JPH0552438A - Absorption heat pump - Google Patents

Abstract

PURPOSE:To form an absorption heat pump in a compact manner and to improve a result factor by a method wherein heat is inputted from sewage treating water in a first vaporizer and heat is emitted to the intermediate hot water side through a double effect absorption heat pump cycle, and inputted to a second vaporizer. CONSTITUTION:Dilute liquid in a first absorber 4a is mixed in dilute liquid in a second absorber 4b through a low-temperature heat-exchanger 5b, and the mixture flows through an intermediate temperature heat-exchanger 5c, a low-temperature regenerator 1b, and a high-temperature heat-exchanger 5a to a high-temperature regenerator 1a. A part of concentrated liquid in the high- temperature regenerator 1a reversely flows through the high temperature heat- exchanger 5a and the intermediate temperature heat-exchanger 5c to the second absorber 4b, and the rest reversely flows through the low-temperature heat- exchanger 5b to the first absorber 4a. A part of refrigerant steam generated in the high-temperature regenerator 1a flows through the low-temperature regenerator 1b and a first condenser 2a to a first vaporizer 3a and the rest flows through a second condenser 2b to a second condenser 3b. This constitution saves a space and takes out high temperature water with high efficiency.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an absorption heat pump used for heating operation and the like.

[0002]

2. Description of the Related Art Conventionally, as this type of heat pump device, for example, a device proposed in Japanese Patent Laid-Open No. 58-60172 is known. The heat pump device proposed here is one in which two independent cycles are connected through a heating medium by combining two single-effect devices, and it is difficult to make the entire device large and compact. There was a problem.

Further, the coefficient of performance of the apparatus (hereinafter referred to as COP) is not always satisfactory. That is, since the COP of a single-effect heat pump is generally around 0.5, the heating amount Q in the regenerator of the first absorption refrigerator is
_{When G1} is 1, the heat quantity Q _E1 in the evaporator is 0.5,
The amount of heat radiation Q _AC1 to the hot water system is the sum of Q _G1 and Q _E1 and _therefore Q _AC1 = Q _G1 + Q _E1 = 1 + 0.5 = 1.5. Since the heat quantity of Q _AC1 becomes the heat quantity of the evaporator of the second absorption refrigerator, the heating quantity Q _G2 in the regenerator of the second absorption refrigerator is Q _G2 = 1.5 ÷ 0.5 = It becomes 3.0. Therefore, the heat radiation amount Q _AC2 to the hot water system in the second absorption refrigerator is Q _AC2 = Q _AC1 + Q _G2 = 1.5 + 3.0 = 4.5, and the COP of the entire device (hot water system) is COP. = Q _AC2 ÷ (Q _G1 + Q _G2 ) = 4.5 ÷ (1.0 + 3.0) = 1.125, which is low, and improvement in this point has also been demanded.

[0004]

Therefore, the present invention aims at downsizing of the absorption heat pump, and at the same time, COP
It is intended to improve.

[0005]

The present invention has been made in order to solve the above-mentioned problems of the prior art. A high temperature regenerator, a low temperature regenerator, a first condenser, a second condenser, a first evaporator, It consists of a second evaporator, a first absorber, a second absorber, a high temperature heat exchanger, a medium temperature heat exchanger and a low temperature heat exchanger. After being mixed with the dilute liquid from the second absorber, it flows into the low temperature regenerator through the medium temperature heat exchanger, then flows into the high temperature regenerator through the high temperature heat exchanger, and the refrigerant is evaporated and separated to be concentrated. The concentrated liquid passes through the high-temperature heat exchanger and the medium-temperature heat exchanger so that part of the concentrated liquid can flow back to the second absorber, and the rest can flow back to the first absorber via the low-temperature heat exchanger. Part of the refrigerant vapor that has flowed into the first condenser through the low temperature regenerator and then into the first evaporator,
The remaining part of the generated refrigerant vapor is allowed to directly flow into the second condenser, and then is allowed to flow into the second evaporator. It is possible to circulate the intermediate hot water pipe in the order of the first absorber, the first condenser and the second evaporator, and the high temperature water is supplied from the high temperature water pipe provided in the order of the second absorber and the second condenser. It is an absorption heat pump characterized by taking out, between the refrigerant line from the second condenser to the second evaporator, and the intermediate hot water pipe from the first condenser to the second evaporator, the refrigerant intermediate hot water An absorption heat pump provided with a heat exchanger, a refrigerant line from the second condenser to the second evaporator, and an absorption liquid provided so that a part of the dilute liquid can directly flow from the first absorber to the low temperature regenerator. It is an absorption heat pump having a drain heat exchanger provided between the pipe and the pipe.

