Refrigerant-134a enters the condenser of a steady-flow Carnot refrigerator as a saturated vapor at 65.0 psia, and it leaves with a quality of 0.05. The heat absorption from the refrigerated space takes place at a pressure of 30 psia. Determine the quality at the beginning of the heat-absorption process. (Round the final answer to three decimal places.) The quality at the beginning of the heat-absorption process is

Refrigerant 134a enters the condenser of a residential heat pump at 900 kPa and 40 degrees C at a rate of 0.02 kg/s and leaves at 900 kPa as a saturated liquid. If the compressor consumes 1.2 kW of power, determine the COP of the heat pump and the rate of absorption from the outside air.

Consider a condensing heat exchanger operating with two separate fluids, R-134a and the water. Assuming the operating conditions listed in the table below, and that the pressure drop of the fluids are negligible, find the mass flowrate of the water (kg/s) and Q (kW) transferred between the R-134a and the water. m Enters Exits Fluid Water ? Liquid at T₁ = 5 °℃ Liquid at T₂ = 25 °℃ T2 = 35 °C R-134a 10 kg/min P₁ = 1 MPa and T₁ = 70 °C

Nitrogen gas at 90° F (MW=28) goes through a compressor, increasing its pressure from 10 psi to 65 psi. The temperature remained constant throughout. Determine the work in Hp for a steady flow process; ΔKE=0, ΔPE=0; mass flow rate of nitrogen is 2 lbm/min. Round up to 4 decimal places. Draw and label the P-V and T-S diagrams.

In a household refrigerator, the condenser is vertically mounted at the outer backof the unit, the freezer (evaporator) on the topmost compartment, and thevegetable compartment at the very bottom. Explain why?

Refrigerant vapor rejects 70 kW of heat as it passes through an air-cooled condenser. The condenser has an air-side area of 210 m2 and, based on this area, has an overall heat transfer coefficient of 0.037 kW/m2∙°C. Cooling air flows at a rate of 7.59 kg/s. If condensation of the refrigerant occurs at 55°C, what is the inlet temperature (in °C) of the air? Take the specific heat of air to be 1.02 kJ/kg∙°C.   Round your answer to 2 decimal places.

It is insulated against heat, except for a cylinder base B with a volume of 100 liters. This cylinder It is divided into two compartments by a heat-proof and frictionless piston. 100 kPa pressure in chamber A and air at 20 oC temperature, and neon gas at 30 oC in compartment B. Initially the volumes of both compartments are equal. Compartment A at 800 kPa and 20 oC inside it is connected to a pipe with air flow. The valve opens and when the pressure in chamber A reaches 800 kPa is closed. In compartment B, neon gas is inverted and the temperature changes in a steady state. a) Neon's final volume and compression work b) The temperature and mass of the air in the final chamber A c) Calculate the total entropy change of the entire system.

Solve the following problems: Note: Draw the p-h diagram completely labeling the respective refrigerant conditions (pressures and temperatures) and define the properties of refrigerant (enthalpies and specific volume) needed to solve the respective problems. In an ammonia refrigeration system, the capacity is (1) 210 kW at a temperature of-20°C. The vapor from the evaporator is pumped by one compressor to the condensing pressure of 1431 kPa. Later, the system was revised to a two-stage compression operating on the cycle shown below with intercooling but no removal of flash at 555 kPa. (а) Calculate the power required by the single compressor in the original system. (b) Calculate the total power required by the two compressors in the revised system. Condenser 1431kPa High-stage compressor Intercooler 555kPa Evaporator 2í0kW -20°C Low-stage compresaor

In a closed feedwater heater, steam warms the feedwater and the condensate leaves the heater through a trap or throttling value . What is the purpose of the trap or throttling value? It allows the liquid to flow to higher pressures with the same internal energy.   It separates the liquid from the vapor.   It allows the liquid to flow into a lower pressures without the loss of enthalpy.   It allows the liquid to flow to higher pressures with the same enthalpy.   It allows the liquid to flow into a lower pressures without the loss of internal energy.

The maximum efficiency of a heat engine works between 660 K and 323 K is