Heating Ventilating and Air Conditioning: Analysis and Design
6th Edition
ISBN: 9780471470151
Author: Faye C. McQuiston, Jeffrey D. Spitler, Jerald D. Parker
Publisher: Wiley, John & Sons, Incorporated
expand_more
expand_more
format_list_bulleted
Concept explainers
Videos
Textbook Question
Chapter 1, Problem 1.11P
Compute the heat transferred from water as it flows through a heat exchanger at a steady rate of 1 m3/s. The decrease in temperature of the water is 5 C, and the mean bulk temperature is 60 C. Use SI units.
Expert Solution & Answer
Want to see the full answer?
Check out a sample textbook solution
Students have asked these similar questions
Pinch temperature at hot stream is 70C, while at cold stream is 60C
4. The following heat exchanger uses 10 kg/s of hot air to heat and boil liquid water into
saturated steam at 500 kPa.
(a) Find the steam flow (kg/s)
(b) Determine whether the process is allowed by the second law (Answer: It is not!)
(c) On the surface, the process looks OK as Tair>Twater at both the inlet and outlet. You
should be able to see the problem if you sketch the air and the water temperature
profiles as you move left to right through the exchanger. (Hints: The air will be essentially
a straight line, while the water will not. For the water, think about what happens when it
is changing phase.) This is called a pinch point violation, and it is a very important design
consideration in advanced combined cycle systems and in nuclear power plants.
Air
100 kPa
160°C
10 kg/s
Saturated Vapor
500 kPa
Air: 160°C
Steam: 151.8°C
Q
Air
100 kPa
30°C
Liquid Water
500 kPa, 20°C
Air: 30°C
Water: 20°C
2-) 10500 kg/hr of water is heated using a counter-flow, double-pipe heat exchanger utilizing
superheated steam. Steam passes through the heat exchanger at 130 °C after entering at 180 °C.
Water has an entrance temperature of 30 °C and an outlet temperature of 80 °C. Calculate the
heat transfer area if the overall heat transfer coefficient from steam to water is 814 W/m² K.
How much more area would there be if the fluid flow was parallel?
Chapter 1 Solutions
Heating Ventilating and Air Conditioning: Analysis and Design
Ch. 1 - Convert the following quantities from English to...Ch. 1 - Convert the following quantities from SI to...Ch. 1 - A pump develops a total head of 50 ft of water...Ch. 1 - A fan is observed to operate with a pressure...Ch. 1 - The electric utility rate for a facility during...Ch. 1 - For the business whose monthly electrical energy...Ch. 1 - Detmine the interest rate at which the project in...Ch. 1 - How much could a company afford to spend on an...Ch. 1 - Make the following volume and mass flow rate...Ch. 1 - A room with dimensions of 31020m is estimated to...
Ch. 1 - Compute the heat transferred from water as it...Ch. 1 - Air enters a heat exchanger at a rate of 5000...Ch. 1 - Water flowing at a rate of 1.5 kg/s through a heat...Ch. 1 - Air at a mean temperature of 50 F flows over a...Ch. 1 - Repeat Problem 1-10 for air at 10 C, a tube with...Ch. 1 - Air at 1 atm and 76 F is flowing at the rate of...Ch. 1 - Air flowing at the rate of 1000 cfm and with a...Ch. 1 - A chiller is providing 5 tons of cooling to an air...Ch. 1 - Air is delivered to a room at 58 F and the same...Ch. 1 - A chiller is to pro;ide 12 tons of cooling to a...Ch. 1 - Air is being rnished to a 30-ft by 40-ft by 12-ft...Ch. 1 - If cold outside air at 20 F is leaking into a...Ch. 1 - A Btu-meter is a device that measures water flow...Ch. 1 - A heat pump uses a 100,000-gallon swimming pool as...Ch. 1 - A heat pump uses a 100,000-gallon swimming pooi as...
