Cut Air Conditioning Bills by 50%

The advent of Technology makes home office a reality. Many people are now working from home, communicating to the outside World through Computers/Internet. Home office doesn’t necessary need lots of space but they will need air-conditioning. This article will tell how one could beat that rise in electricity rate and cut more than 50% in air conditioning bill to cool the home office.

By reducing the space of cooling and by introducing spot cooling.

According to estimate, the air-conditioning bill can come to around S$850/= per year if one uses a standard HDB room for 10 hrs per day. Up to S$450/= or 50% of the bill can be saved.

Can you Explain?
In air-conditioning , about 30 to 40% of the cooling losses are through the walls and the infiltrated air that seep through door and window gaps. By moving the home office from a standard HDB room to a newly converted or partitioned smaller room, one can reduce the space of cooling and save as much as 35% and further, by using spot cooling, one can save another 18 to 20%.
What’s Spot Cooling?
Spot cooling is a term often related to temporary cooling or cooling of a specific area or equipment. Spot cooling has been used in industrial plants and factories for years. In our application, we refer to coolings directed to a room occupant.

Is Spot Cooling Comfortable?
For comfort cooling, room air should be around 25 oC @ 55% relative humidity. Air often leaves the cooling coil at around 15 oC with 100% relative humidity. As conditioned air picks up heat, it reduces its humidity; hopefully, by adjusting the thermostat, the air would reach the person at about 25 oC @ 55% relative humidity. Actual example indicates that this can be achieved when the thermostat temperature is around 28 to 29 oC, which is 3 to 4 oC differences from 25 oC. According to a rough estimate, for every degree rise in cooling air, one could save about 6-8% (derived from Psychrometric Chart) or total of about 25% energy saving for a 4 oC rise !

What about Housekeeping?
One should ensure
1) Air-conditioning system has sufficient charge of Freon. Experiments show that by undercharging Freon by 10%, it reduces cooling by 4%; however, ice would start to form at the coil when Freon level drops to 80%. According to some estimates, the cost of recharging can be recovered in a period of 3 to 4 months;
2) Air filters are often cleaned. Use disposable secondary filter if possible;
3) Evaporator and condenser are pressured-water cleaned at least once a year and chemical cleaned once every 2 years.


Anonymous said...

Does the Feron leak often?

Sky Juice said...

Freon are compressed to a pressure of more than 250 psi and send to the cooling coil to via copper tubing to absorb heat before returning back to the condensing unit for heat rejection and compression. These copper tubings are connected to the condensing unit and cooling coil using purposed made mechanical joints. Freon will leak from these joints if they are weakened. As Freon carries with it lubricating oil, one should find spot of oil stain around the joints if there is a Freon leak. Freon in window type air conditioning unit does not leak as often because the tubings are often braised or welded.

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