In heating mode, the coefficient of performance is the ratio of heat provided to the energy used by the unit. There are a variety of technologies that will allow SEER and EER ratings to increase further in the near future. The SEER and EER of an air conditioner are limited by the laws of thermodynamics. For science and education. In 2011 the US Department of Energy (DOE) revised energy conservation rules to impose elevated minimum standards and regional standards for residential HVAC systems. SEER = (1 × EER100% + 42 × EER75% + 45 × EER50% + 12 × EER250%)/100, Total Heat (BTU/hr.) ** Also, practically, central systems will have an achieved energy efficiency ratio 10–20% lower than the nameplate rating due to the duct-related losses. (std. Since 2013 the ErP directive set SEER and SCOP. COP. h, then your cost per operating hour is: The energy efficiency ratio (EER) of a particular cooling device is the ratio of output cooling energy (in BTU/hr) to input electrical energy (in Watts) at a given operating point. Typical EER for residential central cooling units = 0.875 × SEER. = 4.5 x CFM x Δh (std. These ratio were calculated for only one measurement at full charge. COP (Heating Efficiency Coefficient) = Condenser Heating Capacity (kW) / Total Energy Expended (kW) Energy Efficiency Ratio (EER) The Energy Efficiency Ratio (EER) is the ratio of the cooling capacity (kW) achieved in the evaporator to the total electrical energy (kW) consumed by the appliance in a refrigerator.The EER In the United States, a residential electric customer is charged based on the amount of electric energy one uses. We can calculate EER from COP with this formula: It’s a fairly simple formula that connects COP with EER. For example, the first American Standard model on the list is 18.1 EER but 3.9 COP. Additionally, there are ground-source residential AC units with SEER ratings up to 75. First, we should discuss 2 long standing efficiency index standards. In the longer term, they take into account temperature fluctuations and standby periods to give a clear and reliable indication of the typical energy efficiency over an entire heating or cooling season. Why would I use it? Split-system central air conditioners installed in all other states outside the Southeastern and Southwestern regions must continue to be a minimum of 13 SEER, which is the current national requirement. Both temperatures must be measured using a thermodynamic temperature scale based at absolute zero such as Kelvin or Rankine. Convert kVA To Amps: Calculator + 3 Examples, 5 Best Residential Air Curtains For Home (36'' To 72'' Width). COP measures how many times more efficient the heat pump is than electric resistance heat with an efficiency of 100%. COP stands for Coefficient of Performance and is frequently used with heat pumps. is the outdoor temperature. The efficiency of air conditioners is often rated by the SEER ( Seasonal Energy Efficiency Ratio ). Designed for heat pumps and air-conditioning systems, COP … temperature, namely COP = Tmin/(Tmax-Tmin). S druge strane, oznake SEER i SCOP odnose se na sezonski učinak energetske učinkovitosti za hlađenje (SEER) odnosno grijanje (SCOP). The higher SEER units typically have larger coils and multiple compressors, with some also having variable refrigerant flow and variable supply air flow. The higher the number, the less electricity the air conditioner or heat pump consumes. Air conditioner sizes are often given as "tons" of cooling, where 1 ton of cooling equals 12,000 BTU/h (3.5 kW). [13] Some of these technologies include rotary compressors, inverters, DC brushless motors, variable-speed drives and integrated systems. EER, SEER, COP, IPLV are still frequent topics of discussion even though SCOP is the only recognized efficiency metric for data center equipment, as detailed below. air), Latent Heat (BTU/hr) = 0.69 x CFM x Δgr. [6] The regional approach recognizes the differences in cost-optimization resulting from regional climate differences. SEER is a higher value than EER for the same equipment.[1]. Hello Robert, that does seem odd. [citation needed]. Fortunately, you can easily convert COP from EER (as well as EER from known COP) with these two converters: Here is an EER to COP chart with some examples of COP values based on EER rating: We’ve calculated a few examples for you. This is based on a thesis written by a student at University of Colorado. The SEER is thus calculated with the same indoor temperature, but over a range of outside temperatures from 65 °F (18 °C) to 104 °F (40 °C), with a certain specified percentage of time in each of 8 bins spanning 5 °F (2.8 °C). The SEER rating is calculated by dividing the total number of BTUs (British Thermal Units) of heat removed from the air by the total amount of energy required by the air conditioner in watt-hours. HSPF Rating: What Is A Good HSPF Rating For Heat Pumps? Based on the first law of thermodynamics, we can derive that COP is calculated using the following