JP3224766B2 - Double effect absorption chiller / heater - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a double-effect absorption chiller / heater, and more particularly to a hot water regenerator for hot water only operation (single operation of hot water with no solution flowing in and out of the high temperature regenerator). The present invention relates to a double-effect absorption chiller / heater capable of blocking a refrigerant path from a condenser and an evaporator.

[0002]

2. Description of the Related Art Conventionally, in a chiller / heater which simultaneously takes out cold water and hot water, a system in which refrigerant vapor from a high-temperature regenerator is introduced into a hot water heater and hot water is taken out by the latent heat of condensation is generally adopted. If there is no chilled water load and only hot water load, the high-temperature regenerator and hot water heater are separated from the absorber, evaporator, condenser, and low-temperature regenerator (heated side) as a dedicated hot water operation, and high-temperature regeneration is performed. It was necessary to shut off the refrigerant path and the solution path from the vessel. Further, even in a chiller / heater operated by switching between the cooling operation and the heating operation, a hot water heater similar to the above may be provided, and in the heating operation in this case, the same separation and interruption as described above is necessary. Met.

Conventionally, as shown in FIG. 3, a valve is provided in the refrigerant vapor pipe 13 from the high-temperature regenerator GH to shut off the pipe. In this case, the pipe diameter is large, the valve becomes expensive, and the mounting space is small. It becomes a big valve. Further, since the generated steam is superheated steam and has a high temperature, there are problems that an expensive seal and a large opening / closing torque are required to maintain the fully closed performance. In order to solve this problem, there has been known a method in which a valve is provided in a refrigerant pipe at an outlet of a low-temperature regenerator (heating side) to shut off the refrigerant pipe.
The refrigerant liquid accumulates in the regenerator and the amount of solution in the high-temperature regenerator is insufficient. In the case of the direct fire type, there is a danger of empty firing, and there is a danger that the concentration increases and there is a danger of stopping crystals. was there.

[0004]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems of the prior art, and eliminates the problem of providing a valve in the steam pipe by providing a valve in the refrigerant liquid pipe, and also removes hot water. It is another object of the present invention to provide a double-effect absorption chiller / heater in which the amount of solution in the high-temperature regenerator is not insufficient and there is no danger of boil-off or crystallization.

[0005]

In order to solve the above problems, the present invention provides an absorber, an evaporator, a high temperature regenerator, a low temperature regenerator, a condenser, a high temperature solution heat exchanger, a low temperature solution heat exchanger,
A hot water heater, a solution pump, and a solution path and a refrigerant path for connecting these devices are provided. The refrigerant path is from a refrigerant branch point that separates refrigerant vapor generated from the high-temperature regenerator, and one is a heating side of the low-temperature regenerator. And a double-effect absorption chilled and heated water path, which is a refrigeration cycle system refrigerant path from the condenser to the evaporator via the hot water heater, and the other is a hot water cycle system refrigerant path from the hot water heater to the high temperature regenerator. In the apparatus, a valve a is provided in a refrigerant pipe exiting a heating-side outlet of a low-temperature regenerator in the refrigeration cycle system refrigerant path, and a high-temperature regenerator is provided in a refrigerant pipe between the heating-side outlet of the low-temperature regenerator and the valve a. Connected to a refrigerant pipe provided with a valve b toward the hot water cycle system.
Refrigerant having valve e connecting water heater and condenser or evaporator
Rutotomoni provided piping, and the solution pipe from the solution pump outlet of the solution route to the high temperature regenerator inlet, to a solution piping from the high-temperature regenerator outlet to the absorber, in which each valve c, and d provided .

