A system efficiency 69%, must hit 10 kg of water from 20°C to 100°C within 30 minutes. If the specific heat capacity of water is 4187 J/kgK, what will it cost the company, if the price of electricity is R1.70 per kWh?
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- A steam engine is operating at its theoretical maximum efficiency of 48%. If the waste heat has a temperature of 31°C), what is the temperature of the boiler in °C?Consider a room that is initially at the outdoor temperature of 20oC. The room contains a 40-W lightbulb, a 86-W TV set, a 319-W refrigerator, and a 1,339-W iron. Assuming no heat transfer through the walls, determine the rate of increase of the energy content of the room when all ofthese electric devices are on.For a total PV module of 25m2, what would be the PV power for each if conversion efficiency is 15% on days when an angle of a south-facing collector in [city] be tipped up to have it normal to the Sun's rays at solar noon?
- A 0.44 m3 well-insulated tank contains nitrogen at 100 kPa and 30 deg C. Heat is added until the pressure is 150 kPa. What is the heat transfer (kJ)? Report your answer to 2 decimal places.To heat a room with dimensions width a=3 m, length b=5 m, height h=2,2 m, approximately an electrical power of P=10 W per square meter is needed. At a cost of 0.2 soles per kW.h, how much will it cost per day to use this heater?The temperature at state A is 20ºC, that is 293 K. What is the heat (Q) for process D to B, in MJ (MegaJoules)? (Hint: What is the change in thermal energy and work done by the gas for this process?)
- An automobile has a mass of 1,547 kg, and its aluminum brakes have an overall mass of 10.2 kg. (a) Assuming all the internal energy transformed by friction when the car stops is deposited in the brakes and neglecting energy transfer, how many times could the car be braked to rest starting from 29.0 m/s before the brakes would begin to melt? (Assume an initial temperature of 20.0°C. Count only the number of times the car can come to a complete stop without the brakes melting in the process. The melting point of aluminum is 660°C.)(a) What is the best coefficient of performance for a refrigerator that cools an environment at -28 C and has heat transfer to another environment at 49 ° C? COP, = 3.18 ref (b) How much work must be done for a heat transfer of 4186 kJ from the cold environment? W = 1316.4 kJ (c) What is the cost of doing this if the work costs 10.0 cents per 3.6x10° J (a kilowatt-hour)? Cost in cents = 3.66 (d) How many kJ of heat transfer, Q, occurs into the warm environment? Qn = 1314.5A 200-g aluminum calorimeter can contains 500 g of water at 20°C. A 100-g piece of ice cooled to -20°C is placed in the calorimeter. (a) Find the final temperature of the system, assuming no heat losses. (Assume that the specific heat of ice is 2.0kJ/kg-K.) (b) A second 200-g piece of ice at -20°C is added. How much ice remains in the system after it reaches equilibrium? (c) Would your answer to part (b) be different if both pieces of ice were added at the same time?
- The input power to operate a boiler comes from an electrical circuit with a voltage of 110 volts [ V ] and a resistance of 3 ohms [ Ω ]. The boiler produces 70 kilojoules of heat per minute [ k J m i n ] . What is the efficiency of the boiler, expressed as a percentage [ % ] ?units in the heat absorption from the outside air. (b) 36,000 Btu/h Answers: (a) 9.43 hp, cdmppun