A conference hall is to be i at 24 C dry bulb and 60 %RH. The estimated cooling loads are 75 tons and 25 tons sensible loads and latent loads, respectively. If cooled air from Air Handling Unit (AHU) is supplied to the hall at 15 C, determine the following below & plot the process on the Psychrometric chart.
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- No card B a m OO ON 94)| 1:50 mlms.hu.edu.jo/mod/qu 3 A 476 m rigid tank contains saturated Refrigerant-134a mixture at 700 kPa with 27% quality. A valve at the bottom of the tank is now opened, and only liquid is withdrawn from the tank. Heat is transferred to the refrigerant such that the pressure inside the tank remains constant. The valve is closed when no liquid is left in the tank and vapor starts to come out. What is the amount of R-134a that exited from the tank "kg"? R-134a Sat. vapor P = 700 kPa Sat. Liquid Select one: A. 42.72 B. 49.05 C. 45.49 D. 35.99 E. 39.55O Falge QUESTION 2 The refrigerant undergoes a change of phase during the heat-transfer process, the pressure of the retrigerant is the saturation pressure during the low supply and low rejection processes. True False QUESTION 3 Frequently, the vapor of the liquid leaving the condenser is lower than the saturation temperature. O True False QUESTION & The pressure of the iquid leaveng the condenser we be less than the pressure of the vapor entarng, wd etempernd the retigerant in the condenser. O Te QUESTION S Are many situations in which it is desirable to combine three cycles in series, either power systems or refigertion sytems, to take advantage of a very wide temperature range or to utilize what would otherwise be waste heat to improve etficiency O true O False QUESTION 6 A cycle can't be made very efficient, since the temperature differences between the two fluid streams can be controlled through careful design of the combined system. True1)with an aid of a drawing show how a Central cooling system that cool different machinery in the ship engine room. 2)
- Q3: Explain in detail the differences between vapor compression systems and evaporative cooling systems. This comparison should present advantages, disadvantages, potential applications, and suitability of each system to the climate conditions of Iraq.Why is information regarding the specific volume of gases important to the designer of air-conditioning, heating, and refrigeration equipment?A steam boiler has the following data: - Steam output: 8000 lb/hr - Steam pressure: 135 psia - % moisture: 1% - Feedwater temperature: 120 F - Boiler Surface Area: 1330 ft2 Determine: a. Factor of evaporation b. Equivalent evaporation c. Boiler horsepower d. Boiler rating
- 9. The preservation of foodstuffs by refrigerating is an expensive process, butthe canning process is more expensive than refrigeration. Ills?A 1-ton HVAC unit will remove up to 12,000 Btu/h. What size unit is neededfor a house with a heat load of 28,576 Btu/h? (Round up to the next highereither half or whole number.)b) The high pressure units on a steam plant operate at 10bar (gauge), and the condensate is sub-cooled by 9.5K. If the mass flow rate of condensate is 10 kg/s, use the provided steam tables to determine how much saturated steam at 1.5 bar this condensate could produce. Note it is sufficiently accurate for high pressure condensate, as in this question, to assume that the specific enthalpy is the same as for the saturated liquid at the same temperature.
- 3:57 A Done lecture 7_b5ee35c08478147bb8a3744a... Lec. (7) tar -Dry bulb temperature O Example (1): An air conditioning equipment (figure) have the following: - Supply air mass-1.26 kg/s. The cooling coil receives 20 % outdoor air and 80% return air. tdz Fig. 18.14. Representation of supply air condition and room design condition. 0.252 kg/s Refrigeration and A/C - Outdoor air conditions are: 28°C db, 19.5°C wb Return air conditions are: 22°C db, 50% RH. The mixture air condition outlet the cooling coil are: 10°C db, 0.00735 kg/kgda Draw the system on the Psychrometric chart, then calculate: 1. Cooling coil load. 2. Room sensible heat. 3. Room latent heat. 4. Fresh (outdoor) load. 5. Duct and fan heat gain 6. Sensible heat ratio SHR. If the supply air temperature increases with a value 1°K due to fan motor heat gain and 2°K due to duct heat gain. . ← 1.008 kg/s R to Dr. Omar M. Ali LTE الغرفة المراد تكييفها (22,50 %) 1.26 kg/s R Grand Sensible Heat Factor It is defined as the ratio of…1 atm steam (sat.) preheats CO2. If 2.26 MJ heat is released from 1kg of condensing steam, How much saturated steam is needed to condense to that 21 kg/s CO2is preheated from 303.15 K to 353.15 K? Cp CO2 = 4.5R, where R = 8.314 J/mol K. a. 0.40 kg/s b. 0.36 kg/s c. 0.30 kg/s d. 0.18 kg/s1- what's is the main benefit for the cooling tower packages . 2- compare the value of heat that rejected from water with the heat adding to the air and explain the Couse of difference . 3- make a search about cooling tower deals with the following items , a) the kind of cooling tower ., b) the problems that resisted the work of the cooling tower . c) define the approach and pointed the condition that deepened on .