Abstract:
The invention concerns a temperature control device (10) comprising a heat pump (12) including a main refrigerant circuit (14) drawing calories from a cold source (16) to transfer them to a hot source (18), the cold source (16) including a refrigerant/air heat exchanger (26), called first evaporator. The cold source (16) also comprises a refrigerant/coolant heat exchanger (20), called second evaporator (28), thermally communicating the main refrigerant circuit (14) with a secondary coolant circuit (38) capable of being connected to at least a first secondary heat-exchanger circuit (42, 44) in heat exchanging relationship with a first source of calories of the vehicle. The first (26) and second (28) evaporators are connected in parallel.
Abstract:
The object of this invention is to provide an air conditioner with a variable capacity compressor (2) parallely connected to a fixed capacity compressor (4), and a method of controlling the operation of such an air conditioner. When it is required to start the fixed capacity compressor (4) in addition to an operation of the variable capacity compressor (2) due to an increase in the sum of the required cooling capacities of indoor units (9), an outdoor control unit (13) starts the fixed capacity compressor (4)during an unloading mode operation of the variable capacity compressor (2) where the pressure difference between the outlet side and inlet side of the variable capacity compressor is minimized. The fixed capacity compressor (4) is thus smoothly started without causing an induction of excessive starting current, and improves the operational reliability of the air conditioner.
Abstract:
A high capacity, continuous production blast freezer includes an insulated enclosure and a plurality of adjustable product-carrying trolleys, individually moveable with the enclosure from an entrance location to an exit location. A heat exchanger in the form of an evaporator is provided in the enclosure. The mechanical equipment for the refrigeration system can be placed within the enclosure and separated from the freezing cell by a bulkhead. In one embodiment the enclosure is in the form of a container adapted to be transportable by ship, rail or truck. The arrangement of the heat exchanger or evaporator relative to the product carrying devices and the enclosure is designed to maximize the capacity of the heat exchanger and minimize frost formation, while providing for a maximum amount of product space within the enclosure to maximize throughput of the system.
Abstract:
The separate regulation of the refrigerator compartment (13) and the freezer compartment (17), in fridge-freezer combinations with a single compressor (29), is known per se, whereby the refrigerator evaporator (14) and the freezer evaporator (18) are in a parallel circuit, with each other and may be controlled by a solenoid valve (31). In the above system of regulation of a fridge-freezer combination (10), however, the problem would occur, where, during the idle phase of the compressor (29), a portion of the fluid refrigerant would remain in the freezer evaporator (18) and, should the demand for chilling the refrigerator compartment (13) arise, only a reduced refrigerant amount was then available. The aim of the invention is to avoid this problem and said aim is achieved by designing the retained volume of the refrigerant line section (22) in the freezer evaporator (18), which serves to collect the fluid refrigerant (23), such that a complete filling with fluid refrigerant is achieved during the idle time of the compressor (29). The fluid refrigerant (23) is, thus, directly available for the refrigerant circuit of the refrigerator compartment (13), when there is a demand for chilling the refrigerator compartment (13).
Abstract:
A multi-stage compression refrigerating device, comprising low stage compression means (32) and high stage compression means (34), a condenser (1), first decompression means (3), an intermediate cooler (6), second decompression means (7), and an evaporator (8), wherein refrigerant delivered from the condenser (1) is divided so as to feed one refrigerant from the first decompression means (3) to the intermediate cooler (6) and the other refrigerant from the second decompression means (7) to the evaporator (8), refrigerant flowing into the second decompression means (7) is heat-exchanged with the intermediate cooler (6), refrigerant delivered from the evaporator (8) is sucked into low stage compression means (32), and refrigerant delivered from the intermediate cooler (6) is sucked into high stage compression means (34) together with refrigerant delivered from low stage compression means (32), a second intermediate cooler (5) being provided between the evaporator (8) and the low stage compression means (32), the other refrigerant heat-exchanged with the second intermediate cooler (5) being heat-exchanged with the intermediate cooler (6), whereby the delivery gas refrigerant temperature of the high stage compression means can be suppressed, and refrigerating effects of the refrigerating device at the beginning of starting can be increased to improve the efficiency.
Abstract:
A softserve product refrigeration and dispensing machine (3) having numerous novel features, including a special subcooler (30) to make the machine more efficient by application of a passive cooling system, allowing for pre-product mix cooling in a softserve product dispensing machine (80).
Abstract:
The invention relates to a method for producing an electromagnetic valve, especially one designed for circulating a coolant, whereby great tightness can be achieved in a simple manner. According to the invention, this is accomplished by soldering a joining pipe (13) to the valve housing (2) on the periphery side and to a pole shoe (3) mounted on the valve housing (2) on the face side.
Abstract:
The invention is embodied in a refrigeration unit (R) adapted for use in combination with plural associated refrigerated fixtures (33a, 33b, 33c) in a commercial store, each fixture having a product zone and heat transfer cooling means (29) for the refrigeration thereof and which refrigeration unit comprises housing means (55, 57) with a mounting profile constructed to be accommodated substantially within the footprint area of one of said associated fixtures and arranged to support selective refrigeration components of a closed refrigeration circuit for supplying the refrigeration requirements of all associated fixtures, and which components include plural vapor phase compressor means (21) and a closely coupled coolant loop connected with the heat transfer cooling means.
Abstract:
A double-tube type heat exchanger (1) capable of forming a compact and inexpensive gas injection circuit and an over-cooling circuit, wherein a restriction hole (6) through which refrigerant led into an outer tube (3) is led into an inner tube (2) while expanding is formed in the inner tube (2), whereby a part of the refrigerant led into the outer tube (3) can be led into the inner tube (2), while expanding, through the restriction hole (6) formed in the inner tube (2), i.e., the restriction hole (6) formed in the inner tube (2) plays a role as an expansion mechanism of a bypass flow.
Abstract:
The invention comprises a merchandiser having a refrigerated product area with a plurality of product zones and separate air flow circulation means for the respective product zones, laterally adjacent modular cooling coils associated with the respective air flow circulation means and having a normal air flow cooling mode, and defrosting means constructed and arranged for selectively discontinuing the normal cooling mode of one modular cooling coil to effect a defrosting mode thereof during a period of continued normal cooling mode operation of another of said modular cooling coils, and thereafter defrosting another modular cooling means after re-establishing normal air flow cooling of said one modular cooling coil. The invention further comprises the method of defrosting separate modular cooling coils on staggered defrost cycles to maintain at least partial cooling air flow to the merchandiser product area at all times.