Principles of Heat Transfer (Activate Learning with these NEW titles from Engineering!)
8th Edition
ISBN: 9781305387102
Author: Kreith, Frank; Manglik, Raj M.
Publisher: Cengage Learning
expand_more
expand_more
format_list_bulleted
Videos
Question
error_outline
This textbook solution is under construction.
Students have asked these similar questions
1. You are involved in an industry to find solution of the following situation: In the process to
disinfect water by using chlorine gas, it is important to produce the gas within the company plant
location. The process that is used to produce chlorine gas involves the electrolysis of NaCl to
produce chlorine gas at the anode and hydrogen gas at the cathode, then the chlorine gas is used
to disinfect the water while the hydrogen gas is vented to the atmosphere. The rate of hydrogen
production is 10 m'/day, the calorific value of H, is 130000 kJ/kg, p-0.09 g/L.
You are involved in investigating two alternatives:
I. Hydrogen is collected, introduced to hydrogen engine to produce work. Then this work
is used to produce electricity.
II. Hydrogen is stored and used directly to produce electricity by hydrogen fuel cell
(a) Calculate the efficiency of the first alternative (conversion of heat to work) for energy
absorption at the combustion temperature of 500 "C and energy rejection to the…
You are charged with specifying a cooling system for a house. The solar and
internal gains have been calculated already, but you need to increase its
capacity to account for ventilation. The ventilation system will constantly
exhaust 200 cubic feet per minute (CFM) of stale air and replace it with 200
21
CFM of fresh air. On a design day, the outdoor air is 90°F dry bulb temperature
and 73°F wet bulb temperature. Indoor air is expected to resolve to "standard
21
air" at 75°F and 50% relative humidity (%RH). What is the additional amount
of coolir
acity required to account for the ventilation system? Your
answer should be in Btu/h.
Answer:
An electric hot water heater consumes 3.1 kilowatts of electricity and converts it to heat. How long will it take the water heater to heat a 67 gallon tank of water from 10 degrees Celsius to 50 degrees Celsius? (1 kilogram of water is 0.37 gallons, 1 Calorie = 4200 J). It may be helpful to refer back to the weekly handout for guidance on this problem.
Your final answer should be in minutes (rounded to the nearest 10 minutes).
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
- XYZ Company Ltd has consulted your firm Zig-Zag Energy over an intention to generate electricity in Ghana. Being the senior project engineer for Zig-Zag Energy, management has asked you to prepare a detailed technical report in respect to the project. a) Discuss the major factors to take into consideration when consulting on such projects. A tank containing air is stirred by a paddle wheel. The work input to the paddle wheels is 2000KJ and the heat transferred to the surrounding from the tank is 6000KJ. b) Determine the change in the internal energy of the system There has been a sharp differences between the board of Blue-Blue Energy over which of the energy sources (hydroelectric power plant-HEP and Coal fired plant) is best for power generation. As an energy expert, you were confronted by the debating faction for your opinion. You…arrow_forwardcalculations. A common room at a facility is used by personnel for food consumption and resting (Fig. 2). An air conditioning system is required for providing comfortable temperature of 23°C. You are asked to select the room dimensions (X= 10m, Y=2.4m and Z= 15m) and design a split air conditioning system suitable to meet the requirements for climatic conditions of a humid subtropical climate with long-term annual average high temperature of 26.4°C and minimum low of 16°C. The room can accommodate up to 6 - 12 staff members. The following kitchen appliances are used in the room: coffee machine, 2 microwaves, cooktop and dishwasher. S E COFFEE 128 O FFEE FIGURE 2. Common room layout Z X COFFEE Yarrow_forward. You are involved in an industry to find solution of the following situation: In the process to disinfect water by using chlorine gas, it is important to produce the gas within the company plant location. The process that is used to produce chlorine gas involves the electrolysis of NaCl to produce chlorine gas at the anode and hydrogen gas at the cathode, then the chlorine gas is used to disinfect the water while the hydrogen gas is vented to the atmosphere. The rate of hydrogen production is 10 m3/day, the calorific value of H2 is 130000 kJ/kg, ρ=0.09 g/L. You are involved in investigating two alternatives:I. Hydrogen is collected, introduced to hydrogen engine to produce work. Then this work is used to produce electricity.II. Hydrogen is stored and used directly to produce electricity by hydrogen fuel cell (a) Calculate the efficiency of the first alternative (conversion of heat to work) for energy absorption at the combustion temperature of 500 oC and energy rejection to the cold…arrow_forward
- Goal Solve for the efficiency of a heat engine using a five-step process the includes:1. Making a state table.2. Making a process table.3. Calculating the totals for Work, Heat, and Internal-Energy-Change.4. Identifying the heat input (hot reservoir) and output (cold reservoir).5. Calculating the efficiency of the engine.Problem Shown in the figure to the right is a cyclic process undergone by a heat engine. Your heat engine shall use 7.0 moles of nitrogen gas (diatomic). During the process a->b, the pressure rises by a factor of 2.0. solution- (1) Fill in the State Table (all pressures in Pascals, all volumes in cubic meters, all temperatures in K). Pressure Volume Temperature a b c (2) Fill in the Process Table (all entries in Joules). Work Heat dU a->b b->c c->a (3) Find the Totals: Work = J Heat = J dU = J (4) Find the heat input (from "hot reservoir") and the heat output (to…arrow_forwardIn a concentrated solar power plant, molten salt tank is