What stores refrigerant until it is needed in the evaporator?

The correct answer is the receiver, which plays a crucial role in refrigeration systems. A receiver is a storage tank that collects the refrigerant in its liquid form after it has been condensed by the condenser. Its primary function is to store this liquid refrigerant until it is needed for the refrigeration cycle, specifically for use in the evaporator.

When the system operates, the refrigerant is pumped from the receiver to the expansion device, where it is allowed to expand and absorb heat in the evaporator. This storage capability is essential because it ensures that there is a sufficient supply of refrigerant available for the evaporation process, facilitating continuous cooling.

While the accumulator also stores refrigerant, its purpose is primarily focused on managing the refrigerant vapor and ensuring that only vapor reaches the compressor, thus preventing liquid slugging, which can damage the compressor. The compressor is responsible for circulating the refrigerant through the system, and the condenser is where the refrigerant is transformed from gas to liquid, but neither of these components serves as a storage tank for the liquid refrigerant.