Why is multistage system essential for vapor compression system? Explain the two stage compression system with water inter cooler and a liquid flash chamber. Draw also P-h and T-s diagram.
Calculate the power required to compress 15 kg/min of ammonia from saturated vapor at 1.3 bar to a condensing pressure of 10 bar by two stage compression with inter cooler by liquid refrigerant at 4.5 bar. Assume saturated liquid to leave the condenser and dry saturated vapors to leave the compressor. Use P-h chart. Determine also the power required when inter cooling is not employed.
Mention advantages of multistage compression with intercooler. Explain three stage compression with intercooler providing proper figure, p-h diagram and mathematical expression.
The refrigeration system using R-12 as refrigerant consists of three evaporators of capacities 20 TR, 30TR and 10TR with individual compression valves and individual compressors. The temperature in the evaporators is to be maintained at -10° C, 5°C and 10°C respectively. The vapors leaving the evaporators are dry and saturated. The condenser temperature is 40°C and the liquid leaving the condenser is subcooled to 30°C. Assuming isentropic compression in each compressor, find (i) the mass of refrigerant flowing through each evaporator; (ii) the power required to drive the system and (iii) COP of the system.
Mention advantages of multistage compression system with intercooler. Explain 3 stage compression with water intercooler providing proper figure P−hP-hP−h diagram and mathematical expressions.
A vapor compression system with Ammonia as refrigerant works between the pressure limits of 2 bar and 12 bar with 3 stage compression, The vapour leaving the water intercoolers at pressures 4 bar and 8 bar are in a saturated state. If the load is 10 TR, find the power required to drive the three compressors and compare the COP of this system with that of a simple saturation cycle working between the same overall pressure limits.
What are the advantages and disadvantages of vapor compression refrigeration system over air refrigeration system?
Why is multi pressure system needed in vapor compression system? Explain the working principle of a two-stage compression system with water intercooler, liquid intercooler and a liquid flash chamber. Draw P-v and T-s diagram.
Calculate the power needed to compress 20 kg/min of ammonia from saturated vapor at 1.4 bar to a condensing pressure of 10 bar by two-stage compression with intercooling by liquid refrigerant at 4.0 bar. Assume saturated liquid to leave the condenser and dry saturated vapors to leave the evaporator. Use the P-h chart.
Why is multi pressure system important in vapor compression system? Explain the working of a two stage compression system with water inter cooler, liquid inter cooler and a liquid flash chamber. Draw P-h and T-S diagram.
Calculate the power needed to compress 20 kg/min of ammonia from saturated vapor at 1.4 bar to a condensing pressure of 10 bar by two-stage compression with inter cooling by liquid refrigerant at 4 bar. Assume saturated liquid to leave the condenser and dry saturated vapors to leave the compressor. Use the P-h chart. Determine also the power required when inter cooling is not employed.