In the double effect absorption chiller / heater, the valve a
And the valve b can be integrated into a three-way valve. When hot water is taken out from the hot water heater, the valves a, c and d are closed and the valve b is opened, so that the high-pressure regenerator And the hot water heater can be separated from the absorber and the evaporator. In addition, a refrigerant pipe having a valve e connecting the hot water heater and the condenser or the evaporator is provided , and a refrigerant liquid generated at the time of hot water heating is guided to a refrigerant cycle system, and a chiller / heater for exhibiting a refrigeration effect. In
In this case, in order to take out hot water from the hot water heater, the high pressure regenerator and the hot water heater are connected to the absorber and the evaporator by closing the valves a, c, d and e and opening the valve b. Etc. can be separated. As described above, in the present invention,
A valve a is provided in the pipe from the high-temperature regenerator to the condenser (or evaporator) through the low-temperature regenerator (superheated side) to separate the high-temperature regenerator from the low-temperature regenerator (superheated side). The piping to the condenser (or evaporator) is a refrigerant liquid piping,
The pipe diameter is very small. For example, an absorption refrigerator using water as a refrigerant often has a diameter of about 1/5 to 1/10. The refrigerant piping system is at a saturation temperature, and the conditions are relaxed in terms of temperature.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the drawings. FIG. 1 shows a flow chart of the double effect absorption chiller / heater of the present invention. In FIG. 1, an absorber A, an evaporator E,
A high temperature regenerator GH, a low temperature regenerator GL, a condenser C, a hot water heater W, a high temperature heat exchanger XH, and a low temperature heat exchanger XL are provided. As a solution path, a solution pump PS, a valve c, a valve d, lines 1, 2, 3, 4, 5, 6, 7, 8, 9, 10,
11, a part of each of the above devices is connected to form a solution circulation path. The refrigerant path includes a refrigeration cycle type refrigerant path and a hot water cycle type refrigerant path.

The refrigeration cycle system refrigerant path passes from the pipe 12 through the refrigerant branch point 20, through the pipe 13 and the heater 14,
The line is branched into a line 15 having a valve a and a line 16 having a valve b. The line 15 passes through a condenser C from a line 17 through an evaporator E.
The pipe 16 evaporates from the solution in the low-temperature regenerator GL via the high-temperature regenerator through the valve b to the high-temperature regenerator, condenses in the condenser C, and evaporates through the pipe 17. And a refrigerant pump PM and pipes 18 and 19 for repeatedly circulating the refrigerant to the evaporator E.
And an evaporator-based refrigerant path. The hot water cycle system refrigerant path is connected to the high temperature regenerator GH from the pipe 12 via the refrigerant branch point 20, the pipe 21, the heating side 22 of the hot water heater W, and the pipe 23.

26 and 27 are cooling water pipes, 28 is a cold water pipe, 2
9 is a heating tube, 30 is a heat source calorie control valve, and 31 and 3
Reference numeral 2 denotes a temperature detector for detecting a cold water load or a hot water load. Further, the valves a and b may be provided as a three-way valve integrated at a branch point where a pipe passing through the heater 14 branches into a pipe 15 and a pipe 16. In FIG. 1, when taking out hot water from the hot water heater W during the heating operation, the valve a is closed to block the refrigerant from flowing into the condenser C, and the valve c is closed.
And the valve d are closed, the solution is blocked from circulating to the absorber A, and the valve b is opened, so that the refrigerant liquid accumulated in the heater 14 from the pipe 13 passes through the pipe 16 and is regenerated at a high temperature. It flows into the vessel and increases the amount of solution in the high-temperature regenerator, preventing the generation of crystals during idle heating or during shutdown. Then, the refrigerant vapor exits from the high-temperature regenerator GH and passes through the pipe 12, the branch point 20, and the pipe 21.
And enters the heating side of the hot water heater W, overheats the hot water and turns into a refrigerant liquid and circulates through the pipe 23 to the high temperature regenerator GH.

