Altitude Correction Table for Wine Cellar Cooling Systems

If you live in a place like Vail or Park City, you already know that HVAC/R equipment has special requirements because of the altitude.

The same goes for wine cellar refrigeration equipment.  That’s why we asked our engineer to create a table that lists the correction factors for our cooling units at diffierent altitudes, listed below.

To use the table, multiply the BTUH correction factor times the CellarPro cooling unit BTUH to get the adjusted BTUH capacity.  Then, compare the adjusted BTUH vs the thermal load of your cellar.  If the cooling unit’s adjusted BTUH is greater than the peak thermal load, you should be all set!

Summary

The performance of mechanical cooling systems will be negatively impacted as altitudes increase because of reduced airflow. In the table below, we provide correction factors for airflow and BTUH at various altitudes – these correction factors should be applied when sizing our cooling systems. Please contact us for more information.

Altitude Correction Table (1)

Altitude (Feet) Airflow Correction Factor BTUH Correction Factor
1,000 0.98 1.00
2,000 0.95 0.99
3,000 0.93 0.98
4,000 0.91 0.97
5,000 0.89 0.96
6,000 0.87 0.95
7,000 0.85 0.94
8,000 0.81 0.93

(1) As altitudes increase, fans will produce reduced airflow, causing the cooling unit to be less efficient on both ends of the cooling system. On the cold side, the SST (saturated suction temperature) will be lower than optimal, and on the hot side, the SCT (saturated condensing temperature) will be higher than optimal – in both cases, the cooling unit’s performance will be diminished according to the correction factors listed above..

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