A 75 gal. electric hot water heater provides 9000 Watts of power to heat water. If the heater is filled with water at an initial temperature of 50ºF, how long will it take for the water to reach 140ºF? Assume that there are no heat losses

A 75 gal. electric hot water heater provides 9000 Watts of power to heat water. If the heater is filled with water at an initial temperature of 50ºF, how long will it take for the water to reach 140ºF? Assume that there are no heat losses

Sustainable Energy

2nd Edition

ISBN:9781337551663

Author:DUNLAP, Richard A.

Publisher:DUNLAP, Richard A.

Chapter8: Direct Use Of Solar Energy

Section: Chapter Questions

Problem 7P

See similar textbooks

Related questions

Q: Determine the power transmitted by a jet of water discharging though a nozzle that is fitted to a…

A: Given: Length of pipe, L = 300 m Diameter of pipe, D = 100 mm = 0.1 m Coefficient of friction, f =…

Q: Q1. Assume that you have an artificial lake (8x4 m dimensions) is filled with 75 ton of water the…

A: Given data Volume = 75 ton = 75m3 Q = 0.01 m3sec-1 Area = 8*4 = 32 m2 Depth of water (y)=…

Q: Problems to be solved during week 11: Question 9 (T1-T4) T1. Water is being pumped at 8.85 I/s by a…

Q: A refrigerator is to remove heat from the cooled space at a rate of 300.74 kJ/min to maintain its…

A: A type of elastic collision in which two objects of equal mass initially move in the same direction…

Q: m/N of oil flowing, calculate the power delivered Suction pipe is 1.4 N-m/N of oil flowing,…

A: Given:- 840 L/min crude oil sg=0.85 total energy loss=4.2N-m/N To find:- pressure at the pump level…

Q: pump discharges 1129.52 kg/min of water to a vertical tank (10ft dia by 15 ft height). Find the…

Q: A closed tank contains 20m deep water. A hose is connected as shown such that the nozzle (diameter =…

A: To Determine Theoretical exit velocity (v) at the nozzle assuming no losses.

Q: Q1; If a system has 30J of heat added to it, and the total change in its internal energy is 10J, how…

A: Given, Heat ,Q = 30 J Change, In internal energy, ∆U…

Q: Water enters a hydraulic turbine through a 35-cm-diameter pipe at a rate of 0.8 m3/s and exits…

A: Inlet diameter = d1 = 35cm Outlet diameter = d2 = 30cm Discharge = Q = 0.8 m3/s Pressure drop = hm =…

Q: Calculate the stopping sight disance for a design speed of 1000 kmph. Take the total reaction time…

Q: PROBLEM 6 Sketch the EGL and HGL for the system shown below and label with the energy heads. Include…

Q: The rate of flow of water through a pipe of length 2000 m and diameter I m is 2 m'/s. At the end of…

A: Given: Length of pipe, L = 2000 m Diameter of pipe, D = 1 m Discharge, Q = 2 m3/s Diameter of…

Q: Given The figure shows a pump delivering 700 L/min of oil (sg - 0.8a) from an underground storage…

Q: Q1. Assume that you have an artificial lake (8x4 m dimensions) is filled with 75 ton of water the…

A: Volume = 75ton = 75m3 Q = 0.01m3

Q: A well-insulated and perfectly sealed room is installed with 4-hp fan to circulate air for 1.5…

Q: Water from an open tank elevated 5m above ground is allowed to flow down to a pump. From the pump,…

A: Given, L = 100 m np = 55% Q = 0.8 m3/min or 0.0133 m3/s

Q: A 6MW generator had a thrust of 103,000 lb. The outside diameter of the step bearing is 12 in, and…

A: The given values are as follows Generator is 6MWThrust is 103000lbThickness is 0.004Use SAEoil is…

Q: A pump is being used to transfer water from one tank to another. Each tank has air pressure above…

A: step 1-

Q: Q3) Determine the diameter of a galvanized iron pipe (e-0.07 mm) and the average velocity in the…

Q: A mains fed 12000 litre tank supplies hot rinse water (450C) for a food processing operation.…

A: Answer We are given Volume of water = 12000 litre Required raised temperature = 45oC Given time = 3…

Q: 14-41. The pipe system consists of a 3-in.-diameter, 100-ft- long galvanized iron pipe, a fully…

A: Total losses will be sum of all loss of coefficients ; kTL = Flush entrance + gate valve + elbow…

Q: Sketch the EGL and HGL for the system shown below and label with the energy heads. Include the minor…

