JPH0195258A - Air-cooled type absorption refrigerator - Google Patents

Abstract

PURPOSE: To reduce the performance reduction of an evaporator and improve the performance of an air-cooled absorption refrigerator by providing the cooler of a refrigerant liquid halfway through a refrigerant liquid path from an air- cooled condenser to an evaporator. CONSTITUTION: While the top part of a cooler CR being arranged at the most upstream side of the fresh air being sent by a blowing machine F and the bottom part of a cooling pipe CT of a condenser C are connected by a pipeline with a pump PR, the bottom part and sprinkler 4 of an evaporator E are connected by a pipeline TR2 . Also, the fresh air is blown from a blower F in the order of the cooler CR, heat transfer pipes A3 , A2 , and A1 of an absorber A, and the cooling pipe CT o the condenser C. Since the temperature and the steam pressure of the refrigerant liquid being guided from the condenser C to the heat transfer pipe ET of the evaporator E are lowered by the cooler CR, more uniform liquid film of the refrigerant liquid can be easily formed on the inner wall of the heat transfer pipe ET and the performance of the evaporator E can be improved by that amount.

Description

Detailed Description of the Invention (a) Industrial Application Field The present invention relates to an evaporator and an air-cooled type evaporator that removes heat from a medium such as air outside the tube by flowing a refrigerant liquid along the inner wall surface of a heat transfer tube and using the vaporization action of the refrigerant liquid. This invention relates to an improvement of an air-cooled absorption refrigerator using an air-cooled absorber and an air-cooled absorption refrigerator.

(b) Conventional technology As a conventional technology for the above-mentioned air-cooled absorption refrigerating machine, as shown in Japanese Patent Application Laid-open No. 57-198969, the refrigerant liquefied in an air-cooled condenser is air-cooled at almost the same temperature level. A configuration in which the heat exchanger is guided to a heat exchanger tube of a type evaporator is known.

(c) Problems to be solved by the invention In the conventional air-cooled absorption refrigerator as described above, the saturation temperature and saturated vapor pressure of the refrigerant liquid introduced into the heat transfer tube of the evaporator are almost the same as those in the condenser. Therefore, when the refrigerant liquid flows into the heat transfer tube, it flashes violently, and as a result, a large amount of refrigerant droplets fall through the space of the heat transfer tube without being vaporized. There is a problem in that the formation of a refrigerant liquid film on the inner wall surface of the tube is also likely to be insufficient, resulting in insufficient capacity of the evaporator and a decrease in the performance of the absorption refrigerator.

In particular, in absorption refrigerators using air-cooled condensers, when the outside temperature is high and a large refrigeration output is required, the difference in saturated vapor pressure between the condenser and evaporator increases, causing the refrigerant liquid in the evaporator to increase. As the intensity of the flash increases, there is a problem in that the refrigeration output tends to decrease further.

In view of these problems, the present invention alleviates the flash of refrigerant liquid in the heat transfer tube of the evaporator, reduces the performance deterioration of the evaporator, and improves the performance of the air-cooled absorption refrigerator compared to that of the conventional one. It is also aimed at improving the

(d) Means for Solving the Problems The present invention, as a means for solving the above-mentioned problems, provides a solution to the refrigerant liquid path from the air-cooled condenser to the evaporator of the air-cooled absorption refrigerator having the above-mentioned configuration. It is characterized by being equipped with a refrigerant liquid cooler and forming a passage through which air flows sequentially from the cooler to the air-cooled condenser via the air-cooled absorber.

(f) Function In the absorption refrigerator of the present invention, the refrigerant liquid cooler functions to lower the temperature level of the refrigerant liquid flowing into the heat transfer tube of the evaporator and lower its saturated vapor pressure. The intensity of the flash caused by self-evaporation of the refrigerant liquid is reduced. This reduces the amount of droplets that fall unevaporated inside the heat transfer tube, and also reduces the non-uniformity of the liquid film that forms along the inner wall surface of the heat transfer tube, resulting in a reduction in evaporator performance degradation. is brought about. Moreover, compared to the conventional air-cooled absorption refrigerator which does not include the above-mentioned cooler, the performance is improved. Furthermore, the cooler, absorber, and condenser can be arranged side by side in a compact manner in the air passage, thereby making it possible to downsize the air-cooled absorption refrigerator.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The drawings are schematic structural diagrams showing one embodiment of an air-cooled absorption refrigerator according to the present invention.

In the figure, (G) is a direct-fired generator, (C) is an air-cooled condenser, (A) is an air-cooled absorber, (E) is an air-cooled evaporator, (
H8) is a solution heat exchanger.

(F is the blower for the evaporator (E), and this and the evaporator (E)
) forms an indoor unit, while the above-mentioned devices other than these devices and the blower (F) form an outdoor unit.

<AI), (AI), and (As) are heat exchanger tubes for the absorber (A), respectively, which are arranged vertically, and are connected to a pipe (T,) with a pump (FAI), and a pump (PAn). ) with pipes (connected in series with T-strings).

(1), (2), and (3) are heat exchanger tubes (Al
), (AI), (AJ) This is a sprayer that drops the absorption liquid onto the horizontal layer edges of the pipes, and the absorption liquid dripped from here flows down along the inner wall of the pipe and absorbs the gaseous refrigerant inside the pipe. Then, a heat transfer tube ('rt,) with a pump (P,) is connected to
The bottom part of the solution heat exchanger (A,) is connected to the dilute liquid inlet of the solution heat exchanger (H), while the concentrated liquid outlet and the sprayer (1) are connected to the pipe (T14).
．． ) are connected. Note that fins are provided on the outer walls of these heat exchanger tubes.

