JPS62294864A - Absorption heat pump - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] 3. Detailed Description of the Invention A) Field of Industrial Application The present invention focuses on the temperature of the absorption liquid in the generator. and the saturated vapor pressure and its temperature in the absorber? and the saturated vapor pressure (and the liquefaction temperature and saturated vapor pressure of the refrigerant in the condenser are lower than its vaporization temperature π and saturated vapor pressure in the evaporator). Regarding improvements to heat pumps.

(B) Conventional Technology As a conventional technology of the above-mentioned type of absorption heat pump, for example, as seen in Japanese Patent Laid-Open No. 58-69372, unvaporized refrigerant in an evaporator is passed into a liquefied refrigerant reservoir in a condenser. A refrigerant liquid circuit in which the refrigerant liquid is returned to the evaporator by a refrigerant pump after being merged with the refrigerant liquid is formed by forming a pressure between the evaporator and the condenser [hereinafter referred to as
After the liquefied refrigerant in the condenser is sent to the unvaporized refrigerant reservoir of the evaporator using a refrigerant pump, the unvaporized refrigerant mixed with the liquefied refrigerant is evaporated using a refrigerant pump separate from this pump. There is one in which a refrigerant liquid path for recirculation to the container is formed between the evaporator and the condenser (hereinafter referred to as the second conventional example).

What is the problem that the invention attempts to solve in the first conventional example? In this case, the unvaporized refrigerant flows into the liquefied refrigerant reservoir of the low-pressure side condenser while remaining at a high temperature close to the saturation temperature in the evaporator, where it flash-evaporates violently. Heat losses such as losses due to overflow to the container side and losses due to re-liquefaction of self-evaporated refrigerant are large, and the temperature of the obtained heated fluid increases due to changes in external conditions such as cooling water temperature. There are also problems that make it easy to hunt.

Although the second conventional example 3 can reduce the heat loss that occurs in the first conventional example, it requires multiple refrigerant coating pumps and a large capacity unvaporized refrigerant reservoir. be.

In addition, even if the second conventional example is 8, if the amount of low-temperature liquefied refrigerant flowing into the unvaporized refrigerant reservoir of the evaporator fluctuates intermittently due to changes in external conditions such as cooling water temperature, this fluctuation will occur in the evaporator and Since this affects the vapor pressure and saturation temperature within the absorber, there is a problem in that the temperature of the heated fluid changes, although not as much as in the first conventional example. In particular, large hunting occurs in the temperature of the heated fluid when the liquefied refrigerant pump starts and stops.

The object of the present invention is to provide an absorption heat pump of the above type that can solve the problems of the first and second conventional examples and can reduce the temperature change of the resulting heated fluid. .

B) Means for Solving the Problems The present invention provides an absorption heat pump of the above type, in which unvaporized refrigerant from the evaporator bypasses the condenser and is guided to the suction port of the liquefied refrigerant pump. The feature is that a refrigerant circuit is formed so that the refrigerant is returned to the evaporator together with the refrigerant.

(E) Function In the absorption heat pump of the present invention, one liquefied refrigerant pump uniformly mixes low-temperature liquefied refrigerant and a large amount of high-temperature unvaporized refrigerant to return the refrigerant to the evaporator. It has the effect of reducing hunting in the temperature of the liquid, and the unvaporized medium acts as a pump head, so compared to the second conventional example, the frequency of starting and stopping the pump is significantly reduced (and the evaporator 8 Also, intermittent changes in vapor pressure and temperature within the absorber can be reduced, and the temperature of the resulting heated fluid can be further stabilized.

Further, since the high temperature unvaporized refrigerant bypasses the condenser on the low temperature and low pressure side and is returned to the evaporator, heat loss as in the first conventional example does not occur.

(F) Embodiment The drawing is a schematic configuration diagram showing an embodiment of an absorption heat pump according to the present invention. In the figure, (1) is an evaporative absorber consisting of an evaporator (2) and an absorber (3), a generation condenser (consisting of a 4-unit generator (5) and a condenser (6), and (7) is a solution Heat exchanger, (P,) is a pump for refrigerant liquid,
(P,) is a solution pump, and by connecting these devices with piping, a circulation path for the refrigerant [water] and the solution [lithium bromide aqueous solution] is formed.

(8) is the heat supply for the evaporator (2), (9) is the absorber (3)
The heated device, +10) is the heater of the generator (5), (11
) is the cooler of the condenser (6), α2 is the unvaporized refrigerant reservoir of the evaporator (2), Q31 is the liquefied refrigerant reservoir of the condenser (6), α and a9 are the absorber (3) and the generator, respectively. This is the solution reservoir of (5).