FIG. 2 shows another flow chart of the dual-effect absorption chiller / heater of the present invention, which is a chiller / heater for simultaneously taking out cold water and hot water. The difference from FIG. 1 is that FIG. Valve e branched at branch point 24 from line 23 from hot water heater W
Is connected to the refrigerant line 17 from the condenser C, and the valve f and the valve g are added. Adjustment of the hot water capacity when there is both a cold water load and a hot water load is performed by operating the valve g according to the signal of the temperature detector 32, and the adjustment of the cold water capacity is performed by operating the valve f according to the signal of the temperature detector 31. .
The heat source calorie control valve is adjusted using a larger signal (a signal for increasing the valve opening) of the cold water signal and the hot water signal. In such a chiller / heater, when there is no chilled water load and hot water only operation is performed, the valves a, c, d, and e are closed and the valves b and g are opened. Further, the present invention can be applied not only to a water-cooled type using cooling water for cooling the absorber and the condenser (illustration), but also to an air-cooled type using cooling air (not shown).

[0011]

As described above, in the present invention, since the refrigerant vapor is shut off after liquefaction via the heating side of the low-temperature regenerator and the valve a is provided, the valve can be installed at a place where the pipe diameter is small. At the same time, a pipe is provided to return the refrigerant liquid to the high-temperature regenerator. Can be avoided.

[Brief description of the drawings]

FIG. 1 is a flowchart of a double-effect absorption chiller / heater of the present invention.

FIG. 2 is another flow chart of the double effect absorption chiller / heater of the present invention.

FIG. 3 is a flowchart of a conventional double effect absorption chiller / heater.

[Explanation of symbols]

1 to 11: solution pipeline, 12, 13, 15 to 19, 21,
23, 25: refrigerant pipe, 14: heating pipe, 20: refrigerant branch point, 22: heating side, 24: bypass branch point, 26: cooling water pipe, 27: cooling water pipe, 28: cold water pipe, 29: heating pipe,
30: heat source calorie control valve, 31, 32: temperature detector, A:
Absorber, E: Evaporator, GH: High temperature regenerator, GL: Low temperature regenerator, C: Condenser, W: Hot water heater, XH: High temperature heat exchanger, XL: Low temperature heat exchanger, PS: Solution pump, PM: refrigerant pump, a, b, c, d: switching valve, e, f, g: regulating valve

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-6-347122 (JP, A) JP-A-53-15655 (JP, A) JP-A-62-218771 (JP, A) JP-A 54-1984 34162 (JP, A) (58) Field surveyed (Int. Cl. ⁷ , DB name) F25B 15/00 303

Claims (4)

(57) [Claims] 1. An absorber, an evaporator, a high temperature regenerator, a low temperature regenerator, a condenser, a high temperature solution heat exchanger, a low temperature solution heat exchanger, a hot water heater, a solution pump, and a solution path connecting these devices A refrigerant path, and the refrigerant path is a refrigeration cycle system refrigerant from a condenser to an evaporator via a heating side of a low-temperature regenerator, from a refrigerant branch point for dividing refrigerant vapor generated from a high-temperature regenerator. In the double-effect absorption chiller / heater, which is a hot water cycle system refrigerant path to the high temperature regenerator via the heating side of the hot water heater and the other side, the heating side of the low temperature regenerator in the refrigeration cycle system refrigerant path A valve a is provided in the refrigerant pipe that has exited the outlet, and a refrigerant pipe provided with a valve b that is directed to the high-temperature regenerator is connected to the refrigerant pipe between the heating-side outlet of the low-temperature regenerator and the valve a. Hot water
A refrigerant distribution having a valve e connecting a heater and a condenser or an evaporator.
Characterized Rutotomoni, a solution pipe from the solution pump outlet of the solution route to the high temperature regenerator inlet, to a solution piping from the high-temperature regenerator outlet to the absorber, respectively valves c, and providing the d provided tube And a double-effect absorption chiller / heater. 2. The double effect absorption chiller / heater according to claim 1, wherein the valve a and the valve b are integrated into a three-way valve. 3. The absorption chiller / heater according to claim 1, wherein the valve a, the valve c, and the valve d are closed and the valve b is opened during a dedicated hot water operation. Heavy duty absorption chiller / heater 4. A said absorption chiller, during hot exclusive operation, valves a, claim, characterized in that the valve c, and valves d and valve e closure and configured to open the valve b 1 or 2
The dual-effect absorption chiller / heater as described.