In addition, while the dilute solution inlet of the generator (G) and the dilute solution outlet of the solution heat exchanger (H8) are connected through the pipe (rt*), this concentrated solution inlet and the concentrated solution outlet of the generator (G) and are connected by a conduit (T□).

(Dec) shows the gas phase part of the generator (G) and the air-cooled condenser (C
), and (Ca) is a duct connecting the condenser (C
) is a finned heat dissipation tube.

(D!A) shows the gas phase part of the evaporator (E) and the air-cooled absorber (A!
), and (ET) is the duct connecting the evaporator (E
) is a finned heat exchanger tube that is vertically arranged. In addition, (4) is a sprayer that drips refrigerant liquid onto the horizontal layer edge of the heat transfer tube (E, r). It vaporizes and cools the air with its latent heat.

In addition, (CIl) is a cooler placed on the most upstream side of the outside air sent by the blower (F), and the top of the cooler and the condenser (C
) is connected to the bottom of the heat dissipation pipe (Ca) by a pipe (Ll) with a pump (P, ), while the bottom and the diffuser (4) of the evaporator (E) are connected by a pipe (Ttz). It is. Although not shown, the pipe (Lx) may also be equipped with a pump, or the bottom of the heat transfer tube (ET) and the suction side of the pump (P,) may be connected by a pipe.

In addition, the heat exchanger tubes (AI) of the cooler (C6) and absorber (A)
.

(At), (As), heat dissipation tube (CT) of condenser (C)
) The outside air is sent by a blower (F) in this order.

In an air-cooled absorption refrigerator with such a configuration (hereinafter referred to as this machine), the temperature and vapor pressure of the refrigerant liquid led from the condenser (C) to the heat transfer tube (H7) of the evaporator (E) are (Since the temperature is lowered by C-, the intensity of the flash due to self-evaporation of the refrigerant liquid flowing out from the sprayer (4) is weakened compared to the conventional one not equipped with this cooler, and
The degree of negative effect on the formation of a liquid film on the inner wall surface of the heat transfer tube is reduced, and the amount of droplets that fall unvaporized in the space inside the tube is also reduced, improving heat exchange between the air outside the tube and the liquid refrigerant inside the tube. reduction in rate is reduced. In other words, compared to conventional models that do not have a cooler (cm), this machine uses heat exchanger tubes (El
) A more uniform liquid film of the refrigerant liquid is easily formed on the inner wall, and the performance of the evaporator (E) is improved accordingly.

By the way, while sending outside air at about 35°C to the cooler (R) of this machine, the temperature of the refrigerant liquid is lowered by about 20°C to about 40°C.
When the refrigerant liquid is dripped into the heat transfer tube (ET) and the refrigerant liquid is vaporized at about 10℃ in the tube, and when the refrigerant liquid is vaporized at about 10℃ from the condenser (C).
As a result of an experiment, we compared a case where a 0"C refrigerant liquid was dropped into a heat exchanger tube (ET) and vaporized under almost the same conditions. Refrigeration capacity increases by about 20Kcal,
It was also confirmed that there was an effect of improving refrigeration efficiency by about 4%.

The outside air temperatures at the cooler (cm) outlet side, absorber (A) outlet side, and condenser (C) outlet side are 35.1℃ and 35.1℃, respectively.
9°C and 42.1°C.

As mentioned above, this machine connects the cooler (CI), air-cooled absorber (A>, and air-cooled condenser (C>) to the blower (F
), it has a structure that is compactly arranged side by side on the downstream side, and has practical value as it has higher performance than conventional air-cooled absorption refrigerators and can be made smaller than conventional ones.

(G) Effects of the Invention As described above, the present invention provides an air-cooled absorption refrigerator having an evaporator that cools a medium such as air outside the heat transfer tube with the latent heat of vaporization while flowing a refrigerant liquid along the inner wall surface of the heat transfer tube. In this method, the refrigerant liquid flowing into the heat transfer tube of the evaporator has the effect of alleviating the flash of the refrigerant liquid, which is an impediment to the formation of a uniform liquid film on the inner surface of the tube, and reducing the reduction in the capacity of the evaporator. In addition, it is particularly useful as an effect of improving the performance of an air-cooled absorption refrigerator having an air-cooled condenser where the temperature level of the condensed refrigerant tends to be higher than that of a conventional one compared to a water-cooled condenser.

Furthermore, according to the present invention, the cooler, air-cooled absorber, and air-cooled condenser can be placed close to each other and arranged compactly in the air passage, making it possible to downsize the air-cooled absorption refrigerator. becomes.

[Brief explanation of the drawing]

The drawing is a schematic structural explanatory diagram showing one embodiment of an absorption refrigerator according to the present invention. (G)...generator, (E)...evaporator, (C)
...air-cooled condenser, (A)...air-cooled absorber,
(C1)...Cooler, (rat), (rat)...
Pipeline, (F)...Blower.

Claims (1)

[Claims] (1) Form an evaporator that cools the air outside the tube with the latent heat of vaporization while flowing a refrigerant liquid along the inner wall surface of the heat transfer tube, and connect this with equipment such as an air-cooled condenser, an air-cooled absorber, and a generator. In an air-cooled absorption refrigerating machine configured by connecting piping, a refrigerant liquid cooler is installed in the middle of the refrigerant liquid path from the air-cooled condenser to the evaporator, and from this cooler to the air-cooled absorber An air-cooled absorption refrigerating machine characterized by a passageway that sequentially flows air to an air-cooled condenser.