How does an air handling unit work? The air handler of an HVAC system uses a blower to remove air from the home, force it through a heat exchanger and distribute the conditioned air through a system of ducts back into the house. On most systems, the blower is a squirrel cage fan that simultaneously creates a vacuum to pull air out of the room and pressure to force it through the ducts. How does a Trane air handler work? How does a Gibson central air conditioner work? Heat transfers through conduction, radiation and convection. Conduction occurs by placing a pan on the heating element of the stove. Radiation heat takes place with radiators and glowing electric heaters. However, the forced air system uses a modified form of convection heat. Convection currents normally rise off a hot surface. The air handler forces air through the hot elements to direct the convection currents to the desired area. Central air conditioning, forced air furnaces and heat pumps all use air handlers.

In all these systems, a single air handler is usually responsible for both heating and cooling. The air handler includes a filter that removes particulate material from the air as it passes through. home central air conditioning systemWhen operating as an air conditioner, the circulation of air through the cold coils in the unit by the air handler lowers the temperature and reduces the humidity inside the building.parts of a car air conditioner system How does a fireplace heat exchanger work?york ac parts florida A fireplace heat exchanger works by drawing in cool air from the home and heating the air before discharging it into the home as hot air. There are two dif... How do you insulate vents under a house? An HVAC system uses ducts to provide conditioned air to the vents in the home.

Manufacturers insulate some ducts as they are constructed. What does an air handler do in an air conditioner? The air handler is the indoor part of the HVAC unit that contains a blower and coils for heating and cooling. In a HVAC system that uses a fossil fuel, the... How do you apply for a UK work visa? What are the advantages of using an Ashley Wood heater? What gases make up air? How does a non venting air conditioner work? Who sells White-Rodgers zone valves?"You're not making heat, you're moving heat," Colorado geothermal installer Jim Lynch says. Installations like Lynch's tap into the earth below the frost line--which always stays around 50 degrees Fahrenheit--to reduce a home's heating and cooling loads. All HVAC systems require energy-intensive heat movement, a task responsible for over half of the average house's total energy demand. Geothermal works more efficiently because the system's mild starting point creates an efficient shortcut to the target temperature.

Imagine a 100-degree Florida day or a 0-degree Michigan night: Spot the system 50 degrees, and it doesn't work so hard to get the house comfortable.Unlike wind and solar, geothermal's power source never varies.Bob Brown, vice president of engineering with equipment maker Water­Furnace, says, "The ground's there all the time. It's great for heating and it's great for cooling. All I've got to do is bury a plastic pipe, put fluid in and, lo and behold, I've got a great system."* In the ground: A water-filled, closed loop of 1-inch high-density polyethylene (HDPE) pipe ferries heat between the earth and the house. Pipes descend 4- to 6-inch-diameter vertical wells--the number and depth depend on the house's site and size--before ganging together in a header and bringing lukewarm water in through the basement walls. Drillers backfill each hole with bentonite grout (or new enhanced grouts, engineered with fly ash) to maximize thermal conductivity.* In the house: Pumps cycle water through the pipe loop to the heart of the system: the geothermal unit, which acts as furnace and air conditioner.

This machine uses refrigerant and the temperate water from the underground pipes to heat or cool air. The air is then circulated through standard ductwork. With a device called a desuperheater, the unit uses excess heat to warm up domestic hot water at no added cost. The results feel the same as those from any standard forced-air HVAC system.Air in the ducts (1), refrigerant in the geothermal unit (2), and water in pipes (3) flow past each other like interlocking gears. Water brought from underground transfers heat to the refrigerant, or absorbs heat from it, depending on the season. Like an air conditioner, the unit compresses or expands the refrigerant to raise or lower its temperature. Finally, the refrigerant, now heated to 180 F or chilled to 40 F, fills condenser/evaporator coils. Air in the ducts blows across the coils to be cooled or warmed, then flows through the house.* The bit: This mud-drilling bit grinds soft earth and funnels it back into hollow, 20-foot drill-shank sections.

Corkscrew auger bits, in contrast, pound through solid rock. A new mud bit spinning at 1000 rpm, pushing downward with between 300 and 500 pounds of pressure, is good for five 150-foot holes.* The pipe: Water-filled HDPE pipes absorb heat through their walls. This sawed-off cross-section shows two pipes fused in a butt joint made by pressing the molten edges together at over 500 F. The joint, stronger than the walls of the pipe itself, resists rust, rot and leaks for a purported 200-year life span.* The unit: A combined furnace and air conditioner, the geothermal unit manages all-season climate control from the basement. Using the same principles as a refrigerator, which removes heat from food, this machine and the buried pipe remove heat from the earth or from the house. Wired to a 50-amp circuit, it works without venting, combustion or risk of carbon-monoxide poisoning.Vertical coils (1) fuel a system by using less total HDPE pipe than horizontal coils (2), in which loops of pipe fill shallow trenches exposed to constant heat just below the frost line.

In pond systems (3), a blanket of water insulates coils anchored on racks. Hard ground can inhibit deep digging, stopping Colorado installers like Jim Lynch from doing simple vertical work: "Texas, Nebraska--that's some easy drilling down there," Lynch says. His clients receive options 2 and 3. If an existing system gets a geothermal upgrade, it may operate as geothermal 90 percent of the time, while the old boiler or furnace fires up only on the coldest days of the year. The payback period on retrofits averages 12 to 15 years; on new installations, it can get as low as three to six.A typical 2000-square-foot home in Commack, N.Y., was recently retrofitted with a geothermal system. Tax credits, the inefficiency of the existing system and a low-interest loan combined to create immediate savings. The monthly payment is now $24 lower than the old monthly HVAC expense.Installation cost: $30,000 -- $11,000 (tax credit) = $19,000Annual costs: $3945 (old system) -- $2076 (geo) = $1869 savedPayback period: $19,000 / $1869 = 10.17 yearsMonthly fuel costs for old system: $329Monthly geothermal costs: $173 (power) + $132 (loan) = $3051.