Servel Gas Refrigerator $1149.95 - Fully independent refrigerator-freezers; available in LP gas, these high quality refrigerator require no electricity, which is ideal for use in remote cabin or cottage, on the farm or ranch, or for emergency back-up situations. The ammonia absorption cooling system is quiet and dependable, with no compressor or other moving parts to wear out. Choose bisque or white exterior finish with designer bevel edges. The easy-to-clean all-white interior features adjustable, removable shelves and door bins for stocking flexibility, plus two vegetable crispers and a battery powered interior light.
The freezer compartment (1.6 cu. ft.) has a three-position adjustable shelf. Both doors have easy-to-use built-in handles. Handles are different than shown in picture. Covered exterior controls include manual ignition, thermostat and fuel selector. All models can be operated on AC electricity if desired.
The bottom rack of the Servel holds 2-liter bottles; patented "fingers" hold bottles of any size in place, yet allow easy removal. The base-mounted control panel contains the gas/electric selector, temperature control, piezo ignitor and flame safety valve. Just set the desired cooling level; the combined electric and gas thermostat maintains it. The best and most reliable gas refrigerator for sustained temperatures above 90 degrees.
Consul Gas Refrigerator $959.95 Made in Brazil, this refrigerator has a reversible door, which can be opened from the left or right. Other features include an 18-unit egg tray, two removable door compartments for small items and a dry-cell battery powered light that goes on when you open the door. The freezer is smaller than the Servel, but the total capacity is about the same. Dimensions are 57"h x 23.5"w x 27" deep. The total capacity is 7.8 cubic feet. The freezer capacity is 1.1 cubic feet.
Consul refrigerators are constructed with a gleaming enameled steel exterior and efficient polyurethane insulation. Interior features include two removable compartments for small items, a deep second shelf and humid-cold crisper. Nylon gliding feet, horizontal door handles and dry-cell battery illumination are standard features on every Consul refrigerator.
A safety gas shut-off and piezo igniter assure safe operation at the push of a button. AGA design certified.
How Gas Rerigeration Works -
The continuous absorption type of cooling unit is operated by the application of a limited amount of heat furnished by gas, electricity or kerosene. No moving parts are employed.
The unit consists of four main parts - the boiler, condenser, evaporator and absorber.
The unit can be run on either electricity, kerosene or gas. When the unit operates on kerosene or gas the heat is supplied by a burner which is fitted underneath the central tube (A) and when the unit operates on electricity the heat is supplied by a heating element inserted in the pocket (B).
The unit charge consists of a quantity of ammonia, water and hydrogen at a sufficient pressure to condense ammonia at the room temperature for which the unit is designed.
When heat is supplied to the boiler system, bubbles of ammonia gas are produced which rise and carry with them quantities of weak ammonia solution through the siphon pump (C). This weak solution passes into the tube (D), whilst the ammonia vapor passes into the vapor pipe (E) and on to the water separator. Here any water vapor is condensed and runs back into the boiler system leaving the dry ammonia vapor to pass to the condenser.
Air circulating over the fins of the condenser removes heat from the ammonia vapor to cause it to condense to liquid ammonia in which state it flows into the evaporator.
The evaporator is supplied with hydrogen. The hydrogen passes across the surface of the ammonia and lowers the ammonia vapor pressure sufficiently to allow the liquid ammonia to evaporate. The evaporation of the ammonia extracts heat from the food storage space, as described above, thereby lowering the temperature inside the refrigerator.
The mixture of ammonia and hydrogen vapor passes from the evaporator to the absorber.
Entering the upper portion of the absorber is a continuous trickle of weak ammonia solution fed by gravity from the tube (D). This weak solution, flowing down through the absorber comes into contact with the mixed ammonia and hydrogen gases which readily absorbs the ammonia from the mixture, leaving the hydrogen free to rise through the absorber coil and to return to the evaporator. The hydrogen thus circulates continuously between the absorber and the evaporator.
The strong ammonia solution produced in the absorber flows down to the absorber vessel and thence to the boiler system, thus completing the full cycle of operation.
The liquid circulation of the unit is purely gravitational.
Heat is generated in the absorber by the process of absorption. This heat must be dissipated into the surrounding air. Heat must also be dissipated from the condenser in order to cool the ammonia vapor sufficiently for it to liquefy. Free air circulation is therefore necessary over the absorber and condenser.
The whole unit operates by the heat applied to the boiler system and it is of paramount importance that this heat is kept within the necessary limits and is properly applied.
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