Refrigeration and Air Conditioning Technology (MindTap Course List)
8th Edition
ISBN: 9781305578296
Author: John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson
Publisher: Cengage Learning
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Chapter 37, Problem 21RQ
If a rectangular duct system s
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Chapter 37 Solutions
Refrigeration and Air Conditioning Technology (MindTap Course List)
Ch. 37 - Name five changes that are made to air to...Ch. 37 - The two ways that fresh air enters a structure are...Ch. 37 - Which of the following types of fan is used to...Ch. 37 - True or False: Turbulence in airflow causes...Ch. 37 - Name two types of blower drives.Ch. 37 - Pressure in ductwork is expressed in which of the...Ch. 37 - What is a common instrument used to measure...Ch. 37 - Prob. 8RQCh. 37 - Name the two types of return-air systems in...Ch. 37 - What is the component that distributes air in the...
Ch. 37 - Warm air heats a room better if distributed A. low...Ch. 37 - Name four materials used to manufacture duct.Ch. 37 - The name of the fitting where the branch line...Ch. 37 - Prob. 14RQCh. 37 - Prob. 15RQCh. 37 - Prob. 16RQCh. 37 - Multiple-zone systems often use a(n) __________or...Ch. 37 - Prob. 18RQCh. 37 - Prob. 19RQCh. 37 - Prob. 20RQCh. 37 - If a rectangular duct system s (12in.26in.) has an...Ch. 37 - The equivalent feet of pressure drop for a group...
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- I need the answer as soon as possiblearrow_forward. What horsepower is supplied to air moving at 7m/min through a 70cmx90cm duct under a pressure of8cm of H2O?arrow_forwardFind the loss in total pressure for each run in the simple duct system of Fig. 1, using the equal-friction method and in English unit. The total pressure available for the duct system is 0.12 in. wg (30 Pa), and the loss in total pressure for each diffuser at the specified flow rate is 0.02 in. wg (5 Pa). Duct fittings are listed in Table 1. Assume the duct dimeter in run 1 is 10 in. and the rest are 8 in. Does the duct system require any adjustment? 150 cfm e. a 15 ft Plenum е 15 ft 5 ft 5 ft a 3. 20 ft 4 10 ft 200 cfm e 10 ft 150 cfm b Duct Fittings for Figure 1 Fittings Type Abrupt Entrance 90 deg Elbow, Pleated Round to Rectangular boot, Straight 45 deg. Converging Wye 45 deg Elbow, Pleated a d earrow_forward
- A "spa tub" is to be designed to replace bath tubs in reno- vations. There are to be 6 outlet nozzles, each with a di- ameter of 12 mm, and each should have an outlet velocity of 12 m/s. What is the required flow rate from the single pump that supplies all of these nozzles? If there is one suction line leading to the pump, what is the minimum diameter to limit the velocity at the inlet of the pump to 2.5 m/s?arrow_forwardUsing velocity reduction method, design the duct system. Take the velocity of air in main duct as 8m/sec, air density 1.2kg/m. Coranch = 0.4 Coutlet = 1 2. Using equal pressure drop method, design the duct system. Take Ap = 1pa/m, air density 1.2kg \m. Cranch = 0.4 Coutlet = 1arrow_forwardFind the air flow rate in the duct. Data: Air pressure: 17 psia air temperature at the inlet: 65 F air temperature at the exit: 125 F duct wall temperature 230 F duct cross section is 1.5 ft by 1 ft length of the heated segment is: 8 ftarrow_forward
- Q:/ Discuss the relation between the head pressure and flow rate for the benefits of connecting the pumps in parallel ?arrow_forwardNeed solution asap..arrow_forwardRefrigeration and Air Conditioning Engineering Dept. 3rd year - refrigeration and Air Conditioning Course UNIVERSITY OF WARITH AL-ANBIA Asst. Ihab Omar 1.Using velocity reduction method, design the duct system. Take the velocity of air in main duct as 8m/sec, air density 1.2kg/m. Cbranch = 0.4 Coutlet = 1 2.Using equal pressure drop method, design the duct system. Take Дp 1pa/m, air density 1.2kg\m³. Cbranch = 0.4 Coutlet = 1 1.5 m/s 1.5 mls 1.5 m /s 1.5 m'/s A 7.5 m/s 6 m/s C 4.5 m'/s 3 m /s B. E -10 m 10m. 10 m- 10 m- A.C. system F 17arrow_forward
- A two branch duct system of circular duct is shown below. The fittings have the following equivalent lengthof straight duct upstream to branch 4m elbow 2m. There is negligible pressure loss in the straight throughsection of the branch. The designer slects 3m/s as the air velocity in all branch sections.What diameter in ft should be selected in the 5 m branch section? A. 2.136 B. 0.340 C. 0.651 D. 1.050arrow_forwardThe impeller of a centrifugal pump having external and internal diameter 500mm and 250mm respectively, width at out let 50mm and running at 200rpm works against a head of 48m. The velocity of flow through the impeller is constant and equal to 3m/s the vanes are set back at an angle of 400 at outlet. Determine A.inlet vane angle B.workdone by the impeller on water per second c.manometric efficiencyarrow_forwardA Forced - Draft (FDF) with open suction has rated capacity of 4,000 CFM at 1,800 rpm. The pressure developed at the discharged duct is 10 mm H2O. The discharge duct is circular with inside diameter of 600 mm. Calculate the following:a) what is the velocity of air at the discharge in mm H2O?b) what is the theoretical fan power required in kW?Consider standard density of water and air are 1000 kg/m3 and 1.20 kg/marrow_forward
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