JPS6138368A - Heat pump system - 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 [Technical Field of the Invention] The present invention relates to a pump system used in a near conditioner or the like.

[Note ↓ is also an acknowledgment of the technical past and time.] As a conventional heat pump system of this type, there is, for example, the one shown in FIG. 4. This heat pump system has a compression 1101, a condenser 1 as a heat exchanger on the radiation side.
03. In addition to having an evaporator 105 as an endothermic side heat exchanger and an expansion valve 107, as a low-temperature heat source, for example, a waste heat tank 109 that accommodates factory waste water used as cooling water,
The evaporator 105 is provided with an external heat exchanger 111 that performs heat exchange such that the cooling water from the waste heat tank 109 is guided by a pump 113 and used as an external heat source for the evaporator 105.

The refrigerant compressed by the compressor 101 is condensed and liquefied in the condenser 103 and radiates heat to the outside. Comes with an expansion valve 10.
7, is evaporated in an evaporator 105, absorbs heat from the outside, and is returned to the compressor 101. Therefore, heat absorbed from the outside by the evaporator 105 can be radiated to the outside by the condenser 103. On the other hand, when absorbing heat in the evaporator 105, the cooling water in the exhaust heat tank 109 guided by the drive of the pump 113 becomes an external heat source, and the external heat exchanger 1
In No. 11, -C heat exchange is performed and waste heat is utilized. Therefore, the evaporation pressure of the evaporator 105 can be avoided, and the coefficient of performance of the heat pump system can be improved.

However, in this type of equipment, the sensible heat of water with low heat storage density, such as factory wastewater used as cooling water, is directly used as an external heat source, so the temperature as an external heat source is not stable, and it is difficult to maintain a stable temperature. There was a risk that it would be difficult to improve the coefficient of performance.

[Purpose of the invention]

This invention was made in view of the above problems.
The purpose is to provide a companion to a heat pump system that can stably improve the coefficient of performance while using low-temperature heat sources such as heat.

[Summary of the invention]

In order to achieve the above object, the present invention provides a heating device using a low-temperature heat source in a heat pump system in which heat is absorbed from the outside by an endothermic side heat exchanger and heat is radiated to the outside by a radiating side heat exchanger. A heat storage tank that houses a heat storage material that can generate heat by separating a working medium through heating by the heating device and generating heat by operating the separated working medium; and the heat storage material that generates heat serves as an external heat source for the endothermic side heat exchanger. The structure includes an external heat exchanger that performs heat exchange in this manner, and a storage tank that stores the working medium and can discharge the working medium to the heat storage tank side so as to selectively act on the heat storage material.

[Embodiments of the invention]

Hereinafter, one embodiment of the present invention will be described in detail based on FIGS. 1 to 3.

FIG. 1 is a conceptual diagram of a heat pump system according to an embodiment of the present invention. This heat pump system is the fourth
As in the case shown in the figure, in addition to the compressor 1, condenser 3, evaporator 5, and expansion valve 7, a heat storage device 9 is also provided.

This heat storage device 9 has a heating device 11, a heat storage tank 13, and a storage tank 15. The heating device 11 utilizes waste heat as a low-temperature heat source, and includes a waste heat tank 17 and a first heating heat exchanger 19 that accommodate factory wastewater used as cooling water.
, and a second heating heat exchanger 21. The first heating heat exchanger 19 is located inside the heat storage tank 13, is connected to the 1j1 heat tank 17, and is connected to the first pump 2.
They are connected by a first heating circulation path 25 with a heating circuit 3 interposed therebetween.

The second heating exchanger 21 faces into the storage tank 15, and has one end connected to the first heating circuit 25 via an H-plane switching valve 27 and the other end of the second heating circuit 25. It is connected to the.

