If the outdoor temperature is 5 ◦ C on a winter day and if 1 kg...
If the outdoor temperature is 5 ◦ C on a winter day and if 1 kg of water at 90 ◦ C is available, how much work can be obtained as the water is cooled to the ambient temperature? Assume that the volume of the water is constant and that the molar heat capacity at constant volume is 75 Jmol −1 K −1 and is independent of temperature.
Homework Answers
3) A home requires 62 kWh of energy (heat) on a winter day to maintain a constant indoor temperat...
3) A home requires 62 kWh of energy (heat) on a winter day to maintain a constant indoor temperature of 20 °C. (a) How much collector surface area does it need for an all-solar thermal heating system that has an absorptivity of 0.2? The average solar radiation in winter is about 6.5 kWh/m2/day. [35 points] a) What is the mass of water required if this energy is stored as sensible heat energy storage system? Where the water operates between 20...
On a summer day, the air temperature is 36°C and the relative humidity is 20%. Water...
On a summer day, the air temperature is 36°C and the relative humidity is 20%. Water evaporates from the surface of a lake at a rate of 0.20 kg/h per square metre of water surface area. The temperature of water is 25°C. (a) Determine the mass transfer coefficient. (10 marks) (b) Determine the convective heat transfer coefficient. (10 marks) (c) Determine the net heat loss (in W/m2) from the lake. (5 marks) The specific volume of water vapour at 25°C...
Consider a “cold” winter day in with an air temperature of 7.22 °C and relative humidity...
Consider a “cold” winter day in with an air temperature of 7.22 °C and relative humidity of about 20% (moisture content 0.001 g H2O/g dry air). A person waiting at a bus stop inhales at an average rate of 8 g dry air/min and exhales air saturated with water at body temperature (37°C) and 1 atm (molal humidity is 6.7%). The heat capacity of dry air is 1.05 J/g- °C. Estimate the rate of heat loss from breathing. Express your...
On a cold winter day, the outside temperature is –5.0 °C while the interior of a...
On a cold winter day, the outside temperature is –5.0 °C while the interior of a well-insulated garage is maintained at 20.0 °C by an electric heater. Assume the walls have a total area of 75 m2, a thickness of 0.15 m, and a thermal conductivity of 0.042 W/(m · C°). What is the cost to heat the garage for six hours at these temperatures if the cost of electricity is $ 0.11/kWh? Note: 1 kWh = 3.6 × 106...
3,1 moles of an ideal gas with a molar heat capacity at constant volume of 5,1...
3,1 moles of an ideal gas with a molar heat capacity at constant volume of 5,1 cal/(mol∙K) and a molar heat capacity at constant pressure of 7,7 cal/(mol∙K) starts at 317,6 K and is heated at constant pressure to 335,9 K, then cooled at constant volume to its original temperature. How much heat (cal) flows into the gas during this two-step process? Answer in two decimal places.
5. A rigid tank initially contains 10 kg O2 at 200 kPa and 600 K. Now...
5. A rigid tank initially contains 10 kg O2 at 200 kPa and 600
K. Now O2 is gradually cooled under constant volume until its
temperature reaches 455 K. (18 Points) (a) Calculate the pressure
of O2 at final state. (4 points) (b) Determine the boundary work.
(6 points) (b) Calculate the heat transfer during this process. (8
Points)
let me know if u want the property table
MAE 320 - Thermodynamics + > e ecampus.wvu.edu/bbcswebdav/pid-6846897-dt-content-rid-82617141 1/courses/star50314.202005/MAE320-2020-Summer-HW04.pdf Q4 to Q6...
2. The temperature of the air in a room needs to be adjusted (from room temperature...
2. The temperature of the air in a room needs to be adjusted (from room temperature and pressure, 298 K and latm). The room is 10.0 m wide, 22.0 m deep, and 3.0 m high. The approximate constant pressure heat capacity of air is Cp 1.0 kJ/(K*kg)1. Assume the air in the room is an ideal gas. 2.1 What is the approximate mass of the air in the room? (Use molar volume and molar weight of air) 2.2 How much...
On a winter day with a temperature of Tc, the temperature inside a room is Th,...
