Specifications include, but are not limited to: The chiller unit should be sized to pull down temperature to desired set point in max 24-hour period. A 6 Kw
in-line heater is currently used and the DNR may add an additional 6 Kw if necessary (not part of this RFQ) to
circulate culture water at 30 gpm. In-line heaters will be switched off when chilling water is necessary.
Minimum incoming water temperature is 50F in spring and potentially 65F in summer months.
The chiller shall be a split unit. Heat exchanger shell to be PVC with titanium coil, heat exchanger and
condenser will be no more than 30 feet from each other. The heat exchanger should have the capability to be
mounted to a wall with integrated Stainless Steel rack. Condenser will be located in a protected outdoor
location with ambient air temperatures.
Room air temperature can be set to the desired water temperature to minimize loss/gain from room air
temp. Room is insulated and equipped with a radiant tube heater (extending over biofilter/pump sump) and
an air chiller (former feed storage room). Room dimensions are 21 feet by 24 feet.
System will be used to culture walleye fry from a start temperature of 65 F to at most 75 F during multiple 30
to 35 day periods in the months of March through June. Secondly, the system may be used to “cold bank”
small fingerling at 50-55 F for periods for holding without feeding during the months of July to February.
During cold banking water exchange rate will be 10% or less.