US2167442A - Refrigeration apparatus - Google Patents

Description

July 25, 1939. c. F. ALSING REFRIGERATION APPARATUS 2 Sheets-Sheet 1 Original Filed June 18 '4! WITNESSES: ll pa.

INVENTOR CARL F. RLsme,

ATTO

FIQJ

July 25, 1939. cfF. ALS ING 2,167,

\ REFRIGERATION APPARATUS Original Filed June 18, 1936 2 Sheets-Sheet 2 INVENTOR CARI. F. ALs/Nci.

Fla. 4. I ATTO WITNESSES;

Patented July 25, 1939 REFRIGERATION APPARATUS Carl F. Alsing, Springfield, Mass., assignor to Westinghouse Electric & Manufacturing Company, East Pittsburgh, Pa., a corporation of I Pennsylvania Application June 18, 1936, Serial No. 85,856 Benewed'June 29, 1938 15 Claims. (Cl. 62-115) My invention relates to refrigeration apparatus and particularly to refrigeration apparatus used generally for domestic purposes.

It is an object of my invention to provide re- 5 -frigeration apparatus in which the moisture condensed in the cabinet is evaporated by heat dissipated from the apparatus and is carried from the cabinet with air passing through the machinery compartment.

It is another object of my invention to utilize the evaporation of moisture condensate from the refrigerator to assist in dissipating the heat from.

operation of the refrigeration apparatus.

It is still another object of my invention to provide an improved cooling system for heat generating portions of refrigeration apparatus by the use of a secondary refrigerant cooling circuit in conjunction with an arrangement utilizing the heat of vaporization of a tertiary fluid, such as,

for example, the moisture condensate from the cooling element of the refrigeratingapparatus.

It is a further object of my invention to provide adequate cooling of the heat generating parts of the refrigerating apparatus.

It is still a further object of my invention to I totally enclose the operating parts of a refrigeration machine, with sound insulation if desired,

and at the same time provide adequate cooling for said machine.

It is yet another object of my invention to provide an improved arrangement for moisture condensate removal from the refrigerated portions of a refrigerator, and more specifically to provide suchan arrangement in a refrigerator of the two-temperature type.

These and other objects are eflected'by my invention as will be seenfrom the following description and claims taken in connection with the accompanying drawings forming a part of this application, in which:

Fig. l is a vertical sectional view of a two temperature refrigerator embodying my invention;

Fig. 2 is ,a plan view of the 'motor compressor unit and cooling apparatus illustrated in Fig. 1 showing specifically the hot plate and the refrigerant passages associated therewith which transmit heat to the hot plate;

Fig. 3 is an end view of the motor compressor unit and the secondary refrigerant cooling system preferably utilized in practicing my invention; and,

Fig. 4 is a diagrammatic view of the refrigerating system preferably used in practicing my invention.

Referring specifically to the drawings for a v This specific arrangement detailed description of my invention, the cabinet l comprises a food compartment I2 and a machinery compartment l4 disposed below the food compartment. The food compartment l2 includes a food liner l6 which is divided by a horizontal insulated partition l8 into a lower relatively colder or freezing compartment 2lland an upper warmer food storage compartment 22.

is described and claimed in the application of Milton Kalischer, 10 Serial No. 751,324, filed November 3, 1934, and assigned to the Westinghouse Electric 8: Manufacturing Company.

The machinery compartment V I4 is divided into circulation of air through the compartment, and a compartment 26 containing a motor compressor unit 23.

As shown in Figs. 1 and 4, the evaporator 28 refrigerates the colder compartment and the 20 evaporator 30 refrigerates the warmer compartment 22. The evaporator 28 is made up-of a plurality of tubes 32 connected at their ends by a header 34 and secured to the under surface of the bottom wall portion of the food liner I6. The warmer evaporator 38 comprises a serpentine coil secured to the back surface of the rear wall portion of the food liner l6 adjacent to the warmer compartment 22. The outlet 36 of the warmer evaporator is connected through a 30 conduit 38 to the inlet 40 of the compressor 42 which is enclosed together with its driving motor 44 by a hermetically sealed casing 46. The outlet 48 of the compressor 42 communicates with the plate condenser 58 through a conduit '52. The plate condenser 58, which preferably is of sheet metal constructiomis attached to the back .wall of the cabinet ill by any suitable means and is disposed within a flue 54 formed by an enclosure 56 in cooperation with the rear wall of the cabinet.

