An evaporative cooling system is to be used to condition a large warehouse located in Denver, Colo.,
Want to see the full answer?
Check out a sample textbook solutionChapter 3 Solutions
HEATING, VENTILATING,+AC ANAL...EBOOK>I<
Additional Engineering Textbook Solutions
Degarmo's Materials And Processes In Manufacturing
Automotive Technology: Principles, Diagnosis, and Service (5th Edition)
Engineering Mechanics: Dynamics (14th Edition)
Introduction To Finite Element Analysis And Design
Engineering Mechanics: Statics
Fundamentals of Heat and Mass Transfer
- The cooling load calculations on a theatre show that at design conditions the sensible heat load is 200 kw and the latent heat load is 70 kw. The indoor design conditions are 26°C dry bulb and50% relative humidity. Air is to be supplied to the theatre at 16°C while the outside airis at 30°C dry bulb and 60% relative humidity. Take ventilating air as 25% of the supply air. Calculate the tons of refrigeration required by the conditioner.arrow_forwardHw. No. 6 9. A large warehouse located at an altitude of 1500 m has to be maintained at a DBT of 270C and a relative humidity of 50% using a direct evaporative cooling system. The outdoor conditions are 330C (DBT) and 150C (WBT). The cooling load on the warehouse is 352 kW. A supply fan located in the downstream of the evaporative cooler adds 15 kW of heat. Find the required mass flow rate of air. Assume the process in evaporative cooler to follow a constant WBT.arrow_forwardQUESTION 1 Water at 60°C leaving a condenser at the rate of 22.5kg/s is sprayed into a natural-draught cooling tower and leaves it at 27°C. Air enters the tower at 1.013bar, 13°C and 50% relative humidity and leaves it at 38°C, saturated. Take Cp for the superheated vapour as 1.86 kJ/kgK. Calculate: 1.1. the air flow rate required in m/s; 1.2. the make-up water required in kg/s.arrow_forward
- The design condition for a space is 77oF db and 50% relative humidity with 55oF db supply air at 90% relative humidity. A 50-ton, constant-volume space air- conditioning system uses face and bypass and water temperature control. Outdoor air is supplied at 95oF db, 60% relative humidity with a ratio of 1 lbm to 5 lbm re-circulated air. A part-load condition exists where the total space load is decreased by 50% and the SHF is increased to 90%. The outdoor air condition changes to 85oF db and 70% relative humidity. Assume sea-level conditions. a) At full – load conditions:a. Show all the processes on a psychrometric chart.b. Determine the temperature must the air be supplied to the space at fullload conditions.c. Determine the apparatus dew point temperature at full load conditions. b)At part – load conditions:a. Show all the processes on a psychrometric chart.b. Determine the temperature must the air be supplied to the space at partload conditions.c. Determine the apparatus dew point…arrow_forwardUsing a psychometric diagram, describe the heating and humidification process from the following data. Initially the air was at dry bulb temperature (DBT) 35 ° C and RH 35%. air preheated to DBT 85 ° C. The heated air is then flowed through a humidifier to increase the RH to 25%. for this process, count, a. change in absolute humidity of air from initial to final conditions = ..... (kg water / kg air) b. change in air enthalpy from initial to final conditions = ..... (kj / kg air)arrow_forwardUsing a psychrometric diagram, describe the heating and humidification process from the following data. Initially the air was at dry bulb temperature (DBT) 30 ° C and RH 35%. The air is heated to DBT 80 ° C. The heated air is then flowed through a humidifier to increase the RH to 25%. For this process, calculate: a. Change in absolute humidity of air from initial to final conditions = ... (kg water / kg air) b. The change in enthalpy of air from initial to final conditions = ... (KJ / Kg of air)arrow_forward
- QI: An air conditioning system is used to keep indoor condition of 24°C and 50% relative humidity inside a space as shown in Figure 1. An amount of 75% of returned air is mixed with 25% fresh ambient air at 40°C and 40% relative humidity before entering to the air filter. The air is cooled though the air cooling coil of surface effective temperature (apparatus dew point temperature) equals to 10°C and bypass factor is 0.2. Find the following: a. State of air after mixing (point m). b. State of air at coil outlet (point c). c. Sketch the process on the psychometric chart. d. Sensible heat factor of the space. space exhaust (25%) cooling coil filter fan m fresh air (25%) Figure 1arrow_forwardUse the concept of evaporative cooling to explain how air’s relative humidity is measured using a sling psychrometerarrow_forwarddiscuss the effect of the property below in relation to SENSIBLE COOLING process. What if the cooling process is below its dew point temperature?arrow_forward
- A dryer is to deliver 1,000 kg/h of palay with final moisture content of 10%. The initial moisture content in the feed is 15% at atmospheric condition with 30 oC dry bulb and 20 oC wet bulb. The dryer is maintained at 45oC while the relative humidity of the hot humid air from the dryer is 80%. If the steam pressure supplied to the heater is 2 MPa, determine the following: a.) Palay supplied to the dryer in kg/h. b.) Temperature of the hot humid air from the dryer in oC. c.) Air supplied to dryer in cu m/h. d.) Heat supplied by the heater in k W. e.) Steam supplied to heater in kg/h.arrow_forwardQ16: Air at 10° C dry bulb temperature and 8° C wet bulb temperature is supplied at the rate of 15m/min. It is brought to 20° C dry bulb temperature and 60% relative humidity by heating and then by adiabatic humidification. Find (a) capacity of the heating coil in kW, (b) surface temperature of the coil, if the by-pass factor is 0.32, and (c) capacity of the humidifier. [Ans. 3.6 kW; 26.77° C ;0.0555 kg / min]arrow_forwardAir enters a coil in the air-handling unit (AHU) at dry-bulb temperature (Id) of 40 oC, and wet- bulb temperature (Tw) of 26 oC. The air leaves the coil at dry-bulb temperature (Td) of 12 oC, and relative humidity of 80%. This process is: Note: You need to use the psychrometric chart. O Cooling and humidification, and the air looses 50 kJ/kg of energy. O Heating and humidification and the air gains 110 kl/kg of energy. O Evaporative cooling and the air neither looses nor gains energy. O Cooling and dehumidification and the air looses 50 kl/kg of energy.arrow_forward
- Elements Of ElectromagneticsMechanical EngineeringISBN:9780190698614Author:Sadiku, Matthew N. O.Publisher:Oxford University PressMechanics of Materials (10th Edition)Mechanical EngineeringISBN:9780134319650Author:Russell C. HibbelerPublisher:PEARSONThermodynamics: An Engineering ApproachMechanical EngineeringISBN:9781259822674Author:Yunus A. Cengel Dr., Michael A. BolesPublisher:McGraw-Hill Education
- Control Systems EngineeringMechanical EngineeringISBN:9781118170519Author:Norman S. NisePublisher:WILEYMechanics of Materials (MindTap Course List)Mechanical EngineeringISBN:9781337093347Author:Barry J. Goodno, James M. GerePublisher:Cengage LearningEngineering Mechanics: StaticsMechanical EngineeringISBN:9781118807330Author:James L. Meriam, L. G. Kraige, J. N. BoltonPublisher:WILEY