[0006]

In the absorption heat pump according to the first aspect, the dilute liquids from the first and second absorbers having different temperatures and pressure levels are mixed and then introduced into the low temperature regenerator and the high temperature regenerator, The refrigerant vapor is generated, separated and concentrated, and the concentrated liquid from the high temperature regenerator flows into the first absorber and the second absorber at a predetermined ratio. Further, the refrigerant evaporated and separated by the high temperature regenerator is guided to the first condenser via the second condenser and the low temperature regenerator, and then flows into the second evaporator and the first evaporator, respectively. In this way, a double-effect absorption heat pump is formed by the first evaporator, the first absorber, the first condenser, the low temperature regenerator, and the high temperature regenerator, and the second evaporator, the second absorber, and the second condenser. Since the single-effect absorption heat pump is formed by the reactor and high-temperature regenerator, the heat input from the sewage treatment water in the first evaporator is radiated to the intermediate hot water side by the double-effect absorption heat pump cycle, and this is By inputting heat to the evaporator, high-temperature water can be efficiently supplied from the high-temperature water pipe line that connects the second absorber and the second condenser in this order.

In the absorption heat pump according to the second aspect, the refrigerant flowing from the second condenser to the second evaporator is cooled by exchanging heat with the intermediate hot water in the refrigerant intermediate hot water heat exchanger and cooled in the second evaporator. Since the amount of heat required for vaporizing is increased, the amount of heat generated in the adjacent second absorber via the eliminator is increased, and the hot water flowing through the hot water pipeline is efficiently heated.

In the absorption heat pump according to the third aspect of the present invention, a part of the dilute liquid that directly flows from the first absorber to the low temperature regenerator is heated by the high temperature refrigerant in the drain heat exchanger, and the low temperature regenerator (and the high temperature regenerator). The efficiency of evaporating and separating the refrigerant is improved, and the refrigerant flowing from the second condenser to the second evaporator is deprived of heat and its temperature is lowered. Since the amount of self-flash required for descending is reduced, the effective use of the refrigerant is promoted, and the hot water flowing through the hot water pipeline is effectively heated.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In the figure, 1a is a high temperature regenerator, 1b is a low temperature regenerator,
2a is a first condenser, 2b is a second condenser, 3a is a first evaporator, 3b is a second evaporator, 4a is a first absorber, 4b is a second absorber, 5a is a high temperature heat exchanger, 5b. Is a low temperature heat exchanger, which is not different from the conventionally known one, and is connected by piping as described below, unless otherwise specified,
Like the conventional system, all devices are connected so that they can function smoothly.

(Example 1) In the absorption heat pump shown in FIG. 1, the dilute liquid of the first absorber 4a is a low temperature heat exchanger 5
After passing through b, it is mixed with the dilute liquid from the second absorber 4b, flows into the low temperature regenerator 1b via the medium temperature heat exchanger 5c, flows into the high temperature regenerator 1a via the high temperature heat exchanger 5a, and evaporates the refrigerant. The concentrated liquid produced by the separation can be returned to the second absorber 4b through the high temperature heat exchanger 5a and the intermediate temperature heat exchanger 5c, and the rest to the first absorber 4a through the low temperature heat exchanger 5b. The absorbing liquid pipe 6 is connected by piping. P1, P2, and P3 are pumps for circulating the absorbing liquid, which are installed at respective positions of the absorbing liquid pipe 6.

A part of the refrigerant vapor generated and separated in the high temperature regenerator 1a passes through the low temperature regenerator 1b, and then the first condenser 2a.
Is connected to the first evaporator 3a and the rest of the generated refrigerant vapor directly flows into the second condenser 2b and then into the second evaporator 3b. Has been done.

Then, the intermediate hot water pipe line 8 is connected to the first absorber 4
a, the first condenser 2a, and the second evaporator 3b are circulatively connected in a circulatory manner, and the cold water pipe 9 guides sewage treatment water, river water, etc. into the first evaporator 3a, and then sewage, river, etc. It is piped for drainage. P4 is a pump provided in the intermediate hot water pipe line 8.

