Refrigerant 12 Condensing temperature = 46.2 oC Evaporating temperature = -3 oC Temperature of the suction vapor = -15.6oC Refrigerating Capacity for evaporator = 44 TON Determine the COP
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Refrigerant 12
Condensing temperature = 46.2 oC
Evaporating temperature = -3 oC
Temperature of the suction vapor = -15.6oC
Refrigerating Capacity for evaporator = 44 TON
Determine the COP
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- With suitable block-diagram, compare vapour-compression and vapour-absorption refrigeration systems.2. Double-Effect Evaporator with Reverse Feed. A feed rate of 20410 kg/hr of 10 wt % NaOH solution at 48.9 °C is being concentrated in a double-effect reverse-feed evaporator to produce a 50% solution. Saturated steam at 178.3 °C is fed to the first evaporator and the pressure in the second effect is 10.34 kPa abs. The heat-transfer coefficient for each effect is assumed to be 2840 W/m?-K. Calculate the heat-transfer area, the steam consumption rate, and the steam economy.In a certain refrigeration system for low temperature application, a two-stage operation is desirable which employs ammonia system that serves a 40 − ton evaporator at −30°C. The system uses a direct contact cascade condenser, and the condenser temperature is 40°C. Sketch the schematic diagram of the system and draw the complete process on the PH diagram b. The mass flow rate in the low loops in kg/s c. The mass flow rate in the low and high pressure loops in kg/s d. The total work
- The food storage room requires a cooling system with a capacity of 10 tons of refrigeration that operates at an evaporator temperature of -17.8 ° C and a condenser temperature of 33.9 ° C. The refrigerant used is R-717 and the system operates in saturated conditions. questions a. COP = Answer. b. Refrigerant flow rate = Answer kg / s. c. Heat loss rate in condenser = Answer kJ / s2. Explain how to increase the coefficient of performance of a single stage vapour compression system. Illustrate your analysis through charts (P-h and T-s diagrams)1. A standard refrigerating system with a heat exchanger is operating with a condenser pressure of 1571.2 kPa and evaporator pressure of 421.35 kPa using refrigerant R22. If the liquid line from the condenser is soldered to the suction line from the evaporator to form a heat exchanger and if as a result of this, the saturated vapor leaving the evaporator is superheated by 10. Determine (a) temperature of refrigerant entering the compressor (b) temperature of refrigerant leaving the compressor (c) degree superheat leaving the compressor (d) temperature of subcooled liquid leaving heat exchanger (e) degree subcooled leaving the heat exchanger (f) mass of flash gas per kg refrigerant entering evaporator (g) compression ratio (h) clearance volumetric efficiency of compressor if the clearance volume is 5% 18 answers (i) refrigerating effect (i) mass flow rate of refrigerant per ton of refrigeration (k) work on compressor (1) work on compressor per ton of refrigeration (m) condenser load (n)…
- Problem 3: The high_temperature evaporator (Refrigeration capacity 5 TR) of a multi-evaporator VCR system, working with ammonia, is operating at -6°C and the low temperature evaporator (Refrigeration capacity 10 TR) is operating at -34°C. The condenser pressure is 10.99 bar. The system using individual expansion valves for each evaporator. Assuming saturated conditions at the exit of evaporators and condenser and isentropic compression: a) Find the required power input and COP if a single compressor is used. b) If individual compressors are used for both stage find the power input and COP. c) Compare both cases.1. A standard refrigerating system with a heat exchanger is operating with a condenser pressure of 1571.2 kPa and evaporator pressure of 421.35 kPa using refrigerant R22. If the liquid line from the condenser is soldered to the suction line from the evaporator to form a heat exchanger and if as a result of this, the saturated vapor leaving the evaporator is superheated by 10.The food storage room requires a cooling system with a capacity of 10 tons of refrigeration that operates at an evaporator temperature of -9.2 ° C and a condenser temperature of 28.6 ° C. The chiller used is R-134a and the system operates in saturated conditions. A. COP = Answer b. Refrigerant flow rate = Answer kg / s. c. Heat loss rate in the condenser = Answer kJ / s.
- QUIZ 2 An ideal multi-pressure refrigeration system consists of two Compressors serving one 60 Tons Evaporator at -20°C. The system uses two-stage compression with intercooling and flash Tank. A pressure reducer valve reduces the condenser pressure to intercooler pressure. The condensing temperature is 47°C. The refrigerant is R22. Calculate (a) enthalpy leaving evaporator (b) enthalpy leaving LP compressor (c) enthalpy entering HP compressorinstalling a spray condenser with a wet type cooling tower is not practical Choice. explain why?3.) An ammonia compressor operates at evaporator pressure of 316.02 kPa and a condenser pressure of 1557 kPa. A twin-cylinder compressor with bore to stroke ratio of 0.85 is to used at 1200 rpm. The actual volumetric efficiency is 92% and compression and mechanical efficiency is 78% and 80% respectively. For a cooling capacity of 25 TR, (a) the sketch the p-h diagram labeling the evaporating and condensing temperature and pressures (b) define the all properties of ammonia taken from saturation table. Determine (c) the quantity of cooling water in the condenser in kg/min if the increase in temperature is 8°C, (d) the bore and stroke expressed in cm and (e) the size of the driving motor in hp. Given: h2 = h at 1557 kPa and s2 = s1 1695 kJ/kg