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3.1. A dense air refrigeration system is working with pressure limits of 1 bar and 5.5 bar. The temperature of air at the beginning of compression is 4 °C and after cooling at constant pressure the temperature of air becomes 47 °C. The compression is polytropic with n=1.28 and a mechanical efficiency of 75% while the expansion is polytropic with n=1.25 and an efficiency of 85%. For 8 TR capacity, determine the system's actual COP and power required (in kW). (20) 3.2 What type of refrigeration system is dense air refrigeration system? (2) 3.3 Explain why the reverse Carnot refrigeration system is not a practical system. (4) (Ans: 4.72, 5.9 kW)

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The bacterial cell wall offers protection against what type of environment? isotonic hypotonic hyperosmotic hypertonic

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Why do corporations tend to "sell" viewers on a particular ideal of beauty, according to the film The Illusionists? Because that is the ideal that each individual nation has chosen for its own people. Because that is the ideal that will create insecurities and thus sell products. Because that is the ideal that makes you most sexy and desirable to others, based on biological programming. Because that is the ideal that makes you feel good about yourself.

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L_(n)=(2\pi )/(n)\sum_(i=1)^n 2\pi (i-1)/(n)cos(2\pi (i-1)/(n)) Solve for the left reimann sum 68. $L_n = \frac{2\pi}{n}\sum_{i=1}^{n} 2\pi \frac{i-1}{n} \cos\left(2\pi \frac{i-1}{n}\right)$

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Which of the following statements is a practical rationale for using a B-A-B reversal design? (Select all that apply.) Question 54 options: Treatment is already in place. Treatment effects are unlikely to reverse. Experimenter is interested in quickly understanding the effects of two different treatments. Behavior of interest is dangerous and delaying an effective treatment would be unethical.

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Suppose an auto manufacturer produces 20,000 vehicles this year and only sells 15,000 of them to auto dealers. Under which expenditure approach category do the remaining 5,000 vehicles fall?

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2) Choose all that are correct: If a growing person had severe anxiety for several months during a rapid growth phase: a) Downward deviations in blood calcium would likely occur b) PTH secretion would be increased c) Osteoblasts would be more likely to continue secreting RANKL and stimulating osteoclasts to reabsorb bone, resulting in weakening of the bones d) Osteoclasts would be triggered by increased PTH to cease bone reabsorption so that osteoblasts can deposit more new bone tissue

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Which transaction would NOT be included in the GDP calculation of a country? the value of an increase in unsold inventory of a company price of a new public school building unemployment insurance paid by the government to a person that recently lost her job salary of a federal employee

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I WILL GIVE DISLIKES !!! IF ANYTHING WRONG HAPPENS IN MY QUESTION, BETTER SKIP IT!!! SP13

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Given the greater genetic variance in the Tibetan population, this statement suggests that the potential for natural selection to act on the Tibetan populations is ____ than in the Andean population. Select the answer that correctly fills in the blank. Greater Lower Identical

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