Answer:
d. 90%
Explanation:
As we know that internal combustion engine produce lot's of toxic gases to reduce these toxic gases in the environment a device is used and this device is know as current modeling converter.
Generally the efficiency of current model catalytic converter is more than 90%.But the minimum efficiency this converter is 90%.
So option d is correct.
d. 90%
Answer:
Explanation:
Given
Required
Convert to standard form
From laws of indices
So, is equivalent to
Hence, the standard form of is
Answer:
a) , b)
Explanation:
a) The counterflow heat exchanger is presented in the attachment. Given that cold water is an uncompressible fluid, specific heat does not vary significantly with changes on temperature. Let assume that cold water has the following specific heat:
The effectiveness of the counterflow heat exchanger as a function of the capacity ratio and NTU is:
The capacity ratio is:
Heat exchangers with NTU greater than 3 have enormous heat transfer surfaces and are not justified economically. Let consider that . The efectiveness of the heat exchanger is:
The real heat transfer rate is:
The exit temperature of the hot fluid is:
The log mean temperature difference is determined herein:
The heat transfer surface area is:
Length of a single pass counter flow heat exchanger is:
b) Given that tube wall is very thin, inner and outer heat transfer areas are similar and, consequently, the cold side heat transfer coefficient is approximately equal to the hot side heat transfer coefficient.
Answer:
mass of the air = 14.62kg
Workdone = 415.88 kJ
Heat transfer = 415.88 kJ
Explanation:
Please find the attached files for the solution