In the heat storage tank 13, an absorption liquid as an example of a heat storage material,
For example, 11[3γ aqueous solution (lithium bromide aqueous solution)
or is contained. This LiBγ aqueous solution is heated by the heating device 11.
By heating, negative water vapor is separated as a working medium, and the separated water vapor acts on the +*Bγ aqueous solution again, in other words, is absorbed, thereby generating heat. A partition plate 31 is provided above the heat storage tank 13, and a spray device 33 is arranged on the partition plate 31. And this spray device 33 is the second pump 3
The heat storage tank 13 is communicated with the bottom tank portion of the heat storage tank 13 through a first communication path 37 with a pipe 5 interposed therebetween.

The storage tank 15 is communicated with the heat storage tank 13 via a second communication path 39 at a position facing the spray device 33 . Therefore, the storage tank 15 is configured to store steam as the working medium and to discharge the steam to the heat storage tank 13 side so that the steam can selectively act on the LIBγ aqueous solution. Further, a cooling heat exchanger 41 is faced to the upper tank part of the storage tank 15, and this cooling heat exchanger 41 is connected to the third pump 4.
5 is connected to a cooling tower 47 using, for example, -C water as a refrigerant.

On the other hand, an external heat exchanger 49 is arranged on the evaporator 5 side,
This external heat exchanger 49 had a fourth pump 51 interposed therein. It is connected to the inside of the partition plate 31 of the heat storage tank 13 and the bottom tank portion via a heat radiation circulation path 53. Therefore, the external heat exchanger 49 is configured to perform heat exchange so that the generated IBγ aqueous solution becomes an external heat source for the evaporator 5.

Next, the operation of the above embodiment will be described.

First, in the heat storage process of the heat storage device 9, the first bomb 23
and the third pump 45 are driven, and by driving the first boss 23, the cooling water in the waste heat tank 17 is pumped to the first pump as shown by the solid line arrow.
Pump 23, first heating circulation path 25, first heating heat exchanger 1
9 and the first heating circulation path 25, and is returned to the waste heat tank 17.

In the first heating heat exchanger 19, heat exchange is performed to heat the LiBγ aqueous solution using the cooling water as a heat source, and as a result of this heating, water vapor is generated from the LiBγ aqueous solution.
L, LiBγ aqueous solution is concentrated. The water vapor generated from the 18γ aqueous solution is transferred to the storage tank 15 through the 231st passage 39.
be accommodated in.

On the other hand, by driving the third pump 45, the cooling tower 47, the cooling circuit 43, the cooling heat exchanger 41, the cooling circuit 43. Water as a refrigerant is circulated through the cooling tower 47 and the cooling tower 47 in this order. Heat exchange is performed by the water cooled by the cooling tower 47 so as to cool the steam in the cooling heat exchanger 41 and the R storage tank 15 . By this cooling, the water vapor in the storage tank 15 is condensed and liquefied, and stored in the bottom tank.

Next, when the heat pump system enters operation, the third
While the pump 45 is stopped, the directional switching valve 27 is switched, and the second pump 35 and the fourth pump 51 are driven. Then, by switching the directional control valve 27,
The cooling water in the waste heat tank 17 flows toward the second heating circulation path 29 as indicated by the broken line arrow, and is circulated to the second heating heat exchanger 21 .

Then, heat exchange is performed in the second heating heat exchanger 21 to heat the water in the storage tank 15, and the water vapor generated by this heating is returned to the heat storage tank 13 through the three second communication passages. . On the other hand, by driving the second pump 35, the concentrated LiBγ aqueous solution in the heat storage tank 13 is sprayed from the spray device 33 onto the division screen 31 via the first communication path 37, and this sprayed LiBγ aqueous solution is absorbs the water vapor reduced in the heat storage tank 13 and generates heat,
It is stored on section 31. The IBγ aqueous solution stored on the partition screen 31 is circulated and supplied to the external heat exchanger 49 via the heat radiation circuit 53 by driving the fourth pump 51, and is returned to the heat storage tank 13. (External heat exchanger 4
At step 9, heat exchange is performed so that the exothermic IBT water bath liquid is used as an external heat source for the evaporator 5.

