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Pennsylvania State University *
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Mechanical Engineering
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Apr 3, 2024
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EGEE 101H, Homework #2 –
Unit Conversions and Efficiency February 12, 2013 Due on Tuesday, February 19 by electronic submission to the HW2 drop box, by 11:59 p.m. 1.
Assume that you have graduated from Penn State, found a good job and secured a low-
interest mortgage loan to build your dream house in Pittsburgh. You need a heating system which would provide 125,000,000 Btu of heat per year during the heating season. Below are some options with fuel costs. Which option would you choose, if you want to minimize your energy bill? Calculate the total fuel cost of each option to support your decision. Tabulate your results using the table below. 30 pts
a) burn coal: Heating Value: 25,000,000 Btu/ton, Heating Efficiency: 0.55, Cost: $65 per ton. (125,000,000Btu)* (1Ton/25,000,000Btu)*($65/1Ton)= TC of using coal if 100% efficient $325= TC of using coal if 100% efficient $325*(1/.55)= Actual cost of heating your house with coal $590.91= Actual cost of heating your house with coal b) burn fuel oil Heating value: 140,000 Btu/gallon, Heating Efficiency: 0.65, Cost: $4 per gallon. (125,000,000Btu)*(1Gallon/140,000 Btu)*($4/1 Gallon)= TC of using fuel oil if 100% efficient $3571.43= TC of using fuel oil if 100% efficient $3571.43*(1/.65)= Actual cost of heating your house with fuel oil $5494.51= Actual cost of heating your house with fuel oil c) burn natural gas: Heating Value: 1,000 Btu/cu ft, Heating Efficiency: 0.80, Cost: $2.5/1,000 cu ft. (125,000,000Btu)*(1cu ft/1000Btu)*($2.5/1000cu ft)= TC of using natural gas if 100% efficient $312.5=TC of using natural gas if 100% efficient $312.5*(1/.8)= Actual cost of heating your house with natural gas $390.63= Actual cost of heating your house with natural gas c) Again Burn natural gas at an updated price http://www.eia.gov/dnav/ng/hist/n3010us3m.htm Heating Value: 1,000 Btu/cu ft, Heating Efficiency: 0.80, Cost: $9.97/1,000 cu ft. (125,000,000Btu)*(1cu ft/1000btu)*($9.97/1000cu ft)= TC of using natural gas if 100% efficient TC of using natural gas if 100% efficient =$1246 1246*(1/.8)= Actual cost of heating your house with natural gas $1557.5= Actual cost of heating your house with natural gas
d) use electricity: Conversion Factor: 1 kWh = 3412 Btu, Heating Efficiency: 1.0, Cost: $90/1,000 kWh (125,000,000Btu)*(1kWh/3412)*($90/1000kWh)= AC of heating your house with electricity $3297.19 = Actual Cost of heating your house with electricity System Amount of Fuel Unit Cost Total Cost, $ Coal Stove 9.09 tons $65/ton $590.91 Oil Furnace 1373.63 gallons $4/gallon $5494.51 Gas Furnace 156.252 x1,000 cu ft $2.5 or 9.97 /1,000 cu ft $390.63 or $1557.5 Electric Heat 36.636x1,000 kWh $90/1,000 kWh $3297.19 Note
: Don't forget to include heating efficiencies in your calculations. Remember, when you include efficiency, you will need more heat from the fuels (as input) than the required output (i.e., 125,000,000 Btu). I would choose to heat my house with Natural Gas (if I could get it at 2.5/1,000 cu ft, but not at 9.97/1,000 cu ft) or Coal because it is the least expensive option for my energy needs. 7.5 pts
for each correct answer.
2. What is the heating efficiency of an electric water heater, if you spend 0.11 kilowatt-
hour of electric energy to heat 2 lb. of water from 77 to 212 °F? (Hint: Remember the definition of Btu and 1 kWh = 3412 Btu.) 20 pts
Btu is the amount of energy needed to heat one pound of water by one degree Fahrenheit. (212-77)*2= Total Btu required to heat the water 270= Total Btu required to heat the water .11kWh(3412.14163Btu/1kWh)= total Btus used by the water heater 375.34= total Btus used by the water heater 270/375.34= Heating efficiency .7194= Heating efficiency 3. An inventor claims that he has developed a wonderful new heat engine that operates with a relatively cool flame at 150 °C and discharges waste heat to the environment at 20 °C. His promotional literature advertises that the first law efficiency of his device is 45%. Would you believe him? (Hint: Calculate the maximum efficiency possible for the engine and compare it with the claimed efficiency.) 20 pts *Temperature must be in kelvin*
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Related Questions
!
