Side spraying indirect evaporation cooling unit along fresh air flow

The invention relates to a side spraying indirect evaporation cooling unit along a fresh air flow. The unit comprises a top layer, a bottom layer and a middle layer, the top layer is provided with an indoor hot air return port and an outdoor hot air exhaust port, the bottom layer is provided with an indoor cold air supply port and an evaporator, and the middle layer is provided with an air-air heat exchanger, a condenser, a spraying system and an outdoor fresh air supply port. Outdoor air enters a room from the outdoor fresh air supply port, sequentially flows through the spraying system, the air-air heat exchanger and the condenser and flows out of the room from the outdoor hot air exhaust outlet, and indoor air enters the room from the indoor hot air return port, sequentially flows through the air-air heat exchanger and the evaporator and flows into the room from the indoor cold air supply port. The evaporator is arranged below the air-to-air heat exchanger, the condenser is arranged on one side of the air-