TERMO - requested The COP is simply put the warm air...

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Problem 1 A In order to fill the gasometer in Figure 1 a compressor must be selected for a certain pressure. A F P = 2 2 2 2 / 82 , 9 3000 = π s m kg = Pa 352312 , 2344 Of course the ambient pressure is not to be forgotten: = P Pa Pa Pa 35 , 102344 100000 352312 , 2344 = + B The amount of hydrogen under Standard Conditions contained in the gasometer is now desired. In order to calculate this the Ideal Gas Law is required. T R pv m T mR pv i i = = ) 15 , 273 20 ( / 9 , 4124 / 100000 7 , 37 2 3 K kgK J m N m + = = kg 117726592 , 3 C In Figure 2 counterweights are installed in the gasometer. The desired result is for the pressure inside the gasometer to be limited to 150mm water column above ambient pressure. h r V 2 π = 3 2 885 , 1 150 , 0 2 m m m = = π kg m m 1885 1000 885 , 1 3 = = The mass of the cover is 3000kg, so the total counterweight must be kg kg kg 1115 1885 3000 = - D The storage volume under the preceding conditions at constant mass of hydrogen is found by once again using the Ideal Gas Law. p T mR v T mR pv i i = = p K kg ) 15 , 273 20 ( 9 , 4124 12 , 3 + = ?????????????
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Problem 2 A The theoretical coefficient of performance of the heat pump shown in Figure 3 is
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Unformatted text preview: requested. The COP is simply put the warm air temperature divided by the highest temperature difference. COP= L H H T T T-The evaporating temperature shall be 0˚C and the condensing temperature shall be 10K higher than the warm air supply, therefore COP= 804 , 8 35 15 , 308 273,15K) C ( 10K 273,15K C 25 10K 273,15K C 25 = = + °-+ + ° + + ° K B The amount of cooling and heating by the heat pump is found by using the “Effect Factor,” ε . The total work is already known as 750W. L H L k L cool T T T W Q-= = = L H L k L T T T W Q-⋅ = ⇔ W K K K W 21 , 5853 15 , 273 15 , 308 15 , 273 750 =-⋅ = And L H H k H heat T T T W Q-= = L H H k H T T T W Q-⋅ = ⇔ W K K K W 21 , 6603 15 , 273 15 , 308 15 , 308 750 =-⋅ = C Energy is lost through building the envelope????????????? D The temperature of the cold exhaust air is BLAH E The air flow...
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