Refrigeration – Automatic control – Of external fluid or means
Patent
1986-11-13
1988-01-19
Tanner, Harry
Refrigeration
Automatic control
Of external fluid or means
62180, 62201, 236 47, 236 91R, F25D 1704
Patent
active
047197633
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention relates to a device for changing the temperature of a room and more specifically to a control system for a device in which room air is passed through a heat exchanger for heat exchange with a cooling liquid, the cooling liquid being cooled by a refrigerant circuit.
STATE OF THE ART
Devices for circulating air through heat exchangers and consequently lowering the room temperature from 35.degree.-30.degree. C. to 25.degree.-20.degree. C. in hotels, restaurants and offices in hot (tropic) countries are known. Despite the fact that a number of such devices and apparatuses of different sizes and designs are available on the market at varying prices it is found that such a comfort is lacking in many places inspite of the fact that a present indoor temperature is greatly needed and desired.
The reasons for this are numerous. One reason may be that existing compressors and fans generate such noise that the devices will be disturbing, especially at night. Another reason is that the power consumption is so high that the mains in many cases does not stand these additional loads. Moreover, bulky designs can make the devices unsuitable e.g. for small hotel rooms.
Another reason is that the room temperature generated often can not be easily adjusted to get the desired comfort; the difference between outdoor temperature and room temperature can for instance be too great to be correctly adapted and pleasant to the body.
It is the object of this invention to eliminate the disadvantages now mentioned and others.
SUMMARY OF THE INVENTION
In general it can be said that the cooling system of the device contains matter in at least two different states of phase. The amount of matter in a certain state of phase can however be so small in a borderline case the the cooling system of the device operates in practice with matter in one phase only, e.g. liquid phase.
The different states of phase can be liquid phase and solid phase or liquid and gas phase or else a combination of liquid phase/solid phase and liquid phase/gas phase.
In order to simplify in the following the detail description given under the heading PREFERRED EMBODIMENT a device with a cooling system containing a medium in liquid phase and solid phase is described there.
With such a design of the cooling system of the device that a portion of a circulating liquid is converted into ice in the refrigerant accumulator of the device the capacity is increased and the dimension reduced, and by such a way of function that the refrigerant accumulation substantially takes place during the day in hotel rooms and at night in office rooms it is possible to eliminate disturbing noise almost completely when the rooms are utilized. By having the device working so that the room air is cooled down for a substantially less part of the day than the part of the day during which the required cold is generated and accumulated the power consumption of the device is further substantially reduced.
BRIEF DESCRIPTION OF DRAWINGS
The invention will be described in greater detail in connection with the enclosed drawing where
FIG. 1 shows schematically a hotel room with built-in device according to the invention and
FIG. 2 shows schematically an electric circuit diagram for controlling the device of FIG. 1.
FIG. 3 is a more detailed view of the refrigerant circuit and cooling circuit of FIG. 1, and
FIG. 4 is a fragmentary view, on an enlarged scale, of part of FIG. 3.
PREFERRED EMBODIMENT
In FIG. 1 a hotel room 10 is shown where a device 11-12-13 according to the invention is installed. The device comprises a refrigerant generator 11-12, the compressor part of which is placed on the outside of the room 10. A pipe system 111 for circulating liquid (e.g. NaCl or KOH) leads the liquid to/from a refrigerant accumulator 12 within the room. The air of the room is circulated by a means 13, e.g. a fan, past the cold accumulator where, thus, the temperature of the air is lowered. The different parts of the device are so dimensioned and arranged that in the daytime
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