Q: 3. A pump is attached to a fire hydrant to produce a jet that rises to a minimum height of 24 m at a…

A: The compressive force per unit area is known as pressure, and it seems to be a vector. Pressure in a…

Q: Design a temperature indicator system that works in the following manner: 1) D1 will be on when T >…

A: Given data 1) D1 will be on when T > 40 C 2) D2 will be on when 40 C > T > 20 C 3) D3 will…

Q: A fan with a capacity of 1.5 m³/s draws air at a static pressure of 3.0 cm of water through a duct.…

Q: During the winter storm of February 13 to 17 2021, the power company of City of Birds, requested the…

A: Elevation of water at lake birds (ha) = 50 mElevation of water at storage tanks (hb) = 100 mLength…

Q: G 0.85), find the total energy head (m) at point A with respect into a datum at the pump. Suction…

A: According to given dataThe solution of the problem is given belowThe Energy Head would be -4.40…

Q: Prob-1 A room is heated with a 1500 W electric heater. How much power can be saved if a heat pump…

Q: A closed tank contains 20 m deep water. A hose is connected as shown such that the nozzle (diameter…

A: Given data, Air gauge pressure = 200 kPa Height of water = 20 m To find out the theoretical height…

Q: A liquid whose specific gravity is 2.0, is flowing in a 50mm diameter pipe. The total head at a…

A: power is generally a measure of the rate at which work is done. In other words, it is operating…

Q: A fan is to be selected to ventilate a bathroom whose dimensions are 2 m × 3 m × 3 m. The air…

Q: An ideal vapor-compression heat pump cycle with Refrigerant 134a as the working fluid provides 15 kW…

Q: An atmospheric pressure of 100 kPa exists inside a room. Air is exhausted through a 0.5 m diamter…

A: To find Fan capacity if the operating speed is changed to 1200 rpm

Q: Question 2 Oil (SG = 0.85) is flowing in a 10cm diameter pipe. The elevation of the pipe is 5m above…

A: Given:- Discharge in pipe = 30 l/s = 0.03 m3/s Diameter of pipe = 30 cm = 0.3 m Elevation above…

Q: The rate of flow of water through a pipe of length 2000 m and diameter 1 m is 2 m'/s. At the end of…

A: Given: Length of pipe, L = 2000 m Diameter of pipe, D = 1 m Discharge, Q = 2 m3/s Diameter of…

Q: Water flows steadily through the elbow, which discharges to the atmosphere. Ac the section 1, the…

A: Z1=3m Z2=2m P1=75kPa V1=1.9m/s V2=6.9m/s

Q: 10.55 Water (60°F) is pumped from a reservoir to a large, pressurized tank as shown. The steel pipe…

A: Calculate the velocity through the pipe:V=QAQ= 1 ft3/sA=π4D2=π44122=0.0873 ft2V=QA=10.0873=11.459…

Q: 1. If the velocity of flow in a 75mm diameter fire hose is 0.5m/s, what is the velocity (m/s) in a…

A: solution Given fire hose dia d1=75mm velocity v1=0.5m/snozzle dia d2=25mmvelocity v2use continuity…

Q: A closed tank contains 20 m deep water. A hose is connected as shown such that the nozzle (diameter…

A: Given data in question Pressure Depth of water Diameter To find out Discharge

Q: A liquid whose specific gravity is 2.0, is flowing in a 50mm diameter pipe. The total head at a…

Q: 100°? air flows through a round aluminum tube of ID 60mm and OD 80mm at 4 ?? .The tube is covered in…

A: Take 25 °C as room temperature r1=30 mmr2 = 40 mmr3 = 45 mm Assume unit length of the tube Thermal…

Q: Q2) A double-pipe counter flow heat exchanger is to coo! ethylene glycol (Cp-2560J/kg.°C) flowing at…

Q: 2. If the velocity of flow in a 75-mm diameter fire hose is 0.5 m/s, what is the velocity ina…

Q: 18- Water flow (frictionless) through a long horizontal conical diffuser at a rate of 4.2 m3/sec.…

A: Given: The discharge is 4.2 m3/sec. The diameters are 1 m and 1.6 m. The pressure at the smaller end…

Q: pump discharges 1129.52 kg/min of water to a vertical tank (10ft dia by 15 ft height). Find the…

Q: In large buildings, hot water in a water tank is circulated through a loop so that the user doesn't…

Q: How many persons in a conference room? that have the following conditions RSH= 0.030MW, sensible…

A: GIVEN :- Room sensible heat, RSH = 0.03 MW = 3*104 W Sensible heat per person = 0.1 kW = 100 W…

Q: Question 12 Four light bulbs, rated at 100 W, 75 W, 50 W and 25 W each, are in parallel. What is the…

A: step 1-

Concept explainers

Thermal Processes

Some of the key areas where thermal processes find their application are:

Question

Expert Solution

This question has been solved!