Further, a high temperature water pipe 10 is arranged in the order of the second absorber 4b and the second condenser 2b, and when the concentrated liquid supplied from the high temperature regenerator 1a absorbs the refrigerant in the second absorber 4b. It is possible to take out high-temperature water (for example, 80 ° C.) from the discharge side of the high-temperature water pipe 10 because it is heated by the heat generated and in the second condenser 2b by the high-temperature refrigerant vapor supplied from the high-temperature regenerator 1a. Has become.

By distributing the refrigerant and the concentrated liquid generated in the high temperature regenerator 1a, a single effect heat pump and a double effect heat pump are formed. Generally, the double-effect heat pump has an intermediate hot water side COP; 2.0 〃 heat source water side COP; 1.0, a single effect heat pump hot water side COP; 1.5 〃 intermediate hot water side COP; If the heat input to the high temperature regenerator on the utility side is 1, the heat output to the intermediate water side is 2.0. Since this is input as heat source water on the single-effect side, the heat input to the high-temperature regenerator on the single-effect side is 2.0 ÷ 0.5 = 4.0. Therefore,
The COP of the entire system is COP = 4.0 × 1.5 ÷ (1 + 4.0) = 1.2, which is the COP (1.12) of the conventional absorption heat pump.
From 5), it can be seen that an improvement of about 7% (1.2 ÷ 1.125≈1.07) was achieved.

In addition, Q_E1The amount of heat exchanged in the first evaporator 3a Q_E2The amount of heat exchanged in the second evaporator 3b N₁ The refrigerant evaporation amount N in the first evaporator 3a₂ The refrigerant evaporation amount G in the second evaporator 3b_TenThe amount of rare liquid flowing out from the first absorber 4a (concentration 58
%) G₂₀The amount of rare liquid flowing out from the second absorber 4b (concentration 60
%) G₁₁The amount of concentrated liquid flowing into the first absorber 4a (concentration 63.5
%) G_{twenty one}The amount of concentrated liquid flowing into the second absorber 4b (concentration 63.5
%), G_Ten× 0.58 = G₁₁× 0.635 G₂₀× 0.60 = G_{twenty one}× 0.635 N₁ = G_Ten-G₁₁  N₂ = G₂₀-G_{twenty one}  N₁ : N₂ ≒ Q_E1: Q_E2= 1: 2.0, G_{twenty one}/ G₁₁= 3.28 Therefore, the concentrated liquid from the high temperature regenerator 1a is the first absorber 4
a and the second absorber 4b are distributed at a ratio of 1: 3.28.
Flows in.

In addition, N_LGThe amount of refrigerant generated in the low temperature regenerator 1b n_C1Is guided to the first condenser 2a via the low temperature regenerator 1b
Refrigerant vapor amount n_C2The amount of refrigerant vapor introduced to the second condenser 2b is N_LG+ N_C1= N₁ n_C2= N₂ N_LG= 4/6 × n_C1  From the relationship, N₁ : N₂ = 10/6 × n_C1: N_C2= 1: 2.0 ∴n_C1/ N_C2= 3/10 Therefore, the refrigerant (steam) generated in the high temperature regenerator 1a is
The low temperature regenerator 1b and the second condenser 2b are divided at a ratio of 3:10.
It is distributed and flows in.

Incidentally, from the second condenser 2b to the second evaporator 3b.
To the refrigerant pipe 7 and the first condenser 2a to the second evaporator 3
It is also possible to provide a refrigerant intermediate hot water heat exchanger 5d between the intermediate hot water pipe line 8 reaching b, and in the absorption heat pump having such a configuration, from the second condenser 2b to the second evaporator 3b. The inflowing refrigerant is cooled by exchanging heat with the intermediate hot water in the refrigerant intermediate hot water heat exchanger 5d, and the amount of self-flash required for the temperature drop of the refrigerant is reduced, so that the effective use of the refrigerant is promoted, and the high temperature water pipeline 10 The hot water flowing through is efficiently heated.

(Embodiment 2) FIG. 2 shows a refrigerant line 7 from the second condenser 2b to the second evaporator 3b of the absorption heat pump shown in FIG. Before the low-temperature heat exchanger 5b of the absorption liquid pipe 6 which is being sent to the low-temperature regenerator 1b via the exchanger 5b and the medium-temperature heat exchanger 5c, is branched and a part of the dilute liquid is directly supplied to the low-temperature regenerator 1b. This is an example in which the drain heat exchanger 5e is provided between the dilute liquid branch pipe line 61 provided so as to be able to flow in.

