Seer eer relationship

SEER vs EER - How to Use SEER and EER to Compare AC Units

seer eer relationship

The terms SEER, EER and COP are used to define the efficiency of an air There is a direct relationship between EER and COP, in that the. We often get asked questions about SEER ratings, but those that have done a little research know that EER is also a useful means of. EER VS. SEER RATINGS IN MINNEAPOLIS, MN. When it's time to install a new it's our goal to make long-lasting relationships with our clients by exceeding.

However, it should not be used to measure how efficiently your new air conditioner will operate or how much money you can expect to save without making a calculation. This is because, as discussed above, a SEER rating is only a rating based on a standard test across a specific seasonal temperature range.

Energy efficiency EER SEER HSPF COP

As such, use the calculation in the SEER section above to first figure out what your equivalent SEER rating would be for your climate zone, then make the best decision for your area. Simply put, SEER is a means of estimating how much energy your new unit will use in a year, accounting for seasonal changes. When to Use EER EER ratings are more commonly encountered with smaller window mounted air conditioners, but are being listed more frequently on energy tags.

You have to realize that the EER value will not give you an accurate representation of your energy bills over a typical cooling season. As such, EER is more effective if you live in an arid climate that is always hot, or if you are making some kind of calculation.

seer eer relationship

Some manufacturers will note it, but it is used far less frequently than a SEER value. However, they are being listed more frequently, so you might be able to find them!

seer eer relationship

In the end, the most important part is to compare apples to apples, and oranges to oranges. An air conditioning system uses power to move heat from one place to another place. When cooling, the air conditioning system is moving heat from the space being cooled usually a roomto somewhere it is unwanted usually outside.

SEER vs EER - How to Use SEER and EER to Compare AC Units

A heat pump uses the same principles, but it is moving heat from outside the cold side to the space being heated inside the living space. Where TC is the cold temperature and TH is the hot temperature. For space cooling, the cold temperature is inside the space; for space heating, the cold temperature is outside. All temperatures are expressed in Kelvin. As you can see from equation 2, as the difference between the hot temperature and the cold temperature increases, the COP becomes lower, and vice versa.

This means that an air conditioning system is more efficient when the room temperature is closer to the outside temperature and will use more power when there is a larger difference in these temperatures. Typical COP values for air conditioning and heat pump systems are in the range 2 to 4, or about a tenth of the theoretical maximum.

However, this helps to explain where the power is used in such a system. Consider the heat pump application shown in figure 1. The heat pump takes power from the environment and uses electrical power to move that power to the inside space.

More power is put into the house than used in electricity.

seer eer relationship

Observe that the electrical power consumed goes into the building. In practice some is expended as heat outside the building, so the actual COP will be slightly less than 4.

seer eer relationship

An air conditioner operates in the same way, but it is removing power from the space. Consider the figure above in reverse where 1 kW is used to move 3 kW of power from the space. The air conditioner puts 4 kW of power into the environment and this power must be dissipated by the condenser.

The air conditioning unit is using more power than is being consumed in electricity. However, in this case, all the power used to operate the air conditioning unit is dissipated outside and has no effect on the power removed from the space. Hence, the COP is equal to 3. The bizarre units of measurement originated in the US to measure the efficiency of an air conditioning system in a steady state.

Convert EER, SEER, COP for air conditioning systems : free online calculator

The units are therefore not dimensionless and EER can be measured only over time. Typically, with the system stable, one can measure the energy used over an hour period.

One measures the amount of cooling the system has performed during that time. Many writers erroneously consider the EER to be a ratio of power, not energy: Although incorrect, this view does have the advantage of allowing us to easily estimate the power used for a certain size of air conditioning unit. As an example, consider an air conditioning unit that is five tons and has an EER of The EER can be specified only at a specific delta temperature between inside and outside the space being cooledbecause as we see from equation 2, the efficiency changes with this delta temperature.

Seasonal energy efficiency ratio - Wikipedia

The EER is usually specified under the conditions shown in table 1. We convert the BTU energy and the electrical input energy to a common energy unit, namely Joule. One Wh equals Ws or J. However the SEER is a representative measurement of how the system behaves over a season where the outdoor temperature varies: The result is one number that may guide a prospective purchaser or owner of a system to compare one unit with another unit.

Assume the cooling season is days about six months.

seer eer relationship

Again, assume that on average throughout the season, the unit runs at two thirds of its capacity.