As shown in Fig. 4, the plate condenser 50 is connected by a conduit 58 to a float valve structure 60 which is fully described and claimed in the application of Leslie B. M. Buchanan, Serial No. 15,003, filed April 6, 1935, and assigned to the assignee of the present invention.

In the present embodiment, the float valve structure 60 serves as a reservoir for part of the refrigerant charge in the refrigerating system during the period that the colder evaporator 28 is being refrigerated. As shown in Fig. 4, the float valve structure 60 comprises a chamber 62,

a needle valve 64 therein which controls the fiow of refrigerant to the evaporators 28 and 30, and a liquid refrigerant float member 66. The float member 86 comprises -upperv and lower float members 66a and 68b which are fixed in a vertical spaced relationship by a stem 68; A weight I6 is also provided within the chamber 62 and is adapted to either rest on the float member 68 or to be lifted by a solenoid A ,conduit I4, which is shown broken in Fig. l, connects the chamber 62 through the needle valve 64 with the connecting chamber I6. The connecting chamber I6 connects the warmer evaporator 36 and the colder evaporator 28 with each other and is disposed at a level higher than the header 34 of the colder evaporator 28. The connections of the primary refrigerant circuit,

and the float valve structure 60 are not shown tem. The control system comprises the line conductors L--I and L-2, the former being connected to one terminal of the motor 44. The thermostat 80, which is actuated by the temperature of the warmer compartment 22, has one contact connected to the line conductor L2 and the other contact connected to one terminal of the solenoid12 through a conductor 82. The other terminal of the solenoid I2 is connected through a conductor 84 to the conductor 86 and the other terminal of the motor 44.

A thermostat I8, which is actuated by the temperature of the colder compartment 26, is connected between the conductor L-2 and the con-.

ductor 86. Each thermostat is adjustable to provide a desired temperature within the respective compartments and may be of any desired type known in the art.

In the operation of the refrigerating system of the apparatus embodying my invention, assume that the warmer compartment 22 requires refrigeration while the colder compartment 26 is sufiiciently cold. Under this condition, the contacts of the thermostat 80 will be closed and those of thethermostat I8 will be open. An electrical circuit will be set up which will cause the solenoid I2 and the motor 44 driving the compressor 42 to be energized. The energized solenoid I2 lifts the weight I6 from the float 66, which, being relieved of the weight I0, maintains a lower liquid level in the chamber 62. The refrigerating system is charged with a sufflcient quantity of refrigerant, so that, under this condition there is sumcient liquid refrigerant conveyed through the conduit I4 to the connecting chamber I6 to flrst completely flll the cold evaporator 28 and then to supply sufllcient refrigerant to the warm evaporator 30 for the operation thereof.

The refrigerating system now operates in the desired manner of such apparatus to effect refrigeration of the warmer compartment 22. The in the evaporator 30 is vaporized therein and is withdrawn from the evaporator 36 through the' conduit 38 by the compressor 42 wherein its pressure is increased. It is then condensed in the condenser 50 and returned to the float chamber 62, through the conduit 58. Thecirculation of the refrigerant continues until such time as the temperature of the warm compartment has been reduced to the lower limit for which the thermostat 80 has been set.

