If you use Air-Conditioning to cool your room or a large commercial place you could be wasting up to 30% of all the energy it consumes!
A C Working Priciples: Air Conditioning systems are designed and installed to cope with maximum cooling demands in the required room plus some margin to cope during hottest days of the year. When the Air Conditioner is switched ON the typical Air Conditioning systems operates continuosly until the room thermostate senses the set temperature and turns the A C OFF. As the room warms up, the thermostat switches the the Air Conditioner back ON and the the Cycle repeats.
A typical cooling cycle looks like this :
When the cycle starts the compressor pushes cooling energy in to heat exchanger which acts as an energy storage. At this stage, the system works with high efficiency because compressor operates efficiently when fully loaded.
In normal condition the energy storage is soon fully ‘charged up’. From this point onwards the compressor provides more cooling energy than the heat exchanger can take up (Thermodynamic Saturation)
It also happens many times due to high ambient temperature and heat load in the room that the Compressor can not provide more cooling to achieve the set temperature and runs continuosly for small gap between set temperature and actual room tempearature. (Thermodynamic Saturation)
Running the compressor beyond this stage does not increase the cooling effect any more. Its just waste of energy.
Thermostats : Thermostats typically use a bi-metallic strip that responds to temperature changes, and correspondingly increases or decreases the air pressure in the control tube to switch ON and OFF the compressor. Being an electromechanical device its performance is not sustainable for long time and further detariate on account of poor maintenance and service of Air Conditioner. The erratic performance of the Thermostat results in to thermodynamic saturation and consumes more power vis a vis required cooling.
Though all the room Air Conditioner /Commercial Air Conditioner are working on the same principles, their electric consumption vary according to the efficiency.
We have classified Air Conditioner in to 3 three categories.
Efficient Air Conditioner :- These are technically high, well engineered which precisely measures the temperature and operate the compressor accurately. These Air Conditioner are maintained and services regularly to get the best performance and are adequate in capacity vis a vis room size and heat load in the room. These Air Conditioner are High on its price and low on running cost.
Partly Efficient Air Conditioner :- These are technically low engineered and has high running cost. Due to poor service and maintenance, excess heat load in the room the thermostat does not operate efficiently, the set temp is not achievable and compressor keep consuming more power without giving the desired temperature. This is called thermodynamic saturation. i.e. the set temp is not achievable inspite of compressor running continuously. Its just waste of energy.
Inefficient Air Conditioner :- Normally Compressor should switch off once the set temp sensed by the Thermostat. But the thermostat being an electromechanical device, its performance is not sustainable for long time and it further detoriates due to poor maintenance and servicing of Air Conditioner. And Compressor runs continuously throughout t the day (Thermodynamic Saturation) i.e. the set temp is not achievable inspite of compressor running continuously.Its just waste of energy.
The large capacity package or ductable split A C also has the same basic working principles. Since these Air Conditioner are designed to cope up cooling requirement of large area they have two or three compressor which operates under the same principles and the same are classified under the above three category.