Q.2: A refrigeration system using refrigerant 22 is to have a refrigerating capacity of 80 kW. The cycle is a standard vapor-compression cycle in which the evaporating temperature 42°C. is -8°C and the condensing temperature (a) Determine the volume flow of refrigerant measured in cubic meters per inlet at the second to the compressor. (b) Calculate the power required by the compressor. (c) At the entrance to the evaporator what is the fraction of vapor in the mixture.

A refrigeration technician had to say ;"Absorption refrigeration systems are cost effective in ice making compared to vapor compression systems".as an industrial engineer ,evaluate this statement with the aid of relevant schematic and property diagrams

A refrigeration system with a capacity of 10 tons of refrigeration, operates at 210 kPa in the evaporator, while in the condenser it is 800 kPa. If R-134a refrigerant is in a saturated state, calculate the theoretical power required to operate the compressor. Compressor power = .... kW

A vapour-compression refrigeration system operates with Refrigerant 134 with two evaporators with varying cooling capacity. The low temperature evaporator (#1) operates at -20°C with saturated vapour at its exit and has a refrigeration capacity of 3 tons. The higher temperature evaporator (#2) produces saturated vapour at 3.6 bar at its exit and has a refrigerating capacity of 2 tons. Compression is isentropic to the condenser pressure of 12 bar. There are no pressure drops in the flow through the condenser and the two evaporators and the refrigerant leaves the condenser as saturated liquid at 12 bar. Determine: The mass flow rate of the refrigerant in kg/s through each evaporators;The power input for the compressor, in kW;The coefficient of performance of this refrigeration system;The heat transfer through the condenser in kW;The rates of exergy destruction in each expansion valves in kW for T0 = 300K;Draw the T-s diagram of this system.

Refrigerant 22 is the working fluid in a Carnot vapor refrigeration cycle for which the evaporator temperature is -30°C. Saturated vapor enters the condenser at 36°C, and saturated liquid exits at the same temperature. The mass flow rate of refrigerant is 10 kg/min. Determine the rate of heat transfer to the refrigerant passing through the evaporator, in kW, (A) 22.4 B 23.3 26.12 (D) 24.4

A split air conditioning unit operating on vapor compression cycle uses Refrigerant (R-134a). The various state points of refrigerant (R-134a) are shown on the TS diagram. Determine the following a) The refrigerating effect 3 (b) Compressor work 3 (c) The heat rejected in the condenser 2 (d) The COP of heating 2 (e) The tonnage capacity of the unit for the refrigerant mass flow of 0.025 Kg/s.

. A two-stage cascade system uses ammonia as the refrigerant. The evaporator is at -30OC temperature and the condenser in the high-pressure system is at 1514.3 kPa pressure. The cascade condenser is a direct contact type and has a refrigeration load of 100 TR. Determine: a) The mass flow rate of refrigerant in the low pressure and the high pressure systems. b) The total power required c) The heat removed in the condenser d) The COP of the system

A standard vapor-compression refrigeration system produces 20 tons of refrigeration using R 12 as a refrigerant while operating between a condenser temperature of 40°C and an evaporator temperature of -25°C. Determine the following: a. refrigerating effect in kilojoules per kilogram, b. the circulating rate of R 12 in kilograms per second, c. the power required, the COP, d. the heat rejected in kilowatts, and e. the volume flow rate of refrigerant at compressor inlet conditions. HA 40°C -25°C Entropy s Temperature T

Steam is supplied to a two-stage turbine at 48 bar and 400 °C. It expands in the first turbine until it is just dry saturated, then it is re-heated to 400 °C and expanded through the second-stage turbine. The condenser pressure is 0.04 bar. High-P turbine Low-P turbine Reheater - Boiler P4= P3 = Preheat Condenser Determine thespecific work outputof the system to 3 d.p.?

A food product with 80% moisture content in a 7 cm diameter can wants to be frozen. product density is 1000 kg / m³ thermal conductivity is 1.0 W / (m K) and initial freezing temperature is -2.25 degrees Celsius after 8 hours in freezing medium -35 degrees Celsius Temperature to -10 degrees Celsius estimate convection heat transfer coefficient freezing medium assume the can as an infinite cylinder h =