Assuming now that the colder compartment 20 is calling for refrigeration, the contacts of the thermostat I8 will be closed and an electrical circuit will be set up from the conductor L2 through the thermostat I8, through the motor 44 to the conductor L! to effect operation of,

the motor 44. The solenoid I2 will be, deenergized regardless of whether the contacts of the thermostat I8 are open or closed, for if they are closed, the solenoid is shunted by the thermostat 80. With this condition existing the weight I0 rests on the float member 66 causing the liquid level in the float chamber 82 to rise to a higher level within the chamber before the float member 66 will rise to open the valve 64. Due to the high liquid level that must be maintained to float the float member 66, part of the refrigerant charge in the refrigerating system is retained in the float chamber 62 with the result that only the cold evaporator 28 will be supplied with liquid refrigerant. The liquid refrigerant remaining in the warm evaporator 36 from the previous operation is first evaporated while condensed refrigerant is retained in the float chamber 62 until the upper liquid level is reached. Further operation of the compressor reduces. the suction pressure until evaporation in the evaporator 28 takes place.

The refrigerating system now operates in the usual manner, the refrigerant supplied to the connecting chamber I6 flows into the header 84 to .supply the colder evaporator 28. The refrigerant vaporized in the evaporator 28 passes through the evaporator 30 and being at a lower temperature extracts some heat therefrom before passing through the conduit 38 to the compressor 44 wherein its pressure is increased. It is then condensed in the condenser 50 and returned to the float valve chamber 62. When the temperature in the coldercompartment 20 is reduced to the lower limit for which the thermostat I8 is set, the latter will open its contacts. If the contacts of the thermostat 88 are open, the operation of the refrigerating system ceases, but if they are closed, the solenoid 'I2is energized and the motor compressor unit will continue to operate to effect refrigeration of'the warmer compartment 22 in the manner first described.

A more detailed description of the operation of the refrigeration apparatus maybe found in the application of Leslie B. M. Buchanan, Serial No. 15,003, flied April 6, 1935, and assigned to the Westinghouse Electric 8: Manufacturing Company.

In the refrigerating apparatus embodying my invention the motor compressor unit 23 is resiliently mounted within the compartment 26 so as to minimize the transmission of the vibrations set up by the motor-compressor unit 23 to the cabinet. The upright walls of the compartment 26 are covered with a sound-absorbing material 88, to provide a noise shield which reduces to a minimum the noise emanating from the compartment 26.

When the motor compressor unit 23 is enclosed to reduce the noise therefrom, and when sound insulation is utilized, the problem of heat dissipation from the apparatus becomes acute and cooling means must be provided to maintain the operating temperature at a safe value. The problem of removing moisture condensed out of the air within the cabinet is also present.

ing the motor and compressor.

In the apparatus embodying my invention some of the heat generated by the working parts is utilized to evaporate the condensed moisture,

Thus, heat from the working parts .of the apparatus is dissipated to the condensed moisture to secondary cooling refrigerant, surrounds a portion of the hermetically sealed casing 46 enclos- The jacket 90 communicates with the inlet end of a conduit 92 attached by soldering or other suitable means ,to a flat plate 94, through a conduit 96, and with a secondary refrigerant condenser 98 through a to collect the moisture condensed therein. In the conduit I00. A conduit I02 completes the secondary refrigerant circuit and provides refrigerant conveying means between the outlet endof the refrigerant conduit 92 and the secondary refrigerant condenser 98. The secondary refrigerant condenser 98 is preferably a single pass type with extended heat radiating surfaces 18, and is located in the flue 54, below the plate condenser 50 at the rear, of the cabinet Ill, as shown in Fig.

1. It will be obvious tothose skilled in the'art,

that both the plate 94 and the secondary refrigerant condenser 98 may assume various forms without departing from the spirit of my invention.

In the warmer compartment 22, a trough I i2 is formed in the horizontal insulated partition I8 colder compartment 20, a trough I I4 is formed in the bottom wall portion of the food liner I6 to collect moisture from the colder compartment 26' when it is defrosted.