On the other hand, the refrigerant compressed by the compressor 1 is sent to the condenser 3 d3.
The refrigerant is condensed and liquefied and radiates heat to the outside, and expansion is performed in the expansion valve 7.The expanded refrigerant is evaporated in the evaporator 5, absorbs heat through heat exchange with the external heat exchanger 49, and is compressed. Therefore, the evaporation pressure flowing into the evaporator 5 can be increased, and the pressure difference between the condensing type 3 and the evaporator 5 can be reduced. Therefore, the coefficient of performance of the heat pump system can be improved. J-, the cooling water in the waste heat tank 17 is directly transferred to the evaporator 5.
615 heat source and 7-, but once the heat storage device 9
Since heat is stored in the evaporator and used as an external heat source for the evaporator 5, it is possible to stably improve the coefficient of performance with little change in temperature of the external heat source.

Next, improvement in the coefficient of performance of the heat pump system according to this embodiment will be specifically described.

FIG. 2 shows the temperature increase effect during the heat dissipation process in the heat storage device 9. The horizontal axis shows the temperature Tab of the LiBγ aqueous solution, and the vertical axis shows the vapor pressure pv and temperature TV of water.
The parameter is the concentration of the IBγ aqueous solution, for example, ξ=0.35.45%. 9. Let the temperature of the cooling water in the exhaust heat tank 17 be 1-o=40'c, and consider a summer dry bulb temperature of 35°C and a wet bulb temperature of 24°C as outside air conditions. First, in heat storage process C, since the heating temperature of the LiBγ aqueous solution is PO = 40°C, Ta
b=40°C, and at the same time, the cooling water temperature of the cooling tower 47 becomes TV=2A°C in accordance with the wet bulb temperature of 24°C, so the vapor pressure becomes Pv-24mm1-IQ.

Therefore, the water vapor is concentrated and liquefied and stored in the storage tank 15, and the concentration of the LiBγ aqueous solution is ξ−35%.
to ξ-45%.

On the other hand, in the heat dissipation process, when the water in the storage tank 15 is heated at To=40°C, the temperature of the water becomes 4iTV=40°C, so the vapor pressure becomes pv=55111 mH (l. Therefore, the storage tank 1
The water vapor in 5 is returned to the heat storage tank 13 side and concentrated L
The i8γ aqueous solution absorbs water vapor from ξ=45% to ξ−35%, and the LiBγ aqueous solution absorbs water vapor from T ab=48°
I feel thirsty up to C. Similarly, in winter, with a dry bulb temperature of 7°C and a wet bulb humidity of 6°C, To = 40°C and T ab = 60°C.
It is possible to raise the temperature to .

FIG. 3 shows the coefficient of performance COP' of the heat pump system according to this embodiment and the LI which is the external heat source of the evaporator 5.
The relationship between the absorption temperature T'ab of the Bγ aqueous solution is shown, and as mentioned above, since T ab = 48°C in summer, C0P =
3.3'5, and in winter T ab -60℃, so C
0P=4.85, making it possible to improve the coefficient of performance. Next, the heat storage density in the heat storage device 9 will be compared with the heat storage density of a conventional device that directly utilizes the sensible heat of water. In other words, the heat storage tank of the heat storage device 9 is Ql (kcal)
, specific gravity fi17e of Li B7 aqueous solution (kq/m
3), same volume IV+(=3), absorbed heat Δl-1(kc
al/k(1), concentration difference Δξ of L i B 7 aqueous solution
Then, Q1=γe−Vl·ΔH−Δξ, and the heat storage density of the heat storage device 9 is given by the following equation.

Ql/V+ -γe ・ΔH・△ξ And if it is △ξ-10% in summer as shown in Figure 2, L
i 78 of B7 aqueous solution = 1.6x103 kg/m
3. Since Δt-1=600kcal/kg, Q+ /
V+ =9.5x 104kcal/m3.

