Fundamentals of Refrigeration Practice Test

Higher ambient temperatures can decrease efficiency and cooling capacity in refrigeration systems. This is primarily due to the way refrigeration cycles operate. Refrigeration systems work on the principle of transferring heat from a low-temperature area to a high-temperature area. When the ambient temperature increases, the heat that the condenser coil needs to dissipate also rises. This puts additional strain on the system, causing it to work harder to expel heat.

As the ambient temperature rises, the temperature differential between the refrigerant inside the condenser and the surrounding air decreases. This can reduce the effectiveness of the heat exchange process, meaning the refrigerant cannot lose heat as efficiently. Consequently, the compressor may need to run longer or at a higher capacity to achieve the desired cooling effect, leading to decreased overall efficiency. Additionally, as the cooling capacity diminishes, the system struggles to maintain the required temperature levels, further impacting its operation.

In summary, high ambient temperatures hinder the refrigeration process, leading to reduced cooling capacity and efficiency, which is why this answer is correct.