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Sunday, April 26, 2020 | History

4 edition of Film condensation in a horizontal rectangular duct found in the catalog.

Film condensation in a horizontal rectangular duct

Jing LuМ€

Film condensation in a horizontal rectangular duct

final report on the experimental part of the project on film condensation under microgravity conditions

by Jing LuМ€

  • 391 Want to read
  • 31 Currently reading

Published by Michigan Technological University, College of Engineering, Mechanical Engineering - Engineering Mechanics Dept., National Aeronautics and Space Administration, National Technical Information Service, distributor in Houghton, MI, [Washington, DC, Springfield, Va .
Written in English

  • Heat -- Transmission

  • Edition Notes

    StatementQing Lu, N.V. Suryanarayana; principal investigator.
    Series[NASA contractor report] -- NASA-CR-199044., NASA contractor report -- NASA CR-199044.
    ContributionsSuryanarayana, N. V., United States. National Aeronautics and Space Administration.
    The Physical Object
    Pagination1 v.
    ID Numbers
    Open LibraryOL17013607M

    The major loss, or friction loss, in a circular duct in galvanized steel with turbulent flow can for imperial units be expressed. Δh = q / d e (1). where. Δh = friction or head loss (inches water gauge/ ft of duct). d e = equivalent duct diameter (inches). q = air volume flow - (cfm - cubic feet per minute). For rectangular ducts the equivalent diameter must be calculated. is a ready reference to determine the size of a rectangular duct that equals the carrying capacity of a predetermined round duct. To use this chart, convert a rectangular duct with sides of 17 inches by 16 inches, respectively. First, come down the left-hand column until you reach 17 inches; then trace the line horizontally acrossFile Size: 2MB.   How to insulate rectangular ducts Siburl. Loading Unsubscribe from Siburl? Attic Duct Insulation Repair and Sealing - Duration: Johnny on Ene views.

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Film condensation in a horizontal rectangular duct by Jing LuМ€ Download PDF EPUB FB2

Film condensation in a horizontal rectangular duct (OCoLC) Material Type: Government publication, National government publication: Document Type: Book: All Authors / Contributors: Qing Lü; N V Suryanarayana; United States. National Aeronautics and Space Administration. Get this from a library. Film condensation in a horizontal rectangular duct.

[Qing Lü; N V Suryanarayana; United States. National Aeronautics and Space Administration.]. Condensation of a vapor flow inside a horizontal rectangular duct, using the bottom plate as the only condensing surface, was experimentally investigated.

The experimental measurements included condensate film thickness and heat transfer coefficients with R and FCCited by: Lu et al. [] represented the process for measuring condensate film thickness by ultrasonic technique.

Experimentally, they used R and FC to measure the condensate film thickness on the horizontal lower surface of Film condensation in a horizontal rectangular duct book rectangular duct at different points in the axial direction. The work of Huang et al. [14] focused on the heat and mass transfer in a rectangular duct, with water film evaporation and condensation over the horizontal walls and an uniform inflow of moist air.

(Problem in the Book) A horizontal tube of mm outer diameter, with a surface temperature of 34oC, is exposed to steam at bar. Estimate the condensation rate and heat transfer rate per unit length of the tube. Schematic: Assumptions: (1) Laminar film condensation, (2) Negligible non-condensibles in Size: KB.

To install an over the range microwave, you need a section of rectangular duct, at least 3" long. This section allows the damper, which opens away from the microwave, to move.

Lowe's and Home Depot both had rectangular to 6" boots with only " of rectangular duct. So, you're stuck adding another piece to the damper room. Master Flow 6 in. x 5 ft. Round Metal Duct Pipe. Free delivery with $45 order. Set your store to see local. Master Flow 8 in. x 5 ft. Round Metal Duct Pipe.

The hardest part is getting the backing off of the tape but I used a trick learned from applying window film where you also have to peel the backing off. I applied a small piece transparent tape to both the backing and to the aluminum so that the pieces of tape extended beyond the piece of.

The experiments were conducted in a horizontal transparent acrylic resin duct with rectangular cross-section, as shown in Fig. length of the duct was 2 m; the width, W, was mm and height, H, was 25 hydraulic diameter of the duct, D h, was the experiments, liquid was pumped continuously from the receiving tank, returning either through working section or Cited by: Ducting and Sheet Metal.

Rectangular Duct. Rectangular Duct. Contact Us: () | After Hours Emergency Contact: () All Product Lines HVAC Residential HVAC Commercial HVAC Refrigeration Foodservice Parts & Supplies.

