As an expert in the field of HVAC systems, I have witnessed firsthand the significance of comprehending the high side components of these complex systems. The high pressure side, also known as the discharge side, is a crucial part of the system that runs from the outlet of the compressor to the inlet of the measuring device. On the other hand, the low pressure side, or vacuum side, is where the compressor is located. While it is true that the compressor is often referred to as the “heart” of an air conditioning unit and does a majority of the work, it is important to remember that many system problems do not originate with the compressor. In fact, an early fault in the compressor often indicates that there is another underlying issue that has gone unnoticed.
This is why it is essential to have a thorough understanding of all the high side components and their functions. Whether it is a commercial or residential HVAC system, its purpose remains the same – to dehumidify the air and eliminate heat. It is important to note that while the air conditioner itself does not cool the building, it works in conjunction with other subsystems to regulate the temperature. One of these subsystems is the condenser, which serves as the heat exchanger and removes heat from the building, transferring it to the outside. The refrigerant used in HVAC systems plays a crucial role in this process. As it travels through the system, it changes from a gas to a liquid and back again.
The condenser is responsible for converting gaseous refrigerant into liquid form. In some cases, a heat pump may also have a condenser that collects heat from outside instead of removing it from a building. The expansion valve is another essential component of the condenser's function. It removes pressure from the liquid coolant, allowing it to expand and convert from liquid to vapor. This precise control of refrigerant flow is crucial for the system to function properly. Out of all the high side components, the evaporator coil is the most likely to require maintenance or replacement.
This coil contains the cold refrigerant received from the compressor, and as fan air passes through it, heat is removed from the air in the treated area. This process is what ultimately cools the building.
Chillers
are another type of high side component that comes in both air-cooled and water-cooled varieties. Their function is to remove heat from the liquid that passes through the pipes of a structure. In an air-cooled chiller, the condenser coils are cooled with air driven by a fan, and these units are typically located outdoors. Now that we have covered the basics of the high side components, let's talk about one crucial aspect – head pressure.Also known as discharge pressure or high side pressure, head pressure is generated by the compressor outlet side of an air conditioning unit and can be influenced by various factors. The size and speed of the condenser fan, overall condition and cleanliness of the condenser coil, and even the size of the discharge line can all impact head pressure.