Required information
NOTE: This is a multi-part question. Once an answer is submitted, you will be unable to return to this part.
A Carnot heat pump is to be used to heat a house and maintain it at 25°C in winter. On a day when the average outdoor
temperature remains at about 2°C, the house is estimated to lose heat at a rate of 55,000 kJ/h. The heat pump consumes
5.15 kW of power while operating.
HP
25°C
2°C
55,000 kJ/h
How long did the heat pump run on that day?
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A house is heated and maintained at 20 °C by a heat pump.
Part A
Part B
Based on these results, would you recommend heat pumps at locations with a severe climate?
Match the words in the left column to the appropriate blankes in the sentences on the right.
Reset
Help
mild
1. Given that a real heat pump is significantly
efficient than a Carnot heat pump, the
increases
advantage of a heat pump over electric heating
rapidly when the outside temperature
becomes really low.
less
more
2. As the COP decreases, the heating power
decreases
3. A heat pump is ideal for a
climate.
severe
Submit
Request Answer
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7. In the summer it tends to become quite hot and humid in the Guelph area. Many home owners purchase dehumidifiers to remove
moisture from the air. Excessive moisture can create problems with dampness in basements, so it is a good idea to keep the
situation under control, Dehumidifiers work on the principle that when air is cooled, its ability to hold moisture decreases
Therefore, the dehumidifier consists of a cabinet-like structure containing a refrigeration coll. As the room air blows over this coil.
it is cooled to a temperature that is below its dew point. Moisture then condenses out of the air and is collected in a bucket (or
directed by a hose to a floor drain),
A curious home owner wonders how much water will be collected in a 12 hour period. He empties the bucket at the start of the
test and comes back exactly twelve hours later to see how much water has been collected.
Calculate the amount of water that would be collected in a twelve-hour period if 1.15 cubic metres per…
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QUESTION 4
1. This question is about the section titled, Airplanes. Which of the following statement is NOT true
according to this reading?
The design known as "winglets" was shown to reduce fuel use by 5%.
How an airplane operates with respect to taxi or take-off has an insignificant impact on the
airplane fuel use.
C
C
Jet biofuel is currently expensive and limited in supply.
The goal of the Carbon Offset and Reduction Scheme of International Aviation (CORSIA) is
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pt) You have two solar hot water collectors on the roof, each is 4 feet by 8 feet. Assume
the panels are 50% efficient. The panels receive about 300 BTU per hour per square
foot, for a total of 5 hours. You have a hot water tank connected to the panels filled with
600 pounds of water, starting in the morning at 60 deg F. What will the water
temperature be at the end of the 5 hours?
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Question 6
Compare the carbon emissions per MJ to heat household water using the following two
energy systems:
a) A 25% efficient coal-fired power plant delivering electricity to a 99% efficient
electric water heater. Assume LHV carbon intensity of coal is 25.8 gC/MJ.
b) A new 50% efficient natural gas-fired combined cycle power plant to a 99%
efficient electric water heater. You must calculate the LHV carbon intensity of
natural gas. Assume 100% methane and ideal conditions.
Assume 5% losses in electrical transmission lines and 90 MJ of fuel input to each system.
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Answer question 2 based on the results of question 1.
You have a natural gas furnace in your home that used 78,500 cubic feet of natural gas for heating last winter. Your neighbor has a furnace that burns heating oil, and used 516 gallons of heating oil last winter. You can convert the natural gas and heating oil consumption data into Btu to determine which home used more energy for heating.
Natural gas BTU: 1,028 Btu per cubic foot
Oil BTU: 138,590 Btu per gallon
Natural Gas BTU= 80698000 Btu
Oil BTU = 71512440 Btu
The home that used a natural gas furnace used more energy for heating.
