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The energy consumption associated with a home water heater has two components: (i) the energy that must be supplied to bring the temperature of groundwater to the heater storage temperature, as it is introduced to replace hot water that has been used; (ii) the energy needed to compensate for heat losses incurred while the water is stored at the prescribed temperature. In this problem, we will evaluate the first of these components for a family of four, whose daily hot water consumption is approximately 100 gal. If groundwater is available at 15°C, what is the annual energy consumption associ- ated with heating the water to a storage temperature of 55°C? For a unit electrical power cost of $0.18/kW · h, what is the annual cost associated with supplying hot water by means of
(a) electric resistance heating or
(b) a heat pump having a COP of 3.
a moving particle has coordinates in millimeter which vary with the time t in seconds according to r2t2-4ti 3t2 -t33j
Determine the maximum theoretical rate of heating provided by a heat pump, in kW per kW of power input, in each of two cases: The role of the cold reservoir is played by (a) the atmosphere at 2208C, (b) ocean water at 58C.
An angular contact thrust bearing consists of 18 balls, each of diameter 10 mm, and is mounted on a shaft that rotates at 1500 rpm. If the contact angle of the bearing is 40° with a pitch diameter 80 mm, find the frequencies corresponding to cage,..
The paint on the rotating disk is worn off by dust in the air, exposing the base metal, which has an emissivity of s = 0.10. Determine the total power dissipated from the disks worn top surface.
Determine the angle between the two vectors r1 and r2. Determine the projection of the force F along the position vector r1.
For a tall column resting on the ground, axial stress develops due to the columns weight. (a) Derive the stress as a function of position z measured from the bottom of the column, and the total contraction of the column.
Obtain all appropriate differential equations, stressdisplacement relations, and all boundary conditions.
An accident occurs when car A rear-ends car B at a stoplight. The mass of car A is 1500kg and the mass of car B is 1000 kg. Car B was initially at rest with the brakes locked. Skid marks indicate car B slid 12 m after the impact. Assuming that the co..
when x 10 ft the crate has a speed of 20 fts which increasing at 6 fts2. determine the dirction of the crates velocity
consider refrigerant r-134a flowing in a smooth horizontal 10-mm-inner-diameter tube of wall thickness 2 mm. the
a bar and fulcrum lever is being used to lift a 100lb rock. the lever is 10ft and the fulcrum is 2 ft from the rock.
a velocity field in cartesian coordinates is given by uv cos theta vv sin theta and w0 where v and theta are constants.
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