Cooling device and image forming apparatus

A device comprising:

• a head to output liquid ink on a sheet;
• a dryer to dry the liquid ink on the sheet;
• a cooler to directly or indirectly absorb heat from the sheet which has ink and is received from the dryer to cool the sheet;
• and
• a plurality of cooling units respectively including:
• a plurality of coolant channels through which a coolant flows, the plurality of coolant channels disposed on or inside the cooler and arranged side by side in a sheet conveyance direction;
• and
• a plurality of liquid coolers to cool the coolant that flows in the plurality of coolant channels, respectively,
• the plurality of coolant channels including:
• a downstream coolant channel being downstream from at least one of the plurality of coolant channels in the sheet conveyance direction;
• and
• an upstream coolant channel being upstream from the downstream coolant channel in the sheet conveyance direction,
• the plurality of liquid coolers including:
• a heat device coupled to the downstream coolant channel and to absorb, with a refrigerant, heat of the coolant that flows in the downstream coolant channel;
• and
• a heat dissipater coupled to the upstream coolant channel and configured to dissipate heat of the coolant that flows in the upstream coolant channel.

A cooling device comprising:

• a head to output liquid ink on a sheet;
• a dryer to dry the liquid ink on the sheet;
• a cooler to directly or indirectly absorb heat from the sheet which has ink and is received from the dryer to cool the sheet;
• and
• a plurality of cooling units respectively including:
• a plurality of coolant channels through which a coolant flows, the plurality of coolant channels disposed on or inside the cooler and arranged side by side in a sheet conveyance direction;
• and
• a plurality of liquid coolers to cool the coolant that flows in the plurality of coolant channels, respectively,
• the plurality of coolant channels including:
• a downstream coolant channel being downstream from at least one of the plurality of coolant channels in the sheet conveyance direction;
• and
• an upstream coolant channel being upstream from the downstream coolant channel in the sheet conveyance direction,
• the plurality of liquid coolers including:
• a chiller coupled to the downstream coolant channel and to cool the coolant that flows in the downstream coolant channel;
• and
• a radiator coupled to the upstream coolant channel and to cool the coolant that flows in the upstream coolant channel.