A simple DC motor has a coil of wire that can rotate in a magnetic field. The current in the coil is supplied via two brushes that make moving contact with a split ring. The coil lies in a steady magnetic field. The forces exerted on the current-carrying wires create a torque on the coil.
Source: Railway and Locomotive Engineering, The 120-Ton Coal Cars of the Virginian Railway (April, 1921) in contrast to the Norfolk and Western 100-ton coal hopper, there were no hopper doors on the bottom of the Virginian's 120-ton coal cars because they were tilted sideways when unloaded at Sewells Point
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The ton of refrigeration is equal to 288,000 Btu. This may be calculated by multiplying the weight of ice (2,000 lb) by the latent heat of fusion (melting) of ice (144 Btu/lb). Thus. 2.000 lb x 144 Btu/lb = 288,000 Btu. in 24 hours or 12,000 Btu per hour (288,000 / 24). Therefore, one ton of refrigeration = 12,000 Btu/hr. SUMMARY
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1 ton (12,000 BTU) 1 1 5 3 3 1 33 22 19 10 2.5 2 ton (24,000 BTU) 2 2 10 7 6 3 67 44 38 19 5 3 ton (36,000 BTU) 3 3 15 10 8 4 100 67 58 29 7.5 4 ton (48,000 BTU) 4 4 20 13 11 6 117 78 67 34 10 5 ton (60,000 BTU) 5 5 25 16 14 7 145 97 84 42 12.5 7.5 ton (85,000 BTU) 7.5 7.5 37 24 21 11 219 146 126 63 17
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ing coils – some are packaged in a single housing, oth-ers are split (evaporator coil remote to condenser and compressor). High-efficiency chillers can produce chilled water using less than 0.50 kW per ton of cooling capac-ity. A refrigeration system must also reject the heat that it removes using a cooling tower for water cooling the
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The coil in fact “channels” a strong magnetic force in the the windings when the coil is energised, i.e. when electric cur-rent flows through it. The coil consists of capillary copper wire wound on a sup-port reel. When electric current is fed into the coil, magne-tic flow lines are generated, which are stongest in the cen-tre of the coil.