JPS5993157A - 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 (a) Technical Field of the Invention The present invention relates to an improvement in an absorption heat pump that uses heat radiation on the heat radiation side of an absorption/refrigeration cycle, that is, in an absorber and a condenser, to raise the temperature of a heated fluid such as hot water. -1ro.

(b) Prior art and its problems Absorption heat pumps that raise the temperature of the heated fluid by using the heat dissipation effect of the absorber and condenser are driven by energy output, in other words, the heat output of the heated fluid relative to the heating input to the generator. It has a high ratio (i.e. coefficient of performance) and is efficient (it has the advantage of being able to raise the temperature of the heated fluid, but the temperature of the heat source fluid supplied to the evaporator may become too low or the supply of heat source fluid may be insufficient). 1-, the refrigerant vaporization effect in the evaporator is insufficient and the pole ψ
; In the case of
As a result, the refrigerant vapor moves from the absorber to the evaporator, causing a phenomenon of condensation in the evaporator, that is, a reverse heat radiation phenomenon from the heated fluid to the heat source fluid. When the temperature of the heating fluid is low and reverse heat radiation does not occur, crystallization of the absorption liquid and freezing of the refrigerant occur (1α). If the temperature of the heat source fluid supplied to the device or the flow rate of the heat source fluid decreases too much, the temperature of the heated fluid cannot be raised safely and stably (5 problems).

(c) Means for Solving the Problems In view of the above-mentioned problems, the present invention provides a +lt absorption heat pump in which the heat source fluid supplied to the evaporator is at a set temperature of 1 to 1 (where l is below the set flow rate). The refrigerant liquid that is sprayed on the heat source tubes housed in the evaporator and the absorption liquid that is sprayed on the heated tubes housed in the absorber connect the heat source tubes and the heated tubes in a 4ft circuit, respectively. By adopting this circulation switching means, the refrigerant flowing from the generator to the condenser can be prevented from occurring, such as the reverse heat dissipation phenomenon described above or the crystallization of the absorption liquid and freezing of the refrigerant. The present invention provides an absorption heat pump that can safely and stably raise the temperature of a fluid to be heated in the condenser using the heat of steam.

(1) Embodiment drawings are schematic diagrams showing one embodiment of the present invention.
) is equipped with a combustion burner ( 2 ) and heats cold ill from dilute liquid outside! 'lf and wjl! Generator for regenerating liquid, (3
) is a separator that separates θ) air from the generator (1) into liquid and refrigerant vapor. The condenser (6) cools and condenses the fluid to be heated in the heated tube (5), and the condenser (6) cools and condenses the fluid in the heated tube (5). The evaporator (10) distributes the concentrated liquid from the separator (3) to the heated tube (5) housed in the vessel to vaporize it by circulating it into the heat source tube (9). The absorber (11) is a solution heat exchanger that absorbs vaporized refrigerant into a concentrated liquid while being cooled by a heating fluid. Liquid pipe (15
), the condensed refrigerant liquid is passed through the bubble pump (8), and then guided to the refrigerant distributor (1 day) (the refrigerant liquid down pipe (1η), the refrigerant liquid is passed through the bubble pump (8) (Refrigerant liquid pipe (18)
), the bubble pump (8) transfers the refrigerant liquid to the refrigerant disperser (It
', Refrigerant liquid sent by IK - 0 before rising! 'I) and the refrigerant vapor conduit (2t11) to form a circulation cycle of refrigerant and absorption liquid.

(21) is branched from the concentrated liquid pipe (13) and placed at the bottom of the absorber (10) so that the concentrated liquid flowing into the heated pipe (5) bypasses the heated pipe.・＼The first molten pipe is connected to the bypass pipe, and the conduit is equipped with an on-off valve (■,). The concentrated liquid pipe (13) is also equipped with an on-off valve (■,). This is a refrigerant bypass pipe that connects the refrigerant liquid reservoir (7) and the solution reservoir (2a) so that the refrigerant reservoir (7) and the solution reservoir (2a) are connected to each other, and the conduit is equipped with an on-off valve (■3). (S) is the heat source pipe (9) Temperature detector (
or a flow rate detector), when the heat source fluid is below the set temperature (or set flow rate) according to the signal of the detector, the on-off valves (■,), (v3) are opened and the on-off valve (v2) is closed. ,
The heat source fluid is higher than the set temperature (or higher than the set flow rate)
At this time, the switching valve 51/C can be switched to close the on-off valves (1) and (3) and open the on-off valve (V2).

In an absorption heat pump with such a configuration, the evaporator (Gl
The energy of the heat source fluid supplied to the
When the refrigerant vaporization effect in the evaporator (6) becomes insufficient, the c liquid that has been sprayed on the heated tube (5) flows into the solution bypass tube (2).
The refrigerant liquid that had been distributed through the heat source pipe (9) while flowing through the refrigerant bypass pipe (2) passes through the refrigerant bypass pipe (2) and undergoes refrigerant vaporization in the evaporator (6) and refrigerant absorption in the absorber (10). is stopped, and the heated fluid flowing inside the heated tube (5) is heated from the generator (,1) in the condenser (5).
Due to the heat of the refrigerant vapor flowing through the container (3)! One vortex is created.

That is, the saturated vapor pressure of the absorption liquid sprayed onto the heated pipe (5) of the absorber (10) is higher than that of the refrigerant vapor of the evaporator (6), and the refrigerant vapor evaporates from the absorber (1 (1) side). Vessel (6
) side and condenses in the heat source tube (9) of the evaporator.In other words, the heat of the heated fluid is released to the heat source fluid, so that the so-called reverse heat radiation phenomenon can be prevented. The circulation cycle is switched (M'J, in other words, shifts to boiler operation).

