Eer and seer relationship

* Relation Between COP, EER and SEER - ME Subjects - Concepts Simplified

eer and seer relationship

The efficiency of air conditioners is often rated by the seasonal energy efficiency Ratio (SEER) 1 Relationship of SEER to EER and COP; 2 Theoretical maximum; 3 US government SEER standards The seasonal energy efficiency ratio (SEER) is also the COP (or EER) expressed in BTU/hr/W, but instead of being. RELATION BETWEEN COP, EER AND SEER. COP = N/W. N is the cooling effect say in watts. W is the work input in watts. EER. The Energy. SEER is a measure of an air conditioner's energy efficiency. Yet there is also another common rating called EER. Although they both measure.

The annual cost of the electric energy is: Hot climates have a much higher ground or surface water temperature than cold climates and therefore will not be able to achieve such efficiencies. Moreover, the ARI rating scheme for ground source heat pumps allows them to largely ignore required pump power in their ratings, making the achievable SEER values often practically lower than the highest efficiency air-source equipment—particularly for air cooling. When operated in heating mode, a heat pump is typically more efficient than an electrical resistance heater.

This is because a space heater can convert only the input electrical energy directly to output heat energy, while a heat pump also transfers heat from outdoors.

* Relation Between COP, EER and SEER

In heating mode, the coefficient of performance is the ratio of heat provided to the energy used by the unit. The heat pump becomes less efficient as the outside temperature decreases, and its performance may become comparable to a resistance heater.

eer and seer relationship

In the case of cold climates, water or ground source heat pumps are the most efficient solution. They use the relatively constant temperature of ground water or of water in a large buried loop to moderate the temperature differences in summer and winter and improve performance year round.

However, they are being listed more frequently, so you might be able to find them!


In the end, the most important part is to compare apples to apples, and oranges to oranges. At the end of the day, SEER and EER can be very useful for comparing different air conditioning units to one another, but are not the end of the road to increasing efficiency and decreasing energy costs.

Additionally, a SEER air conditioner will only run efficiency if it is installed properly. What good is spending the money for an awesome HVAC unit if it is installed improperly?

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

Here are some tips on how to pick a licensed HVAC contractor in your area: 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.

eer and seer relationship

Assume the cooling season is days about six months. Again, assume that on average throughout the season, the unit runs at two thirds of its capacity.

The cooling energy is: If the system has a SEER of 13, the total electrical energy used is: Therefore, the actual ratio observed in practice may differ widely from the published SEER, making it difficult to accurately estimate the energy to run the system during a season.

The law was changed in January and the table lists the old and new standards. A split system is one where the evaporator and condenser are in physically different places. The compressor is usually housed with the condenser and these are in one package that is usually installed outside or on a roof.

The metering device expansion device is adjacent to the evaporator and installed inside the space where the air used to cool the space can flow.

Introduction to the Enhanced Entity Relationship (EER) Model

A packaged system has all four major components evaporator, condenser, metering device, and evaporator in a single unit that is usually placed outside. Air ducts transport the supply and return air to the unit. However, this measures the efficiency of the system in heating mode, not cooling mode. Therefore it applies only to heat pumps or reversible air conditioning units and not to units that only cool a space. A variant of equation 7 applies: Then from equation 16, the COP is 2.

This means that 2. Put another way, for every 1 kWh of electrical energy used by the heat pump, 2. In this case, a smaller value represents a more efficient system. However, as we have seen, to be valid, this number must be reported at various operating conditions, especially the indoor and outdoor temperatures, and the difference between chilled water return and chilled water supply.