Calculate the loss in efficiency

Assignment Help Electrical Engineering

Reference no: EM131227093

In Fig. 16-2 for a siaglsspeed heat pump, assume that each on and off peria is 10 min long, that is, there are three cycles per hour. When the compressor is turned on, its output increases exponentially, reaching 99% of its maximum capacity at the end of the 10-min on interval. Once the compressor is turned off, the heating (or cooling) decays with a much smaller time constant and can be assumed to be instantaneous.

(a) If the rated electrical power is drawn throughout the on interval, calculate the loss in efficiency due to the exponential rise in the compressor output.

(b) A load-proportional capacity-modulated heat pump is used to eliminate the above on-off cycling. The efficiency of the solid-state controller is 96% and the motor efficiency is lower by I percentage point because of reduced speed, reduced load operation, and inverter harmonics. Assume that the compressor efficiency remains unchanged. Compare the system efficiency with the single-speed compressor system of part a if the motor efficiency in part a can be assumed to be 85%

Reference no: EM131227093

Questions Cloud

Find the mean of probability distribution : A. Create the probability distribution table for grade points for this professor. B. Find the mean of this probability distribution and provide and interpretation of this mean. C. Find the variance and standard deviation.

Compute the probability that a person : A certain disease has an incidence rate of 0.3%. If the false negative rate is 6% and the false positive rate is 4%, compute the probability that a person who tests positive actually has the disease.

What basic trading principle is involved in given situation : What basic trading principle is involved in this situation? - If Marlene's expectations are correct, what will the price of this bond be in two years?

What about support for people with disabilities : The average American's health care literacy; in other words, can they comprehend what they are reading on these sites to make an informed choice? What about support for people with disabilities?

Calculate the loss in efficiency : If the rated electrical power is drawn throughout the on interval, calculate the loss in efficiency due to the exponential rise in the compressor output.

What is the probability this student will receive : What is the probability this student will receive 2 or more offers? (Round to 3 decimal places.)

Analyze how employee motivation affects organizational : Research, analyze and interpret how employee motivation affects organizational behavior as well as three strategies an organization can do to increase employee motivation.

Person score be on a scale : A person gets a score of 52 on a test with a mean of 56 and standard deviation of 4. What would the person's score be on a scale with a mean of 100 and standard deviation of 15?

Write a page response to this ethical challenge : Communication, Culture and Work: Write a page response to this Ethical challenge. While you are a customer, he makes a blatantly offensive joke. How do you respond?

User Account

All Pages