On a winter day with a temperature of Tc, the temperature inside a room is Th, where Th > Tc. The heat conduction rate through a slab of thickness L, surface area A, thermal conductivity k is measured to be H. Assume you found a way to triple the slab thickness and reduce the thermal conductivity to one quarter, what is the new heat transfer rate H’ in terms of H? Assume the temperatures inside and outside the room and...
On a cold winter day, the outside temperature is -20°C and the inside temperature is maintained...
On a cold winter day, the outside temperature is -20°C and the inside temperature is maintained at 20°C. There is a net heat flow to the outside through the walls, roof, etc., of 25 kW. What is the rate of increase of the entropy of the universe as a result of this heat flow?
4. A 0.500 kg piece of copper at an initial temperature of 20.0°C is placed in...
4. A 0.500 kg piece of copper at an initial temperature of 20.0°C is placed in a water bath and the temperature of the metal is raised to 100.0°C. Note: The specific heat capacity of copper is 385J/kg K and the latent heat of fusion is 2.07x1057/kg. a. How much heat was required to raise the temperature of the copper? b. How much more heat would be required to raise the copper to its melting point? C. How much heat...
3) A home requires 62 kWh of energy (heat) on a winter day to maintain a constant indoor temperature of 20 °C. (a) How much collector surface area does it need for an all-solar thermal heating system that has an absorptivity of 0.2? The average solar radiation in winter is about 6.5 kWh/m2/day. [35 points] a) What is the mass of water required if this energy is stored as sensible heat energy storage system? Where the water operates between 20...
5. A rigid tank initially contains 10 kg O2 at 200 kPa and 600
K. Now O2 is gradually cooled under constant volume until its
temperature reaches 455 K. (18 Points) (a) Calculate the pressure
of O2 at final state. (4 points) (b) Determine the boundary work.
(6 points) (b) Calculate the heat transfer during this process. (8
Points)
let me know if u want the property table
MAE 320 - Thermodynamics + > e ecampus.wvu.edu/bbcswebdav/pid-6846897-dt-content-rid-82617141 1/courses/star50314.202005/MAE320-2020-Summer-HW04.pdf Q4 to Q6...
2. The temperature of the air in a room needs to be adjusted (from room temperature and pressure, 298 K and latm). The room is 10.0 m wide, 22.0 m deep, and 3.0 m high. The approximate constant pressure heat capacity of air is Cp 1.0 kJ/(K*kg)1. Assume the air in the room is an ideal gas. 2.1 What is the approximate mass of the air in the room? (Use molar volume and molar weight of air) 2.2 How much...
4. A 0.500 kg piece of copper at an initial temperature of 20.0°C is placed in a water bath and the temperature of the metal is raised to 100.0°C. Note: The specific heat capacity of copper is 385J/kg K and the latent heat of fusion is 2.07x1057/kg. a. How much heat was required to raise the temperature of the copper? b. How much more heat would be required to raise the copper to its melting point? C. How much heat...
Most questions answered within 3 hours.
-
Please respond to each of the below questions in a minimum of 5
well written paragraphs...
asked 1 minute ago -
On January 1, Year 1, Brown Co. issued bonds with a face value
of $115,000, a...
asked 7 minutes ago -
calculate the oxidation state of carbons C18H36O2 and
C18H36018
and then calculated the number of electrons...
asked 7 minutes ago -
It is better to optimize alpha by using trial and error methods
or by using methods...
asked 15 minutes ago -
An urn contains 39 red, 17 white and 30 blue marbles. A child
selects two marbles...
asked 17 minutes ago -
A student conducting this experiment weighs out 2.80 g of
CoCl2.6H2O.
For this part you will...
asked 25 minutes ago -
A cube, 100.0m on a side, has a total charge of 12.0 nC
distributed uniformly on...
asked 15 minutes ago -
Let's consider that two hockey players with equal mass, moving
with the same speed of 10...
asked 16 minutes ago -
Find the mid-range for the given sample data. Listed
below are the amounts of time (in...
asked 33 minutes ago -
If one wants to airlift a “thanksgiving’s” turkey (mass=3kg)
using a balloon. What would be the...
asked 29 minutes ago -
An institute reported that 63% of its members indicate that
lack of ethical culture within financial...
asked 32 minutes ago -
A proposal to your local city council in which you propose how
to use the money...
asked 41 minutes ago