Explore an expertly crafted, step-by-step solution for a thorough understanding of key concepts.

This is a popular solution!

SEE SOLUTION Check out a sample Q&A here

Step 1: Answer

VIEW

Step 2:

VIEW

Trending now

This is a popular solution!

Step by step

Solved in 2 steps

SEE SOLUTION Check out a sample Q&A here

Knowledge Booster

Learn more about

Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, civil-engineering and related others by exploring similar questions and additional content below.

Similar questions

A refrigerator is to remove heat from the cooled space at a rate of 300.74 kJ/min to maintain its temperature at -8 C. If the air surrounding the refrigerator is at 28.91 C, determine the minimum power input (kW) required for this refrigerator.
A wooden shelter has walls constructed of wooden planks 1.00 cm thick. If the exterior temperature is -20.0°C and the interior is 5.00°C, find the rate of energy loss through a wall that has dimensions 1.95 m by 2.30 m.
Calculate the heat loss from a double-pane glass window consisting of two pieces of glass, each having a thickness of 10 mm with a thermal conductivity of k = 1.3 W/m.K . The two glass panes are separated by an air gap of 7 mm. Assume thermal conductivity of air to be k = 0.022 W/m.K .
The heat exchanger radiates thermal energy at the rate of 2500 kJ/h for each square meter of its surface area. Determine how many joules (J) are radiated within a 5-hour period.
Residential annual energy use. For a house with: Air exchange rate of 0.5 h−1 Cp = 1000 J/kg.K Density of air = 1.2 kg/m3 Roof area = 144 m2; opaque wall area = 96 m2; window area = 24 m2; volume = 360 m3 Conductivity of Uwall = 0.60 W/(m2-K); Uwin = 3.0 W/(m2-K); Uroof = 0.40 W/(m2-K) Heating system efficiency of 0.85 Heating degree days (HDD) of 3500 K-days Calculate the Ktot for this house. Calculate the annual energy used to heat this house (in GJ).
Compare the masses and volumes of water, concrete, sand, and wood needed to store 106 Btu of heat if the operating temperatures are Tc = 85F and Th = 180F. In each case, calculate the edge length of a square storage unit with a height of 8 ft.
A heat pump supplies heat energy to a house at the rate of 140,000 kJ/h when the house is maintained at 25°C. Over a period of one month, the heat pump operates for 100 hours to transfer energy from a heat source outside the house to inside the house. Consider a heat pump receiving heat from two different outside energy sources. In one application the heat pump receives heat from the outside air at 0°C. In a second application the heat pump receives heat from a lake having a water temperature of 10°C. If electricity costs $0.105/kWh, determine the maximum money saved by using the lake water rather than the outside air as the outside energy source.
On a hot summer day, the flat roof of a tall building reaches 50° C in temperature. The area of the roof is 400m2. Estimate the heat radiated from this roof to the sky in the evening when the temperature of the surrounding air or sky is at 20° C. The temperature of the roof decreases as it cools down. Estimate the rate of energy radiated from the roof, assuming roof temperatures of 50, 40, 30, and 25° C. Assume ε = 0 9 . for the roof.
Find the specific energy of flowing water through a rectangular channel of width 5 m when the discharge is 10~m^{3}/s and depth of water is 3 m.
Suppose the pump of Fig. is situated between two water tanks with their free surfaces open to the atmosphere. Which free surface is at a higher elevation—the one corresponding to the tank supplying water to the pump inlet, or the one corresponding to the tank connected to the pump outlet? Justify your answer through use of the energy equation between the two free surfaces.
A 10m dia. Cylindrical tank has a height of 5m and is full of water at 20ºC (unit weight of water=9.789kN/m3). If the water is heated to a temperature of 50ºC (unit weight of water=9.689kN/m3 ). a. Compute the weight of water. b. What is the final volume when heated to a temp. Of 50ºC? c. Determine the volume of water that will spill over the edge of the tank.
A vertical cylindrical tank having a base diameter of 12 m and a height of 5 m is filled to the top with water at 20°C. How much water will overflow if the water is heated to 80°C? Answer 16.46 tons