In this absorption heat pump, the dilute liquid flowing into the low temperature regenerator 1b through the dilute liquid branch pipe line 61 is heated by the high temperature refrigerant in the drain heat exchanger 5e,
Since the temperature of the refrigerant flows into the low temperature regenerator 1b (and the high temperature regenerator 1a) at a high temperature, the efficiency of evaporating and separating the refrigerant is improved, and the refrigerant flowing from the second condenser 2b to the second evaporator 3b conversely generates heat. The temperature of the refrigerant is deprived of the refrigerant, and the amount of self-flash required for the temperature of the refrigerant to decrease is reduced. Therefore, the effective use of the refrigerant is promoted, and the hot water flowing through the high temperature water conduit 10 is effectively heated.

The refrigerant intermediate hot water heat exchanger 5d,
It is also possible to attach the drain heat exchanger 5e at the same time.

[0021]

As described above, the absorption heat pump of the present invention is a combination of the conventional devices having only two single-effect devices combined into a single device, thus saving a large amount of space. Can be achieved. In addition, since it is a combination of a double-effect cycle and a single-effect cycle, COP is improved by about 7% compared to the conventional device, river water of about 12 ° C is used as a low-temperature heat source, and high-temperature water of about 80 ° C is used. It can be taken out efficiently.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of a first embodiment.

FIG. 2 is an explanatory diagram of a second embodiment.

[Explanation of symbols]

 1a high temperature regenerator 1b low temperature regenerator 2a first condenser 2b second condenser 3a first evaporator 3b second evaporator 4a first absorber 4b second absorber 5a high temperature heat exchanger 5b low temperature heat exchanger 5c middle Heat exchanger 5d Refrigerant intermediate hot water heat exchanger 5e Drain heat exchanger 6 Absorbing liquid conduit 7 Refrigerant conduit 8 Intermediate hot water conduit 9 Cold water conduit 10 High temperature water conduit P1 pump P2 pump P3 pump P4 pump

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Tomoyuki Murayama 2-18 Keihan Hondori, Moriguchi City, Osaka Sanyo Electric Co., Ltd. (72) Inventor Yotaro Kagawa 2-18 Keihan Hondori, Moriguchi City, Osaka Sanyo Denki Within the corporation

Claims (3)

[Claims] 1. A high temperature regenerator, a low temperature regenerator, a first condenser,
It consists of a second condenser, a first evaporator, a second evaporator, a first absorber, a second absorber, a high temperature heat exchanger, a medium temperature heat exchanger and a low temperature heat exchanger. The dilute liquid of the absorber passes through the low temperature heat exchanger, is mixed with the dilute liquid from the second absorber, flows into the low temperature regenerator through the medium temperature heat exchanger, and then flows into the high temperature regenerator through the high temperature heat exchanger. The concentrated liquid obtained by evaporating and separating the refrigerant is provided so that it can be returned to the first absorber via the high-temperature heat exchanger and the medium-temperature heat exchanger, part of which is in the second absorber, and the remainder is in the low-temperature heat exchanger. , A part of the refrigerant vapor generated in the high-temperature regenerator through the refrigerant pipe flows into the first condenser after passing through the low-temperature regenerator, and then flows into the first evaporator, while the remaining part of the generated refrigerant vapor is directly condensed into the second condenser. It is installed so that it can flow into the second evaporator after it has flowed into the reactor, and the sewage treatment water, river water, etc. pass through the first evaporator to the sewage, river It can be drained to the middle hot water pipeline, and the first absorber, the first condenser, and the second evaporator can be circulated in that order. An absorption heat pump that takes out high-temperature water. 2. A refrigerant intermediate hot water heat exchanger is provided between the refrigerant conduit from the second condenser to the second evaporator and the intermediate hot water conduit from the first condenser to the second evaporator. The absorption heat pump according to claim 1. 3. A refrigerant line from the second condenser to the second evaporator, and an absorption liquid line provided so that a part of the dilute liquid can directly flow from the first absorber to the low temperature regenerator. The absorption heat pump according to claim 1, further comprising a drain heat exchanger.