A completely insulated mixing vessel is designed to deliver water at 60 ⁰C and atmospheric pressure at a rate of 4 kg/s by mixing two streams of incoming water in an environment at 25 ⁰C. Saturated steam at atmospheric pressure is inserted on the hot side. Two options are being considered for the cold side: (a) chilled water from the plant at 3 ⁰C or (b) water from the tap at 20 ⁰C (both at atmospheric pressure). 1. Determine the thermal efficiency of each process

In the evaporator of an air conditioning system, air flows over finned tubes through with the refrigerant R134a flows. air out refrigerant in refrigerant out air in The mass flow rate of the air is 0.75 kg/s and the air enters at 40°C and pressure 1.04 bar. The air leaves the evaporator at 25°C and 1.01 bar. The refrigerant enters the evaporator with a quality of 0.2 and a temperature of 12°C. The refrigerant exits as saturated vapor. Obtain the properties of air and R134a using the fluids "Air" and "R134a" in EES. What is the volumetric flow rate of the air entering the heat exchanger (m^3/s)? Determine the rate of heat transfer from the air to the refrigerant (W). Determine the mass flow rate of the refrigerant (kg/s).

A single effect evaporator was used to concentrate 8000 kg / hr of tomato juice from 5% total solids to 30% total solids. The juice enters the Evaporator at 20 ° C. The evaporator is operated on Steam (80% quality) at 143.27 kPa. The vacuum in the evaporator allows the juice to boil at 75 ° C. The specific heat of the dilute material is 4.1 kJ / (kg ° C) and the concentrate product is 3.1 kJ / (kg ° C). Count it (a) Steam demand rate = Answerkg / hour. b. Steam economy when condensate temperature is released at 75 ° C. = Answer(kg of water evaporated / kg of steam)

I. In an air conditioning unit, 3.5 m³/s of air at 27°C dry bulb temperature 50%RH at 100.325 kPa barometric condition enters the Airconditioned Unit (ACU). The leaving condition of the air is 13°C dry bulb and 90% RH. Determine: a. Sensible Heat that was being removed/ added from the ACU? b. Moisture that is being removed/added from the air leaving ACU?