The air supply to a 2000-ft3 office has been shut off

Chapter 4, Problem 4.129

(choose chapter or problem)

The air supply to a \(2000-\mathrm{ft}^{3}\) office has been shut off overnight to conserve utilities, and the room temperature has dropped to \(40^{\circ} \mathrm{F}\). In the morning, a worker resets the thermostat to \(70^{\circ} \mathrm{F}\), and \(200 \mathrm{ft}^{3} / \mathrm{min}\) of air at \(120^{\circ} \mathrm{F}\) begins to flow in through a supply duct. The air is well mixed within the room, and an equal mass flow of air at room temperature is withdrawn through a return duct. The air pressure is nearly 1 atm everywhere. Ignoring heat transfer with the surroundings and kinetic and potential energy effects, estimate how long it takes for the room temperature to reach \(70^{\circ} \mathrm{F}\). Plot the room temperature as a function of time.

Unfortunately, we don't have that question answered yet. But you can get it answered in just 5 hours by Logging in or Becoming a subscriber.

Becoming a subscriber
Or look for another answer

×

Login

Login or Sign up for access to all of our study tools and educational content!

Forgot password?
Register Now

×

Register

Sign up for access to all content on our site!

Or login if you already have an account

×

Reset password

If you have an active account we’ll send you an e-mail for password recovery

Or login if you have your password back