Air cooled chiller with heat recovery

A heating, ventilation, air conditioning, and refrigeration (HVAC&R) system comprising:

• a compressor configured to circulate a refrigerant through a refrigerant loop of the HVAC&R system;
• a heat recovery heat exchanger configured to receive the refrigerant from the compressor and to place the refrigerant in a heat exchange relationship with a process fluid;
• a condenser configured to receive the refrigerant from the heat recovery heat exchanger, the compressor, or both, wherein the condenser is configured to cool the refrigerant;
• an expansion valve configured to receive the refrigerant from the condenser and to expand the refrigerant;
• a bypass valve configured to direct the refrigerant from the heat recovery heat exchanger, the compressor, or both directly to the expansion valve, such that the refrigerant bypasses the condenser;
• an evaporator configured to place the refrigerant in a heat exchange relationship with a cooling fluid and to direct the refrigerant to the compressor;
• a three-way valve configured to direct a first flow of the process fluid into the heat recovery heat exchanger and direct a second flow of the process fluid to bypass the heat recovery heat exchanger and mix with the first flow of the process fluid downstream of the heat recovery heat exchanger relative to a flow direction of the first flow of the process fluid through the heat recovery heat exchanger to produce a mixed flow of the process fluid directed to a load;
• and
• a controller configured to:
• adjust the three-way valve to a first position to direct both the first flow of the process fluid and the second flow of the process fluid;
• and
• adjust the three-way valve to a second position to direct the first flow of the process fluid and block the second flow of the process fluid,
• wherein the HVAC&R system is configured to receive the process fluid from a building, and the HVAC&R system is configured to output the process fluid to the building.

A heating, ventilation, air conditioning, and refrigeration (HVAC&R) system comprising:

• a compressor configured to circulate a refrigerant through a refrigerant loop of the HVAC&R system;
• a heat recovery heat exchanger configured to receive the refrigerant from the compressor and to place the refrigerant in a heat exchange relationship with a process fluid;
• a condenser configured to receive the refrigerant from the heat recovery heat exchanger, the compressor, or both, wherein the condenser is configured to cool the refrigerant;
• a pump configured to direct the process fluid to the heat recovery heat exchanger;
• a three-way valve configured to receive the process fluid from the heat recovery heat exchanger and to adjust between a recycle position and a building return position, wherein the three-way valve is configured to direct the process fluid from the heat recovery heat exchanger toward a building serviced by the HVAC&R system in the building return position, and wherein the three-way valve is configured to direct the process fluid from the heat recovery heat exchanger, to the pump, and back to the heat recovery heat exchanger to re-circulate the process fluid through the heat recovery heat exchanger and bypass the building in the recycle position;
• and
• a controller configured to:
• receive feedback indicative of a temperature of the process fluid exiting the heat recovery heat exchanger;
• adjust the three-way valve to the recycle position in response to a determination that the temperature of the process fluid exiting the heat recovery heat exchanger is below a threshold temperature value;
• and
• adjust the three-way valve to the building return position in response to a determination that the temperature of the process fluid exiting the heat recovery heat exchanger exceeds the threshold temperature value.