An electric heater supplies (R+2.5)kW of power in the from of heat to water. If in 5.5 hours, 350kg of water is heated from - 10°C to 60°C, find the work done (W) of heater. Also calculate the amount of heat energy (Q) transferred to the water. Consider the specific heat of water is 4184J/kg k. R= 83

An electric heater supplies (R+2.5)kW of power in the from of heat to water. If in 5.5 hours, 350kg of water is heated from - 10°C to 60°C, find the work done (W) of heater. Also calculate the amount of heat energy (Q) transferred to the water. Consider the specific heat of water is 4184J/kg k. R= 83

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

Similar questions

The volume of atmospheric water is 12669km3. The evapotranspiration from land is 7200 km3 per month and from ocean is 505000 km3 per year. Estimate the residence time of water molecules in the atmosphere in a month.
The flow rate of the hydroelectric power plant in the figure is 50 m3/s, and 2 meters of water column energy loss occurs due to friction in the pipeline. Find the power that water transfers to the turbine. Calculate the theoretical and actual power of the turbine by taking the efficiency of the turbine-generator group, η = 0.92. (Answer: ?theoric=52 ?? and ?real=48 ??.)
The temperature of 1 m3 of water is decreased by 10C. If this thermal energy is used to lift the water vertically against gravity, what is the change in height of the center of mass?
1. Water at 68 has a dynamic viscosity of 1 centipoise. Compute its dynamic viscosity and kinematic viscosity in foot pound-second units. 2. A volume of 15.5 cu.ft of a liquid weighs 782 lb. Compute the mass density of the liquid. 3. Compute the number of watts which are equivalent to 1 horsepower. (1 watt = 10^7 cm-dynes per sec; 1 hp = 550 ft-lb per sec.) 4. A city of 6000 population has an average water use of 110 gallons per person per day. Compute the average total rate of use in cubic feet per second and in gallons per minute. ( 1 cu. Ft = 7.48 gal.) 5. Compute the unit weight and kinematic viscosity, in foot-pound-second units, of dry air at 15 and an absolute pressure of 14.7 lb per sq.in.
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.
3.5 kg of an ideal gas is heated at constant temperature from 15 m3 and 4.0 atm to 35 m3 at Determine the work done
Civil engineering: Energy Please solve the problem clearly , don't use previously solved solutions. I am asking this for a second time. Hope you understand Question: The atmosphere is stable with a lapse rate of -0.2 degree C/100 m. The surfaces air temperature is 15 degree C. A parcel of air is released at the ground with a temperature of 25 degree C. Calculate the maximum mixing height, in m.
A 35 hp air compressor handles 300 ft3/min of air with a density of 0.079 lbm/ft3 and pressure of 14.7 psia, and discharges at a pressure of 75 psig with a density of 0.305 lbm/ft3. The change in specific internal energy across the compressor is 35 Btu/lbm. Neglecting the changes in kinetic and potential energies, calculate (a) work in Btu/lbm (b) the heat transfer in Btu/lbm
An open cylindrical tank 800mm in diameter and 2000mm high contains water to a depth of 1.6m. It is rotated about its vertical axis at 13 rad/s. How many liters of water are spilled? Use density of water as 1000kg/m3 and specific weight as 9.81kN/m3
We have exposed 1 kg of water, 1 kg of brick, and 1 kg of concrete each to a heat source that puts out 100 J every second. Assuming that all of the supplied energy goes to each material and they were all initially at the same temperature, which one of these materials will have a greater temperature rise after 10 s? We can answer this question using Equation as shown . We will first look up the values of the specific heat for water, brick, and concrete, which are cwater = 4180 J⁄kg K, cbrick = 960 J⁄kg K and cconcrete = 880 J⁄kg K . Now applying as shown , Ethermal = mc(Tfinal Tinitial) to each situation, it should be clear that although each material has the same amount of mass and is exposed to the same amount of thermal energy, the concrete will experience a higher temperature rise because it has the lowest heat capacity value among the three given materials.
A sluice gate, as shown in Figure Q1, is used to control the upstream water level in a4 m wide rectangular channel. The water discharge in the channel is 12 m3/s. Given the water depth at 1 is 2.4m use the Specific Energy equation to findthe water depth (to 1 decimal place) at 2.
Convert a pressure head of 10 m water column to kerosene of specific gravity equal to 0.8 and to Carbon tetrachloride of specific gravity 1.6