Hot And Cold, How It Works

Being part of a product developer team, I get to sketch out the process of a product and exactly how it works. An example would be how air conditioners work. It is definitely not as easy as it sounds as there are a lot of detail that you cannot afford to miss and the process is quite complicated. Product development means attention to detail. Missing just one piece of the puzzle and the whole thing will be faulty.

How Split System Air Conditioning Works

Split system air conditioning is one of the modern inventions that we seem to really take for granted. Whenever the temperature outside starts to go up, we immediately flip on the switch without even taking into consideration how it actually works. Even though we often think that these machines cool down our homes simply by pumping cool air into them, it is actually much more complicated than that. Actually the hot air is removed from the house and then fed through the system where it is turned into cool air. This process goes on and on until your home has reached the temperature you have set on your thermostat.

ac-split

The Process

The split air conditioning unit, when compared to smaller ductless systems such as window units, is much larger and more complex.

  • It basically works by splitting the cold air from the warm within the system.
  • The cold side of these units contains the cold coil and the expansion valve and is usually placed within a furnace or air handler.
  • The cold air is then blown through the coil by the air handler and then throughout the entire house or building by a series of ducts.
  • The hot side of the system, also known as the condensing unit, is located entirely on the outside of the building.
  • One of the primary parts of the split system is the spiral coil which is quite long and shaped like a cylinder.
  • A fan is located within that blows air through the coil and a compressor that is resistant to the weather.
  • This has become the favored approach largely due to its highly affordable cost and the reduced amount of noise emitted from the machine.

Interestingly enough, besides the fact that the split air conditioning unit uses ducts and separates the hot air from the cool, there is no significant difference between it and the ductless window mounted units. These systems can also be installed in large buildings such as malls, factories, and office buildings where they are typically installed on the roof and can be quite massive. However, when buildings are particularly large these options can be problematic, in which case a chilled water system is the approach of choice.

Choosing Different Brands And Models

When you are in the market for a split air conditioning system, you will find that there are many different brands and models to choose form. You may also have to find a reliable contractor as well to install the system if you do not have any experience in this area. While at it, you may want to consider installing a centrifugal extractor ventilator as well. In order to whittle down the choices you have, it is a good idea to do some searching online for consumer reviews written by people just like you. This is an easy way to find the top rated systems out there without relying on the possibly biased opinion of a salesperson.

 

How the Heat Recovery Ventilator Works

A heat recovery ventilator is often installed in new homes as a way to evacuate stale, polluted air and bring in fresh air from the outdoors. A residential model will typically be designed to use two separate blowers, one to handle the fresh air and the other for the stale. It also features a heat exchange core which transfers the heat to fresh air without having to mix the airstreams. Lastly, there is a damper which is installed to automatically stop the cold air from defrosting. This article will briefly explain how these simple yet highly effective machines work.

Homes And Their Fresh Air

So, first of all, what brought on the need for the heat recovery ventilator? In the past, homes were not built that tight; you’ve probably heard the phrase, ‘drafty old house’ before. This made it very easy for cold air to get in. So, you have to turn up the thermostat to keep it warm during the winter months, hoping that the heatpump will last. The only problem here is that it can get very expensive and during the last 2 or 3 decades heating bills have skyrocketed. So in order to make homes more energy efficient they have been built much more securely with tight doors and windows and plenty of insulation. But now there is the problem of homes being so tight that they are sealing off the fresh air.

HRV

Looking At The Heat Recovery Ventilator

  • The heat recovery ventilator works in a similar fashion to the balanced ventilation system.
  • The only difference is that it uses the heat in the outgoing air to warm up the fresh air that is coming in.
  • They usually consist of a pair of fans with one being devoted to evacuating the old air and the other to bringing in the new.
  • There are several different passages inside of these machines which control the flow of the incoming and outgoing air.
  • The warmth from the old air is transferred to the new even though the two streams of air never actually touch.

Winter And Summer

These units work both in the summer and winter months. In the former they can be set to transfer the heat of the incoming air to the stale exhaust air that is being evacuated. While in the winter months they can really help to keep the heat inside of your home. However, one of the downsides is that the cold air can build up within the unit if the temperature goes down to 20 degrees Fahrenheit. Luckily these units are outfitted with a damper that routes warm air into the core to defrost it.

The heat recovery ventilator is an excellent addition to practically any home, and is essential to maintaining a healthy climate indoors. Even though some may think installing one would make a good DIY project, the truth of the matter is that this is a job that is better left in the hands of a professional.