Abstract:
By way of the present invention, the heating effect of the refrigerant migration that takes place in an on /off operating cooling system is reduced, and the refilling of the evaporator (5) with the refrigerant at the start of the next compressor (2) on period is improved.
Abstract:
Die Erfindung betrifft ein Verfahren zum Betreiben einer Kältemaschine, insbesondere einer Wärmepumpe, die einen ein Kältemittel aufweisenden geschlossenen Kreislauf umfasst, in dem nacheinander ein Verdampfer (12) , ein Verdichter (14) , ein Verflüssiger (16) und ein elektronisch gesteuertes Expansionsventil (18) angeordnet sind, bei welchem Verfahren der Verdichter abwechselnd zwischen einem Verdichtungszustand, in dem das Kältemittel verdichtet wird, und einem Leerlauf zustand umgeschaltet wird, in dem das Kältemittel nicht verdichtet wird. Die Erfindung betrifft auch eine entsprechende Kältemaschine.
Abstract:
A method for controlling a refrigeration system comprising a variable compressor capacity, and at least two refrigeration entities 4, e.g. display cases. Suction pressure is controlled by means of permitting/preventing a flow of refrigerant into evaporator of one or more refrigeration entities 4. Compressor capacity is controlled to match a desired capacity level and based on a signal derived from one or more properties of the one or more refrigeration entities 4, said signal reflecting a possible difference between the current compressor capacity and a current refrigeration demand of the refrigeration system. Reduces wear on compressors because switching them ON/OFF is avoided to the largest extent possible. Prevents problems relating to conflicting control strategies due to control parameters, e.g. suction pressure, being controlled by means of two or more controllable parts, e.g. compressors and flow of refrigerant into refrigeration entities.
Abstract:
A method for controlling load capacity in an air conditioning unit comprising the steps of initializing a saturated condensing temperature upper bound (SCT_UP), comparing a saturated condensing temperature (SCT) to a maximum condensing temperature threshold (MCT_TH), unloading a single load capacity step, allowing the air conditioning unit to stabilize, and setting the SCT_UP equal to the SCT after the unloading, and increasing the load capacity by one capacity step if increased load capacity is required, the SCT is less than or equal to the MCT_TH, and the SCT
Abstract:
A method and device for controlling the inside temperature of a refrigeration compartment, the device including a thermostat, a temperature sensor connected to the thermostat, and control means for controlling refrigerating means of the refrigeration compartment; wherein the control means are controlled by the thermostat; the temperature sensor is located far away from the refrigerating means and in a specific portion of the inside volume of the refrigeration compartment, e.g. on a lighting fixture for lighting the inside of the refrigeration compartment and which also supports the thermostat and the control means; and the specific portion of the inside volume of the refrigeration compartment is selected with the exclusion of a first top portion of the volume of the refrigeration compartment having a volume equal to 8-10% of the total inside volume of the refrigeration compartment, with the exclusion of a second front portion of a depth equal to at least 10% of the total inside depth of the refrigeration compartment, and preferably also with the exclusion of a bottom portion of the refrigeration compartment.
Abstract:
Heater (7) inside the freshfood compartment (2) is operated partially during the quick-freeze process, ensuring that the electric consumption cost of the user is reduced and also, that the foods inside the freshfood compartment (2) do not spoil as a consequence of overheating.
Abstract:
A control system is provided for generating discrete stepped output capacities in a refrigeration system (100). The refrigeration system (100) is preferably a multi-evaporator system having two or more multi-capacity compressors (102, 104). The multi-capacity compressors (102, 104) can be any kind of reciprocating compressor or scroll compressor that can provide two or more different output capacities. The contributions of the compressors (102, 104) to the overall system capacity can be equal, or more preferably, they can be unequal, i.e., one compressor provides more capacity than the other compressor(s). The control system generates the stepped capacities of the refrigeration system (100) by configuring and controlling the operation of the compressors (102, 104) and the output capacity provided by the compressors (102, 104).
Abstract:
A cooling system (10) including an evaporator (28), a suction line (74), a two stage compressor (20), a gas cooler (24) and a capillary tube (60). The suction line receives gaseous or two phase refrigerant from the evaporator, the compressor receives the gaseous or two phase refrigerant from the suction line, and the gas cooler cools compressed refrigerant discharged from the compressor. The capillary tube carries refrigerant from the gas cooler to the evaporator, and the suction line may include two straight portions with two portions of the capillary tube helically wound there around, with a bypass valve (24) around the capillary tube, and an accumulator between the suction line portions. An inter-cooler (38) is between stages of the compressor, and a pan collects water condensate from the air side of the evaporator, and the refrigerant tube carries cooled refrigerant from the gas cooler through the pan. A controller (92) selectively turns the compressor on and off based on temperature or pressure sensed by a sensor (94).
Abstract:
A refrigerator that efficiently cools multiple cold spaces at different temperatures with one compressor and one condenser is disclosed. Multiple, fan equipped evaporators (EVAP1, EVAP2, EVAP3) are in series, and an expansion valve (EV) regulates superheat from inlet to outlet of the series evaporators (EVAP1, EVAP2, EVAP3). Cold space temperatures (T1, T2, T3) are regulated with an on-off thermostat in each space. If only one fan (F1, F2, F3) is turned on, system performance approaches that of a single evaporator refrigerator with controlled superheat. More than one evaporator fan (F1, F2, F3) may be turned on for initial cooldown.
Abstract:
In the cooling system of a two-door type refrigerator with freezer (2) and fresh food compartments (1), the total running time (tquick) of the Quick Freeze is equal to the sum of the quick freeze 100% running time (t100) and the quick freeze cyclic running times (tcycle). The duration and temperature values at which the compressor (7) has to be operated for the quick freeze process and the operational period of the heater (5) placed in the fresh food compartment (1) to avoid the decrease of the inner temperature of the fresh food compartment (1) during quick freezing, as well as the temperature value at which the heater has to be operated are determined in the control unit (8).