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In: Mechanical Engineering

Humid air at 300 kPa, 10°C, and 90% relative humidity is heated in a pipe at...

Humid air at 300 kPa, 10°C, and 90% relative humidity is heated in a pipe at constant pressure to 50°C. Calculate the amount of heat, in kJ/kg dry air, required

Expert Solution

samet mamat answered 2 years ago

Humid air at 155 kPa, 40°C, and 70 percent relative humidity is cooled at constant pressure...

Humid air at 155 kPa, 40°C, and 70 percent relative humidity is cooled at constant pressure in a pipe to its dew-point temperature. Calculate the heat transfer, in kJ/kg dry air, required for this process. Use data from the tables. The heat transfer is kJ/kg dry air.

In a device to produce drinking water, humid air at 32C, 90% relative humidity and 1...

In a device to produce drinking water, humid air at 32C, 90% relative humidity and 1 atm is cooled to 5C at constant pressure. If the duty on the unit is 2,200 kW of heat is removed from the humid air. Data: Air at 32C has H = 0.204 kJ/mol and at 50C has H = -0.576 kJ/mol H of steam can be found on the steam tables – vapor at 32C and 1 atm; vapor at 5C and liquid...

1222 Air enters a heating section at 100 kPa, 9oC, 45% relative humidity at rate of...

1222 Air enters a heating section at 100 kPa, 9oC, 45% relative humidity at rate of 10m3/min, and it leaves at 22oC. Determine (a) the rate of heat transfer (Q?) in the heating section and (b) the relative humidity (??) at the exit. (c) What-if Scenario: What would the relative humidity at the exit be if the relative humidity of the mixture changed to 75%?

In a low temperature drying system, air at 60°C and 10% Relative humidity passes over a...

In a low temperature drying system, air at 60°C and 10% Relative humidity passes over a bed of diced carrots at 20 kg-dry air/sec. The rate of water removal from the carrots Is measured by difference in total weight over time and found to be approximately .16 kg-water/sec. In the system described above, calculate the temperature and relative humidity of the air exiting the drying system.

Moist air at 55 oF dry bulb temperature and 40% relative humidity is first heated through...

Moist air at 55 oF dry bulb temperature and 40% relative humidity is first heated through a heating coil. The air is then adiabatically humidified by saturated water vapor at 4.5 psia. The exit air has a dry bulb temperature of 90 oF and wet bulb temperature 65 oF. Air is supplied at a volume flow rate of 478.5 cfm. Assume sea level pressure throughout. Determine the following. a) Show the inlet and outlet air condition clearly on the psychrometric...

If at 30F the air has 25% relative humidity, what is the relative humidity at 70F...

If at 30F the air has 25% relative humidity, what is the relative humidity at 70F and how much moisture must be added to get it up to 50% relative humidity.

Air at 38.0°C and 99.0% relative humidity is to be cooled to 16.0°C and fed into...

Air at 38.0°C and 99.0% relative humidity is to be cooled to 16.0°C and fed into a plant area at a rate of 510.0 m3/min. You may assume that the air pressure is 1 atm in all stages of the process. Calculate the rate the water condenses in kg/min.

Air at 35°C and 33% relative humidity is used for drying a food product. The air...

Air at 35°C and 33% relative humidity is used for drying a food product. The air is first heated to 90°C and then cooled adiabatically to an exit dry bulb temperature of 40°C. (a) How much moisture did the air pick up? (b) Calculate the change in enthalpy from the initial unheated air to the final moist air. (c) If the food is dried from 85% moisture to 20% moisture (both on a wet basis) at an inlet flow rate...

300% excess air having a dry bulb temperature of 25 degree celsius and relative humidity of...

300% excess air having a dry bulb temperature of 25 degree celsius and relative humidity of 60% is used to fully combust 1 kg/hr of methane in a boiler and the heat of reaction is used to generate steam. Hot water enters the boiler as a saturated liquid at 102 degree celsius and leaves as superheated at 40 bar and 400 degree celsius. The combusted gases leave the boiler at 450 degree celsius and are then cooled to 25 degree...

There are 10 m3/s of moist air at 22C and relative humidity of 50% that enter...

There are 10 m3/s of moist air at 22C and relative humidity of 50% that enter a heating element until its temperature becomes 35C. Determine the amount of heat required and the final %Rh of the air.