Additional Engineering Textbook Solutions
Find more solutions based on key concepts
The volumetric flow rate and discharge velocity of the air.
Introduction to Heat Transfer
(a) If the cone shown in Fig. 5.34 is made of pine wood with a specific weight of 30lb/ft3, will it be stable i...
Applied Fluid Mechanics (7th Edition)
Determine the friction force at the surface of contact. Prob. P81
INTERNATIONAL EDITION---Engineering Mechanics: Statics, 14th edition (SI unit)
What parts are included in the vehicle chassis?
Automotive Technology: Principles, Diagnosis, And Service (6th Edition) (halderman Automotive Series)
An F-4 aircraft makes a high-speed pass over an airfield on a day when T = 35°C. The aircraft flies at M = 1.4 ...
Fox and McDonald's Introduction to Fluid Mechanics
Determine the maximum force P that can be applied without causing the two 50-kg crates to move. The coefficient...
Engineering Mechanics: Statics
Knowledge Booster
Learn more about
Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, mechanical-engineering and related others by exploring similar questions and additional content below.Similar questions
- As a process engineer, you are given the task to design a heat exchanger to cool a tank for mixing water and sulfuric acid. Based on the data below, calculate the rate of heat transfer needed to maintain the temperature at 300 K for mixing the following two streams (stream 1 mixed with stream 2). Stream 1: A solution of 25 wt.% sulfuric acid at 300 K flowing at 2 kg/s Stream 2: A solution of 40 wt.% sulfuric acid at 350 K flowing at 1 kg/s Copyright e Meiraw- Education. Permission reguired for reproducton or dapiay 300 200 100 350 K -100 300 K -200 -300 250 -400 -500 10 20 30 40 50 60 Wt. % H,SO, 70 80 90 100 H/kJ (kg solution)arrow_forwardSolve it all.arrow_forwardMechanical engineering : Heat transfer 1. Determine the overall heat transfer coefficient and flow rate required while using a heat exchanger , the water is enetered at 20◦C through the tubes of small single pass and the water comes out with a temperature at 40◦C. 25 kg/min of steam condenses at 60◦C on the shel side ,the area of the exchanger is 12 m2. (The latentheat, hfg, is 2358.7 kJ/kg at 60◦C.) 2 . You have unpainted aluminum siding on your house and the engineerhas based a heat loss calculation on U = 5 W/m2K. You discover thatair pollution levels are such that Rf is 0.0005 m2K/W on the siding.Should the engineer redesign the siding? If not sure skip, wrong may downvotearrow_forward
- Table Q3 is given to collect the temperature of hot and cold water at the inlet and outlet positions in the laboratory using Tube Heat Exchanger (TD360a) by varying the cold-water flow rate to investigate the effect of cold-water flow rate on the heat exchanger’s performance. (a) Complete all the output parameters indicated in the table given in Appendix 1. (b) Draw the temperature (TH1, TH2, TC1 and TC2) on the vertical vs position (1, 2) on the horizontal axis for each flow and discuss the effect of cold water flow rate change on the exit temperature of both cold water and hot water. (c) Draw the graph of Energy Balance Coefficient and Mean Temperature Efficiency on vertical axis and cold-water flow rate on horizontal axis. Discuss the effect of flow rate on the Energy Balance Coefficient and Mean Temperature Efficiency based on your finding.arrow_forwardQ1] A shell and tube heat exchanger is used to heat water (C = 4236 J/kg. °C) from 80°C to 150°C at a rate of 12.5 kg/s by hot gas that enters the exchanger at 350°C with a rate of 20.36 kg/s. The overall heat transfer coefficient is 290 W/m² °C. The gas making 2-shell passes and the water making 4-tube passes. Calculate the heat transfer surface area (Cp (gas) = 1.04 kJ/kg.