H4 is conveyed by conduits H6 and H8 respectively to a pan III), which is disposed in the com--. partment 24 in heat exchange relation with plate 94 and which is of ample capacity to take care of all the moisture that may collect in the compartments 20 and 22 under ordinary conditions of operation or during defrosting of the'colder compartment 20. i

.The heat generated by the working parts of the apparatus causes the secondary cooling refrigerant contained in the jacket to vaporize. The vaporized refrigerant-passes from the liacket 90 through the conduit 95,-to the refrigerantconduit 92 attached to the plate 94. The plate 94 is heated by the vaporized secondary refrigerant in the conduit 92 and also by heat radiated from the motor-compressor unit 23. Moisture in the pan H0, which is in heat exchange relation with the plate 94 is therefore caused to evaporate, and

abstract heat from the secondary refrigerant in] the conduit 92 through the medium of the plate 94. The condensed moisture may, therefore, be termed a tertiary cooling fluid for the motor compressor unit 23, since it cools the secondary refrig'erant in the conduit 32 and also absorbsthe radiated heat fromthe motor compressor unit 23.

of the cabinet l0 opens into the flue 54 and provides an'outlet for the air entering the compartwithsaid motor compressor unit, a secondary ment 24 through the openings I20.

The air entering the'com-partment 24 at the openings I20 passes over the pan III! and carries alongwith it the moisture evaporated from the .pan I III by the heat generated by the working parts of the refrigerating system. The moisture laden air enters the flue 54 through the opening I22 and due to the convection currents induced by the plate like construction of the primary condenser 59, the air from the compartment 24 is carried upward in the flue 54 to-coolthe secondary refrigerant condenser 98 and the primary refrigerant condenser 59. The cooling air which enters the flue 54 at I 24 is discharged together with the air from the compartment 24 at I25.

The air entering the compartment 24 is at room temperature and has its dry bulb temperature increased by' absorbing some of the heat radiated by the motor-compressor unit 23. The relative humidity of the air is, therefore, decreased and its heat absorbing capacity increased. As the air passes over the water in the pan 0 it absorbs considerable moisture and sensible heat of the air is decreased by giving up heat required to evaporate the moisture absorbed. The sensible heat or the dry bulb temperature of the air is therefore decreased and, since this air enters the flue 54 and passes over both condensers the condensers operate at a lower temperature than the room air temperature. The capacity of the condensers and the efficiency thereof is therefore increased because of the lower temperature of the cooling medium.

It will be apparent from the foregoing thatmy invention provides'refrigerating apparatus which has an improved cooling system for the heat generating portions of the apparatus and in which the problems of removing the moisture condensed in the cabinet and of dissipating the heat generated by the working parts of the apparatus are used to offset each other by evaporating the condensed moisture with heat dissipated fromous changes and modifications without departing from the spirit thereof, and I desire, therefore,

that only such limitations shall be placed thereupon as are imposed by the prior art or as are speciflcally'set forth in the appended claims; What I claim is:

1. In refrigerating apparatus. the combinationof means for circulating a primary refrigerant and embodying elements from which heat is to be removed,a circulatory system for a secondary refrigerant including cooling means disposed in heat exchange relation with said elements, a secondary refrigerant condenser communicating with said cooling means; a refrigerant container in series w th said cooling means and said con-' denser, and a tertiary cooling fluid disposed in heat exchange relat on with said container, said secondary refrigerant being vaporized in said cooling means to abstract heat from said elements. then cooled in said container by the tertiv ary cooling fluidand finally liquefied in said concondensed moisture to said receptacle,

condenser communicating with said cooling means, a refrigerant conducting coil series with said cooling means and said secondary condenser, and a tertiary fluid in heat exchange relation with said coil, said secondary refrigerant being vaporized in said cooling means to abstract heat from said motor compressor unit and then cooled in said coil by the tertiary fluid and liquefied in said condenser.

3. In refrigerating apparatus, the combination of means for circulating a primary refrigerant including a motor compressor unit and an evaporator, a circulatory system for a secondary refrigerant including cooling means disposed in heat exchange relation with said motor compressor unit, a secondary condenser communi- .cating with said cooling means, a refrigerant conducting coil in series with said cooling means, a collecting means for receiving condensate from said evaporator and disposed in heat exchange relation with said coil, said secondary refrigerant being vaporized in said cooling means to abstract heat from the motor compressor unit and then cooled in said coil by the condensate in said collecting means and liquefied in said condenser.

