component sizing

[Webber]

I understand the major components of the refrigeration cycle should be sized to match the cooling load. What is the downside to using a compressor that is too big for the application or an evaporator for that matter?

 

[imok2]

With a larger system then is needed for the load ,you get a lot of cycling on and off and you lose control of the humidity, more energy use , more ware and tare on equipment and more maintenance it's really a bad choice in my opinion

 

[quark]

imok is right on.

Case1: Only compressor is of bigger size.

Evaporator can't deliver dry gas at the required and the result is the liquid stroke and subsequent compressor damage.

Case2: Only evaporator is of bigger size.

This subsequently increases (beause of liquid accumulation in the evaporator)overall pressure in the system thus creating leaks and energy loss.

Case3: Chiller is of bigger capacity when compared to your demand load.

Capacity control becomes difficult. Hunting of the system takes place thus reducing the life of the equipment.

Regards,