Solar Air conditioning (SAC) – Guilt-Free Comfort for Summers

Early summers usually bring a pleasant relief from the bone chilling winters, but come April & May, the summer heat starts taking its toll, both physically as well as mentally. And when it’s a tropical climate, as in most parts of India, the hot days can be all together stressful. The energy levels of individuals go down and so does their productivity.

This is when the modern day Air conditioning comes as a God Gift. A very large no. of Offices, laboratories, hotels, public buildings are nowadays fitted with air conditioning systems Orange County California Air Conditioning. Centralized Air conditioning Systems ensure cooling in every nook and corner of the working space.

While this all sound hunky dory, its not. Extensive air conditioning is synonymous to heavy power consumption (and wastage) leading to not just heavy electricity bills but also the dreaded frequent power outages. The next step is – of course – DG sets, to bring the desired comfort indoors, while puffing out clouds of black smoke with terribly high levels of sound pollution for the outside world and the environment to endure.

In the midst of saving ourselves from the fury of the nature, we are inadvertently attacking the nature more and more, which keeps returning even more furiously every now and then. One of the biggest points of concern thus is the impending danger due to the rising world temperatures (Global warming!! ). So what shall we do to survive and survive with comfort?

Let’s not forget we have an immense source of energy in the very Sun that we’re shielding ourselves from. One answer is Generation of power using sun’s energy. It’s free and for now we can safely assume, unlimited. Yes, solar energy can light up our homes and cook our food. But can it also cool our houses? The answer again is yes. Solar air conditioning, a revolutionary and upcoming technology, provides the answer.

Solar air conditioningrefers to any air conditioning (cooling) system that uses solar power. A liquid or a gaseous substance either accumulates on the surface of a solid, porous substance (adsorption) or is taken up by a liquid or a solid substance (absorption for providing the necessary cooling). In some processes supply air is directly conditioned, i. e. treated in terms of temperature and humidity

This thermally driven cooling and air-conditioning process is at the heart of every solar cooling system. The main principle of Sorption Assisted Air conditioning is shown in the graphic here. The solar energy is used to dehumidify the sorbent.

This is a 9 stage process. In Stage 1 to 2, Sorptive dehumidification of outside air takes place with simultaneous rise in temperature through the freed adsorption heat. Then the air is cooled in the heat reclamation rotor in the countercurrent to the exhaust air (stage 2 to 3). Air is further cooled (Stage 3 to 4) through evaporation-humidification; Thus the air inflow to the building has a lower temperature and less water vapor than the outside air. In Stage 4 to 5 Heating of the air takes place, and if necessary addition of water vapor. Then during Stage to 6 building’s exhaust air temperature is lowered through evaporative cooling in the humidifier. This exhaust air is heated (Stage 6 to 7) in the countercurrent to the air inflow in the heat reclamation rotor. The exhaust air is further heated (Stage 7 to 8) through external heat sources (i. e. solar thermal system). Finally in Stage 8 to 9 Sorption Rotor is Regenerated through the desorption of the bound water. Central air conditioning cools your whole house by circulating air through ducts that are installed within your home. The hot air from your home is pulled through these ducts in order to be transformed into cold air. Once the air is cold it is then pumped back down the ducts and cools your home. The duct system is based on a system of supply and return. Air continues to be circulated through the system in order to reach the desired temperature intended for your whole home. Considering the fact that your home will be one solid temperature, the central air system will work at a solid pace in order to cool your home.

Room air conditioning, better known as window or wall air conditioners, can only cool a certain amount of space. The unit is mounted into the wall or window of a specific room. The plus size to window air conditioning is that unless it is not a large unit it does not need its own, most of the air conditioners will plug right into a power outlet in your home. Window air conditioners are single, self sustaining units that exhaust heat and humidity from the specific room to the outside. Similar to how a car’s air conditioning works, the single unit will only be able to cool a certain square footage. For example; if you buy a unit in order to cool the downstairs of your home, depending on how big the space is, the whole downstairs could be cooled. But if you were to close doors only one area would be cool and the other areas that were cooled off would be sweltering hot. Same goes for the second story of your home. Hot air rises so all that hot air that was once in your house is now upstairs. Window or wall air conditioners do not take out any hot air from your home in order to recirculate it and turn it into cool air. This kind of air conditioning takes the hot air from outside and turns it into cool air in order to be circulated into your home.