2. You need a new furnace for your home, and you are comparing systems that use natural gas and heating oil. One factor to consider is the cost of fuel. You can compare the price of the fuels on an equal basis by dividing the price per unit of the fuels by the Btu content per unit of the fuels to get a price per million Btu.
Assume Natural gas price = $10.50 per thousand cubic…
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0
Required information
NOTE: This is a multi-part question. Once an answer is submitted, you will be unable to return to this part.
A Carnot heat pump is to be used to heat a house and maintain it at 25°C in winter. On a day when the average
outdoor temperature remains at about 2°C, the house is estimated to lose heat at a rate of 55,000 kJ/h. The heat
pump consumes 4.8 kW of power while operating.
55,000 kJ/h
Determine the total heating costs, assuming an average price of $0.11/kWh for electricity.
The total heating cost is $40.33
(You must provide an answer before moving to the next part.)
arrow_forward
Solve question 2 based on the answer of question 1.
You have a natural gas furnace in your home that used 78,500 cubic feet of natural gas for heating last winter. Your neighbor has a furnace that burns heating oil and used 516 gallons of heating oil last winter. You can convert the natural gas and heating oil consumption data into Btu to determine which home used more energy for heating.
Natural gas BTU: 1,028 Btu per cubic foot
Oil BTU: 138,590 Btu per gallon
Natural Gas BTU= 80,698,000
Oil BTU = 71,512,440
The home that used a natural gas furnace used more energy for heating.
2.- You need a new furnace for your home, and you are comparing systems that use natural gas and heating oil. One factor to consider is the cost of the fuel. You can compare the price of the fuels on an equal basis by dividing the price per unit of the fuels by the Btu content per unit of the fuels to get a price per million Btu.
Assume Natural gas price = $10.50 per thousand cubic…
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Questions:
1.
b.
As the power plant engineer, you are asked by the power plant manager to design a new steam-based power
plant with a net power output target of 200 MW with a thermal efficiency of 40%. Thermodynamics calculation
should be conducted for the known condition illustrated in Figure 1.
Boiler
P₁ =
8.0 MPa
Saturated
vapor
Condenser
Pump
Turbine
of Vapor and Gas]
Cooling
water
8.0 MPa
0.008 MPa
tw.
Saturated
liquid at 0.008 MPa
Figure 1. Illustration of steam turbine system and its T-S diagram
a. Calculate the back work ratio, the system's mass flow rate, and the cooling water's mass flow rate.
What kind of efforts should be conducted if the plant manager asks you to increase the system's efficiency
to 50% ? Explain and provide proof in the form of calculation!
VIOL
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Q1: a - An electric home stove with 3 burners and microwave is used in preparing a meal as
follows. Burner 1: 20 minutes Burner 2: 40 minutes Burner 3: 15 minutes . Microwave: 30
minutes. If cach burner is rated at 1.2 kW and the oven at 1.8 kW, and electricity costs 1000
(IQ =Iraqi Dinar) per kWh, calculate the cost of electricity used in preparing the meal? 4 marks
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An engineer was tasked with evaluating a heat and power generation unit for an aluminium
smelting plant. The management intends to expand the production facilities to meet growing
demand for aluminium. The plan involves increasing the energy intensive smelting line from the
present single line to three lines by end of 2022. To support the expansion plan, the company
plans to install a self-sufficient power generation unit. Details of the energy requirement and the
proposed power generation unit is given the following Table.
Item
Power requirement per smelting processing line 0.6 MW
Proposed power generation unit:
Supplier
• System
Description
Mitsubishi Heavy Industries Ltd
Steam power plant (Carnot heat engines
principles)
35%
• Overall thermal efficiency
Prepare a mini technical power evaluation report for the above project. Your report should include
the following items and in the following order:
a. Total power (W) and heat (Q) requirement.
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Good day. I am trying to review for examinations and require assistance for these questions...
