A Refrigeration Example
A freezer is to be maintained at -10C; and the refrigeration requirement is 1200 kW.
Cooling water is available at 15C. The minimum approach is 5C. For R-134a, what is
the coefficient of performance, and what is the mass flow of re
CHE 249 Fall 2014
Present Worth/Annual Worth, Pay Back Period
1. There are two choices for a tunnel borer:
Tiger: FC = $180,000, fuel costs = $30/hour
Crusher: FC = $250,000, fuel costs = $28/hour
Both operate 12 hours per weekday for 50 weeks/
Q1) Calculate the number of liters per year of liquid that can be transported through the
following pipe sizes assuming a constant liquid velocity of 1 meter/sec.
a) 3 cm ID
b) 5 cm ID
c) 25 cm ID
d) 50 cm ID
Comment on the magnitude of the result and the
Introduction to chromatography
Commonly used techniques:
Physical separation and purification of a
compound or compounds within a
Greek - color writin
CHE204 Lecture #4
What is Spectroscopy?
Interaction between EMR and matter
Different radiation type = different energy = different
Figure. Electromagnetic spectrum.
(Colour Therapy Healing Corporation)
CHE 211-Problem Set 6
A tank partition is used to store water (=1000kg/m3) and nitric
acid. The partition is made of a 2 m-wide plate with 0.5m-wide
and 2 m-high door held in place by hinge at the top and
retaining force at the bottom as shown. The spe
Nagel: War and
What is the moral basis of war restrictions [jus in
Can we create a rational basis for war restrictions?
US soldiers killed about 500 unarmed civilians in
March of 1968.
Women, children and the
Use of analytical tools to deduce structural
Mass spectrometry (MS)
Infrared (IR) spectroscopy
Nuclear magnetic resonance (NMR) spectroscopy