An air-cooled chiller (100) includes a compressor (12); a cooler (14); a heat recovery heat exchanger (16), wherein the heat recovery heat exchanger is connected between an output of (12b) the compressor and an input header (20) of an air heat exchanger (60). A solenoid valve (30) is located in an input header (20) of the air heat exchanger to divide the input header into a first portion (20a) and a second portion (20b). A controller (32) is configured to control the solenoid valve (30). A second valve (34) is located in the output header (36) to divide the output header into a first portion (36a) and a second portion (36b). There is also provided a method of operating the air-cooled chiller and a method of retrofitting an existing serial-concept air cooled chiller, to provide the present air-cooled chiller.

The present disclosure relates to efficient condensing operations and apparatuses. Methods of fabricating condensers and specifically condenser surfaces are also disclosed. A condensing apparatus can include a condenser surface having a substrate and one or more layers of graphene. The substrate can be formed of nickel and a nickel-graphene surface composite layer can be formed. The substrate-graphene composite can be highly durable, hydrophobic, and resistant to fouling. Dropwise condensation can be induced.

The present disclosure relates to efficient heat exchanger components, such as pipe apparatuses including the same. Methods of fabricating heat exchange components are also disclosed. A condensing apparatus can include a condenser surface having a substrate and one or more layers of graphene. The substrate can be formed of nickel and a nickel-graphene surface composite layer can be formed. The substrate-graphene composite can be highly durable, hydrophobic, and resistant to fouling. Dropwise condensation can be induced.

Systems and methods for heating and cooling a vehicle using a heat pump are disclosed herein. In one embodiment, a system for heating and cooling the vehicle includes a heat pump having: a compressor located in an engine compartment of the vehicle, and an evaporator located in a sleeper or a cab of the vehicle. The system also includes a controller for selecting a cooling mode or a heating mode for the heat pump.

A refrigerator includes a cabinet that defines a storage space and a machine compartment that accommodates a compressor, a blow fan, and a condenser. The condenser is curved along front, rear, and side surfaces of the machine compartment. The condenser includes a first header disposed at a first end of the condenser, a second header disposed at a second end of the condenser, tubes that connect the first header and the second header to each other, heat exchange fins disposed the tubes, an input connection portion that extends from the first header toward the second header and is configured to supply refrigerant to the first header, and an output connection portion that extends from the first header toward the second header and is spaced apart from the input connection portion. The output connection portion is configured to receive the refrigerant discharged from the first header.

A refrigeration system has: (a) a fluid tight circulation loop including a compressor, a condenser and an evaporator, the evaporator having at least three evaporator zones, each evaporator zone having an inlet port, the circulation loop being further configured to measure the condition of the refrigerant with a refrigerant condition sensor disposed within the evaporator upstream of the evaporator outlet port; and control the flow of refrigerant to the evaporator based upon the measured condition of the refrigerant within the evaporator, and (b) a controller for controlling the flow rate of refrigerant to the evaporator based upon the measured condition of the refrigerant within the evaporator upstream of the evaporator outlet port.

A heating, ventilation, and air conditioning (HVAC) system includes a reheat valve configured to receive a refrigerant flow and regulate division of the refrigerant flow provided to a reheat coil and a condenser. The HVAC system also includes a condenser fan configured to draw a flow of outdoor air across the condenser and a controller communicatively coupled to the reheat valve and the condenser fan. The controller is configured to monitor a position of the reheat valve and to control operation of the condenser fan based on a correspondence between the position of the reheat valve and a threshold degree of opening.

A portable internal combustion engine system includes an internal combustion engine having a fuel storage container and a first output shaft, the internal combustion engine rotates the first output shaft; a compressor engaged with the first output shaft, the first output shaft to provide energy thereto; an evaporative coil within a first housing and in fluid communication with the compressor and to receive a refrigerant from the compressor; a first fan engaged with the first output shaft and to pull air over the evaporative coil; a first outlet in gaseous communication with the first housing and to expel cool air via a first blower; and a control system to operate the internal combustion engine, the compressor, and first blower expel cool air.

A dehumidifier is provided. The dehumidifier may include a case having an air intake opening and an air discharge opening, an evaporator arranged inside the case and having evaporating fins coupled to evaporating tubes, a condenser arranged inside the case spaced apart from the evaporator, a fan that flows air in a direction from the evaporator to the condenser, and a heat pipe assembly positioned in front of and behind the evaporator in the air flow direction spaced apart from the evaporator. The heat pipe assembly may include heat pipes and heat-conducting fins each having a heat pipe coupling hole formed therein to be coupled to the respective heat pipe. Heat pipes may include heat-absorbing pipe portions positioned in front of the evaporator, heat-dissipating pipe portions positioned between the evaporator and the condenser, and connecting pipe portions that connect the heat-absorbing pipe portion to the heat-dissipating pipe portion, respectively.

Systems and methods for heating and cooling a vehicle using a heat pump are disclosed herein. In one embodiment, a system for heating and cooling the vehicle includes a heat pump having: a compressor located in an engine compartment of the vehicle, and an evaporator located in a sleeper or a cab of the vehicle. The system also includes a controller for selecting a cooling mode or a heating mode for the heat pump. In one embodiment, the system includes a clutch for engaging the compressor with a transmission of the vehicle.