (C) Heat capacity (J/kg K) Density (kg/m2) Viscosity (Pa-s) Thermal conductivity (W/m-K) Fouling factor (m2 CW) 40 50 2177 4187 787 995 0.72-10 1.89-103 0.122 0.59 0.0002 0.0004 The shell and tube heat exchanger has the following...
1 CPD4701 Assignment 2/2019 Question 2 shell and-tube heat exchanger was designed for the following service: Cold stream Hot stream Crude Oil Fluid Cooling water Tube side Stream allocation Shell side Mass flow rate (kg/s) 110 30 Inlet temperature (C) 90 Outlet temperature (C) Heat capacity (J/kg K) Density (kg/m2) Viscosity (Pa-s) Thermal conductivity (W/m-K) Fouling factor (m2 CW) 40 50 2177 4187 787 995 0.72-10 1.89-103 0.122 0.59 0.0002 0.0004 The shell and tube heat exchanger has the following...
1. In a counterflow heat exchanger, the heat loss to the environment is to be included in the mathematical model. Considering the case of the hot fluid on the outside and the colder fluid on the inside, as shown in Figure below, sketch qualitatively the change that the inclusion of this consideration will have on the temperature distribution in the heat exchanger. Also, give the energy equation taking this loss into account. Hot Cold Energy loss 2. Experiments are carried...
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