Which component is not needed in the air-conditioning system for the Convenience Store?

In an air-conditioning system, various components work together to maintain an efficient cooling environment. The air curtain is typically used in retail and commercial settings to create a barrier of air across an entrance to minimize the exchange of indoor and outdoor air, thus helping with temperature control and energy efficiency. However, it is not a core component of the air-conditioning system itself.

The other components listed—ACCU (Air Conditioner Condensing Unit), AHU (Air Handling Unit), and condenser drain pipe—are essential for the operation of the air-conditioning system. The ACCU is responsible for the heat exchange process and compresses the refrigerant, while the AHU circulates and conditions the air. The condenser drain pipe is crucial for managing the condensation that forms as the system operates.

In summary, while an air curtain enhances comfort and energy efficiency by mitigating airflow between conditioned and unconditioned spaces, it is not necessary for the fundamental operation of an air-conditioning system, making it the correct answer in this context.