°C). heat flux: (a) byarrow_forwardA shell-and-tube heat exchanger is used to cool compressed liquid methanol from 176 °F to 104 °F. The methanol flows on the shell side of the exchanger. The coolant is water that rises in temperature from 50 °F to 86 °F and flows within the tubes at a rate of 68.9 kg s1. Finding the appropriate thermophysical data and applying the proper equations, you are required to do the following: (a) Calculate i) methanol mass flow rate in the exchanger, ii) methanol volumetric flowrate at the inlet of the exchanger. (b) i) For the counter-current flow of the fluids calculate the log temperature difference, ii) explain the purpose of calculating this difference, iii) explain, quantitatively, why is the counter-current flow in heat exchangers preferred to co-current flow. meanarrow_forward
- 6. A heat exchanger was installed purposely to cool 0.50 kg of gas per second. Molecular weight is 28 and k=1.32. The gas is cooled from 150 deg C to 80 deg C. Water is available at the rate of 0.30 kg/s and at a temperature of 12 deg C. Calculate the exit temperature of the water.arrow_forward3.21 You must cool 78 kg/min of a 60%-by-mass mixture of glycerin in wa- ter from 108°C to 50°C using cooling water available at 7°C. Design a one-shell-pass, two-tube-pass heat exchanger if U = 637 W/m²K. Which side should the water flow through? Explain any design decision you make and report the area, TH₂0out and any other relevant features.arrow_forwardMilk is flowing through a heat exchanger at a rate of 2000 kg/h. The heat exchanger supplies 111,600 kJ/h. The outlet temperature of the product is 95℃. Determine the inlet temperature of the milk. The product specific heat is 3.9kJ/(kg℃). Show PBD and complete solution.arrow_forward
- Liquid food is heated in a tubular heat exchanger. The inner pipe wall temperature is 110 ° C. The internal diameter of the pipe is 35 mm. Product flows at 0.5 kg / s. If the initial temperature of the product is 7 ° C, calculate the convective heat transfer coefficient. The thermal properties of the product are as follows: specific heat = 3.7 kJ / (kg ° C), thermal conductivity = 0.6 W / (m ° C), product viscosity = 500 x 10-6 Pa s, density = 1000 kg / m³ , the product viscosity at 110 ° C = 410 x 10-6 Pa s. a. Find Reynold's number = b. Find the number Prantl = c. Find the Nuselt number = d. Convection coefficient =....... W/m² °Carrow_forward3. A heat exchanger has an overall coefficient of heat transfer of 0.5 kW/m².⁰C. Heat loss is 11 kW and the mean temperature difference is 15°C. What is the heat transfer area in ft²?arrow_forward3.34 A flow rate of 1.4 kg/s of water enters the tubes of a two-shell-pass, four-tube-pass heat exchanger at 7°C. A flow rate of 0.6 kg/s of liquid ammonia at 100°C is to be cooled to 30°C on the shell side; U = 573 W/m²K. (a) How large must the heat exchanger be? (b) How large must it be if, after some months, a fouling factor of 0.0015 m²K/W is expected to build up in the tubes but we still want to deliver ammonia at 30°C? (c) If we make it large enough to accommodate fouling, to what temperature will it cool the ammonia when it is new? (d) At what temperature does water leave the new, enlarged exchanger? [(d) TH₂0 = 49.9°C.]arrow_forward
arrow_back_ios
SEE MORE QUESTIONS
arrow_forward_ios
Recommended textbooks for you
Principles of Heat Transfer (Activate Learning wi...Mechanical EngineeringISBN:9781305387102Author:Kreith, Frank; Manglik, Raj M.Publisher:Cengage Learning
Principles of Heat Transfer (Activate Learning wi...
Mechanical Engineering
ISBN:9781305387102
Author:Kreith, Frank; Manglik, Raj M.
Publisher:Cengage Learning
How Shell and Tube Heat Exchangers Work (Engineering); Author: saVRee;https://www.youtube.com/watch?v=OyQ3SaU4KKU;License: Standard Youtube License