A plate heat exchanger includes: a plurality of heat transfer plates including first to fourth through-holes to extend through the heat transfer plate, stacked in a single direction to isolate first and second water flow passages; and end plates including first and second inlet and outlet ports, and a connection port, that the heat transfer plates are sandwiched between The first inlet and outlet port, continuous with the first and second through-holes, allow a first fluid to flow into and out of the first flow passage. The second inlet and outlet port, continuous with the third and fourth through-holes, allow a second fluid to flow into and out of the second flow passage. The connection port is connected to a pressure relief valve provided separately from the plate heat exchanger.

A method of preventing evaporator coil freeze in a heating, ventilation and air conditioning (HVAC) system is performed by a controller in the HVAC system. The method includes determining a reference saturated suction temperature (SST) via a sensor disposed in relation to an evaporator coil in the HVAC system. The method also includes determining whether the reference SST is below a minimum SST threshold. The method also includes, responsive to a determination that the reference SST is below the minimum SST threshold, increasing a discharge air temperature (DAT) setpoint.

A water electrolysis system includes a water electrolysis device; a water circulation circuit section including a water circulation pump; an antifreeze circulation circuit section including an antifreeze circulation pump; and a heat exchanger configured to perform heat exchange between the water circulation circuit section and the antifreeze circulation circuit section. Before water electrolysis is started by the water electrolysis device, a control device of the water electrolysis system circulates water by driving the water circulation pump and sets the antifreeze circulation pump to an operationally stopped state.

An ice maker for forming ice having a refrigeration system, a water system, and a control system. The refrigeration system includes a compressor, a condenser, an ice formation device, and a condenser fan comprising a fan blade and a condenser fan motor for driving the fan blade. The water system supplies water to the ice formation device. The control system includes a controller adapted to operate the condenser fan motor at a first speed in a forward direction when the ice maker is making ice and adapted to operate the condenser fan motor at a second speed in a reverse direction when the ice maker is not making ice. Operating the condenser fan motor at the second speed in the reverse direction is sufficient to reduce the amount of dirt, lint, grease, dust, and/or other contaminants on or in the condenser.

An ice maker for forming ice having a refrigeration system, a water system, and a control system. The refrigeration system includes a compressor, a condenser, an ice formation device, and a condenser fan comprising a fan blade and a condenser fan motor for driving the fan blade. The water system supplies water to the ice formation device. The control system includes a controller adapted to operate the condenser fan motor at a first speed in a forward direction when the ice maker is making ice and adapted to operate the condenser fan motor at a second speed in a reverse direction when the ice maker is not making ice. Operating the condenser fan motor at the second speed in the reverse direction is sufficient to reduce the amount of dirt, lint, grease, dust, and/or other contaminants on or in the condenser.

The invention relates to a device and a method for icing prevention regulation for a heat pump evaporator (3) in air conditioning systems of vehicles, composed of a subsection (1) of a refrigerant circuit which can be operated both as a heat pump and also as an air conditioning system. The device comprises the heat pump evaporator (3), an electrical or mechanical refrigerant compressor (4), a cooler fan (9) which is attached to the heat pump evaporator (3) and which draws ambient air (11) upstream from and through the heat pump evaporator (3) at an adjustable flow speed, and which thus permits a permanent flow of ambient air (11) over the heat pump evaporator surface, a first temperature sensor (6) in or on the refrigerant line (5, 5a) upstream from the heat pump evaporator (3) with respect to the heat pump operating direction, and a control and regulating unit (8). The control and regulating unit (8) is connected via signal lines (10, 10a, 10b, 10c, 10e) at least to the first temperature sensor (6), to further sensors, in particular for detecting the ambient air temperature (Tu) and the vehicle speed (V.sub.F), to the expansion valve (2), to the cooler fan (9) and to the refrigerant compressor (4) for the direct or indirect regulation of the flow cross section of the expansion valve (2) and the rotational speed of the electric refrigerant compressor (4) or of the regulating valve of the mechanical refrigerant compressor (4) and for the actuation of the cooler fan (9) of the vehicle during heat pump operation.

An ice maker for forming ice having a refrigeration system, a water system, and a control system. The refrigeration system includes a compressor, a condenser, an ice formation device, and a condenser fan comprising a fan blade and a condenser fan motor for driving the fan blade. The water system supplies water to the ice formation device. The control system includes a controller adapted to operate the condenser fan motor at a first speed in a forward direction when the ice maker is making ice and adapted to operate the condenser fan motor at a second speed in a reverse direction when the ice maker is not making ice. Operating the condenser fan motor at the second speed in the reverse direction is sufficient to reduce the amount of dirt, lint, grease, dust, and/or other contaminants on or in the condenser.

An ice maker for forming ice having a refrigeration system, a water system, and a control system. The refrigeration system includes a compressor, a condenser, an ice formation device, and a condenser fan comprising a fan blade and a condenser fan motor for driving the fan blade. The water system supplies water to the ice formation device. The control system includes a controller adapted to operate the condenser fan motor at a first speed in a forward direction when the ice maker is making ice and adapted to operate the condenser fan motor at a second speed in a reverse direction when the ice maker is not making ice. Operating the condenser fan motor at the second speed in the reverse direction is sufficient to reduce the amount of dirt, lint, grease, dust, and/or other contaminants on or in the condenser.

A condenser cleaning system comprises of a cleaning unit with a mounting flange which is used to securely place the cleaning unit in between a condenser and a mesh. The mesh is placed on the cleaning unit using a bent edge. The cleaning unit has a cleaner that moves over a plurality of heat exchange fins of the condenser removing debris and the cleaner also moves over the mesh removing debris.

As the cleaner, preferably in a form of a brush roller, moves over the plurality of heat exchange fins, the cleaner displaces debris collected on the plurality of heat exchange fins.

A condenser cleaning system comprises of a cleaning unit with a mounting flange which is used to securely place the cleaning unit in between a condenser and a mesh. The mesh is placed on the cleaning unit using a bent edge. The cleaning unit has a cleaner that moves over a plurality of heat exchange fins of the condenser removing debris and the cleaner also moves over the mesh removing debris.

As the cleaner, preferably in a form of a brush roller, moves over the plurality of heat exchange fins, the cleaner displaces debris collected on the plurality of heat exchange fins.