The conversions used in HVAC efficiency metrics, such as those between SEER and SEER2, or EER and EER2, are indeed close estimates rather than exact conversions. These conversions are intended to provide a way to relate older metrics to newer standards after adjustments have been made to reflect changes in testing procedures or regulatory standards. The conversions are practical tools for comparison but should be understood as approximations rather than precise mathematical equivalents. System Type Application: • Category 1 (5-ton ≤ SEER/SEER2): Typically, SEER and SEER2 are the relevant metrics. If the system is a heat pump, then HSPF/HSPF2 would also apply. • Category 2 (5-ton > EER/EER2, IEER): For larger systems, EER, EER2, and IEER are more relevant. If these systems are heat pumps, then HSPF/HSPF2 and COP/COP2 would also be considered. Equations: 1. Cooling a. SEER & SEER2: • Seasonal Energy Efficiency Ratio (SEER) • Seasonal Energy Efficiency Ratio 2 (SEER2) • Conversion: 1. SEER = SEER2 × 1.045 2. SEER2 = SEER / 1.045 3. SEER = EER / 0.813 b. EER & EER2: • Energy Efficiency Ratio (EER) • Energy Efficiency Ratio 2 (EER2) • Conversion: 1. EER = EER2 1.04 2. EER2 = EER / 1.04 3. EER = SEER × 0.813 c. IEER: • Integrated Energy Efficiency Ratio (IEER) • Conversion: IEER=(0.02×EER@100%)+(0.617×EER@75%)+(0.238×EER@50%)+(0.125×EER@25%) o Example EER is 11: EER at 100% load = 11.0 EER at 75% load = 13.9 EER at 50% load = 18.4 EER at 25% load = 19.1 IEER=(0.02×11)+(0.617×13.9)+(0.238×18.4)+(0.125×19.1) IEER=0.22+8.5763+4.3792+2.3875 IEER= 15.563 IEER=~15.6 2. Heating a. HSPF & HSPF2 (Heat Pumps Only): • Heating Seasonal Performance Factor (HSPF) • Heating Seasonal Performance Factor 2 (HSPF2) • Conversion: 1. HSPF = HSPF2 × 1.18 2. HSPF2 = HSPF / 1.18 b. COP: • Coefficient of Performance (for Heat Pumps and sometimes Chillers) • Conversion: 1. COP = HSPF × 0.293 2. HSPF = COP / 0.293
First you state that outside temperature range for SEER calculation is 65F to 104F and on the next slide you conclude that it is 80F to 105F??? After your calamity video I guess I’ll go check the info somewhere else.
The conversions used in HVAC efficiency metrics, such as those between SEER and SEER2, or EER and EER2, are indeed close estimates rather than exact conversions. These conversions are intended to provide a way to relate older metrics to newer standards after adjustments have been made to reflect changes in testing procedures or regulatory standards. The conversions are practical tools for comparison but should be understood as approximations rather than precise mathematical equivalents.
System Type Application:
• Category 1 (5-ton ≤ SEER/SEER2):
Typically, SEER and SEER2 are the relevant metrics. If the system is a heat pump, then HSPF/HSPF2 would also apply.
• Category 2 (5-ton > EER/EER2, IEER):
For larger systems, EER, EER2, and IEER are more relevant. If these systems are heat pumps, then HSPF/HSPF2 and COP/COP2 would also be considered.
Equations:
1. Cooling
a. SEER & SEER2:
• Seasonal Energy Efficiency Ratio (SEER)
• Seasonal Energy Efficiency Ratio 2 (SEER2)
• Conversion:
1. SEER = SEER2 × 1.045
2. SEER2 = SEER / 1.045
3. SEER = EER / 0.813
b. EER & EER2:
• Energy Efficiency Ratio (EER)
• Energy Efficiency Ratio 2 (EER2)
• Conversion:
1. EER = EER2 1.04
2. EER2 = EER / 1.04
3. EER = SEER × 0.813
c. IEER:
• Integrated Energy Efficiency Ratio (IEER)
• Conversion: IEER=(0.02×EER@100%)+(0.617×EER@75%)+(0.238×EER@50%)+(0.125×EER@25%)
o Example EER is 11:
EER at 100% load = 11.0
EER at 75% load = 13.9
EER at 50% load = 18.4
EER at 25% load = 19.1
IEER=(0.02×11)+(0.617×13.9)+(0.238×18.4)+(0.125×19.1)
IEER=0.22+8.5763+4.3792+2.3875
IEER= 15.563
IEER=~15.6
2. Heating
a. HSPF & HSPF2 (Heat Pumps Only):
• Heating Seasonal Performance Factor (HSPF)
• Heating Seasonal Performance Factor 2 (HSPF2)
• Conversion:
1. HSPF = HSPF2 × 1.18
2. HSPF2 = HSPF / 1.18
b. COP:
• Coefficient of Performance (for Heat Pumps and sometimes Chillers)
• Conversion:
1. COP = HSPF × 0.293
2. HSPF = COP / 0.293
First you state that outside temperature range for SEER calculation is 65F to 104F and on the next slide you conclude that it is 80F to 105F???
After your calamity video I guess I’ll go check the info somewhere else.
65F to 104F is right one. Typing mistake the later one is.
Thanks for pointing it out.
COP is not the reciprocal of efficiency…!!
Efficiency of engine. Heat engine.
12000 Btu/h divided by 16 Btu/W.h= 750 W not 750 W.h ! 12000/18 is also the same
In the division, we use only 12000 BTU as heat removed. Not as 12000 BTU/hr
BTU/hr is capacity or power of refrigeration. whereas BTU is energy or heat removed. Hope you got it?