energy savings calculation and/or rule of thumb 3

[reliabilitybuff]

How can I easily determine the air conditioning energy savings associated with raising office/room temperatures ?

 

R U an accountant???

Consider the comfort of the staff first, determine the ideal ambient temperature for the area.

Then study ways to reduce heat losses in the stucture, ie windows, walls, doors, ceilings, etc.

Get the staff involved in your energy reduction program, take suggestions.

The end result will probably allow you to maintain the same ambient tepmperature, AND at the same time reduce your energy overhead.

firetube

 

[electricpete]

I guess that the simplest model would be to assume that heat transfer is proportional to differential temperature. If it costs you $100 to keep the area 10F average below surrounding areas, then it would cost $50 to keep it 5F below surrounding areas.

But there's a lot of complexity that can be added. Doors opening and shutting, variable temperature programming over the course of the day, what are your surrounding areas... note that the heat transfer coefficient at one wall may be different than at another wall.... which is a complication if you have various differential temperatures to consider (outside, office on other side of wall, etc).

 

[Bhandari]

The quick way is to try eQuest (which you can download free of cost at

http://www.DOE2.com).

As it can assume many default values and is very easy to learn. In your case just give the size of room/building and use eem wizard to vary your temperatures for finding energy savings. It can be used for detailed calculations.

Happy savings!

Bhandari

 

[MartinWG]

You can use Psychrometric Charts to determine enthalpy changes changes based on Relative Humidity and Temperature changes. This will give you the changes in KJ/KG and that can be the basis of some cost estimations.

Carrier supplies these charts.

 

[GaneshJ]

Hi!
i do not know whether u c this message as 'a bit late'..but the answer is..increasing ur room temperature means increasing ur evaporator temp (in ur air conditioning system)..so by increasing ur evaporator temperature..the COP(Coefficient of performance) of the air conditioning system will incresae and hence energy savings....

for u to calculate the COP..u will have to refer ur engg. books..

Good Luck

Ganesh

 

[illhp]

By raising the temperature, the temperature difference between the controlled environment(inside) and uncontrolled environment(outside) will decrease. Therefore the conductive losses will also decrease. The energy savings would be equal to the Ufactor * the area * the increase in the temperature setting for each type of surface in the office or room.