Final answer:
In testing the efficiency of an air-cooled condenser with 10 SEER or lower, the refrigerant condensing temperature should be higher than the entering air temperature, ideal differential being 15 to 30 degrees Fahrenheit.
Step-by-step explanation:
When testing the efficiency of an air-cooled condenser with a Seasonal Energy Efficiency Ratio (SEER) of 10 or lower, it's important to assess the relationship between the refrigerant condensing temperature and the temperature of the air entering the condenser. The correct answer to this question is that the refrigerant condensing temperature should be no more than 'a) Higher' than the entering air temperature.
Efficiency of the condenser is crucial, as it dictates how well the system can reject heat. The condensing temperature should typically be around 15 to 30 degrees Fahrenheit higher than the incoming air temperature for a system to operate efficiently. This temperature differential allows the refrigerant to release its heat to the surrounding air effectively.