formula: where Q is heat (provided to the system in the case of heaters and taken from the system in the case of cooling devices) and W is work (electricity). This is the (Btu/hr)/(Watts/hr) of a system at its expected overall performance for a typical year’s weather (temperature and humidity) at a given location. Beginning in January 2006 a minimum SEER 13 was required. There is no allowance for different climates in this rating, which is intended to give an indication of how the EER is affected by a range of outside temperatures over the course of a cooling season. Here’s the formula to calculate it for yourself, EER = .875 x SEER. In the case of cold climates, water or ground source heat pumps are the most efficient solution. [12] However, ground source heat pump effective efficiency is reliant on the temperature of the ground or water source used. = 4.5 x CFM x Δh (std. For example, by upgrading from SEER 9 to SEER 13, the power consumption is reduced by 30% (equal to 1 − 9/13). Definition 3: COP, coefficient of performance: COP is defined as the cooling load, in kW, to power input at the compressor, in kW. COP = Q (useful heat)/W (input work) ACH = CFM x 60/Area x Height ceiling. Take the following example; A heat pump that delivers 4000 … In a desert climate where the outdoor temperature is 120 °F (49 °C), the maximum COP drops to 13, or an EER of 46 (for an indoor temperature of 80 °F (27 °C)). [4] It is rare to see systems rated below SEER 9 in the United States because aging, existing units are being replaced with new, higher efficiency units. The refrigeration process with the maximum possible efficiency is the Carnot cycle. A heat pump with a higher SEER rating for cooling mode would also usually be more efficient in heating mode, rated using HSPF. Electric energy is usually measured in kilowatt-hours (kWh). The maximum EER decreases as the difference between the inside and outside air temperature increases, and vice versa. What is the annual cost of the electric energy required to operate the air conditioner? Air conditioning is about removing humidity from a room, and cooling the air, kind of like a refrigerator. The unit is operated 120 days each year for 8 hours per day (960 hours per year), and the electric energy cost is $0.10 per kilowatt-hour. ENERGY STAR qualified Central Air Conditioners must have a SEER of at least 14.5. 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. SEER stands for – Seasonal Energy Efficiency Ratio -. is the indoor temperature and Hot climates have a much higher ground or surface water temperature than cold climates and therefore will not be able to achieve such efficiencies. As an Amazon Associate we earn from qualifying purchases. For example, there is little cost benefit in having a very high SEER air conditioning unit in Maine, a state in the northeast US. T SEER is the rating system representing the energy efficiency of air conditioners and heat pumps. COP. Both ratings are useful when choosing products, but the same rating must be used for comparisons. The heat pump becomes less efficient as the outside temperature decreases, and its performance may become comparable to a resistance heater. – COP = 10551/3600= 2.93 • So for every 2.93 units of heat removed the system uses on unit of energy. Coefficient of Performance (COP) COP is a measure of the efficiency of your air conditioning compressor. The EER is related to the coefficient of performance (COP) commonly used in thermodynamics, with the primary difference being that the COP of a cooling device is unit-less, because the numerator and denominator are expressed in the same units. SEER. For a heat pump with the minimum 13 SEER cooling efficiency, this is typically below −10 °F (−23 °C).[14]. Save my name, email, and website in this browser for the next time I comment. "Cold climate" heat pumps are designed to optimize efficiency below 0 °F (−18 °C). Traditional AC systems with ducts have maximum SEER ratings slightly below these levels. An ideal resistance heater converting 100% of its input electricity to output heat would have COP = 1, equivalent to a 3.4 EER. 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. A Component-Based Model for Residential Air Conditioner and Heat Pump Energy Calculations. This is about 10 times more efficient than a typical home air conditioner available today. [13], A refrigeration cycle can be operated as a heat pump to move heat from outdoors into a warmer house. EER = -0.02*SEER^2 + 1.12*SEER. The SEER is complicated by other factors such as the “cooling load,” which is related to how many ve… A more detailed method for converting SEER to EER uses this formula: A SEER of 13 is approximately equivalent to an EER of 11, and a COP of 3.2, which means that 3.2 units of heat are removed from indoors per unit of energy used to run the air conditioner. {\displaystyle T_{H}} Maybe this is the reason: COP is calculated for max. 1 ton of cooling equals the amount of power that