Selecting the proper chiller barrel for your application depends on four basic sizing considerations:

Range

The desired temperature drop of the fluid measured as the difference between incoming and outgoing fluid temperatures.

Approach

The desired temperature difference between outgoing fluid and the refrigerant evaporating temperature.

Pressure Drop

Acceptable level of fluid pressure drop through the chiller barrel at computed gallons per minute (gpm) flow rate.

Capacity

Necessary heat removal (tonnage) at maximum operating load

After determining fluid temperature drop (Range), find the capacity table identified for the particular range. (If no table exists for that specific point, use the next lowest temperature range for which a table exists.) At the top of the table, various approach temperatures are given. Find the approach desired and read down the tons column until you reach a capacity adequate to do the job. The water pressure drop (psi) is listed next to the capacity figure. To determine gpm, multiply tons by the gpm factor, which is noted below each range chart.

Chiller barrels may be sized by other methods as well. Where the desired temperature range is known (difference between incoming and outgoing fluid), determine the Btu/hr capacity needed by multiplying the temperature range by gpm flow and convert to pounds of water per hour using the multiplier 500.

Range x gpm x 500 = Btu/hr

Another sizing method is by compressor capacity. Manufacturer curves showing compressor Btu/hr values serve as a simple guideline for selecting chiller barrels for a given system.

Also, Standard chiller barrels are rated to ARI standards and can be selected on a nominal system tons basis using the capacity charts in this catalog. This method, however, is recommended only for high temperature (air conditioning) systems.

Water Nozzle Location

The standard water nozzle location is on the right as you are facing the refrigerant connections. Special top, and left side connections can be ordered.
Technical Assistance and Custom Designs

Standard offers custom design services and computer performance projections on all heat exchange products to help you match product and application accurately. You are invited to contact your nearest sales representative or our office headquarters for prompt assistance.