On the other hand, the heat storage density when using the sensible heat of water is the specific gravity of water 17w (k (1/m 3 ), the same specific heat CW kca
l/k (1℃, temperature change due to sensible heat △Tw (de
g), assuming the same volume V2 (III"), it becomes Q2/V2-γw-Cw・△TW.Here, in order to make the conditions approximately the same, the temperature increase width of the LiBγ aqueous solution in summer is approximately the same ( Then ΔTw =
If I QaeQ, γ-I X 103 kg/m 3 , CW = 1 k
cal/kg℃, so Q2/V2 = 10'kcal/m''t. Therefore, when comparing Q+/V+ and Q2/V2, there is about 10 times more openness, and the sensible heat of the water is directly transferred to the outside. It is possible to improve the coefficient of performance more stably than when using it as a heat source.

a3 This invention is not limited to the above embodiment. For example, in the above embodiment, an IBγ aqueous solution was used as the absorption liquid, but other absorption liquids may be used. Furthermore, the heat storage device M9 is not limited to the heat absorption type as in the above-mentioned embodiment, but the same effect can be obtained by using other heat storage means such as an adsorption heat type or a reaction heat type. Further, as the low-temperature heat source accommodated in the waste heat tank 17, underground water or the like can also be used.

(Effect of the invention) As is clear from the above, depending on the structure of this invention, JJ
While using low-temperature heat sources such as F heat, it is possible to stably improve the coefficient of performance by using it as an external heat source for the heat exchanger on the heat radiation side via a heat storage shrine with a higher heat storage density than water. .

[Brief explanation of drawings]

Fig. 1 is a conceptual diagram of a heat pump system according to an embodiment of the present invention, Fig. 2 is a relational diagram showing the temperature raising effect of the heat storage device, Fig. 3 is a relational diagram between the coefficient of performance and the absorption liquid temperature, FIG. 4 is a conceptual diagram of a conventional nitrogen pump system. 3... Condenser (heat exchanger on the heat radiation side) 5... Evaporator (heat exchanger on the heat absorption side) 11... Heating device 13... Heat storage tank 15...
・Storage tank No. 3 Figure 4 Procedural amendment (7'56゛) Date of December 8, 1981 Manabu Shiga, Director General of the Tokusatsu Agency 1, Indication of matter A'1 Showa! 2 years Patent Application No. 1 L Near-2og No. 28 Name of Invention He [Men V0;/Surm 3, Relationship with the Amendment Person Case Patent Applicant Address (Residence) Sho Shiite! 11 prefecture meter nail width ♀ ward boundary 111 group 1
72 Anfu L Name (Name) (30'f) Co., Ltd. Net Contents - I Bomote Ne' II Shiki Tadashi - 4, Agent Address 1-2-3 Toranomon, Minato-ku, Tokyo 105
No. Toranomon No. 5th floor, Building 6 Neyama Masashi σ) Bun T elephant (1) 1 Ya Nago' Shichisho 19 people Ihe Okojin's ↑ Kato hit θ
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・1 Itoran and Otsu (Inner wall has a 4th needle on the Buddha's heart document. 1st page 1st page)
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Claims (1)

[Claims] In a heat pump system in which heat is absorbed from the outside by the heat exchanger on the heat absorption side and heat is radiated to the outside by the heat exchanger on the heat radiation side, there is a heating device that uses a low-temperature heat source, and a working medium is separated and separated by the heating by this heating device. a heat storage tank that accommodates a heat storage material that can generate heat by the action of a working medium; an external heat exchanger that performs heat exchange so that the heat storage material that generates heat is used as an external heat source of the endothermic side heat exchanger;
A heat pump system comprising a storage tank that stores the working medium and can discharge the working medium to the heat storage tank side so that the working medium selectively acts on the heat storage material.