needs to be applied continuously, over a 24-hour period, to melt 1 ton of ice. Headquarter 1230 Higuera St. San Luis Obispo, CA 93401 805 547 2050 There are several HVAC metrics for energy efficiency. If you are considering a minisplit or split-ductless system, in addition to SEER, Coefficient of Performance (COP) is another great metric that can best help evaluate efficiency. [10] Carrier launched a 42 SEER ductless air conditioner during 2018 Consumer electronic Show (CES), held in Las Vegas. EER is generally calculated using a 95 °F outside temp and an inside (actually return air) temp of 80 °F and 50% relative humidity. The same issue in that it is snapshot of performance or based on only one set of operating conditions. The EER is calculated by multiplying the COP by 3.412 BTU/W⋅h as described above: Assuming an outdoor temperature of 95 °F (35 °C) and an indoor temperature of 80 °F (27 °C), the above equation gives (when temperatures are converted to Kelvin or Rankine) a COP of 36, or an EER of 120. SEER and SCOP measure annual energy consumption and efficiency in typical day-to-day use. What is Seasonal Energy Efficiency Ratio? With existing units that are still functional and well-maintained, when the time value of money is considered, retaining existing units rather than proactively replacing them may be the most cost effective. COP is … air), Sensible Heat (BTU/hr) = 1.1 x CFM x Δt (std. The terms SEER, EER and COP are used to define the efficiency of an air conditioning system. A residence near Chicago has an air conditioner with a cooling capacity of 4 tons and an SEER rating of 10. If they use a non-standard Tmin and Tmax, that might cause an alternate relationship between COP and EER. SEER = (1 × EER 100% + 42 × EER 75% + 45 × EER 50% + 12 × EER 250%)/100. COP … (std. The terms COP (coefficient of performance) and EER (energy efficiency ratio) describe the heating and cooling efficiency of air conditioners.They indicate the ratio of heating or cooling provided by a unit relative to the amount of electrical input required to generate it. The seasonal energy efficiency ratio (SEER) is also the COP (or EER) expressed in BTU/hr/W, but instead of being evaluated at a single operating condition, it represents the expected overall performance for a typical year's weather in a given location. EER = SEER*.875 *Simplified ** EER = -.02*SEER 2 + 1.12*SEER *Detailed **Multiplier of .875 varies by Climate : ... EIR in eQUEST how to convert from EER COP and HSPF. SEER, which is an acronym for seasonal energy efficiency rating, is a measurement used to describe the efficient use of energy by air conditioners. EER is generally calculated using a 95 °F outside temp and an inside (actually return air) temp of 80 °F and 50% relative humidity. Thank you. A = COP or EER @ 100% Load. SCOP (Seasonal Coefficient of Performance) geeft het seizoensgebonden rendement weer en bepaalt de energieklasse van de warmtepomp in verwarmingsmodus. Converter provides units and measures conversions. I’d be very interested to know your thoughts. [5] The United States requires that residential systems manufactured after 2005 have a minimum SEER rating of 13. Can you explain why the calculation of COP x 3.41 = EER doesn’t work for models on this Energy Star list? [11] Carrier is part of UTC Climate, Controls & Security, a unit of United Technologies Corp. These measurements are in SEER (central air conditioner units, Heat Pump cooling season), EER (window unit), HSPF (Heat Pump), AFUE (Furnace, boilers) and COP (heat pump, chiller). What is client-server mode? The EER uses mixed units, so it doesn't have an immediate physical sense and is obtained by multiplying the COP (or EER) by the conversion factor from BTU/h to Watts: EER = 3.41214 × COP (see British thermal unit). How to convert SEER to EER. The amount of heat to be removed is called “tonnage.” Measured in BTUs, the heat tonnage is divided by the watts of energy needed to remove it. The Southwestern Region consists of Arizona, California, Nevada, and New Mexico. The COP of an air conditioner using the Carnot cycle is: where Starting January 1, 2015, split-system central air conditioners installed in the Southeastern Region of the United States of America must be at least 14 SEER. The lower the kW/ton- the more efficient the system. Here is the reference for the thesis: Wassmer, M. (2003). It is generally used for determining the cooling efficiency. On air conditioner’s specification sheets we usually get EER rating (many times without SEER rating). However, the efficiency of air conditioners can degrade significantly over time.[3]. Residential split-system AC units of SEER 20 or more are now available. The higher the ratio, the more energy efficient the air conditioner is. air). The heat pump cycle is reversed in the summer to act as an air conditioner. A SEER of 13 can be approximated as an EER of 11.2 (using equation 13), or a COP of 3.6 (using equation 8). When operated in heating mode, a heat pump is typically more efficient than an electrical resistance heater. 