Q2.3 Solar houses are designed to retain the heat absorbed during the day so thatthe stored hear can be released during the night. A botanist produces steam at100 during the day and then allows the steam to cool to 0 °C and freeze duringthe night. How many kilograms of water are needed to store 200 kJ of energyfor the process? (Use the laten heat of vaporization of water L. = 22.6 × 105 3/Kg, the laten heat of fusion of water L₁= 33.5 x 104 J/Kg, and the specific heatcapacity of water c = 4186 J/kg. C. Hint: you need to use both the formula ofthe heat Q = mcVT and Q = mL)

Answered: Image /qna-images/answer/0f09d26e-9ee3-4d4c-ac49-24d88debb30c.jpg

Answered: Q2.3 Solar houses are designed to…

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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Ice is added to hot tea in a thermos and then, the thermos is closed. The energy loses through the thermos lid and walls are negligible. After a while, the system including ice and water reached thermal equilibrium. In this process, the total energy of the system.. O Increased O Decreased O did not change
2. 1 mole of an ideal gas initially at 300K and 1 atm is heated and allowed to expand re- versibly at constant pressure against a piston until the final temperature is 600K. The heat capacity of this gas is Cp,m = 2.5R, constant over the temperature range. a) Calculate the heat and work (q and w) for this process. b) What are ASys and ASurr for this process? c) Now suppose the system is heated from the same inital to final state (300K to 60OK at latm) but by using a blowtorch (temperature blowtorch ASsurr change for this new process? 1500K). How would AS,ys
An electric resistance heater is used to provide space heating at an efficiency level of 100%. The electricity is sold at $0.13 per kWh. Question: How much money is needed if 1137.8 MBH is demanded? Hint: 1 MBH equals 1,000 btuh
A piston-cylinder assembly with a linear spring acting on the piston as shown below contains the refrigerant R-134a at 15°C with a quality of x=0.6 in a control volume of V= 0.02 m³. The R-134a is heated up to 60°C at which point the specific volume is v= 0.03002 m³/kg. Po = 101.3kPa a) Determine the final pressure. b) Determine the final volume. c) Determine the work in the process. d) Determine the heat transfer in the process e) Draw a p-v diagram to qualitatively show the process f) Are there any parameter(s) missing for the calculation of the linear spring constant? if so, which one(s)? develop an equation to calculate the linear spring constant Po R-134a
Q3. As shown in figure Q3, two tanks connected with valve are containing air with the given condition as shown in the figure. Now the valve is opened and the air in the two tanks are allowed to mix and reach to equilibrium condition with the surrounding temperature of 20°C. Considering the necessary assumptions, determine (a) the volume of tank B, (b) the pressure of both tanks after the valve is opened. (c) Can we use ideal gas low for saturated water steam at atmospheric pressure? Discuss the reason. (The gas constant of air is R = 0.287 kPa.m³/kg.K.) A В V = 1 m3 m = X m3 T= 17 °C T= 35 °C P = 450 kPa P = 300 kPa Figure Q3.
A canister of sevoflurane, an inhaled anesthetic, is warmed to room temperature over the course of 30 minutes. As the gas warms, it pushes on a movable piston with a force of 623 mN, increasing the volume of the gas by 16 cm^3. How much work was done by the gas? A. 0.03 CJ B. 0.27 CJ C. 2.7 CJ D. 270 CJ
In a quasi-static isobaric expansion, 540 J of work are done by the gas. The gas pressure is 0.90 atm and it was originally at 15.0 L. If the internal energy of the gas increased by 70 J in the expansion, how much heat (in J) does the gas absorb?
There is an 500g container made out of aluminum holding 300g of water. The Water and Aluminum have reached thermal equilibrium at 40 degrees Celsius. A 200g block of iron at a temperature of 0 degrees Celsius is later dropped into the water. Using the specific heat for water=4180J/kg/C. The specific heat for aluminum is 900 J/kg/C. The specific heat for iron is 450 J/kg/C. The final temperature of the three materials will be degrees celsius. The thermal energy of the water changes by Joules. (give an amount and include a + if it increases and a - if it decreases) The thermal energy of the aluminum changes by Joules. (give an amount and include a + if it increases and a - if it decreases) The thermal energy of the iron changes by Joules. (give an amount and unit and include a + if it increases and a - if the value decreases)
Q3: You have an ideal gas in an insulated container. You compress it from a pressure of 40 × 105 Pa to 20 × 105 Pa, while increasing the volume from 10 to 20 m3. What is the work you done by the gas a- 10 J b- 300 J c- 500 J d- 880 J
ft-lb 7. One pound of air R = 53.3 is compressed isothermally in a closed system from ib-R 15 psia and 80°F to 90 psia. Compute the heat transfer.
A cylinder-piston assembly contains 1 kg of a substance at 100 kPa. The initial volume is 0.5 m3. Heat is transferred to the substance in an amount necessary to cause slow expansion at constant temperature. This process ends when the final volume is twice the initial volume. Determine the magnitude of the heat transferred if the substance is: a) Nitrogen (ideal gas. Assume constant specific heat) b) Water
1 - Consider 2 kg of water in a cylinder blocked by a piston at 20 C, 200 kPa. Water is heated and piston starts to rise. When the piston reaches the blocks, the volume of water has doubled. Heating continues until the pressure also doubles. Calculate the work done by water and the amount of heattransfer. Consider the case that the piston is restricted by the linear spring. Initially the spring is at rest. Water is heated until the piston reaches the blocks. Just before it hits the blocks the pressure is twice the initial pressure. Calculate the work done by water and the amount of heat transfer by the time the piston reaches the blocks. 7 D H₂0

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