4. In refrigerating apparatus, the combination of means for circulating a primary refrigerant including a motor compressor unit and an evaporator, a circulatory system for a secondary refrigerant including cooling means disposed in heat exchange relation with said motor-compressor unit, a secondary refrigerant condenser communicating with said cooling means, a refrigerant conducting coil in series with said cool- "ng means and said secondary condenser, a plate disposed above said motor compressor unit in heat exchange relation with said coil, collecting means for receiving condensate from said evaporator disposed in heat exchange relation with said plate, said secondary refrigerant being vaporized in said cooling means to abstract'heat from said motor compressor unit and then cooled in said coil by the condensate in said collecting means and liquefied in said condenser.

5. A refrigerating apparatus comprising a cabinet embodying a food compartment and a machinery compartment disposed below said food compartment, a refrigerating system associated with said cabinet including heat generating elements mounted in said machinery compartment, an evaporator in thermal exchange with said food (compartment, a circulatory system for a secondary refrigerant including cooling means disposed in heat exchange relation with said heat generating elements, a secondary condenser connected to said cooling means, a container for secondary re-,

frigerant communicating with said cooling means and said secondary condenser, a plate arranged in heat exchange relation with said container, means in'said food compartment to collect moisture condensed therein, a receptacle for said condensed moisture disposed in heat exchange rela tion with said plate, means for conveying said said secondary refrigerant being effective to absorb heat by vaporization in said cooling means and being cooled and liquefied by passage through said container and said secondary condenser, said cooled and liquefied secondary refrigerant being then returned to said cooling means for again absorbing heat from said heat generating elements. f

6. A refrigerating apparatus comprising a cabinet embodying a food compartment and a machinery compartment disposed below said food compartment, a refrigerating system associated with said cabinet including heat generating elements mounted in said machinery compartment, an evaporator in thermal exchange with said food compartment, a circulatory system for a secondary refrigerant including cooling means disposed ln heat exchange relation with said heat generating elements, a secondary condenser connected to said cooling means, a container for secondary refrigerant communicating with said cooling means and. said secondary condenser, collecting means in said food compartment to receive moisture condensed therein, a receptacle for said condensed moisture disposed in heat ex-- change relation with said secondary refrigerant container, means for conveying said condensed moisture to said receptacle, said secondary refrigerant being effective to absorb heat by vaporization in saidcooling means, said moisture being evaporated by heat dissipated from said vaporized refrigerant in said container and by heat radiated from said heat generating elements to said collecting means said secondary refrigerant being cooled and liquefied by passage through said container and said secondary condenser, said cooled and liquefied secondary refrigerant being -returned to said cooling means to again absorb heat from said heat generating elements.

7. A refrigerating apparatus comprising a cabinet embodying a food compartment and a machinery compartment disposed below said. food compartment, a refrigerating system associated with said cabinet including heat generating elements mounted in said machinery compartment, an evaporator in thermal exchange with said food compartment, a circulatory system for a secondary refrigerant including cooling means disposed in heat exchange relation with said heat generating elements, a secondary condenser connected to said cooling means, a container for secondary refrigerant communicating with said cooling means and the secondary condenser, collecting means in said food compartment to receive moisture condensed therein, a receptacle for said condensed moisture disposed in heat exchange relation with said secondary refrigerant container, means for conveying said condensed moisture to said receptacle, said secondary refrigerant being effective to absorb heat by vaporization in said. cooling means, said moisture being evaporated by heat dissipated from said vaporized refrigerant in said container, means for directing air through the machinery compartment to convey said evaporated moisture externally thereof, said secondary refrigerant being cooled and liquefied by passage through said container and said secondary condenser, said cooled and liquefied secondary refrigerant being returned to said cooling means to again absorb heat from said heat generating elements.