16 SEER vs 14 SEER: Which AC Unit Is Better? However, one of the most basic heating/cooling metrics – Coefficient Of Performance (COP) – is not. The definition is very close to EER, but the units are different. B = COP or EER @ 75% Load. air) Latent Heat (BTU/hr) = 0.69 x CFM x Δgr. "SEER" redirects here. The term COP (Coefficient of Performance) can be simply defined as the ratio of heating or cooling generated verses the amount of work required to generate that heating or cooling. Hathaspace Smart True HEPA Air Purifier Reviews, check EER ratings of the best portable AC units here. You can see them here in the COP to EER chart: Coefficient Of Performance (COP) is a key metric for energy-efficiency of heating and cooling devices. The higher the measurement of energy efficiency rating is, the more energy you save! It's not hard to understand why there is confusion if you consider the rapidity of the code changes in regards to this type of equipment. air) 1 HP = 746 Watts HSPF = BTU heating /W. This equation is especially useful when we want to determine the Coefficient Of Performance for HVAC devices that use EER as a primary energy-efficient metric. COP (coefficient of performance) = BTUh output ÷ BTUh of Energy Input In other words COP is the same as EER but you convert the input to BTUh from watts by multiplying watts by 3.413. Room air conditioners, for example, are the ones that can be compared based on the use of EER ratings. In fact, the XC25 is the most precise and efficient air conditioner you can buy. [6], There have been many new advances in efficient technology over the past 10 years which have enabled manufacturers to increase their SEER ratings dramatically in order to stay above the required minimums set by the United States department of energy. T For other uses, see, This article is about the American definition of SEER. How to Convert SEER to EER or COP KW/TON HSPF. Window units are exempt from this law so their SEERs are still around 10. SEER*Stat can operate in one of two modes, "local" and "client-server". COP - Coefficient of Performance. The higher the SEER rating the more efficient your AC unit is and the less energy it consumes. The termkW/tonis commonly used for larger commercial and industrial air-conditioning, heat pump and refrigeration systems. Another Energy Measure: COP. The theoretical maximum COP for a difference of 2°F is about 100 (using equation 2), or 25 times more efficient. [9] GREE also released a 30.5 SEER rating mini split in 2015 as well. Total Heat (BTU/hr.) But when either replacing equipment, or specifying new installations, a variety of SEERs are available. Energy Model Building Survey. Also easy with one more bit of math added in. On the customer bill, the electric utility states the amount of electric energy, in kilowatt-hours (kWh), that the customer used since the last bill, and the cost of the energy per kilowatt-hour (kWh). SEER = (1.12-√ (1.2544-0.08*EER)) / 0.04. SEER (Seasonal Energy Efficiency Ratio) geeft de seizoensgebonden waarde van de energie-efficiëntie van het product weer en bepaalt zijn energieklasse in koelmodus. C C = COP or EER @ 50% Load. air) Sensible Heat (BTU/hr) = 1.1 x CFM x Δt (std. CADR Rating: What It A Good CADR Rating For Air Purifier? Substantial energy savings can be obtained from more efficient systems. • Conversion Formula : COP = EER x 0.293 • The COP represents the cooling effect in btu's or watts of a refrigerant cycle, compared to the btu or watts equivalent of … In europe : before 2013 air conditionner and heating systems were rated according to EER and COP. Values for SEER, is determined through averaging readings of different air conditions, to represent air conditioner efficiency throughout the season. You can check EER ratings of the best portable AC units here and convert them to COP as an exercise. We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to and affiliated sites. First, we convert tons of cooling to BTU/h: The annual cost of the electric energy is: Today there are mini-split (ductless) air conditioner units available with SEER ratings up to 42. Similarly, split-system central air conditioners installed in the Southwestern Region must be a minimum 14 SEER and 12.2 EER beginning on January 1, 2015. {\displaystyle T_{C}} and min. For example, if an electric load that draws 1.5 kW of electric power is operated for 8 hours, it uses 12 kWh of electric energy. It stands for Seasonal Energy Efficiency Ratio. H The maximum SEER can be calculated by averaging the maximum EER over the range of expected temperatures for the season. For most applications, the minimum or near-minimum SEER units are most cost effective, but the longer the cooling seasons, the higher the electricity costs, and the longer the purchasers will own the systems, the more that incrementally higher SEER units are justified. [7][8] During the 2014 AHR Expo, Mitsubishi