Answered: A two cascade refrigeration system uses…

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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The food storage room requires a cooling system with a capacity of 15 tons of refrigeration that operates at an evaporator temperature of -17.5 ° C and a condenser temperature of 42.5 ° C. The refrigerant used is R-134a and the system operates in saturated conditions. a. COP = b. Refrigerant flow rate = kg / s. c. Heat loss rate in the condenser = kJ / s.
A. Describe the four processes, which occur in the vapor-compression-refrigeration cycle that youtested.B. How did you figure out the enthalpy at the various entry / exit stages? (I know you lookedat the chart or table provided! I understand that you may have used interpolation.) I want you toexplain briefly how you determined, what principle(s) you used to determine the enthalpy at thevarious points.Sketch a p-h diagram. On this sketch of the p-h diagram you must sketch and show SOME constanttemperature lines, constant pressure lines, constant enthalpy lines, constant entropy lines, quality factorand other significant features of the p-h diagram to show your understanding of the p-h diagram. Labelx & y axis, indicate the units, indicate the critical point. Label various regions,
Question 2 of 4 - / 25 An office building requires a heat transfer rate of 30 kW to maintain theinsidetemperature at 21°Cwhen theoutsidetemperature is O°C. Avapor-compression heat pump with Refrigerant 134a astheworkingfluid isto beused to provide the necessary heating. The compressoroperates adiabatically with an isentropic efficiency of 82%. Determine appropriate evaporator and condenser pressures of a cyclefor this purpose assuming ATcond = ATevap = 10°C, as shown in the T-sdiagram. The refrigerantexitstheevaporator assaturated vapor and exitsthecondenser as saturated liquid at the respective pressures. AT cond Outside air 21°C 0°C Inside air ATent Condenser Evaporator Expansion valve Compressor Step 1 Determinethe mass flow rate of refrigerant, in kg/s. m = kg/s Attempts: unlimited Submit Answer Save for Later Using multiple attempts will impact your score. 5% score reduction after attempt 2 Step 2 The partsof thisquestion must becompleted in order. This partwill be availablewhen…

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