PROBLEM 2 A system consisting of 2 kg of water initially at 160°C, 10 bar, undergoes an intemally reversible, isothermal expansion during which there is energy transfer by heat into the system of 2700 kJ. Determine the final pressure, in bar, and the work, in kJ.
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- compressing it isothermally. Determine the required change in pressure. 2-45 Saturated refrigerant-134a liquid at 10°C is cooled to 0°C at constant pressure. Using coefficient of volume expan- sion data, determine the change in the density of the refrigerant.Problem 1 A vertical glass cylinder contains 900 ml of water at 10 °C; the height of the water column is 90 cm. The water and its container are heated to 80 °C. Assuming no evaporation, what will be the height of the water if the coeffi- cient of thermal expansion for the glass is 3.6 x 10°C-¹? is 90 L at 26Determine the temperature rise of 20.615°F in the water-cooled condenser in °C.
- Water is pumped from a large reservoir to a storage tank 30m above via a constant diameter pipe. The volumetric flow rate during pumping is 55 L/s. This is found to require 25kW of electrical power input to the motor driving the pump. The top of the storage tank is open to the atmosphere. The water density, p=1000kg/m³, and the absolute viscosity, u=1mPa.s. Determine: a) The overall efficiency of the pump-motor unit if all frictional losses in the pipes are neglected. b) The pressure difference between the inlet and the exit of the pump for the same case as part a). c) Frictional losses in the pipe are found to be significant. If the length of pipe between the pump and the storage tank is 130m, the pipe diameter is 20cm, and the surface roughness is 0.4mm, determine a more accurate estimate for the overall efficiency of the pump-motor unit. Minor losses can be neglected.1. A thin wall double tube heat exchanger should be used to cool oil (Cp = 2200 J / Kg * K) from 149 ° C to 40 ° C, with a mass flow of 2.3 Kg / s, using water ( Cp = 4180 J / Kg * K) that enters at 20 ° C, a ratio of 1.5 Kg / s. The diameter of the tube is 12cm and its length is 61 meters. Determine the total heat transfer coefficient of this exchanger applying a) the LMTD method and b) the NTU method2.6 An open tank contains water upto a de pth of 2 m and above it an oil of sp. gr. 0.9 for a depih of 1 m. Find the pressure intensity (i) at the interface of the two liquids, and (ii) at the bottom of the tank.
- A Carnot vapor refrigeration cycle operates between thermal reservoirs at 7°C and 28°C. The working fluid is saturated vapor at the end of the compression process and saturated liquid at the beginning of the expansion process. Determine the operating pressures in the condenser and evaporator, in bar, and the coefficient of performance for each of the following as the working fluid. (a) Refrigerant 134a (b) Refrigerant R22 (c) water (d) ammoniaProblem 7-72 What is the Air at 1500 kPa absolute flows in a 25-mm-diameter tube. maximum laminar flow rate. Use density of air = 14.04 kg/m³ and μ = 0.0000217 Pa-s. Ans: 0.061 L/s17. A cylinder of 0.9 m in volume contains air at 0°C and 39.24 N/cm absolute pressure. The air is compressed to 0.45 m. Find () the pressure inside the cylinder assuming isothermal process, () pressure and temperature assuming adiabatic process. Take k = 1.4 for air. [Ans. (1) 78.48 Ncm, (i) 103.5 N/m, 140°C]
- A reversible refrigeration cycle operates between cold and hot reservoirs at temperatures Tc and TH, respectively. (a) If the coefficient of performance is 10 and Tc = -40°F, determine TH, in °F. (b) If Tc = -15°C and T₁ = 30°C, determine the coefficient of performance. (c) If Qc = 500 Btu, QH = 1000 Btu, and Tc = 20°F, determine TH, in °F. (d) If Tc = 30°F and TH = 100°F, determine the coefficient of performance. (e) If the coefficient of performance is 5.5 and Tc = -5°C, find Tâ, in °C. Part A If the coefficient of performance is 10 and Tc = -40°F, determine TH, in °F. TH= i °FA long rectangular bar (cross section size: 0.36 m x0.13 m, k = 57 W/m K, a= 4.40x10 m/s) is initially at 230°C and is suddenly exposed to a convective environment at 29°C. The heat transfer coefficient is h=35 W/m K. Estimate the temperature at the center of the bar after 10 minutes. How much heat has been lost per unit length from the bar?Water in a 35-cm dia. has 62°F temperature and the discharge is measured as 0.3 m/s and the pressure of 200 Pa. The elevation of the center of the pipe is at 10.5 m a.m.s.l. What is the total energy of the flow? Is the flow laminar or turbulent? Viscosities of Water and Air