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SoCal Edison Study

Performance evaluation of Rooftop air conditioning units at high ambient temperatures

As temperatures rise, all 6 of AC systems, both standard
and high efficiency, require more power (kW) to cool the air.

Among all 6 AC systems tested, as ambient temperature rises, it requires more kW to cool the air.

As temperatures rise, all 6 of AC systems, both standard
and high efficiency, lose cooling efficiency.

Among all 6 AC systems tested, as ambient temperature rises, they become less efficient.

Study Findings

Conclusions

Operation of a vapor compression system at elevated ambient temperatures inherently results in a lower coefficient of performance (COP). For refrigerants operating in the vapor compression cycle, the COP degradation is greater than that for the Carnot cycle & varies between fluids.

2. All experimental and simulation studies reported a loss of performance for R-410A systems at elevated ambient temperatures by approx. -10% as compared to R-22.

SoCal Edison Study Paper

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Nist Study

impact of elevated ambient temperatures on capacity and energy input to a vapor compression system

As temperatures rise regardless of the refrigerant,
R22 or R410A, both AC systems lose efficiency (EER).

As temperatures rise both refrigerants, R22 and R410A,
lose capacity (Tons). *Note the large drop of the R410A.

Study Findings

Conclusions

The compressor power demand of the high efficiency units increased at a higher rate than that of the standard units as the ambient temperature increased.

2. As ambient temperatures approached extreme conditions the performance of all units’ compressors began to degrade.

NIST Study Paper

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Pacific Gas & Electric Study

Laboratory testing of Add-on evaporative Cooling Systems for rooftop units

Three of the five systems we represent were tested. (DualCool PC1, Peak+ PC2, & HydrEVAP PC4).

Small 8 Ton RTU tested. All systems showed improvements in efficiency

Study Findings

Conclusions

Many systems can produce a significant improvement in RTU performance • Up to 14% Demand Reduction (maximum observed) • Up to 29% Capacity Improvement (maximum observed) • May allow system to operate less frequently

2. Impact is greater at higher wet bulb depressions • Results representative of only one test RTU • R-410a systems likely to be more responsive

PG&E Study Paper

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SoCal Edison Study

Performance evaluation of Rooftop air conditioning units at high ambient temperatures

As temperatures rise, all 6 of AC systems, both standard and high efficiency, require more power (kW) to cool the air.

As temperatures rise, all 6 of AC systems, both standard and high efficiency, lose cooling efficiency.

Study Findings

Conclusions

SoCal Edison Study Paper

Nist Study

impact of elevated ambient temperatures on capacity and energy input to a vapor compression system

As temperatures rise regardless of the refrigerant, R22 or R410A, both AC systems lose efficiency (EER).

As temperatures rise both refrigerants, R22 and R410A, lose capacity (Tons). *Note the large drop of the R410A.

Study Findings

Conclusions

NIST Study Paper

Pacific Gas & Electric Study

Laboratory testing of Add-on evaporative Cooling Systems for rooftop units

Three of the five systems we represent were tested. (DualCool PC1, Peak+ PC2, & HydrEVAP PC4).

Small 8 Ton RTU tested. All systems showed improvements in efficiency

Study Findings

Conclusions

PG&E Study Paper

As temperatures rise, all 6 of AC systems, both standard
and high efficiency, require more power (kW) to cool the air.

As temperatures rise, all 6 of AC systems, both standard
and high efficiency, lose cooling efficiency.

As temperatures rise regardless of the refrigerant,
R22 or R410A, both AC systems lose efficiency (EER).

As temperatures rise both refrigerants, R22 and R410A,
lose capacity (Tons). *Note the large drop of the R410A.