Thermal Energy:
Find BTE and ITE using the BHP AND IHP that you have calculated for number 4 and number 5. Assume you have a gasoline that burns for 7 gal/hr with a heat value of 18000 BTU
Mechanical Efficiency:
Find the Mechanical Efficiency of an engine with a 6-cylinder engine which a bore of 6.28 inches and a stroke of 3.5 inches with an IMEP of 400 psi and BMEP of 300 psi at 1825 rpm.
Volumetric Efficiency:
What is the volumetric efficiency of a four-cylinder aircraft engine which has a bore of 4 inches and a length of stroke of 6 inches and 30 cu in. volume of charge
**Would appreciate a detailed explanation. Thank you so much.
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17. I need the Equations for the nozzle of gas turbine engine of an airplane. (Balance of energy and mass) everything
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1. Residual oil, with a heating value of 18,480 BTU/bm, is used as a fuel in a power plant which
produces 947,870 BTU/s of electricity. The overall efficiency of the power plant is 52
Determine the:
a. Heat input, in BTUs
b. Daily fuel consumption, in lbm
C. Dimensions of the cylindrical storage (assuming length is equal to the diameter), in ft.
d. Heat rejected the environment, in BTU/s.
The density of the oil is 62 ID/ft.
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3) When a person enters his house, which is completely closed in summer, he sees that the temperature is 34°C. After turning on the air conditioner, the temperature of the house becomes 22 °C within 15 minutes. Since the efficiency coefficient of the air conditioning system is 3.2,
a) the electrical power drawn by the system,
b) heat dissipated to the environment, and
c) Assuming that it works 8 hours a day and the electricity price is 0.6 TL per kWh, find its cost for 4 months. Assume that the entire mass inside the house is equivalent to 1000 kg of air. For air, take Cv = 0.73 kJ/kgK, Cp= 1.0051 kJ/kgK.
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Required information
Problem 07.025 - DEPENDENT MULTI-PART PROBLEM - ASSIGN ALL PARTS
NOTE: This is a multi-part question. Once an answer is submitted, you will be unable to return to this part.
Refrigerant-134a enters the coils of the evaporator of a refrigeration system as a saturated liquid-vapor mixture at a
pressure of 140 kPa. The refrigerant absorbs 200 kJ of heat from the cooled space, which is maintained at -10°C, and
leaves as saturated vapor at the same pressure.
Problem 07.025.c - Total entropy change of the process
Determine the total entropy change for this process.
The total entropy change for this process is
kJ/K.
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as an aerospace engineering student, where do you utilize flight simulators?
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b) Determine the energy transport rate for the system shown in Figure below.
Fuel flow
Top heat loss
Exhaust flow
Epuet15,000 Btu/min
Eethaut500, Btu/min
180,000 Btu/h
System
boundary
Engine-generator set
200. hp
Bottom heat loss
54,000 Btu/h
50.0 hp
Electrical workout
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Q2/A: What are the technologies that promote the sustainable energy?
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Fill the balks with the correct word/words
d-For turbulent flow, Reynold Number is
e- A
pump is a rotodynamic pump that converts mechanical energy
to hydraulic pressure energy.
f-
turbine can be used in rivers, man-made channels, tidal waters.
g- The First Law of Thermodynamic state that__
h-
i-
is a change in the system from one equilibrium state to another.
transfer heat from low to high temperature stages by using
mechanical work.
j- Adiabatic process means
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It takes 104 hours to install a heating system in an office building. Theinstallers have already worked 36 hours. How many more hours are neededto finish the installation?
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3. A heat engine operating between a geothermal steam source at 205°C and a riv-
er at 18°C achieves an efficiency of 22%. What percentage of its theoretical max-
imum efficiency is it achieving?
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LP
Available Courses Video Tutorials
us / Calamba-3rd Year Level
2nd Semester
55215 ME 3214
Principles of thermodynamics / Prelin
14 Combustion Engineering
A Carnot engine operates between temperature limits of 1200 °K and 400 °K and using 0.4 kg of air. The
pressure at the beginning of heat addition is 1500 kPaa and at the end of heat addition is 750 kPaa. Determine
the heat added
O a. 55.9 kJ/kg
O b. 95.5 kJ/kg
O C. 95.5 kJ
O d. 55.9 kJ
立
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Question 3
a) The details of travel time and capacity of different links in a portion of a city
road network is as given in Table 1. Assign a traffic volume of 15,000 pcu per hr
from node A to node I by multiple route assignment technique.
