Abstract:
A refrigeration system having a refrigerant circuit including a condenser, a flow control device, an evaporator, and a compressor connected in series. The compressor is configured to circulate a cooling fluid through the refrigerant circuit. The refrigerant circuit has an inlet line fluidly connecting the condenser to the evaporator and a suction line fluidly connecting the evaporator to the compressor. A heater is positioned to heat the cooling fluid during a defrost mode, and a pressure control is coupled to the refrigerant circuit downstream of the evaporator. In the defrost mode, the pressure control apparatus is configured to increase system pressure during the defrost mode to maintain flow of refrigerant into the evaporator and to control flow of cooling fluid to the compressor.
Abstract:
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.
Abstract:
A method of controlling a refrigeration system having a compressor (22), a condenser (24), an evaporator (28), and a variable speed condenser fan (44) is provided. The method includes determining if a change in an ambient temperature or a compressor suction pressure is greater than a predetermined threshold, determining a near-optimal condensing pressure/temperature if the change in the ambient temperature or the compressor suction pressure is above the predetermined threshold, setting a condensing pressure setpoint based on the determined near-optimal condensing pressure/ temperature, and setting a speed of the variable speed condenser fan based on the condensing pressure setpoint.
Abstract:
A refrigeration system includes an evaporator, a compressor fluidly connected to the evaporator to compress low-pressure refrigerant exiting the evaporator to high-pressure vapor refrigerant, a high-side heat exchanger fluidly connected to the compressor to receive the high pressure vapor refrigerant and dissipate heat therefrom, and an energy recovery device configured to extract work from the high pressure refrigerant flowing therethrough, the energy recovery device including a gear expander, a generator and a controller. The gear expander having a fluid inlet, a fluid outlet in fluid communication with the fluid inlet, and a mechanical power output for outputting mechanical power created by fluid passing between the fluid inlet and fluid outlet, the fluid inlet arranged between a high pressure output of the compressor and an inlet of the evaporator. The generator is mechanically coupled to the gear mechanical power output and operative to convert mechanical power produced by the gear to electrical power. The controller is electrically coupled to the generator, the controller configured to regulate electrical power produced by the generator and output the regulated electrical power.
Abstract:
An example refrigerant system according to an exemplary aspect of this disclosure includes, among other things, a refrigerant loop having at least a condenser, an evaporator, and a compressor. The compressor includes a motor in communication with a variable speed drive. The system further includes a cooling circuit including a pressure regulator downstream of a heat exchanger, the heat exchanger absorbing heat from the variable speed drive.
Abstract:
An apparatus for air-conditioning of watercraft and the like comprising: an electronically controlled variable- r.p.m. compressor, a main gas/water condenser (5), at least one environmental heat-exchanger (3) with an electronically controlled fan (14), at least one electronically controlled expansion valve (8), and at least one first electronic control unit (4) programmed for calculating continuously a temperature deviation detected (DeltaT = T_ad - T_a), and as a function of said temperature deviation regulating in combination, the r.p.m. of the compressor (1), opening of the flow valve (8), and the r.p.m. of the fan of the heat- exchanger (3).
Abstract:
The present application relates to asystem for dynamic control of the operation of a heat exchanger, the system comprising a heat exchanger (1), a plurality of injector arrangements (25a, 25b), a local sensor arrangement (29), and a controller (57), whereinthe local sensor arrangement (29) comprises a plurality of local temperature sensors (31a, 31b) being arranged to measure temperature values; and wherein the controller(57)is arranged to determine a difference between the measured temperature values and is further arranged to communicate with the valves(22a, 22b) of the plurality of injector arrangements (25a, 25b) to adjustthelocal amount of first fluid supplied by at least one of the injector arrangements (25a, 25b) in order to even out the determined difference. The application also relates to a method for the dynamic control of the operation of a heat exchanger in such a system.