A manufacturer in the U.S. wants to sell a refrigeration system to a customer in Germany. The standard measure of refrigeration capacity used in the United States is the ‘ton’; a one-ton capacity means that the unit is capable of making about one ton of ice per day or has a heat removal rate of 12,000 Btu/hr. The capacity of the American system is to be guaranteed at 3 tons. What would this guarantee be in SI units?
GIVEN
- A three-ton refrigeration unit to be sold in Germany
FIND
(a) The rating in SI units
Converting the refrigeration capacity to SI units we have
Although the watt is a derived unit in the SI system, it would be used to express the capacity of the
system rather than Newton meters per second.
You might also like to view...
A diffraction grating has 300 lines per mm. If light of frequency 4.76 × 1014 Hz is sent through this grating, at what angle does the first order maximum occur? (c = 3.00 × 108 m/s)
A) 56° B) 44° C) 22° D) 11° E) 28°
When a bar magnet is thrust into a coil of copper wire, the coil tends to
A) attract the magnet as it enters. B) repel the magnet as it enters. C) both of these D) neither of these
Betelgeuse is the bright red star representing the left shoulder of the constellation Orion. All the following statements about Betelgeuse are true. Which one can you infer from its red color?
A) It is much brighter than the Sun. B) Its surface is cooler than the surface of the Sun. C) It is much more massive than the Sun. D) It is moving away from us.
The absolute moisture content of the air is 7.7 g/ft3 on a day when the air temperature is 75°F. What is the relative humidity?