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Determine the mass flow rate of spray water and the power required for heating, if the pressure throughout is 1 bar.
Cooling water enters a cooling tower at a rate of 1000 kg/h and 70 degree C. Calculate the flow rate of the dry air in kg/h and the make-up water required per hour. Ans. 2088 kg/h, 62.9 kg/h.
Estimate the moisture picked up by 1 kg of dry air, and the total enthalpy change between the entering and leaving streams expressed per unit mass of dry air.
What percentage of the water flow rate must be supplied as make-up water to replace the water evaporated into the air stream?
Estimate (a) the capacity of the cooling coil and its bypass factor, (b) capacity of the heating coil and its surface to temperature when the bypass factor is 0.25 and (c) the mass of water vapour r
Calculate the specific humidity, dew point, wet bulb temperature, mass of dry air and mass of water vapor. If the mixture is cooled at constant pressure to 5degree Celsius, Calculate the amount of wat
During the process there is a heat transfer of 60 kJ from the ideal gas to the surroundings. Determine the volume and pressure at the end of the process.
Determine the amount of heat transferred to the air, in kJ, while increasing the temperature to 1200 K. Assume air has the constant specific heats evaluated at 300 K.
What is the mass flow rate in kg/s through the turbine? The turbine and electric generator as a combined system operate with an efficiency of 85%.
Assuming there is a minimal cooling of the condensate after condesing, how many kilograms of steam per hour must be used to heat the air. What is the heating power required in kW.
A piece of machinery can be bought for $10,000 cash or for $2000 down and annual payments of 750 for 15 years. What is the interest rate for the time payments?
Calculate the energy requirement to heat 100 lb water from 100 F to 90 C in Btu. If an electrical heating element is needed for this heating process.
If the water has an initial temperature of 25 degrees celcius, how long in minutes would it take for the pot to boil? Data: Average heat capacity of water = 4.2 kJ/(kg.
The exhaust from a natural gas heating is expelling combustion products at a rate of 10 mole per minute. What is the composition of the flue gas in mole percentage
The plant generates 20MW of electricity, and uses coal with a heating value of 28 MJ/kg as the fuel. Determine how much coal in tonnes per day must be burned to sustain the generation of 20MW of ele
Determine the mass flow rate of fuels in grams per second from the gasoline tank to the cars fuel injection systems and the time in hours to empty the tank.
Determine the exergy transfer accompanying heat and the exergy destruction, each in Btu, for an enlarged system that includes the air and the wall, assuming that the state of the wall remains unchan
A rigid tank contains 0.1-kg of air at 300 kPa and 300 kelvin. The air is now heated until the pressure doubles. determine the a) the final pressure in the tank (kPa); b) the volume of the tank (m^3
During a cold day, it is observed that the appliances all run continuously but the air temperature remains constant. What is the rate of heat loss from the room?
Determine (a) the effectiveness of the regenerator, (b) the rate of heat removal from the refrigerated space, and (c) the COP of the cycle.
Draw a schematic diagram of the cycle and start with the naming point 1 the inlet of steam to the turbine and then pt. 2 is the exit from the turbine etc.
Which is then restored to its initial T and P. As a result of the process, does the total number of moles of liquid increase, decrease, or remain unchanged? and Why?
Determine (a) the degrees of subcooling of the refrigerant in the condenser, (b) the mass flow rate of the refrigerant, (c) the heating load and the COP of the heat pump.
Assuming the turbines and the pumps to be isentropic, and determine the mass flow rate of steam through the boiler for a net power output of 15 MW.
Determine: the net work per cycle in kJ, the power developed by the engine in kW if the cycle is executed 1000 times per minute and the ccyle thermal efficiency. Assume the cold-air standard approxi