Condensing pressure is 1200 kPa. Refrigerant vapor exits evaporator no. 1 with a 10- degree superheat. Saturated conditions exist at the exits of the evaporator no. 2 and evaporator no. 3. Liquid refrigerant leaves the condenser at 28°C. Determine a. the mass flow rate in evaporator 1 kg/s b. the mass flow rate in evaporator 2 kg/s c. the mass flow rate in evaporator 3 kg/s
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- Figure below shows a steam jet refrigeration system that produces chilled water in a flash chamber. The chamber is maintained at a pressure by the steam ejector, which removes the vapor generated by entraining it in the low-pressure jet and discharging into the condenser. The vacuum pump removes air and other non-condensable gases from the condenser shell. For the conditions shown on the figure, determine the make-up water and cooling water flow rates in kg/hr. Show diagrams if there are anyFigure below shows a steam jet refrigeration system that produces chilled water in a flash chamber. The chamber is maintained at a pressure by the steam ejector, which removes the vapor generated by entraining it in the low-pressure jet and discharging into the condenser. The vacuum pump removes air and other non-condensable gases from the condenser shell. For the conditions shown on the figure, determine the make-up water and cooling water flow rates in kg/hr. SHOW THE NEEDED DIAGRAMS FOR THE SOLUTIONQ.1. A refrigeration process with interstage cooling uses refrigerant HFC-134a, and the outlet of the condenser is to be saturated liquid at 40°C. Refer to the following figure for stream numbers in your solution. The pressure of the flash chamber and the intermediate pressure between compressors is to be 290 kPa. The evaporator is to operate at -20°C and the outlet is to be saturated vapor. The flowrate of stream 1 is 23 kg/h. The flash chamber may be considered adiabatic. The compressors may be considered to be 80% efficient. a) What is the power input required to the first compressor? b) What are the flowrates of streams 6 and 7? What is the enthalpy of stream 4? Hot Side 6 5 Condenser 2nd Stage Compressor Throttle Valve 7 Flash Chamber Vapor Phase Only 1st Stage Compressor 8 Throttle Valve Evaporator 1 2 Cold Side
- In all liquid refrigerant lines, the pressure at the bottom of a vertical rise isgreater than the pressure at the top of the rise. For R-134a, the pressure isabout 0.5144 lb/sq in or less for every vertical foot of pipe that is used. Thevertical rise between this condenser and evaporator is 7.5 feet. How muchless is the pressure at the top of the rise than at the bottom?QI: An R-134a refrigeration system produces 10 ton of refrigerating effect at the evaporating temperature -10°C and the condensing temperature of 40°C.The absolute pressure measured at the inlet and outlet of evaporator are 2.0 bar and 1.7 bar, respectively. Considering there are no superheat and sub cooling effects, calculate the following parameters with or without a drop of pressure in the evaporator: (i) Refrigerating effect (ii) Mass flow rate (iii) Power requirement in kW/TR (iv) COPA manufacturing company is intending to use its water cooled condenser for its proposed cold storage room. The name plate of the condenser gives the following specifications: refrigerant ammonia condenser water inlet 30 OC condenser water outlet 40 ỌC condensing temperature 35 OC refrigerant flow 3.84 kg/min circulating water flow 120 kg/min If the company decided to purchase a new compressor and evaporator, find the tonnage of the system and the temperature in the evaporator, (b) what is the COP? (c) find the theoretical hp required.
- For the purpose of acting as an air-cooled water chiller, an ammonia refrigerant vapor compression system is deployed. It is functioning with an evaporator temperature of 0 degrees Celsius and a condenser temperature of 40 degrees Celsius. The refrigeration produced by the system is equal to 15 tons.Find out: a. The temperature of the discharge and the mass flow rate of the refrigerant that is being circulated.b. The piston displacement that can be considered theoretical for the compressor.c. The work that can be done by the theoretical compressor.d. The heat that is not allowed to escape through the condenser.e. The Carnot coefficient of performance and the actual COP of the cycle.f. The volume of air that is supplied in the condenser if the air comes in at 30 degrees Celsius and exits at 34 degrees Celsius.g. The LMTD and AMTD of the condenser h. The water flow rate of the chiller assuming that the water enters the evaporator at 10 degrees Celsius and exits at 5 degrees Celsiusi. The…IDENTIFY THE FF: AIRCONDITIONING AND VENTILATION 1. Acts as a master controller which keeps the system inautomatic operation2. Adds heat to a fluid3. Ratio of the actual partial pressure of the watervapor in a space to the saturation pressure of purewater at the same temperature.4. Also known as the heat content of air-vapormixture5. Temperature as read on an ordinary temperature6. Temperature where in water will start to condense7. Equipment that removes heat8. Is the process of treating air9. Their purpose is to create atmospheric conditionsfavorable to human health, comfort and efficiency.10. The system is to maintain indoor conditions forwinter seasonVariable refrigerant flow systems sense the ______and _____of the refrigerant to determine the optimal volume of refrigerant to circulate.
- The figure 1 above presents a crudely simplified centralised water heating system. The system comprises of two heating lines, the first line having one radiatorand the second has four radiators in series.The pressure after the pump (point (1)) is 2 bar, and the flow velocity is 1.2 m/s. For simplicity we can assume the water to be in constant temperature of 60◦C. Loss coefficients and pressure losses are listed in Table 1, and pipe lengths and diameters are given in Table 2.For the system balancing, the target is to divide the mass flow so, so that 20% of the mass flow goes to the first line (i.e. through radiator R1.1) and 80% of the flow goes to the second line (R2.1 - R2.4):(a) How large pressure loss is needed in the control valve CV1 to get the desired flow rates in the two lines? (b) How large is then the minor loss coefficient of the said valve, KCV1? (c) How much is the pressure, in bar, at the end of the line at section 4?In actual design, as per illustration Fig. MT 1, the system has a liquid reservoir also acting as an accumulator. The line that connects to the thermal expansion valve is connected underneath the accumulator. This will ensure that only ___ refrigerant will be atomized by the value supplied to the evaporator. SUBJECT: REFRIGERATION SYSTEMS2- The following data relate to a two-pass surface condenser: Steam condensed = 1540 kg/hr Temperature of cooling water when it enters the condenser = 15° C Temperature of cooling water when it leaves the condenser = 30 ° C Vacuum in the condenser = 675 mm of Hg Barometer reading = 750 mm of Hg Temperature of condensate = 32 ° C Quality of exhaust steam = 0.92 Water velocity in tubes = 2.6 m/s Outside diameter of tubes = 2.8 cm Thickness of tubes = 0.03 cm Heat Transfer coefficient = 3.35 kJ/h/cm Determine Area of the tube surface required а- b- No. of tubes c- Length of tubes