What is true concerning frost build-up on...

Question 1 / 270705eccef9dbacbc34ba4d460b1

Question 1 of 270705eccef9dbacbc34ba4d460b1

What is true concerning frost build-up on the evaporator coils of a multi-box direct expansion refrigeration system?

Question 1 of 27070

What is true concerning frost build-up on the evaporator coils of a multi-box direct expansion refrigeration system?

🔍 Key Concepts

• Refrigeration cycle basics – what happens to heat at the evaporator and condenser • Effect of frost/ice on heat transfer – does frost make coils more or less efficient? • Defrost procedures – what is standard practice for defrosting evaporator coils in multi-box systems

💭 Think About

• Think about how a layer of frost on the evaporator affects air flow and heat transfer between the box air and the refrigerant inside the coils. • Consider why hot gas or electric heaters might be used in defrost, and what role the evaporator fan should or should not play during defrost. • Ask yourself: if you simply stop the compressor, what will happen to the frost already on the coils?

✅ Before You Answer

• Verify whether frost is an insulator or a conductor of heat in this context. • Check standard defrost methods: is hot gas / electric defrost normally done with fans running or stopped? • Confirm whether stopping the compressor alone actually provides a source of heat to melt the ice, or just stops further cooling.

Question 1 of 27070

What is true concerning frost build-up on the evaporator coils of a multi-box direct expansion refrigeration system?

the frost will increase the refrigeration effect

the frost can be removed by passing hot gas through the coils or energizing defrost heaters with the evaporator fan shut down

the frost can be quickly removed by simply shutting down the compressor

the frost can be removed by passing hot gas through the coils or energizing defrost heaters with the evaporator fan still running

Question 1 / 270705eccef9dbacbc34ba4d460b1

Question 1 of 270705eccef9dbacbc34ba4d460b1

What is true concerning frost build-up on the evaporator coils of a multi-box direct expansion refrigeration system?

Back

Question 1 of 27070

What is true concerning frost build-up on the evaporator coils of a multi-box direct expansion refrigeration system?