8. A refrigerating apparatus comprising a cabinet embodying upper and lower food compartments and a machinery compartment disposed below said food compartments, a refrigerating system associated with said cabinet including heat generating elements mounted in said machinery compartment, evaporators in thermal exchange with respective food compartments, one of said evaporators being maintained at a lower temperature than the other with said lower food compartment, a circulatory system for a secondary refrigerant including cooling means disposed in heat exchange relation with said heat generating elements, a secondary condenser connected to said cooling means, a container for secondary refrigerant communicating with said cooling means and with said secondary condenser, collecting means in said upper food compartment and in said lower food compartment to receive moisture condensed therein, a receiver for said condensed moisture disposed in heat exchange relation with said secondary refrigerant container, means for. conveying said condensed moisture to said condensate receiver, said secondary refrigerant being effective to absorb heat by vaporization in said cooling means, said moisture being evaporated by heat dissipated from said secondary refrigerant containensaid secondary refrigerant being cooled and liquefied by passage through said container and said condenser, said cooled and liquefied secondary refrigerant being returnedto said cooling means to again absorb heat from said heat generating elements.

9. A refrigerating apparatus comprising a cabinet embodying a food compartment and a machinery compartment disposed below said food compartment, a refrigerating system associated with said cabinet including compression means mounted in said machinery compartment and an evaporator in thermal exchange with said food compartment, an air flue associated with the cabinet, heat absorbing means containing a secondary vaporizable refrigerant disposed in heat exchange relation with said compression means, a secondary refrigerant container connected to said heat absorbing means, collecting means for condensed moisture in said food compartment, a receiver for said moisture in heat exchange relation with saidsecondary refrigerant container, and means conveying said moisture from said food compartment to said receiver whereby heat absorbed by said secondary refrigerant from said compression'means is utilized to evaporate said moisture and cool said secondary refrigerant, said flue being in communication with said machinery compartment whereby air containing evaporated moisture is removed from said machinery compartment through saidflue.

10. A refrigerating apparatus comprising a, cabinet embodying a food compartment and a machinery compartment disposed below said food compartment, 2. refrigerating system associated with said cabinet comprising a motor compressor unit mounted'in said machinery compartment, a casing enclosing said motor compressor unit, a jacket surrounding said enclosed motor compressorunit and in heat exchange relation therewith, an evaporator in thermal exchange with said food compartment, an air flue associated with said cabinet, a secondary refrigerant condenser connected to said jacket, a secondary refrigerant 0011- connected to said secondary condenser and said jacket, means in said food compartment to collect the moisture condensed therein, a container for said moisture disposed in heat exchange relation with said coil, means conveying said moisture from said compartment to said container whereby heat absorbed by said secondary refrigerant from said motor compressor unit is transmitted by said coil to said container to evaporate said moisture and cool said'secondary refrigerant, said flue being in communication with said machinery compartment, whereby air containing evaporated moisture from said container is removed from said machinery compartment through said flue, said secondary condenser being cooled by air passing through said flue. i

11. A refrigerating apparatus comprising a cabinet embodying a food compartment and a machinery compartment disposed below said food compartment, a refrigerating system associated with said cabinet, comprising a motor compressor unit, a casing enclosing said motor compressor unit, a jacket surrounding said casing and in heat exchange relation therewith, an evaporator in thermal exchange with said food compartment, a primary condenser on one of the walls of said cabinet, a flue associated with said cabinet surrounding said primary condenser, a secondary refrigerant condenser disposed in said flue ad- Jacent to said primary condenser, a secondary refrigerant coil connected to said jacket and said secondary condenser, means in said food compartment to collect the moisture condensed therein,

a container for said moisture disposed in heat exchange relation with said coil. and means conveying said moisture from said compartment to said container, whereby heat absorbed by said secondary refrigerant from said motor compressor unit is transmitted by said coil to said container to evaporate said moisture and cool said secondary refrigerant, said flue being in communication with said machinery compartment, whereby air containing evaporated moisture is removed from said machinery compartment and combines with convection air currents induced by said primary condenser to cool both of said condensers.

