An ice maker operating at steady state makes ice from liquid water at 32°F. Assume that 144 Btu/lb of energy must be removed by heat transfer to freeze water at 32°F and that the surroundings are at 74.50°F. The ice maker consumes 1.4 kW of power. Determine the maximum rate that ice can be produced, in lb/h, the corresponding rate of heat rejection to the surroundings, in Btu/h,

An ice maker operating at steady state makes ice from liquid water at 32°F. Assume that 144 Btu/lb of energy must be removed by heat transfer to freeze water at 32°F and that the surroundings are at 74.50°F. The ice maker consumes 1.4 kW of power. Determine the maximum rate that ice can be produced, in lb/h, the corresponding rate of heat rejection to the surroundings, in Btu/h,

College Physics

11th Edition

ISBN:9781305952300

Author:Raymond A. Serway, Chris Vuille

Publisher:Raymond A. Serway, Chris Vuille

Chapter1: Units, Trigonometry. And Vectors

Section: Chapter Questions

Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...

See similar textbooks

Similar questions

By jogging, a girl is converting food energy into internal energy at the rate of 399 kcal/h above her basal metabolic rate (BMR). Some of this additional internal energy immediately goes into work done at a rate of 56.1 W. The rest of this additional energy would go into raising her temperature, but it is instead eliminated by evaporation of perspiration to keep her body temperature constant. Assume that the heat of evaporation of water at body temperature is equal to its heat of vaporization at 100°C. (a) Determine the hourly rate (in kg/h) at which water must evaporate from her skin. kg/h (b) When fat is metabolized, hydrogen atoms in fat molecules are transferred to oxygen to form water. Assume that the metabolism of 1.00 g of fat generates 9.00 kcal of energy and produces 1.00 g of water. What percent of the water needed is generated by burning fat?
A nuclear power plant operates at 75 % of its maximum theoretical (Carnot) efficiency between temperatures of 645 °C and 380 °C. 1. If the plant produces electric energy at the rate of 1.6 GW, how much exhaust heat is discharged per hour?
A monatomic ideal gas initially fills a V0 = 0.35 m3 container at P0 = 75 kPa. The gas undergoes an isobaric expansion to V1 = 1.5 m3. Next it undergoes an isovolumetric cooling to its initial temperature T0. Finally it undergoes an isothermal compression to its initial pressure and volume. 1. Calculate the heat absorbed Q2, in kilojoules, during the isovolumetric cooling (second process). 2. Calculate the change in internal energy by the gas, ΔU2, in kilojoules, during the isovolumetric cooling (second process). 3. Calculate the work done by the gas, W3, in kilojoules, during the isothermal compression (third process). 4. Calculate the change in internal energy, ΔU3, in kilojoules, during the isothermal compression (third process). 5. Calculate the heat absorbed Q3, in kilojoules, during the isothermal compressions (third process).
You wish to chill 12 cans of soda at 25.0 °C down to 5.0 °C beforeserving them to guests. Each can has a mass of 0.354 kg, and thespecific heat of soda is the same as that of water. (a) How muchthermal energy must be removed in order to chill all 12 cans?(b) If the chilling process requires 4.0 h, what is the average rate(in W) at which thermal energy is removed from the soda?
A closed system undergoes a process in which there is no internal energy change. During this process, the system produces 1.13106 1bf·ft of work. Calculate the heat transfer for this process, in Btu.
An air conditioner with refrigerant 134a is used as a working fluid to maintain a room at 23oC by rejecting the waste heat to the outside air at 37oC.The room gains heat through the walls and windows at a rate of 250 kJ/min, while the heat generated by the computer, TV and lights is 900 W.The refrigerant enters the compressor at 400 kPa as saturated steam at a rate of 200 L/min and exits at 1,200 kPa and 70oC.Determine a) the actual COP, b) the maximum COP and c) the minimum volumetric flow of the coolant at the compressor inlet for the same compressor input and output conditions.
Water vapor enters the turbine at a pressure of 6 MPa, a mass flow of 400 kg/s and a temperature of 500 °C. It leaves the turbine as 8 kPa saturated steam. The heat transfer from the turbine to the environment is 180 °C at an average surface temperature of 8 MW. The kinetic and potential energy effects are negligible. a) Calculate the power and exergy dissipation in MW for a control volume surrounding the turbine. b) If the turbine is located in a facility where the ambient temperature is 27 °C, determine the exergy destruction for an enlarged control volume containing the turbine and its immediate surroundings. dead state; T0=300 K, P0=100 kPa
2m' of water is converted into 2050 m of steam at atmospheric pressure and 100°C temperature. If 4.0 kg of water converted into steam at atmospheric pressure and 100°C temperature, then how much will be the increase in the internal energy. (The latent heat of vaporization of water is 2.3x10° J/kg. (a) 44x10° J (b) 88×10° J (c) 0 (d) 4.4x10° J
A piston-cylinder assembly contains 0.7 lb of air initially at a pressure of 30 lbf/in² and a temperature of 100°F. The air is heated at constant pressure until its volume is doubled. Assume the ideal gas model with constant specific heat ratio, k = 1.4. Determine the work and heat transfer, in Btu.
Question 2. One of the most efficient engines ever built is a coal-fired steam turbine engine in the Ohio River valley, driving an electric generator as it operates between 1970°C and 530 C. (a) What is its maximum theoretical efficiency? (b) Its actual efficiency is 42.0%. How much mechanical power does the engine deliver if it absorbs 1.40 x 10°J of energy each second from the hot reservoir.
Based on the thermodynamic properties provided for water, determine the amount of energy needed for 2.20 kg of water to go from -14.0 °C to 74.0 °C.
A 6-cylinder, two-stroke, diesel engine produces 1092 hp at 360 rpm. The engine has an expansion ratio of 5, a percent clearance of 3.0%, and a mechanical efficiency of 77.3% when it is operating at 31.3 0C and 101.7 kPa standard atmospheric conditions. It is then used as a generating unit by a plant at an elevation of 3289 ft where it gave a brake heat rate of 18,530 kJ/kW-hr at k=1.37 using a fuel having a heating value of 42,000 kJ/kg. Find BPo in HP Correct Answer: 987.25