Large chilled water buffer VS smaller chilled water buffer
Cellar refrigeration, Steven Palvi, Winer cellar refrigeration,
We at Wynroete Verkoeling like to assist and educate our clients in all the fields of refrigeration. In this report we will discuss the effect of the chilled water buffer volume on your cooling plant. The minimum water buffer volume for a water chilling plant is roughly calculated by multiplying the total kW cooling capacity with 7,2. These calculations are based on units with a ^t of 5dc to prevent the unit from stop/starting more than six times an hour. By selecting only the minimum water buffer volume the full cooling capacity required to run the plant should be applied, but should the plant only be needed for a few hours per day, the night time can be used to store latent heat energy. I.e. if 15 kW cooling capacity is needed to cool down 2520L of water per hour from 12 to 7dc for 4 hours per day, the minimum water buffer volume of 107,58L are recommended. Should you have only say 10 kW cooling capacity available (due to equipment failure etc.) you can keep in mind that the other 20hours of the day could be used to store latent heat energy. According to Vergunst, a rough calculation can prove that by increasing the water buffer the total load of 15kW per hour would still be accomplished for four hours. I.e. should the water buffer be increased to 10080L and 20 hours are used to cool it down, allot of latent heat energy is stored and for the 4 operating hours a unit of only 3 kW cooling capacity per hour is needed. Keep in mind this is a rough ratio, but it is very affective and currently applied to smaller estates whom does not have the capital to invest in bigger units. So by having a bigger water buffer it is possible to switch on your cooling at a pre determined time to store latent heat energy especially for the harvest season with a intake of 5 days per week over a 7 day cooling period. Keep in mind that in the event of a power failure the smaller cooling unit will struggle to keep up since the cooling hours are decreased. SP
Contact Wynroete Verkoeloing for more info on the exact sizing of chilled water buffer tanks.
, Steven Palvi
, Winer cellar refrigeration
, Wynroete Verkoeling