A schematic diagram of a water heater using solar energy is shown below. Oil is circulated...
Fantastic news! We've Found the answer you've been seeking!
Question:
Transcribed Image Text:
A schematic diagram of a water heater using solar energy is shown below. Oil is circulated through the closed circuit using a pump. Oil is heated up in the solar collector and is then passed to the water storage tank in which heat is exchanged between the heated oil and the cold water in the tank, then the oil returns back the solar collector for further heating. The circulation of oil continues until the water set temperature is reached. Assume that the solar irradiance is constant with time and it is equal to 1000 W/m?, the efficiency of the collector is 75%, the surface area of the collector is 1 m2, the amount of water to be heated is 10 kg, the specific heat of water is 4.18 kJ/kgK, the initial temperature of water and oil is 25°C, the heat transfer coefficient by from the oil to the water is 10 W/m²K, the surface area of the heat exchanger pipes is 0.2 m2 and of diameter 1 cm. The circulated oil is thermal oil that is used in cooling of transformers, and its mass flow rate is 0.3 kg/s. It is required to heat the water in the storage tank to 50°C. Determine, a. How long it will take to heat up the water in the storage tank from 25°C to 50°C. b. Draw the temperature of the water in the tank versus time. c. How much will be the heating time if the oil mass flow rate is decreased to 0.1 kg/ s and if it is increased to 0.5 kg/s. Q solar T oil in, Tank T oil out, Collector Solar collector Storage Tank T oil in. Collector T oil out, Tank Pump Control unit Figure 1: closed loop solar collector system Marking criteria 1- Writing down the set of equations (5 p) 2- Solving one iteration (2 p) 3- Solving parts a, b and c (3 p) A schematic diagram of a water heater using solar energy is shown below. Oil is circulated through the closed circuit using a pump. Oil is heated up in the solar collector and is then passed to the water storage tank in which heat is exchanged between the heated oil and the cold water in the tank, then the oil returns back the solar collector for further heating. The circulation of oil continues until the water set temperature is reached. Assume that the solar irradiance is constant with time and it is equal to 1000 W/m?, the efficiency of the collector is 75%, the surface area of the collector is 1 m2, the amount of water to be heated is 10 kg, the specific heat of water is 4.18 kJ/kgK, the initial temperature of water and oil is 25°C, the heat transfer coefficient by from the oil to the water is 10 W/m²K, the surface area of the heat exchanger pipes is 0.2 m2 and of diameter 1 cm. The circulated oil is thermal oil that is used in cooling of transformers, and its mass flow rate is 0.3 kg/s. It is required to heat the water in the storage tank to 50°C. Determine, a. How long it will take to heat up the water in the storage tank from 25°C to 50°C. b. Draw the temperature of the water in the tank versus time. c. How much will be the heating time if the oil mass flow rate is decreased to 0.1 kg/ s and if it is increased to 0.5 kg/s. Q solar T oil in, Tank T oil out, Collector Solar collector Storage Tank T oil in. Collector T oil out, Tank Pump Control unit Figure 1: closed loop solar collector system Marking criteria 1- Writing down the set of equations (5 p) 2- Solving one iteration (2 p) 3- Solving parts a, b and c (3 p)
Expert Answer:
Related Book For
Physics
ISBN: 978-0077339685
2nd edition
Authors: Alan Giambattista, Betty Richardson, Robert Richardson
Posted Date:
Students also viewed these chemistry questions
-
The figure shows a schematic diagram of a defective eye. What is this defect called?
-
The figure shows a schematic diagram of a microscope. For the object and image locations showed, which of the points (A, B, C, or D) represents a focal point of the eyepiece? Draw a ray diagram....
-
1) a) Draw a schematic diagram of an X-ray diffractometer. [4 marks] b) The results of an X-ray diffraction experiment that used X-rays of wavelength 0.154 nm show the first 6 peaks at angles of...