used to store the thermal energy from the sun during the day. The tank wall thickness is 3cm containing molten salt at a temperature of 390 degree Celsius. There is atmospheric air outside the tank at a temperature of 30 degree Celsius. Suppose heat is lost as a result of heat transfer from the molten salt to the atmospheric air. What is the mode of heat transfer in this condition? conduction then convection convection then conduction convection then conduction then convection conduction then convection then conductionarrow_forwardIn steady state condition, the lateral surfaces of the plate are insulated, and the bottom surface is heated with a uniform heat flux. The thermal conductivity coefficient of the plate is k, and its upper surface is cooled by convection. a) Find the temperature distribution inside the plate. b) Find the temperatures at x = 0 and x = L. c) Find the amount of heat transfer transferred. NOTE: Assume one-dimensional heat conduction. "ID" is the last two digits of your student number (For example, if your student number is 2028151001, your ID-01. So, you must multiply the related term with 1). h = 27 W / m?.°C q% = 19500 * ID W/m2 k =15 W/ m.°C T = 22 °C L =8* ID cm h, T X 9% (W/m²)arrow_forward
- Task 1 You are a student at the HTU University, the instructor of the fundamental of thermodynamic course asked you to explain the fundamentals of thermodynamic systems to Grade 10 school students to help them visualize the importance of thermodynamics in their life starting from their car engine and moving to the different appliance that they use in their home, discuss the following with school students: Q1. What does thermodynamics mean and represent? Give examples from your daily life. Q2. What is a thermodynamic property? What is the difference between intensive and extensive properties. Why the density is an intensive property; it is dependent on mass and volume which are extensive properties, right?. Q3. What is the difference between energy and heat transfer? Give examples on both. Q4. What does the first law of thermodynamics state? Give two examples on the first law of thermodynamics from your daily life. Q5. Write down the equation of energy balance for closed, open, and…arrow_forward4. For each of the situations in trie lapie welow, state the process by which heat is transferred. Getting burnt by touching a hot stove Hot air rising, cooling and falling Heat from a campfire when you are seated beside it Ice cooling down your hand Heat from the Sun warming your face Boiling water by thrusting a red-hot piece of iron into it A slice of bread placed undera red-hot electric grill to make toast Heating a tin can of water using a Bunsen burnerarrow_forwardA system is being designed to remove heat from a server rack in a data center. The figure below provides a schematic of this system. A pump circulates water through a heat sink in the rack to remove 5000 W of heat. To keep the electronics below the temperature at which damage may occur, the water leaving the server rack will be limited to 80 °C. That temperature will result in the most optimal system, so you can assume that it is the temperature of the water leaving the server rack. This water is then circulated to a heat exchanger that can be modeled as a counter flow model with a stream of air to remove the heat. Air with an inlet temperature of 20 C at a mass flow rate of 0.1 kg/s is blown through this heat exchanger. Your task is to determine the size of the air-to-water heat exchanger (i.e., its area) and the mass flow rate of water to minimize the life cycle cost of the system. The cost, which is dominated by the first cost of the heat exchanger and the energy to run the pump,…arrow_forward
- Please provide equations that you are using so I can follow along and learn how to do this. In Jamestown, NY, a coal power plan consumes coal at a rate of 80 tons/hr. When coal burns, it generates approximately 30,000 kJ for every kg of coal burned. The cooling course for the plant is the nearby Chadakoin River nearby and, by code, the power plant cannot reject more than 13.19 x 109 MJ into the river annually. Determine the maximum average power output of this plant and it's maximum thermal efficiency. To check your work, enter the efficiency, as a decimal, in the box provided.arrow_forwardPart 1: Do the Analysis of the Ocean Thermal Gradient Power Plant shown below. Your Analysis will be easier to do in EES but it is up to you. Your EES program must be well documented and documentation in your code should reference system sketches. (The cycle and individual components) These sketches are done on attached engineering or typing paper, unless you are able to draw them in EES. You must validate your results with hand calculations on engineering paper that invoke the 1 and 2 Law from the perspective of the entire cycle, not the individual components. Of course, a system sketch is required. nd 1. An ocean thermal gradient power plant using a simple non-ideal Rankine Cycle operates with a peak boiler temperature of 70 °F and a condenser temperature of 40 °F. The warm surface water of the ocean is supplying the thermal energy to the boiler. Assume a high source temperature of 80 °F. The cooler water deeper in the ocean is the sink for heat rejection at the condenser. Assume a…arrow_forwardProblem 1: You are working in a consulting company that does a lot of hand calculations for designs in Aerospace Industry for mechanical, thermal, and fluidic systems. You took the Virtual engineering course, and you want to convince your boss and the team you work to move to modelling and simulation in computers using a certain software (Ansys, Abaqus, etc). Discuss the benefits and pitfalls of computer based models used within an industrial environment to solve problems in engineering.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
Heat Transfer – Conduction, Convection and Radiation; Author: NG Science;https://www.youtube.com/watch?v=Me60Ti0E_rY;License: Standard youtube license