unveiled a new mini-split ductless AC unit with a SEER rating of 30.5. SEER rating reflects overall system efficiency on a seasonal basis and EER reflects the system's energy efficiency at one specific operating condition. The SEER is based upon the energy it takes to remove a certain amount of heat from a room. Isto kao i kod EER-a, što je COP veći, performanse uređaja su bolje, odnosno operativni troškovi su manji. The energy efficiency ratio (EER) of a particular cooling device is the ratio of output cooling energy (in BTU/hr) to input electrical energy (in Watts) at a given operating point. The low EER rating devices (and hence COP) are battery-operated air conditioners. Take a few minutes to use this Savings Calculator to find out how much money you can save in one year and in 20 years. 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. In many cases, the Energy-Efficiency Ratio (EER) is specified on the specification sheets. The SEER should be at least 13 to be sold in the United States. COP (Coefficient of Performance) is an indicator of the efficiency of a heat pump. The annual cost of electric energy consumed by a 72,000 BTU/h (21 kW) (6 ton) air conditioning unit, operating for 1000 hours per year, with a SEER rating of 10, and an electric energy cost of $0.12 per kilowatt-hour (kWh) is: Example 2. The EER is 4.64 times COP. For the European definition, see, Calculating the annual cost of electric energy for an air conditioner, US Department of Energy Framework Public Meeting for Residential Central Air Conditioners and Heat Pumps (June 12, 2008) at 35– 36 (transcript), European seasonal energy efficiency ratio, Air Conditioning, Heating, and Refrigeration Institute, Learn how and when to remove this template message, "ANSI/AHRI 210/240-2008: 2008 Standard for Performance Rating of Unitary Air-Conditioning & Air-Source Heat Pump Equipment", Air Conditioning, Heating and Refrigeration Institute, "U.S. DOE Building America House Simulation Protocols, Revised October 2010",,, "DOE Finalizes New Energy Conservation Standards for Residential HVAC Appliances", "Carrier Launches the Most Efficient Air Conditioner You Can Buy in America", "9,000 BTU 42 SEER Carrier Single Zone Heat Pump System - 230 Volt - High Wall", "Most Energy-efficient Ductless Model on Market Provides Significant Heating Capacity in Extreme Cold Climates",, "Inverter Smart Source Unit Just Released up to 62.5 EER that's up to 75 SEER", A new measure for the energy efficiency of heating and cooling devices, Climate Impacts on Heating Seasonal Performance Factor (HSPF) and Seasonal Energy Efficiency Ratio (SEER) for Air Source Heat Pumps,, Heating, ventilation, and air conditioning, Wikipedia articles with style issues from October 2011, Articles with unsourced statements from November 2020, Creative Commons Attribution-ShareAlike License, This page was last edited on 30 November 2020, at 06:55. However, the EER specified on the specs is EER 100%. eQUEST Load Extractor. Highly innovative and highly efficient cooling systems Lennox ® air conditioners and heat pumps are leaders in efficiency, with SEER ratings of up to 25.00. A typical example would include comparing a 3 ton, 8 SEER air conditioner to a new 3 ton, 16 SEER … EER = BTU cooling /W. Electric power is usually measured in kilowatts (kW). Lower temperatures may cause a heat pump to operate below the efficiency of a resistance heater, so conventional heat pumps often include heater coils or auxiliary heating from LP or natural gas to prevent low efficiency operation of the refrigeration cycle. The measurement is defined and regulated by the Air-Conditioning, Heating and Refrigeration Institute. SEER above 20 is a very efficient system. EnergyPlus Portal. Based on the definition of COP, we can deduce a formula for estimation of EER rating based on COP. The same thesis used: COP_47 = -0.026*HSPF^2 + 0.624*HSPF. For scientific, educational and general purposes to convert from one unit to another. Seasonal Energy Efficiency Ratio is a measure of the seasonal cooling efficiency of a heat pump or a consumer central air conditioning system. The formula of how to convert EER to SEER is: SEER = (1 × EER 100% + 42 × EER 75% + 45 × EER 50% + 12 × EER 250% )/100. The term is defined as the ratio of energy consumption in kW to the rate of heat removal in tons at the rated condition. The Southeastern Region includes Alabama, Arkansas, Delaware, Florida, Georgia, Hawaii, Kentucky, Louisiana, Maryland, Mississippi, North Carolina, Oklahoma, South Carolina, Tennessee, Texas, and Virginia. They are important indicators of how much energy an A/C uses, and are a good way to gauge what products will best reduce energy usage in your home. D = COP or EER @ 25% Load. In 1987 legislation taking effect in 1992 was passed requiring a minimum SEER rating of 10. So, if you are designing for a space with somewhat constant internal loads that are independent of outdoor air temperature, EER is a good indicator.