3.) An ammonia compressor operates at evaporator pressure of 316.02 kPa and a condenserpressure of 1557 kPa. A twin-cylinder compressor with bore to stroke ratio of 0.85 is toused at 1200 rpm. The actual volumetric efficiency is 92% and compression and mechanicalefficiency is 78% and 80% respectively. For a cooling capacity of 25 TR, (a) the sketch thep-h diagram labeling the evaporating and condensing temperature and pressures (b) definethe all properties of ammonia taken from saturation table. Determine (c) the quantity ofcooling water in the condenser in kg/min if the increase in temperature is 8°C, (d) the boreand stroke expressed in cm and (e) the size of the driving motor in hp.Given: h2 = h at 1557 kPa and s2 = s11695 kJ/kg

Answered: 3.) An ammonia compressor operates at…

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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a freon 12 vapour compression system operating at a condenser temperature of 40 degree centigrade and an evaporative temperature of 0 degree centigrade develops 15 tons of refrigeration. using P-H diagram for freon 12, determine, a. the discharge temperature and mass flow rate of the refrigerant circulated, b. the teoretical piston displacement of the condenser and piston displacement per ton of refrigerant c. the theoretical horsepower of the compressor and horsepower per ton of the refrigerant d. the heat rejected in the condenser, and e. the Carnot COP and actual COP of the cycle.
Provide the evidence of describing how the reciprocating air compressors (applicable to a particular purpose) may be used to save energy cost and still prevent disadvantages on other
A simple vapour compression plant produces (5 tonnes) of refrigeration. The enthalpy values at inlet to compressor, at exit from the compressor, and at exit from the condenser are (183.19, 209.41 and 74.59 kJ/kg) respectively. Determine :- (i) The refrigerant flow rate, (ii) The C.O.P. (iii) The power required to drive the compressor. (iv) The rate of heat rejection to the condenser.
Q3: Explain in detail the differences between vapor compression systems and evaporative cooling systems. This comparison should present advantages, disadvantages, potential applications, and suitability of each system to the climate conditions of Iraq.
4. The condensing pressure for a Rankıne engine Is I Calculate the net work for 1 kg of steam and the thermal efficiency when the steam at the beginning of expansion is at 50 bar and (a) saturated, (b) 350°C, and (c) 640°C. Ans. (a) 627.2 kJ/kg, 26.4%; (b) 727.3 kJ/kg, 27.5%; (c) 1079.49 kJ/kg, 32.35% ot 2 15 MPà
I have step by step but I don’t know how to read table and values ! Help with final calculations
回MO zain IQ Asiacell The thermodynamic properties of refrigerant R22 mixture of liquid and vapor leaving the expansion device and entering the evaporator are; pressure of 498 kPa, temperature of O °C, fraction dryness (x) of 0.238, saturated liquid enthalpy of 200 kJ/kg, and saturated vapour enthalpy of 405 kJ/kg. The pressure of this refrigerant at the entrance of the condenser is measured to be 19.3 bar. After the subcooling process, the enthalpy in (kJ/kg) and the pressure in (MPa) of this refrigerant have been measured and were found to be 199.47 kJ/kg and 2.3 MPa none of these answers. 199.47 J/kg and 2.3 Pa 239. 68 kJ/kg and 1.96 MPa 248.79 J/kg and 1.93 Pa 248.79 kJ/kg and 1.93 MPa
A plant using R134a refrigerant has a cooling capacity of 352 kW of refrigeration. It evaporates at 0 Cand condenses at 35 C, with the 5 of superheat at the evaporator outlet and 5 K of sub-cooling at the condenser outlet. Assuming isentropic compression and ignoring pressure drops in the piping, the evaporator and condenser, determi the following; a) The refrigeration effect b) The mass flow rate of refrigerant ) The compressor power d) The rate of heatrejection at the condenser e) The COP 0 The corresponding Carnot COP g) The percentage Carnot-efficiency
1.) Determine the refrigerant name and chemical formula of R-22 2.) An ice plant produces 20 tons of ice per day at -15oC from water at 25 oC. If miscellaneous losses are 12 % of the freezing and chilling load, calculate the refrigeration capacity of the plant, in TR.
For air properties use online source: https://www.peacesoftware.de/einigewerte/luft_e.html The compressor is operating at steady-state increasing pressure of R-22 refrigerant from 4 bars to 14 bars. Temperature was rising during the process from 12C to 90C. The inlet volumetric flow rate is 1 m3/min and inlet diameter is 0.03m. At the exit the diameter is the same. Heat flow to the surroundings can be neglected. Determine: a.Mass flow rate [kg/s] b. Inlet and outlet velocity [m/s] c.Power required to run the compressor [kW]

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