12. A refrigerating apparatus comprising a cabinet embodying upper and lower food com-- partments, a machinery compartment disposed below said food compartments and means for conveying air through said machinery compart-- ment, a refrigerating system associated with said cabinet comprising a motor compressor unit, a casing enclosing said motor compressor unit, a jacket surrounding said casing and in heat exchange relation therewith, an evaporator in thermal exchange with said upper food compartment, a colder evaporator in thermal exchange with said lower food compartment, 2. primary condenser mounted on one of the walls of said cabinet and forming with the cabinet, an air flue, a secondary refrigerant condenser disposed adjacent'to said primary condensenand subject to the flue action of said primary condenser, said secondary condenser being connected to said jacket, a secondary refrigerant coil connected to said secondary condenser and said jacket, co-llecting means in said food compartments to receive the moisture condensed therein, a container orated moisture is removed through said flue and passes upwardly in said flue with convection air currents induced by'said primary condenser to cool said primary condenser and said secondary condenser.

13. A refrigerating apparatus comprising a cabinet embodying a food compartment and a machinery compartment disposed below said food compartment, an inlet and an outlet for air in the machinery compartment, a refrigerating system associated with said cabinet comprising a motor compressor unit disposed in said machinery compartment, a sound-proof enclosure for said motor compressor unit, a metal casing sealing said motor compressor unit, an evaporator in thermal exchange with said food compartment, an air flue associated with said cabinet, a jacket containing a secondary vaporizable refrigerant surrounding said metal casing and in heat exchange relation therewith, a secondary refrigerant condenser connected to said jacket, a secondary refrigerant coil connected to said secondary condenser and said jacket, means in said food compartment to collect moisture contained therein, a container for said moisture disposed in heat exchange relation with said coil, means conveying said moisture from said compartment to said container, whereby heat absorbed by said secondary refrigerant from said motor compressor is transmitted from said coil to said container to evaporate said moisture into the air in said machinery compartment and to cool said secondary refrigerant,

unit disposed in said sound insulated section of said machinery compartment, a metal casing sealing said motor compressor unit, an evaporator in thermal exchange with said food compartment, an air flue associated with said cabinet, cooling means containing a secondary vaporizable refrigerant disposed in heat exchange relation'with said metal casing, a secondary refrigerant condenser connected to said cooling means, a secondary refrigerant container connected to said cooling means and the secondary refrigerant condenser, means in said food compartment to collect moisture contained therein, a receiver for said moisture disposed in heat exchange relation with said container, means conveying said moisture from said compartment to said receiver, whereby heat absorbed by said secondary refrigerant from said motor compressor unit is transmitted from said container to said receiver to evaporate said moisture into the air in said machinery compartment and to cool said secondary refrigerant, said flue being in communication with said machinery compartment whereby air containing evaporated moisture from said receiver is removed from said machinery compartment through said flue.

15. A refrigerating apparatus comprising a cabinet embodying upper and lower compartments and a machinery compartment disposed below said food compartments, said machinery compartment divided into a noise-proof compartment and a compartment through which air circulates, a refrigerating system associated with said cabinet comprising a motor compressor unit disposed in said noise-proof compartment, a

metal casing sealing said motor compressor unit, an evaporator in heat exchange relation with the upper food compartment, a colder evaporator in thermal exchange with the lower food compartment, an air flue associated with said cabinet, a secondary refrigerant condenser connected to said jacket, a secondary refrigerant coil connected to said jacket and said secondary refrigerant condenser, means in said food compartments to collect moisture condensed therein, a container for said moisturedisposed in heat exchange relation with said coil, and means conveying said moisture from each of said food compartments to said container, whereby heat absorbed by said motor compressor is transmitted from said coil to said container to evaporate said moisture and cool said secondary refrigerant, said flue being in communication with said air circulating compartment of said machinery compartment, whereby air containing evaporated moisture from said container is removed from said'machinery compartment through said flue.

CARL F. ALSING.

Images