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Monday, October 20, 2014

[BladeTec Month] 101 HVLS Fan

We are dedicating this month of October to discuss everything about HVLS fan. From the very basic question what is HVLS fan to explaining further detail of HVLS applications - from aviation, retail, barn, office to worship places. Everyone can benefit from HVLS fan and HVLS fan can be applied to any situation.

high-volume low-speed (HVLS) fan is a type of mechanical fan used in commercial and industrial settings. HVLS fans are generally ceiling fans although some come as pole mounted fans. Unlike residential ceiling fans that are typically 36- to 52-inches in diameter, HVLS fans have very large diameters that start at 8-feet and go up to 24-feet. HVLS fans move very slowly unlike standard fans which operate at high speed. With such large diameters, HVLS fans can move large amounts of air at low rotational speed– hence the name "high volume, low speed."
HVLS commercial ceiling fans can be found in livestock barns, warehouses, distribution centers, shopping malls, skating rinks and health clubs. Due to the rising costs of energy, HVLS fans are often used to supplement HVAC systems as they provide a stronger cooling effect while helping to maintain a constant temperature and humidity.
HVLS fans work on the principle that a breeze moving across your skin on a very hot day feels good. The cool moving air breaks up the moisture-saturated boundary layer surrounding the body and accelerates evaporation to produce a cooling effect.
No matter their size, ceiling fans produce a column of air as they turn. This column of air moves down and out along the floor. Called a horizontal floor jet, this deep wall of horizontal moving air is relative to the diameter of a fan, and to a lesser degree, the speed of a fan. Once the floor jet reaches its potential, it migrates outward until it meets a side wall or other vertical surface.
Under ideal conditions, an 8-foot fan produces a floor jet of air approximately 36 inches deep. A 24-foot fan produces a floor jet 108 inches deep, tall enough to engulf a human standing on the floor or a cow, its initial development purpose.
HVLS fans incorporate a motor, hub, and aluminum fins or blades. Commercial HVLS fans differ from residential ceiling fans with regard to diameter, rotational speed, and performance.

BladeTec HVLS Fan | HVLS Fan Indonesia | Tawada CleanTech
Thursday, October 2, 2014

Selamat Hari Batik Nasional Indonesia!!

Wednesday, October 1, 2014

Fabric duct solution unburdens data center build-outs part 2

Last time, we talk about how redIT need easier duct system to help them cool the space as their clients grow from time to time. DuctSox with its well-engineered fabric duct system offer a solution to help spot cooling that help redIT to save cost and keep clients happy.

This time, we will talk more about the installation and the design of the fabric duct.

Fabric Installation

Each fabric T connects to a sheet metal trunk line supplied by several redundant 55,000-CFM units by MarCraft. The AHUs are supplied by multiple redundant 440-ton chillers by the York division of Johnson Controls. Each air handler has a piped-in soft water supply for humidifying San Diego’s inherent dry outdoor air. Humidifying the air helps to maintain ASHRAE standards with respect to relative humidity and potential static electricity risks within the facility. The air handlers reside in a secure, remote outdoor yard, removing the risk of water pipe leaks in the datacenter.

The Ts are connected via a round metal/fabric collar adaptor called a DuctSox DuctBuckle. The DuctBuckle clamp is manufactured for the sole purpose of clamping tightly onto round metal connections without the use of screws or other fasteners. Each drop area can accommodate up to three Ts, which can produce higher cooling densities and greater flexibility of additional airflow. The Ts drop as low as necessary to accommodate the different heights of customer cabinets within the datacenter. The ends of each T’s run are capped; however, they can easily be removed for zippering in extra lengths in-line and extending airflow over a cage’s equipment rack reconfiguration.

The application’s needs necessitated a custom-designed suspension system. Typically, ceiling-hung round fabric ductwork in conventional applications is installed in long runs suspended by horizontal cable or cable/track hanging systems. The T’s bullhead would have obstructed this suspension method. Instead, Faulkner used thin, undetectable aircraft-style cable and adjustable clamps for attaining proper hanging tension. The vertical cables attach to the metal collar on one end. The Ts run on the other end where the manufacturer sewed in receiving clips.

redIT keeps an inventory of Ts, and redIT’s in-house staff can install these Ts for new clients in approximately 10 to 15 minutes without creating airborne debris. According to Faulkner, who supervises the fabric duct installations, installing and suspending a sheet metal drop and diffuser would require an outsourced contractor, a minimum one day of construction, plus the aforementioned risks to surrounding equipment.

Future Build-Outs

redIT is planning a new build-out phase, possibly using the same cooling design strategy. Until then, redIT’s ongoing green mission includes making the current system more efficient. They recently added a BAS by the Allen-Bradley division of Rockwell Automation. The system will control all of the air handlers’ economizer dampers to take full advantage of outdoor air when outdoor temperature and humidity are ideal.

Current refinements to the system include a matching blue fabric-based containment plenum above certain equipment to help contain cool air in and around the equipment for longer. This containment plenum creates more total energy efficiency and savings, according to Faulkner.

The fabric Ts are inherently flexible. Factory engineers can accommodate most any reconfiguration or special request for airflow, which according to redIT, has convinced many companies to become customers as they weigh their data center options.

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