. Applied thermodynamics for engineers. performancemay be excelled by a compression plant. 25. Find a relation between coefficient of performance and ice-melting effect at the compressor cylinder. 26. Find the tonnage on tlie standard basis of a 12 x 30 inch double-acting compressor at 60 r. p. m., using (a) ammonia, (6) carbon dioxide. 27. Find the tonnage rating for an ammonia absorption apparatus work-ing between 30 and lb. pressure with 10,000 lb. of dry vapor entering the gen-erator per hour, 28. Check all derived values in Art. 660 to Art. 663. PROBLE
. Applied thermodynamics for engineers. performancemay be excelled by a compression plant. 25. Find a relation between coefficient of performance and ice-melting effect at the compressor cylinder. 26. Find the tonnage on tlie standard basis of a 12 x 30 inch double-acting compressor at 60 r. p. m., using (a) ammonia, (6) carbon dioxide. 27. Find the tonnage rating for an ammonia absorption apparatus work-ing between 30 and lb. pressure with 10,000 lb. of dry vapor entering the gen-erator per hour, 28. Check all derived values in Art. 660 to Art. 663. PROBLEMS 491 29. Compare the coefficients of performance, in Art. 632 and in Troblem 8, withthose of the corresponding Carnot cycles. 30. Compute the value of X in Art. 658. 31. Compute as in Art. 632 the results for carbon dioxide. Why might not etherbe included in a similar comparison ? 32. Ether at 52^ F. is compressed adiabatically to 232° F., becoming wholly was its initial condition ? (Fig. 315.) PRESSURE^ LBS. ENTROPY Fig. 315. —Entropy Chart for Ether. 33. Discuss variations with temperature of the total heat of ammonia, sulphurdioxide, carbon dioxide. (See tables, pp. 422-424.) 34. Plot a total-heat entropy diagram for carbon dioxide. 35. Find the ratio cubic inches of piston displacement per minute ^^^. ^^^^ rated tonnagetemperature limits, with vapor dry at the beginning of compression. (Art. 650.) 36. Find a general expression for the coefficient of performance in the Joule cycle,the paths not being adiabatic. 37. Discuss the economy and general desirability of using the exhaust steam fromthe engine driving an ammonia compressor, to distill in vacuo the water from which iceis to be made. 492 APPLIED THERMODYNAMICS SBIAiniOA OlJIO^dS 6 o ° ^a o --< H k ^ .^ 5^ --^ ^^ ^ d -^ ^ ^- ^ ^ , ^ ^^ ^ ^ r ., ..^ ■^ ^^ X > , ^^ .^ y d ->, £ ^ yi-^ cr ^ ^ ^ ?- b^ \ j \ y ^^ -S ^ O/ ^ f w < d ^
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