I live in the Middle East where the temperatures often are north of 50C in the summer. As long as the humidity is low, the AC units perform very well and cool the apartment easily. If relative humidity is high (usually we can tell this by the haze in the morning or when condensation start forming on glass windows), then the AC struggles to keep the house cool - but what's more interesting, it starts forming ice (on the cooling pipes) and this ice soon starts melting which leads to further issues that water starts leaking from the AC compressor unit. My question therefore is, how can the ice formation be explained, and what is its relation to humidity and cooling? In light of the comment below, I would like to clarify that I am not looking for a solution to the problem, I'm trying to understand the physics or the reasons behind it. I know that blasting some air through some of the drainage holes usually solves it; but I'm curious what is it specifically about humidity that makes this happen.

What is it specifically about humidity that makes this happen? In the atmosphere, Warm Air carries more water vapor than an equal volume of cold air, so this phenomenon connects heat with humidity. From the above chart, you can see how the warmer the air, the more saturated it may become.air conditioning unit ice up The freeezing process starts with the intake of warm, water vapor saturated air. installing a home ac unitThe coolent liquid in the system acts to lower the temperature of the water vapor below it's freezing point. how to replace fan motor in ac unitThis change of liquid to solid is called a Phase Transition, and it results in ice forming on the coolest surfaces of the air conditioner. The heat extracted from the outside air turns (by means of another phase transition), the liquid coolent into a gas, which a compressor then turns back to liquid, and the whole cycle restarts.

If you left out the air blower, it's the same system by which your refrigerator eventually converts the water vapor in the air within the fridge to ice, and deposits it on the icebox surfaces. A phase transition diagram. If the air was perfectly dry then, in a fridge, the food would cool down, without any ice build up, but perfectly dry air is rarely found.Browse other questions tagged cooling humidity or ask your own question.If so, AC Leakfreeze™ is the refrigeration repair and air conditioning solution for you. AC Leakfreeze™ is the most dependable, system friendly, polymer free sealant available to HVAC service technicians for AC repair. Since the introduction of AC Leak Freeze™, HVAC service technicians have changed their approach to refrigerant gas leak repair and prevention. The industry leading, polymer free technology used to formulate AC Leak Freeze™ provides the safest, easiest and most reliable leak repair solution on the market today for refrigeration repair, residential air conditioning unit repair and commercial air conditioning repair.

Our products are compatible with all of today’s refrigerants and oils. Whether a college dorm mini-fridge, or a commercial walk-in freezer, AC Leak Freeze™ is the only solution for safe, dependable leak repair. AC Leak Freeze™ is the ideal product for air conditioner unit repair and refrigeration repair. AC Leak Freeze™ will stop leaks of refrigerant gas in HVACR air conditioning and refrigeration systems in homes and commercial buildings. AC Leak Freeze ensures that the AC repair or refrigeration repair permanently seals leaks. AC Leak Freeze™ is suspended until it mixes with the refrigerant. AC Leak Freeze™ is activated by refrigerant escaping at the site of a leak — forming a chemical weld and sealing the leak.Summer is right around the corner which means air conditioning and heating contractors can expect an influx of service calls in the near future. Especially during the warmer months, homeowners might notice a dripping sound coming from their unit. The cause may be a frozen evaporator coil which can drastically reduce comfort levels when homeowners need them most.

So, why does this happen? To find out, we first need to explore how an air conditioning unit cools a home. The Joule-Thomson effect is a principle in thermodynamics that states that if everything is kept constant, as gas expands and the pressure decreases, the temperature will also decrease. Similarly, if a gas is compressed, the temperature will go up. To explain further, what we perceive as temperature is actually a measurement of energy in molecules. Slow moving molecules feel cold while fast moving molecules feel warm. This same process goes on inside an air conditioning unit. The evaporator coil houses refrigerant which expands inside of it. In turn, this causes the coil to cool. The unit then blows the unconditioned home air over the cooled coil. The refrigerant then absorbs the heat from the indoor air which is transferred outside the home. Why do Air Conditioners Freeze? Technically, it's the evaporator coil that freezes inside the unit. This coil transfers/evaporates hot air from inside the home and sends it outside.

One reason for a frozen evaporator coil is airflow restriction. Homeowners that neglect to change dirty air filters can experience air flow blockage due to clogged filtration. Closing off supply and/or return vents can cause issues with air flow as well. In turn, the cold air accumulates within the unit. Similarly, insufficient refrigerant or a restriction in the refrigeration system can cause a frozen evaporator coil. Inside the ac unit, refrigerant begins as a liquid, converts into a gas, and then back into a liquid, however the refrigerant level will remain the same. A leak or restriction in the refrigerant line is the likely cause for low refrigerant levels. Another issue that has not been discussed is attempting to cool your home too drastically. If your system is icing up when your thermostat is set below 70, you may be able to solve the problem by simply raising the temperature slightly. A frozen evaporator coil cannot properly transfer heat outside of a home. Condensation forms and essentially, the coil cools itself to the point of freezing.