Table 1: Travel time and capacity
Link
Travel time in minutes
Practical capacity in
pcu/hr
A-B
6000
A-C
5000
A-D
5000
B-F
6000
C-E
5000
D-G
5000
E-H
5000
F-I
6000
G-H
5000
H-I
10000
wwNN
2
2
3
3
3
2
N33 N
2
2
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ASSIGNMENT
Issue Date: 14.12.2020
Date of submission: 21.12.2020
1. a) In a certain process, 675 J of heat is absorbed by a system while 290 J of work is done on the system.
What is the change in internal energy for the process? Determine also the net work done and change in
internal energy
if the processes are assumed to be
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7. A diesel electric plant supplies energy for Meralco. During the 24 hour period, the plantconsumed 200 gallons of fuel at 28 degree Celsius and produced 3930 KW-hr.Industrial fuel used is 28 degree API and was purchased at 5.50 php per liter at 15.6degree celsisu. What is the cost of the fuel be to produce 1 KW-hr?
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In company that designs road cars and heavy trucks, it important to make the proper selection of the engines.
Your part as a system energy engineer is to make a proper selection between an engine operates on Otto
cycle/gasoline engine or Diesel cycle/diesel engine. Your head of department asked you to provide a detailed
technical report that shows your selection for engine to be used with heavy truck vehicle. This is best
achieved by performing the following tasks:
Section.1:
1. Which engine does operate at lower rpm and has higher air-fuel mass ratio?
2. Which engine does burn fuel more completely?
3. Which engine has lower fuel cost?
4. Explain what compression ratio for Otto and Diesel cycles means
5. Explain what cut-off ratio for Diesel cycles means
1:06 pm
6. Explain the limitations of SI engines in terms of their ability to operate at much higher compression
ratios. What is this limitation called?
7. Provide general plot(s) for thermal efficiency, 7 vs compression ratio, r for…
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Which of the following are correct and valid for the Kelvin-Plank statement?
Oc Any
device
O a. It is
impossible
for any
device
O e. It is
possible
for any
O b. It is
impossible
O d. No heat
engine can
have a
Of. Kelvin-
Planck
Og. Kelvin-
O h. It is
impossible
Planck
that
statement
of the
to construct
statement
to construct
a device
that
of the
a device
that
violates
thermal
device
that
the
efficiency of
100
that
second
second
Kelvin-
Planck
operates in
a cycle and
produces
no effect
other than
operates in
a cycle and
produces
no effect
other than
operates
law is
law is
operates
on a cycle
to receive
positive
statement,
and a
percent, or
as for a
negative
statement,
and a
on a
statement
also
cycle to
receive
power plant
to operate,
the working
fluid
heat from
violates
a single
reservoir
and
heat
negative
statement
cannot be
positive
the transfer
of heat from
a higer-
temperature
body to a
lower-
the
from a
statement
the transfer
Clausius
single
reservoir
and
of heat from
a lower-
can…
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Project 2
As part of your work-study program at the HTU, you successfully got selected to be trained at the
Rehab power station for electrical energy generation. In the first week of your CO-OP journey the
head of the department asked you to do the following tasks:
Task 1
Write down the energy balance equation from the first law of thermodynamics for a closed system
and then put the equation for an open system. Explain the difference between the two equations.
Task 2
Apply the Steady Flow Energy Equation to compressor, turbine, boiler, pipe, mixing chamber and
condenser.
Task 3
Discuss the following scenarios:
a) Consider an air compressor that operate under the same conditions over long period of time.
How would you compare the volume flow rates of the air at the inlet and exit of the
compressor?
b) Do you think that the temperature of air will rise as it is compressed by an adiabatic
compressor? Explain
c) Do you think that the temperature of air will drop as it undergoes a steady…
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A freezer uses 100 kJ of electrical energy to move 330 kJ of thermal energy from inside the freezer to outside. We can determine how much the room temperature increases when 1 kg of ice freezes.
a. How much thermal energy must be removed from 1 kg of 0oC water to turn into 0oC ice? (the latent heat of fusion of water is 320 kJ/kg)
b. How much electrical energy is used to freeze the ice?
c. What is the total energy, including waste heat, exhausted by the freezer into the kitchen?
d. A kitchen contains 43 kg of air (specific heat capacity of 1.0 kJ/kgK). Before the ice freezes, the air temperature is 20oC. After the ice freezes, at which temperature will the air be: 22oC, 25oC or 30oC?
