![]() ![]() The water used for cooling the compressor and the condenser is cooled in the cooling tower kept at the top of the plant room, though it can be kept at other convenient location also. The refrigerant flows along the tube side of the condenser and water along the shell side, which enables faster cooling of the refrigerant. The condenser is of shell and tube type and is cooled by the water. The open compressor can be driven directly by motor shaft by coupling or by the belt via pulley arrangement. The semi-hermetically sealed compressors are cooled by the air, which is blown by the fan, while open type compressor is water cooled. The compressor can be either semi-hermetically sealed or open type. The plant room comprises of the important parts of the refrigeration system, the compressor and the condenser. There are three main compartments of the DX type of central conditioning systems (please refer the fig below): DX Central Air Conditioning Plant However, it is not always feasible to carry the refrigerant piping to the large distances hence, direct expansion or the DX type of central air conditioning system is usually used for cooling the small buildings or the rooms on the single floor. Since the air is cooled directly by the refrigerant the cooling efficiency of the DX plants is higher. In the direct expansion or DX types of air central conditioning plants the air used for cooling space is directly chilled by the refrigerant in the cooling coil of the air handling unit. Direct Expansion (DX) Type of Central Air Conditioning Plant In case of the chilled water system the refrigeration system is used to first chill the water, which is then used to chill the air used for cooling the rooms or spaces.īoth these systems have been discussed in details this article discusses DX system, while the next one describes chilled water system. In the DX system the air used for cooling the room or space is directly passed over the cooling coil of the refrigeration plant. You’ll learn: why you should digitize your HVAC inventory data, tips to maximize HVAC performance and lifespan, and ideas to make capital planning a breeze.There are two types of central air conditioning systems: Direct Expansion (DX) type of central air condition plants and Chilled Water type of the central air conditioning plants. That’s why we created a quick five-minute guide to better HVAC management. Improve Your HVAC ManagementĪt Building Engines we know how critical effective HVAC management is to high performing building operations. However, many facilities have a central computer to handle the complexity of managing multiple air handling units. You can control basic air handlers with something as simple as a thermostat. Sometimes there’s a small heating element just after the evaporator coil to control the air’s humidity before it enters the space. Finally, the blower pushes it through the ductwork and throughout the space. Then it moves across the evaporator’s cooling coil, which contains cold water or refrigerant to condition the air. The air continues through a rack of air filters. Avoid expensive post-sale surprises with this HVAC due diligence checklist. Many simply recirculate the cool air present in the space.ĭepending on the building, you could be stuck footing the bill for millions of dollars in HVAC repairs before the building can be occupied. However, not all air handlers use fresh outdoor air. Here, the return air typically moves into a mixing box and blends with warmer, vented in outdoor air. How an Air Handling Unit Works Air handler without mixing box or heating element.įirst, air returns from the space it’s ventilating, passing back through a duct to the air handling unit. Customized air handlers can be double the cost of standard units, but typically only specific applications like surgical suites or chemical laboratories require them. Such customizations can impact the size of the air handler and its interior components. If a standard air handling unit is not right for an application, you can design a custom air handling unit to meet the space and performance constraints. What if you have an unusual space? The sky is the limit when it comes to designing an air handler. Air handlers contain one of two cooling elements: chilled water or refrigerant. Discover how DivcoWest reduced energy consumption 55% and saved $270 a day on energy bills.Īn air handler is usually a large metal box containing a limited subset of the components of the refrigeration cycle. ![]()
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