Tutorial 1
(Conduction and Convection)
1. Consider a composite structure shown on below. Conductivities of the layer are: k1 = k3 = 10 W/mK, k2 = 16 W/mK, and k4 = 46 W/mK. The convection coefficient on the right side of the composite is 30 W/m2K. Calculate the total resistance and the heat flow through the composite. (0.46, 173.9 W)

2. Consider a 1.2-m high and 2-m-wide glass window whose thickness is 6 mm and thermal conductivity is k= 0.78W/m. 0C. Determine the steady rate of heat transfer through this glass window and the temperature of its inner surface for a day during which the room is maintained at 24 0C while the temperature of the outdoors is -5 0C. Take the convection heat transfer coefficients on the inner and outer surfaces of the window to be h1= 10 W/m2 .0C and h2 = 25 W/m2 .0C and disregard any heat transfer by radiation. (471W, 4.40C)

3. Consider a 1.2-m-high and 2-m-wide double-pane window consisting of two 3-mm-thick layers of glass (k=0.78 W/m .0C) separated by 12-mm-wide stagnant air space. Determine the steady rate of heat transfer through this double-pane window and the temperature of its inner surface for a day during which the room is maintained at 24 0C while the temperature of the outdoors is -50C. Take the convection heat transfer coefficients on the inner and outer surfaces of the window to be h1=10 W/ m2 .0C and h2 = 25 W/m2 .0C and disregard any heat transfer by radiation. Given also k air = 0.026 W/ m .0C (114W, 19.20C)

4. A cylindrical resistor element on a circuit board dissipates 0.15W of power in an environment at 400C. The resistor is 1.2 cm long, and has a diameter of 0.3cm. Assuming heat to be transferred uniformly from all surfaces, determine (a) the amount of heat this resistor dissipates during a 24-h period, (b) the heat flux on the surface of the resistor, in W/m2 and (c) the...

...Heat Conduction along a Composite Bar
Objective
To study the conduction of heat along a composite bar and evaluate the overall heat transfer coefficient.
Theory
Thermal conduction is the mode of heat transfer which occurs in a material by virtue of a temperature gradient within it. A solid is chosen for the demonstration of pure conduction since both liquids and gasses exhibit excessive convective heat transfer. In a practical...

...study the conduction of heat along a composite bar and evaluate the overall heat transfer coefficient.
INTRODUCTION
Conduction is defined as the transfer of energy from more energetic particles to adjacent less energetic particles as a result of interactions between the particles. In solids, conduction is the combined result of molecular vibrations and free electron mobility. Metals typically have high free electron mobility, which explains why...

...NAME ____________________________________ LAB TIME/DATE _______________________
R E V I E W
S H E E T
EXERCISE
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Conduction System of the Heart and Electrocardiography
The Intrinsic Conduction System
1. List the elements of the intrinsic conduction system in order, starting from the SA node. SA node → ATRIOVENTRICULAR (AV) NODE → → ATRIOVENTRICULAR (AV) BUNDLE
BUNDLE BRANCHES
PURKINJE FIBERS ATRIOVENTRICULAR (AV) NODE...

...The Cardiovascular System: Intrinsic Conduction System
1. The intrinsic conduction system consists of __autorhythmic cardiac______ cells that initiate and distribute __impulses___ throughout the heart.
2. The intrinsic conduction system coordinates heart activity by determining the direction and speed of _heart depolarization___. This leads to a coordinated heart contraction.
3. List the functions for the following parts of the intrinsic...

...The intrinsic Conduction System
1. List the elements of the intrinsic conduction system in order starting from the SA Node.
SA node, AV Node, Av Bundle, left and right bundle branches, Purkinge fibers
At what structure in the transmission sequence is the impulse delayed?
Av Node
Why?
Allows completion of atrial contraction before initiation of ventricular systole.
2. Even though cardiac muscle has an inherent ability to beat. the nodal system plays a...

...nductioIn heat transfer, conduction (or heat conduction) is the transfer of heat energy by microscopic diffusion and collisions of particles or quasi-particles within a body due to a temperature gradient. The microscopically diffusing and colliding objects include molecules, electrons, atoms, and phonons. They transfer microscopically disorganized kinetic and potential energy, which are jointly known as internal energy. Conduction takes place in all...

...heat transfer are:
Conduction or diffusion
The transfer of energy between objects that are in physical contact
Convection
The transfer of energy between an object and its environment, due to fluid motion
Radiation
The transfer of energy to or from a body by means of the emission or absorption of electromagnetic radiation
Mass transfer
The transfer of energy from one location to another as a side effect of physically moving an object containing that energy...

...Experiment 16: Heat conduction
Introduction
In this laboratory you will study heat flow across a temperature gradient. By comparing the temperature difference across one material to the temperature difference across a second material of known thermal conductivity, when both are conducting heat at a steady rate, you will be able to calculate the thermal conductivity of the first material. You will then compare the experimental value of the calculated thermal conductivity to the...