-
Some managers and union officials also refer to the collective agreement as what? Multiple Choice The real boss The rule book The bible The guiding framework Strategic doctrine
-
Ten basketball players meet in the school gym for a pickup game. How many ways can they form two teams of five each?
-
A certain health maintenance organization (HMO) is studying its daily office routine. They collect information on three variables: the number of patients who visit during a day, the patients...
-
The Mollier diagram is a plot of (a) Temperature versus enthalpy (b) Temperature versus entropy (c) Enthalpy versus entropy (d) Temperature versus internal energy.
-
Regional Airlines is establishing a new telephone system for handling flight reservations. During the 10:00 A.M. to 11:00 A.M. time period, calls to the reservation agent occur randomly at an average...
-
Sports Emporium has two operating segments: sporting goods andsports apparel. The income statement for each operating segment ispresented below. Required: 1. Complete the \"%\" columns to be used ina...
-
Thomas was raised with an understanding of the fundamental differences between right and wrong. As an adult, he wasn't making enough money to purchase a new car as quickly as he liked. He found out...
-
Comparing Profitability and Turnover Ratios for Retail Companies Selected financial statement data for Best Buy Co., The Kroger Co., Nordstrom, Inc., ODP Corp., and Walgreens Boots Alliance, Inc. is...
-
Malone Company makes and sells products with variable costs of $ 2 4 each. Malone incurs annual fixed costs of $ 4 2 8 , 4 0 0 . The current sales price is $ 8 7 . Note: The requirements of this...
-
Northwood Company manufactures basketballs. The company has a ball that sells for $ 2 5 . At present, the ball is manufactured in a small plant that relies heavily on direct labor workers. Thus,...
-
At the end of June, the job cost sheets at Ace Roofers show the following costs accumulated on three jobs. At June 30 Direct materials Direct labor Overhead applied Additional Information Job 5 $...
-
In March, Blossom Company had the following unit production costs: materials $8 and conversion costs $6. On March 1, it had no work in process. During March, Blossom completed and transferred out...
-
The following are the sales transactions of EcoMart Merchandising. EcoMart uses a perpetual Inventory system and the gross method. October 1 Sold merchandise for $3,000, with credit terms n/30,...
-
Find the final amount of money in an account if $6,000 is deposited at 2.5% interest compounded weekly and the money is left for 6 years. The final amount is $ Round answer to 2 decimal places
-
If |62x|>9, which of the following is a possible value of x? A. 2 B. 1 C. 0 D. 4 E. 7
-
(a) Find the equivalent capacitance between points A and B for the five capacitors. (b) If a 16.0-V emf is connected to the terminals A and B, what is the charge on a single equivalent capacitor that...
-
A 0.030-kg bullet is fired vertically at 200 m/s into a 0.15-kg baseball that is initially at rest. The bullet lodges in the baseball and, after the collision, the baseball/ bullet rise to a height...
-
A pole-vaulter of mass 60.0 kg vaults to a height of 6.0 m before dropping to thick padding placed below to cushion her fall. (a) Find the speed with which she lands. (b) If the padding brings her to...
-
A mixture containing \(15 \mathrm{~mol}\) per cent ethane, \(35 \mathrm{~mol}\) per cent propane, and \(50 \mathrm{~mol}\) per cent n-butane is brought to a condition of \(40^{\circ} \mathrm{C}\) at...
-
Ethyl alcohol and hexane form an azeotrope containing \(33.2 \mathrm{~mol}\) per cent ethanol at \(58.7^{\circ} \mathrm{C}\) and \(1 \mathrm{~atm}\) pressure. Determine the van Laar parameters at...
-
n-heptane and toluene form an ideal solution mixture. At \(373 \mathrm{~K}\), their vapour pressures are \(106 \mathrm{kPa}\) and \(74 \mathrm{kPa}\) respectively. Determine the composition of the...
Study smarter with the SolutionInn App