A refrigerated display case includes sidewalls, doors, shelves, a cooling system, a cooling coil defrost system, product defrost lights, and a controller. The sidewalls and doors may define an inner volume of the refrigerated display case. The shelves are positioned within the inner volume of the refrigerated display case, are fixedly coupled with at least one of the sidewalls, and are configured to support a product. The cooling system provides cooling to the inner volume of the refrigerated display case and may include a cooling coil. The cooling coil defrost system provides defrost heating to the cooling coil. Each of the product defrost lights are oriented towards a corresponding one of the shelves. The product defrost lights are configured to emit radiative heating for defrosting the product. The controller is operably coupled with the cooling system, the cooling coil defrost system, and the product defrost lights.

A refrigerated display case includes sidewalls, doors, shelves, a cooling system, a cooling coil defrost system, product defrost lights, and a controller. The sidewalls and doors may define an inner volume of the refrigerated display case. The shelves are positioned within the inner volume of the refrigerated display case, are fixedly coupled with at least one of the sidewalls, and are configured to support a product. The cooling system provides cooling to the inner volume of the refrigerated display case and may include a cooling coil. The cooling coil defrost system provides defrost heating to the cooling coil. Each of the product defrost lights are oriented towards a corresponding one of the shelves. The product defrost lights are configured to emit radiative heating for defrosting the product. The controller is operably coupled with the cooling system, the cooling coil defrost system, and the product defrost lights.

A refrigerator includes a cabinet configured to form a first storage chamber and a second storage chamber, a first evaporator configured to cool the first storage chamber, a first fan configured to circulate air in the first storage chamber to the first evaporator and the first storage chamber, a second evaporator configured to cool the second storage chamber, a compressor configured to be connected to the first evaporator and the second evaporator, a second fan configured to circulate air in the second storage chamber to the second evaporator and the second storage chamber; a refrigerant valve configured to guide refrigerant to the first evaporator or the second evaporator, and a controller configured to perform a plurality of modes sequentially to defrost the second evaporator.

A cooling or heating device for cooling and/or heating fluids includes a housing and a plurality of cooling plates. The cooling plates are arranged inside the housing, and the cooling plates each comprise at least one cooling channel for guiding a cooling or heating medium through the cooling plates. A container support surface is provided for arranging at least one first container containing a fluid to be heated or cooled inside the housing, and there is a first air blower in the housing for blowing air onto the cooling plates and/or into spaces between the cooling plates.

A method of defrost operation optimization in a heat pump includes launching a heating mode after completion of a performed defrost operation, measuring, after launching the heating mode, a heat transfer capability, determining if the measured heat transfer capability is less than or equal to a predetermined heat transfer capability limit for a non-iced condition, and reinforcing a next defrost operation if the measured heat transfer capability is greater than the predetermined gap limit.

A method of defrost operation optimization in a heat pump includes launching a heating mode after completion of a performed defrost operation, measuring, after launching the heating mode, a heat transfer capability, determining if the measured heat transfer capability is less than or equal to a predetermined heat transfer capability limit for a non-iced condition, and reinforcing a next defrost operation if the measured heat transfer capability is greater than the predetermined gap limit.

A refrigerating and air-conditioning apparatus performs, even during a heating operation under air conditions leading to formation of frost, a defrosting operation while simultaneously continuing the heating operation and improves comfort through heating by securing an appropriate amount of ventilation. A plurality of refrigeration cycles independently performs a heating operation and a defrosting operation. By controlling a ventilation damper of an indoor unit that is to perform a defrosting operation to increase the amount of ventilation, a prior ventilation operation for securing the time-averaged required amount of ventilation including the period in which the defrosting operation is being performed is performed before the defrosting operation, and after the prior ventilation is terminated, the defrosting operation is started.

A refrigerating and air-conditioning apparatus performs, even during a heating operation under air conditions leading to formation of frost, a defrosting operation while simultaneously continuing the heating operation and improves comfort through heating by securing an appropriate amount of ventilation. A plurality of refrigeration cycles independently performs a heating operation and a defrosting operation. By controlling a ventilation damper of an indoor unit that is to perform a defrosting operation to increase the amount of ventilation, a prior ventilation operation for securing the time-averaged required amount of ventilation including the period in which the defrosting operation is being performed is performed before the defrosting operation, and after the prior ventilation is terminated, the defrosting operation is started.

A no-frost refrigeration device includes a forced-air evaporator in an evaporator compartment. At least a first component of the evaporator separates an upstream sector and a downstream sector of the evaporator compartment from one another. One of the two sectors of the evaporator compartment contains an accumulation zone that is fluidically parallel and adjacent to a second component of the evaporator and is cooled by the second component of the evaporator.

A refrigerating and air-conditioning apparatus performs, even during a heating operation under air conditions leading to formation of frost, a defrosting operation while simultaneously continuing a heating operation and that improves comfort through heating by ensuring an appropriate amount of ventilation. A plurality of refrigeration cycles that are capable of independently performing a heating operation and a defrosting operation, are provided. A ventilation damper of an indoor unit in which a refrigeration cycle that performs a defrosting operation is installed is closed during a defrosting operation, and a ventilation damper of an indoor unit in which a refrigeration cycle that performs a heating operation is installed is controlled to achieve a required amount of ventilation corresponding to the indoor ventilation state.