(16), (17), the conduit is for sending the concentrated solution, (1
9. (A) is the pipe through which the cold bath liquid flows, (21) is the pipe for liquefied refrigerant flowing down, ■ is connected to the pipe for liquefied refrigerant flowing ■, and the lower end is connected to the suction port side of the refrigerant liquid pump (Pl). 123) is a conduit for unvaporized refrigerant flowing down which opens to the refrigerant liquid pump (P
This is a pipe line that guides the liquefied refrigerant and unvaporized refrigerant discharged by the evaporator (2) to the refrigerant distribution device 04) of the evaporator (2).

In addition, (c) and (c) are pipes through which heat source fluids such as waste hot water, waste steam, or hot water using solar heat flow, respectively, and the frames are pipes through which heated fluids such as water and brine flow, and @ is the cooling fluid. It is a pipe through which water flows.

In an absorption heat pump (hereinafter referred to as this machine) with such a trap configuration, for example, waste water from a factory flows through the heat supply (8) and the heater α0), and at the same time, the outside air temperature flows into the cooler (11). The heated device (
9) By operating with K water circulating, an absorption heat pump cycle is created in which the force of the evaporative absorber fi+ is kept at a higher temperature level than the generating condenser (4), and the heated device (9)
The water in the heated device (9) is heated by the heat generated when the absorption liquid sprayed on the evaporator absorbs the vaporized refrigerant from the evaporator (2), and the water in the heated device (9) is heated. Hot water with a higher temperature level than hot water can be obtained.

In this machine, the low-temperature liquid refrigerant that is liquefied little by little in the condenser (6) and the large amount of unvaporized refrigerant at a high temperature level in the evaporator (2) are transferred to the refrigerant liquid pump (P8). After being mixed, it is sent to a refrigerant spreader (goods). As a result, the temperature of the liquid refrigerant flowing into the refrigerant diffuser 24+ is close to the liquid temperature of the unvaporized refrigerant reservoir α, that is, the temperature of the liquid refrigerant flowing into the refrigerant diffuser 24+, that is, the temperature of the liquid refrigerant in the evaporator f21 K:
The vaporization temperature of the refrigerant becomes a value close to that of the refrigerant.

In addition, since the liquefied refrigerant and the unvaporized refrigerant are sufficiently mixed in the refrigerant liquid pump (Pl), the temperature distribution of the liquid flow in the pipe line (23) becomes uniform, and the liquid refrigerant flowing into the refrigerant distribution device 04 The temperature of the refrigerant pump (
The evaporator ( Fluctuations in the amount of liquid refrigerant sprayed to the heat supply device (8) in 2) are buffered by the above-mentioned function.

For this reason, on this machine? In this case, the vapor pressure and temperature inside the evaporator-absorber (1) are kept more stable than in the conventional case, and hunting in the temperature of the resulting heated fluid is reduced.

In addition, in this machine, the high-temperature unvaporized refrigerant flows into the low-pressure side condenser (6) and flash evaporation is prevented by bypassing this condenser while allowing the unvaporized refrigerant to join the liquefied refrigerant. , generation of thermal radiance due to flash evaporation of unvaporized refrigerant is also prevented.

Although not shown in the drawings, in this machine, the evaporator and absorber are formed in separate containers, and they are connected by a duct for vaporized refrigerant, and a generator is also installed. Of course, it is also possible to form the container and the condenser in separate containers and connect them with a duct for refrigerant vapor.

(g) Effects of the Invention As described above, the present invention provides an effect of reducing heat loss by preventing flash evaporation of the refrigerant in an absorption heat pump that obtains a heated fluid at a temperature higher than the heat source fluid temperature, and an effect of reducing heat loss by preventing flash evaporation of the refrigerant, and The above-mentioned type of absorption heat pump has the effect of reducing the temperature nozzle of It is of high practical value, as it makes it possible to

[Brief explanation of the drawing]

The drawing is a schematic structural explanatory diagram showing an embodiment of an absorption heat pump according to the present invention. (2)...Evaporator, (3)...Absorber, (5)
...generator, (6)...condenser, (P,)...
・Refrigerant liquid pump, (8)...heater, (9)・
・Heated device, C12+ ・Unvaporized refrigerant reservoir, α～・
...Liquefied refrigerant reservoir, 011...Liquefied refrigerant flow pipe line,
C2... unvaporized refrigerant flow pipe line, 2J... pipe line.

Claims (1)

[Claims] (1) Heat source fluid is supplied to the evaporator and generator while cooling water flows through the condenser, and the generator, condenser, evaporator, and absorber In an absorption heat pump configured with equipment such as piping, the downstream end of the pipe for distributing the unvaporized refrigerant of the evaporator opens at or near the suction port of the refrigerant liquid pump that sends the refrigerant liquefied in the condenser to the evaporator. An absorption heat pump characterized in that a conduit for distributing unvaporized refrigerant is connected to a conduit for liquefied refrigerant leading from a condenser to a pump for refrigerant liquid.