how does a commercial ac unit work

Remove heat from an enclosed region. Refrigerant, compressor, expansion valve (flow control device), evaporator, condenser, pipes and tubes. EXPLANATION OF HOW IT WORKS/ IS USED: Refrigerant flows through the compressor, which raises the pressure ofNext the refrigerant flows through the condenser, where it condenses from vapor form to liquid form, giving off heat in the process. The heat given off is what makes the condenser "hot to the touch." After the condenser, the refrigerant goes through the expansion valve, where it experiences a pressure drop. refrigerant goes to the evaporator. The refrigerant draws heat from the evaporator which causes the regrigerant to vaporize. The evaporator draws heat from the region that is toThe vaporized refrigerant goes back to the compressor to restart the cycle. Compressor: Of the reciprocating, rotary, and centrifugal compressors, the most popular among domestic or smaller power commercial
refrigeration is the reciprocating. The reciprocating compressor is similar to anA piston is driven by a motor to "suck in" and compress the refrigerant in a cylinder. As the piston moves down into the cylinder (increasing the volume of the cylinder), it "sucks" the refrigerant from the evaporator. intake valve closes when the refrigerant pressure inside the cylinder reaches that of the pressure in the evaporator. When the piston hits the point of maximum downard displacement, it compresses the refrigerant on the upstroke. The refrigerant is pushed through the exhaust valve into the condenser. Both the intake and exhaust valves are designed so that the flow of the refrigerant only travels in one direction through the Diagram of Compressor (Belt Driven In This Instance) Detail of Compressor Valve Components of Compresion Refrigeration In A Dorm Refrigerator condenser removes heat given off during the liquefication of vaporized refrigerant.
is given off as the temperature drops to condensation temperature. (specifically the latent heat of condensation) is released as the refrigerant liquefies. There are air-cooled and water-cooled condensers, named for their condensing medium. more popular is the air-cooled condenser. The condensers consist of tubes with externalThe refrigerant is forced through the condenser. cheap central air units for saleIn order to remove as much heat asac unit installation prices possible, the tubes are arranged to maximize surface area. compare central ac brandsFans are often used to increase air flow by forcing air over the surfaces, thus increasing the condenser capability to Evaporator: This is the part of the refrigeration
system that is doing the actual cooling. Because its function is to absorb heat into the refrigeration system (from where you don't want it), the evaporator is placed in the area to be cooled. The refrigerant is let into and measured by a flow control device, and eventually released to the compressor. of finned tubes, which absorbs heat from the air blown through a coil by a fan. tubes are made of metals with high thermal conductivity to maximize heat transfer. refrigerant vaporizes from the heat it absorbs heat in the evaporator. Flow control device (expansion valve): This controls the flow of the liquid refrigerant into the evaporator. Control devices usually are thermostatic, meaning that they are responsive to the temperature of the refrigerant. All variables are in units of per unit mass. From stage 1 to stage 2, the enthalpy of the refrigerant stays approximately constant, thus From stage 2 to stage 3, heat is put into the system, thus
qin = h3 – h2 = From stage 3 to stage 4, work is put into compressor, thus work = h4 – h3. From stage 4 to stage 1, heat is given off through the condenser, thus qout = h4 – h1. The coefficient of performance describes the efficiency the evaporator to absorb heat in relation to the work put in, thus b = refrigeration effect / work input = qin / work = (h3 – h1) / (h4 – h3). Heat transfer depends on the properties of the refrigerant. refrigerants will obviously have different enthalpy values for a given state. with one specific refrigerant, the enthalpy values depend on the temperatures and pressures in the warm and cold regions. temperature affects how well the refrigeration system is able to cool the enclosed region. Clearly, if the outside temperature is very hot (i.e. much above room temperature), the system may not be as successful in lowering the temperature of the enclosed region as it would at room temperature.
WHERE TO FIND COMPRESSION REFRIGERATION SYSTEMS: Moran, Michael J. and Shapiro, Hoaward N., Fundamentals of Engineering Thermodynamics, New York: John Wiley & Sons, Inc., � 1992. Langley, Billy C., Refrigeration and Air Conditioning, Reston Virginia: Reston Publishing Company, Inc., � 1982. For more info on Through the Wall, Window Units, Portable Air Conditioners or other LG Products... Describe your project and send it out to our top rated service providers.          No membership or credit card requiredGet StartedNo thanks, I'm not quite ready.This little solar gadget uses evaporative cooling to cut AC costs up to 30% By adapting a proven technology used in commercial AC units to home central air conditioners, Mistbox increases the efficiency of the units, saving up to 30% on AC costs.As we get closer to summer, keeping the inside of our homes cool begins to be one of our priorities, but running an AC unit to do so can come at a high cost, not just in money, but also in energy.
AC costs can quickly add up during hot weather, but there's a way to decrease those costs using just water, and it doesn't involve a swamp cooler or increasing the humidity within your home.One of the issues with central air conditioning units is the fact that during the times when you need it the most, the condenser unit, which sits outside the home, is forced to use the hot outside air to cool off the refrigerant. This leads to a harder-working AC unit and increased power consumption, which in turn translates into higher costs. However, by pre-cooling the immediate area around the condenser unit with a fine mist of water, AC units can run more efficiently, which reduces both power consumption and costs.Mistbox, which promises a quick and easy 5-minute installation, along with a set-it-and-forget-it computer-optimized control system, is a small solar-powered misting unit that mounts to the outside of the AC condenser, enabling the condenser to pull in cooler air for its operation during hot days.