In addition, if the heat source fluid supply temperature drops too much or the supply ■° is too small, the temperature of the heated fluid flowing into the absorber (10) is low (even if the temperature of the heated fluid flowing into the absorber (10) is low, the refrigerant absorption effect at lr absorption 5flO+ continues. Then, the evaporator (6) and absorber 0
0) When the white beads drop and the refrigerant freezes, the heat source fluid freezes and extends.Celsius can cause adverse effects such as crystallization of the absorption liquid, but in absorption refrigeration 4 of the present invention, the supply temperature or Since the refrigerant absorption action of the absorber (10) and the refrigerant vaporization action of the F generator (6) are stopped before the amount decreases too much, these adverse effects are also prevented.

Furthermore, the refrigerant liquid in the cold p% liquid reservoir (7) is prepared as a solution (24).
Since the concentration of the absorption liquid mixed in the absorption liquid and flowing into the generator (1) is 5/C, the boiling temperature of the absorption liquid in the generator becomes lower, and as a result, when the boiler is operated, the absorption liquid It also has the advantage of saving energy for separate equipment.

Note that the refrigerant liquid bypass path is not limited to those shown in the figure, but includes, for example, a refrigerant liquid pipe (151 (7)) and a pipe connecting the σf liquid pump (141 suction side). (not shown), - The condensed refrigerant liquid is led directly to the suction solution reservoir (24) (pipe (not shown), or O. This may also be replaced by a combination of pipes, etc. 2. The circulation mechanism is not limited to the one shown, for example, the detector (9) and the absorber for the heated fluid (I O+OIL detects human temperature).
On-off valve (V, ), (
V2) and (V, ) 0) 1jil close may be switched (or a three-way valve (not shown) may be used in place of the on-off valves (V, ) and (v2).

In addition, as shown in the figure, transfer the refrigerant liquid from the bubble pump (8) to an absorption heat pump that pumps liquid 1. %+iF contraction: Morning 4) and evaporator (6) pressure difference is small 7. When the boiler is operated, the pumping power of the bubble pump (8) decreases and the flow of the refrigerant drops significantly, resulting in 7111 points of refrigerant remaining in the condenser (4) and the refrigerant reservoir The circulating absorption liquid gradually becomes overconcentrated and tends to crystallize.
Providing a refrigerant bypass path is useful in 11 cases.

On the other hand, in an absorption heat pump having such a configuration.

When there is sufficient energy in the heat source fluid supplied to the evaporator (6), in other words, when the temperature and flow rate of the heat source fluid are higher than the set values, the on-off valve ( V, ), (■3) are closed, and the on-off valve (V
, ) are opened and the temperature of the applied fluid (fluid is raised by the heat radiated by the refrigerant absorption action of the absorber (10) and the heat radiated by the refrigerant absorption action of the condenser (5), so-called heat pump operation is performed. 1) 6. The set humidity or temperature of the heat source fluid should be determined as appropriate according to the specifications of the absorption pump. You may also use

In addition, if an abnormality occurs such as dry firing in the generator (1) or locking of the solution pump (1a) due to crystal formation in any part of the absorption liquid circulation system, the on-off valves (V, ), (■2),
(■ It is preferable to dilute the absorption liquid by opening 141ff.) Also, before stopping the operation of the absorption heat pump, open the on-off valves (V, ), (V2), and (V3).
It is desirable to perform an absorption liquid dilution operation.

(E) Effects of the Invention As described in (H) above, the absorption heat pump of the present invention is effective when the heat source fluid flowing in the heat source tube housed in the evaporator exceeds the set temperature and set flow rate and has sufficient energy. The temperature of the heated fluid is raised by performing efficient so-called absorption heat pump operation, and the heat source fluid is lowered to below the set temperature or set flow rate.1. A so-called absorption heat pump is created by switching the circulation cycle of the refrigerant and absorption liquid so that the refrigerant liquid sprayed on the C filter and the heat source tube bypasses the limb pipes, and the absorption liquid sprayed on the heated tube bypasses the limb pipes. Since it allows the transition from operation to boiler operation, it is possible to transfer the heated fluid while preventing adverse effects such as the reciprocal thermal phenomenon from the heated fluid to the heat source fluid, freezing of the refrigerant, and crystallization of the absorption liquid. This has the effect of raising the temperature safely and stably.

[Brief explanation of drawings]

The drawing is a schematic explanatory diagram of a circuit configuration showing one embodiment of the present invention.
It is. (1)...generator, (4)...condenser, (5)
... Heated tube, (6) ... Evaporator, (8) ...
Bubble pump, (9)... Heat source tube, θ0)... Absorber, (Group... Solution heat exchanger, (21)... Melt 6
bypass pipe, (23)...refrigerant bypass pipe, (
S)...Detector, (■,), (v2), (■,)...
・Opening/closing. Applicant Sanyo 1E4JJ Co., Ltd. and 1 other agent Patent attorney Shizuo Sano

Claims (1)

[Claims] (The 11 generator, condenser, evaporator, absorber, and solution heat exchanger are connected via piping to form a circulation cycle of refrigerant and absorbed 11 g liquid, and the heated fluid in the heated tubes housed in the absorber and condenser is In an absorption heat pump that raises the temperature of a heat source tube, a solution bypass path is provided so that the absorption liquid sprayed on the heated tube bypasses the heated tube, and the refrigerant liquid sprayed on the heat source tube housed in the evaporator flows through the heat source tube. A refrigerant bypass path is provided to bypass the heat source, and when the heat source fluid flowing in the heat source tube becomes lower than a set temperature or a set flow rate, the circulation cycle of the refrigerant and absorption liquid is switched via the solution bypass path and the refrigerant bypass path. An absorption heat pump characterized by having a structure.