Co2 warm liquid defrost with heating section control

A method of operating a refrigeration system, the method comprising:

• determining if a first condition is met, wherein the first condition is associated with a first measurable aspect of a first evaporator and the first condition is met when the first measurable aspect indicates that the first evaporator needs defrosting;
• and
• causing the first evaporator to operate in a defrost mode after determining the first condition is met, by:
• providing electrical power to a heater located inside of a heat box, wherein an amount of electrical power provided to the heater is determined by a controller to produce a predetermined amount of additional heat in liquid refrigerant to produce a heated liquid refrigerant;
• and
• using the heated liquid refrigerant to defrost the first evaporator;
• wherein the heat box is configured to pass the liquid refrigerant to a first evaporator and comprises the heater and a coil that the liquid refrigerant passes through before being passed to the first evaporator;
• and
• wherein the first evaporator, is configured to receive the liquid refrigerant from the heat box and when operated in a refrigeration mode, the first evaporator transfers heat from a space to the liquid refrigerant, wherein the first evaporator is positioned downstream from the heat box and at a separate location from the heat box.

A controller of a refrigeration system, the controller comprising:

• an input/output interface communicatively coupled to:
• a heat box configured to pass liquid refrigerant to a first evaporator, wherein the heat box comprises a heater and a coil that the liquid refrigerant passes through before being passed to the first evaporator;
• the first evaporator, which is configured to receive the liquid refrigerant from the heat box and, when operated in a refrigeration mode, the first evaporator transfers heat from a space to the liquid refrigerant, wherein the first evaporator is positioned downstream from the heat box and at a separate location from the heat box;
• and
• a processor configured to:
• determine if a first condition is met, wherein the first condition is associated with a first measurable aspect of the first evaporator and the first condition is met when the first measurable aspect indicates that the first evaporator needs defrosting;
• and
• cause the first evaporator to operate in a defrost mode after determining the first condition is met, by:
• providing electrical power to the heater, wherein an amount of electrical power provided to the heater is determined by the controller to produce a predetermined amount of additional heat in the liquid refrigerant to produce a heated liquid refrigerant;
• and
• using the heated liquid refrigerant to defrost the first evaporator.