Sales &. Internal flow of pure vapor experiencing film condensation on the walls of a straight horizontal duct is studied. The commonly occurring annular case of turbulent (or laminar) vapor flow in the core and laminar flow of the liquid condensate—with or without waves on the interface—is by: 3.

To prevent the dripping of condensate on the film, the experiment was conducted inside a horizontal rectangular duct with vapor condensing only on the bottom cooled plate of the : John W. Rose. Rectangular Sheet Metal Duct. One end will have an end cap and the other end will be raw, notched at 1/2" for easy field modification.

$ Add to Cart. Quick view. Duct Work 12" x 8" x 36" Long With End Cap HVAC Duct. Rectangular Sheet Metal Duct. One end will have an end cap and the other end will be raw, notched at 1/2" for easy field.

(Ducts) The equivalent diameter of a circular duct that provides the same pressure loss as a rectangular duct (see Figure) is given by the Huebsher equation: d (a b) (a + b) de is the equivalent diameter (mm or in).

a is the rectangular duct width (mm or in). b is the rectangular duct height (mm or in Figure: Rectangular to circular ducting de a.

A duct system often begins at an air blowers in the air handler can create substantial vibration, and the large area of the duct system would transmit this noise and vibration to the inhabitants of the building. To avoid this, vibration isolators (flexible sections) are normally inserted into the duct immediately before and after the air handler.

An investigation has been made of turbulent film condensation on a horizontal elliptical tube. The present study is based on Colburn analogy [] and potential flow theory to determine the high tangential velocity of vapor flow at the boundary layer and to define the local interfacial shear owing to high velocity vapor flow across the tube surface.

The condensate film flow and local/or mean Cited by: 3. Duct Sizing - Equal Friction Method - The equal friction method for sizing air ducts is easy and straightforward to use; Ducts - Diameter and Cross-Sectional Area - Circular ducts and cross-sectional areas; Equivalent Diameter - Convert rectangular and oval duct geometry to a equivalent circular diameter - online calculator with imperial and SI.

@article{osti_, title = {Two-phase flow patterns and frictional pressure gradients in a small rectangular channel}, author = {Wambsganss, M W and Jendrzejczyk, J A and France, D M and Obot, N T}, abstractNote = {In horizontal flow through a rectangular channel, the channel cross section can be oriented so that the long side is either vertical or horizontal.

The Condensation Shop offers a wide range of products to suit numerous condensation and damp related issues. If you would like assistance in selecting the correct product for your specific problem please call our helpful Sales Team onduring normal opening hours.

Inside Horizontal Tubes. As condensation occurs inside a horizontal tube, some liquid pools in the bottom. This reduces the flow area and changes heat transfer. To account for this, the gravity driven condensation equation becomes As with vertical tubes, the designer should use the larger of the gravity or vapor shear controlled forms.

Condensate inside A/C ducts I installed central air in a ranch house a few years back. The duct insulation is R I am having issues with quite a bit of water collecting inside the duct work over the winter.

I know this must be condensation from indoor air going into the ducts in the attic. Wall effects on rectangular ducts would also be expected to play a larger role on a rectangular duct because of the impact of the corners.

In the corners, the velocity drop off is greater because the flow is impacted by viscous shear stresses from velocity gradients in two planes (corresponding to the adjoining walls) as opposed to one plane. Starting with the basics, let's start at the most elementary level by identifying components of a duct system.

A duct system is a network of round or rectangular tubes—generally constructed of sheet metal, fiberglass board, or a flexible plasticand- wire composite—located within the walls, floors, and Size: KB.

straight rectangular duct. Cross section of the rectangular duct is × mm and length of the duct is 1 m. Data given: Temperature at the inlet of the duct = K Outside temperature = K; Inlet velocity= m/s Mass flow rate through the duct =×10^-3 kg/sec Analytical solutions The velocity profile through the duct can beCited by: 1.

Sheet Metal Connectors, Inc. (SMC) TDC, Slip/Drive and Raw Sheet Metal Connectors, Inc. rectangular duct and fittings are one part of our complete line of HVAC products. SMC manufactures coil line ductwork in 4’-5’-6’ lengths. All ductwork comes standard with stiffening beads. Condensation Problem in the Ductwork in Wintertime Question I have a dedicated ductwork system with the air handler in unconditioned attic.

When outside temperatures drop down below about 40 (pretty much Nov thru March) condensation starts forming in the ducts and drips from some of the ceiling registers. Publisher's Note: Products purchased from Third Party sellers are not guaranteed by the publisher for quality, authenticity, or access to any online entitlements included with the product.A single reference source covering all aspects of heat transfer problem-solving in engineering.