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Read the questions carefully before answering. Box or indicate your final answers when solving and draw your diagrams cleanly. Use the steam tables provided and DO NOT ROUND the values from the steam table. Write down the values taken from the steam table.
Steam undergoes an Isentropic process where it is initially at 1.30MPa and200C then it expands to a pressure of 0.75MPa, thus becoming wet steam. What is the dryness of the steam and the change in enthalpy for the process?
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Related Questions
- ! Required information NOTE: This is a multi-part question. Once an answer is submitted, you will be unable to return to this part. A Carnot heat pump is to be used to heat a house and maintain it at 25°C in winter. On a day when the average outdoor temperature remains at about 2°C, the house is estimated to lose heat at a rate of 55,000 kJ/h. The heat pump consumes 5.15 kW of power while operating. HP 25°C 2°C 55,000 kJ/h How long did the heat pump run on that day?arrow_forwardA house is heated and maintained at 20 °C by a heat pump. Part A Part B Based on these results, would you recommend heat pumps at locations with a severe climate? Match the words in the left column to the appropriate blankes in the sentences on the right. Reset Help mild 1. Given that a real heat pump is significantly efficient than a Carnot heat pump, the increases advantage of a heat pump over electric heating rapidly when the outside temperature becomes really low. less more 2. As the COP decreases, the heating power decreases 3. A heat pump is ideal for a climate. severe Submit Request Answerarrow_forward7. In the summer it tends to become quite hot and humid in the Guelph area. Many home owners purchase dehumidifiers to remove moisture from the air. Excessive moisture can create problems with dampness in basements, so it is a good idea to keep the situation under control, Dehumidifiers work on the principle that when air is cooled, its ability to hold moisture decreases Therefore, the dehumidifier consists of a cabinet-like structure containing a refrigeration coll. As the room air blows over this coil. it is cooled to a temperature that is below its dew point. Moisture then condenses out of the air and is collected in a bucket (or directed by a hose to a floor drain), A curious home owner wonders how much water will be collected in a 12 hour period. He empties the bucket at the start of the test and comes back exactly twelve hours later to see how much water has been collected. Calculate the amount of water that would be collected in a twelve-hour period if 1.15 cubic metres per…arrow_forward
- QUESTION 4 1. This question is about the section titled, Airplanes. Which of the following statement is NOT true according to this reading? The design known as "winglets" was shown to reduce fuel use by 5%. How an airplane operates with respect to taxi or take-off has an insignificant impact on the airplane fuel use. C C Jet biofuel is currently expensive and limited in supply. The goal of the Carbon Offset and Reduction Scheme of International Aviation (CORSIA) isarrow_forwardpt) You have two solar hot water collectors on the roof, each is 4 feet by 8 feet. Assume the panels are 50% efficient. The panels receive about 300 BTU per hour per square foot, for a total of 5 hours. You have a hot water tank connected to the panels filled with 600 pounds of water, starting in the morning at 60 deg F. What will the water temperature be at the end of the 5 hours?arrow_forwardQuestion 6 Compare the carbon emissions per MJ to heat household water using the following two energy systems: a) A 25% efficient coal-fired power plant delivering electricity to a 99% efficient electric water heater. Assume LHV carbon intensity of coal is 25.8 gC/MJ. b) A new 50% efficient natural gas-fired combined cycle power plant to a 99% efficient electric water heater. You must calculate the LHV carbon intensity of natural gas. Assume 100% methane and ideal conditions. Assume 5% losses in electrical transmission lines and 90 MJ of fuel input to each system.arrow_forward
