Refrigeration system with heat recovery

A refrigeration controller for controlling a refrigeration system, the refrigeration system including:

• a vapor compression circuit that includes:
• at least one compressor;
• a heat exchanger configured to exchange heat between refrigerant flowing in the vapor compression circuit and a fluid flowing in a hot fluid circuit;
• a valve configured to control a flow of refrigerant through the heat exchanger from the at least one compressor;
• a gas cooler having a first refrigerant path and a second refrigerant path;
• a receiver;
• a first expansion device fluidly connected between the first refrigerant path of the gas cooler and the receiver;
• a second expansion device fluidly connected between the receiver and the gas cooler;
• and
• at least one evaporator;
• wherein the gas cooler is arranged such that heat from refrigerant flowing in the first refrigerant path of the gas cooler is transferred to refrigerant flowing in the second refrigerant path of the gas cooler when the second expansion device is open and allowing refrigerant flow from the receiver to the second refrigerant path of the gas cooler;
• the refrigeration controller comprising:
• a processor configured to generate and send signals for controlling the at least one compressor, the valve, the first expansion device and the second expansion device.