Written by the most eminentengineering authorities in the field, this authoritative and comprehensive Handbook. Duct and Duct Fittings are 26 GA. All Duct is Cross broke except 8"x8" Sections sold complete with S+Drives. 2 pc per section. Carton, Skid & Rack Quantity Available.

10" and 12" depth and other guages available. Insulated Duct also available. 16" Long/4" Reduction. 8" Long/2" Reduction. (2x8, 4x8, 6x8, 8x8, 10x8) (2x8, 4x8, 6x8, 8x8, 10x8). REFRIGERANT FORCED-CONVECTION CONDENSATION INSIDE HORIZONTAL TUBES by Soonhoon Bae John S. Maulbetsch Warren M.

Rohsenow Massachusetts Insitute of Technology. ABSTRACT Condensing heat transfer rates inside a horizontal tube were investigated -for large quality changes across the tube. The proposed correlation is a modification of the work of. The Model Broan Horizontal Steel Elbow for in.

x 10 in. duct can help save valuable cabinet space. Maximize the air and sound performance of your Broan range hood using this ducting accessory. It is made from gauge galvanized steel for long life.

x 10 in. horizontal discharge transition is designed for hood installations/5(2). NOTES FOR SPECIFIER; DUCT CONSTRUCTION Ductwork and supports shall conform to the HVAC Duct Construction Standards, Metal, and Flexible, Second Edition, Where fittings of configurations not shown in the HVAC-DCS are shown on the contract drawings, they shall be constructed as though they were therein.

Rectangular Sheet Metal Duct. One end will have an end cap and the other end will be raw, notched at 1/2" for easy field modification. Product Videos. Custom Field. Product Reviews. Write a Review Write a Review × Duct Work 12" x 6" x 36" Long With End Cap HVAC Duct.

Rectangular Duct. Rectangular Duct; Pro-Fabriduct. Automated Duct Forming Iowa Precision Iowa Precision Automated Duct Forming Lines Rectangular Duct.

Pro-Ductomatic Front-End Coil Line. Automated Duct Forming Iowa Precision Iowa Precision Automated Duct Forming Lines. Note: When you press the Spacebar while adding a duct to existing ductwork, the new duct assumes the size of the existing ductwork.

The Options Bar displays the width and height of the existing duct, and the duct being added is drawn with those dimensions.

However, when you add a horizontal duct to an existing duct that displays as an end view (perpendicular to the view plane), the width and. Horizontal 90º Bend Rectangular Horizontal Bend with Female Fittings Suitable for above Kitchen cupboards External Dimensions (mm) Resistance (Pa) at flow rate Cat.

Product Type H W D 8 l/s 13 l/s 21 l/s 29 l/s 37 l/s 45 l/s 53 l/s 61 l/s x54mm 60 21 38 64 93 x 70mm - - - File Size: KB. Mixed convection flow through a rectangular duct with at least one of the sides of the walls of the rectangle being isothermal under the influence of transversely applied magnetic field has been analyzed numerically in this study.

The governing differential equations of the problem have been transformed into a system of nondimensional differential equations and then solved by: 1. rectangular duct & fittings; duct w/ connector. rectangular plenum. Condensation forms when the water vapor in the air drops out of suspension and condenses into a liquid form.

The colder the air, the more likely it is that water will condense. Condensation forms when warm, humid air comes into contact with a colder surface like your air conditioner’s ductwork. This colder surface then chills the surrounding. Menards® offers a wide range of ductwork pipe and fittings to help your ductwork systems run products are used for warm air return, supply, and exhaust systems.

Flexible duct can be installed in place of galvanized pipe in many applications if allowed by your local HVAC codes. In addition, its flexibility allows for easier installation in hard-to-reach areas. film and is thus a function of heat flux. For condensation, saturated vapor enters a condenser tube and forms either a thin liquid film around the perimeter of the tube (as an annular flow) or a liquid layer in the bottom of the tube and a gravity-controlled condensing film around the upper perimeter (as a stratified or stratified-wavy flow).Spiral Duct: Often the Best Choice in HVAC.

Over the past 2 decades, spiral duct has seen a massive increase in popularity world-wide. In Western Europe, where energy costs are much higher than in the U.S. and energy efficiency is critical, the benefits of spiral duct have long proven themselves in commercial and industrial applications.(1) Vertical Rectangular Enclosures.

(2) Horizontal Rectangular Enclosures. (3) Inclined Rectangular Enclosures. Other Correlations • Keep in mind that this chapter presents correlation equations for very limited processes and configurations.

• There are many other correlation equations for topics such as: • Condensation • Boiling.