- Answer question 2 based on the results of question 1. You have a natural gas furnace in your home that used 78,500 cubic feet of natural gas for heating last winter. Your neighbor has a furnace that burns heating oil, and used 516 gallons of heating oil last winter. You can convert the natural gas and heating oil consumption data into Btu to determine which home used more energy for heating. Natural gas BTU: 1,028 Btu per cubic foot Oil BTU: 138,590 Btu per gallon Natural Gas BTU= 80698000 Btu Oil BTU = 71512440 Btu The home that used a natural gas furnace used more energy for heating. 2. You need a new furnace for your home, and you are comparing systems that use natural gas and heating oil. One factor to consider is the cost of fuel. You can compare the price of the fuels on an equal basis by dividing the price per unit of the fuels by the Btu content per unit of the fuels to get a price per million Btu. Assume Natural gas price = $10.50 per thousand cubic…arrow_forward0 Required information NOTE: This is a multi-part question. Once an answer is submitted, you will be unable to return to this part. A Carnot heat pump is to be used to heat a house and maintain it at 25°C in winter. On a day when the average outdoor temperature remains at about 2°C, the house is estimated to lose heat at a rate of 55,000 kJ/h. The heat pump consumes 4.8 kW of power while operating. 55,000 kJ/h Determine the total heating costs, assuming an average price of $0.11/kWh for electricity. The total heating cost is $40.33 (You must provide an answer before moving to the next part.)arrow_forwardSolve question 2 based on the answer of question 1. You have a natural gas furnace in your home that used 78,500 cubic feet of natural gas for heating last winter. Your neighbor has a furnace that burns heating oil and used 516 gallons of heating oil last winter. You can convert the natural gas and heating oil consumption data into Btu to determine which home used more energy for heating. Natural gas BTU: 1,028 Btu per cubic foot Oil BTU: 138,590 Btu per gallon Natural Gas BTU= 80,698,000 Oil BTU = 71,512,440 The home that used a natural gas furnace used more energy for heating. 2.- You need a new furnace for your home, and you are comparing systems that use natural gas and heating oil. One factor to consider is the cost of the fuel. You can compare the price of the fuels on an equal basis by dividing the price per unit of the fuels by the Btu content per unit of the fuels to get a price per million Btu. Assume Natural gas price = $10.50 per thousand cubic…arrow_forward
- Questions: 1. b. As the power plant engineer, you are asked by the power plant manager to design a new steam-based power plant with a net power output target of 200 MW with a thermal efficiency of 40%. Thermodynamics calculation should be conducted for the known condition illustrated in Figure 1. Boiler P₁ = 8.0 MPa Saturated vapor Condenser Pump Turbine of Vapor and Gas] Cooling water 8.0 MPa 0.008 MPa tw. Saturated liquid at 0.008 MPa Figure 1. Illustration of steam turbine system and its T-S diagram a. Calculate the back work ratio, the system's mass flow rate, and the cooling water's mass flow rate. What kind of efforts should be conducted if the plant manager asks you to increase the system's efficiency to 50% ? Explain and provide proof in the form of calculation! VIOLarrow_forwardQ1: a - An electric home stove with 3 burners and microwave is used in preparing a meal as follows. Burner 1: 20 minutes Burner 2: 40 minutes Burner 3: 15 minutes . Microwave: 30 minutes. If cach burner is rated at 1.2 kW and the oven at 1.8 kW, and electricity costs 1000 (IQ =Iraqi Dinar) per kWh, calculate the cost of electricity used in preparing the meal? 4 marksarrow_forwardAn engineer was tasked with evaluating a heat and power generation unit for an aluminium smelting plant. The management intends to expand the production facilities to meet growing demand for aluminium. The plan involves increasing the energy intensive smelting line from the present single line to three lines by end of 2022. To support the expansion plan, the company plans to install a self-sufficient power generation unit. Details of the energy requirement and the proposed power generation unit is given the following Table. Item Power requirement per smelting processing line 0.6 MW Proposed power generation unit: Supplier • System Description Mitsubishi Heavy Industries Ltd Steam power plant (Carnot heat engines principles) 35% • Overall thermal efficiency Prepare a mini technical power evaluation report for the above project. Your report should include the following items and in the following order: a. Total power (W) and heat (Q) requirement.arrow_forward
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- 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