JPH0526480A - District heat source system - Google Patents

Abstract

PURPOSE:To decrease times of starts and stops or eliminate start and stop of a lump heat source so that heat source instruments can be driven efficiently by providing an auxiliary heat source in some set demanding parts of a plurality of demanding parts within a district to which heat is distributed and supplied from the lump heat source. CONSTITUTION:Demanding parts A1 to An, accumulating cold or heat in a heat accumulating tank 2 and an auxiliary heat accumulating tank 3, can be turned over between cooling state and heating state. Each of the demanding parts A1 to An forms a demanding part A which is provided with an auxiliary refrigerator 4. Capacity of the auxiliary refrigerator 4 is so set as to be able to respond to a peak load RP of each of the demanding parts A1 to An. If a peak of heat load of the demanding parts A1 to An is cut by this auxiliary heat source, the maximum of a total heat load can be reduced. If the capacity of the auxiliary heat source is selected corresponding to the heat load or the like, irrespective of variations of the total heat load, a lump heat source B can be driven continuously with a constant capacity, whereby times of starts and stops can be reduced or start and stop itself can be eliminated. Further, the capacity of the lump heat source B can be minimized.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention is applicable to offill buildings, hospitals,
A region where multiple buildings such as hotels exist is defined as
A district heating / cooling system and a district heating / cooling hot water supply system that perform heating / cooling and heating / cooling hot water supply for those buildings with a single heat source. Specifically, a district heat source that provides a collective heat source to distribute heat to a plurality of demand / department units in the area Regarding the system.

[0002]

2. Description of the Related Art As a conventional district heat source system, there is known a system in which only a collective heat source is provided to perform cooling, heating and hot water supply. (For example, JP-A-49-3
7455, JP-A-49-37456).

[0003]

However, the conventional technique described above has the following drawbacks because it uses only a collective heat source. The maximum value of heat load such as cooling load and heating load of each demand part, the change of one day and night, and the change over the year vary depending on the demand part, and generally, the peak time of the heat load of each demand part is shifted. , As the capacity required for the collective heat source, it is enough to deal with a heat load smaller than the heat load obtained by adding the peak heat load of each demand part, but
In order to reliably deal with the heat load in each demand part, a large heat source is required as a collective heat source. Moreover, it is almost impossible, rather than very difficult, to accurately predict the heat load in each demanding part such as a building in advance. Therefore, in general, a large design load is required to prevent insufficient capacity. It is necessary to estimate and provide a collective heat source with sufficient capacity. In short, the conventional technology requires a large-capacity collective heat source. On the other hand, the frequency at which the total heat load including the heat load of each demand section becomes maximum is very low, such as several hours at most for several tens of hours a year, and in most cases the total heat load is 35% of the design load. It is the following. Therefore, according to the conventional technique, the capacity of the collective heat source becomes excessive in most of the operations, and since the capacity is large, the collective heat source whose start-up is bad is frequently started and stopped, and the efficiency is very poor. Further, as seen in the above-mentioned publication, the demand section is provided with a heat storage tank for storing the heat supplied from the collective heat source.For example, in cooling, cold heat is accumulated by operating the collective heat source at night when the cooling load is small. There is a system that reduces the capacity of the collective heat source by supplementing the cooling by the operation of the collective heat source with the stored cold heat during the daytime when the cooling load is large, etc. However, since the capacity of the collective heat source can be reduced compared to the one without a heat storage tank, it is absolutely necessary to have a large capacity as a collective heat source. There were many departures and departures, and efficiency was poor. An object of the present invention is to provide a district heat source system capable of significantly reducing or eliminating the start and stop of a collective heat source for coping with heat load.

[0004]

A first characteristic configuration of the district heat source system according to the present invention is that an auxiliary heat source is provided in a set demand part among the demand parts. A second characteristic configuration of the district heat source system according to the present invention is that, in the first characteristic configuration, a heat storage tank that stores heat supplied from the collective heat source is provided in the demand / supply unit. A third characteristic configuration of the district heat source system according to the present invention is the first or second characteristic configuration according to the first or second characteristic configuration, wherein the demand / supply section including the auxiliary heat source is provided with an auxiliary heat storage tank for storing heat from the auxiliary heat source. In point. In the third characteristic configuration, it is preferable that the auxiliary heat source be provided with electric power as a drive source.

[0005]

According to the first characteristic configuration, since the auxiliary heat source is provided so as to bear a part of the heat load, the auxiliary heat source cuts the peak of the heat load of the demand and supply portion to obtain the total heat. Not only can the maximum value of the load be reduced, but by selecting the capacity of the auxiliary heat source according to the heat load, the batch heat source can be continuously operated with a constant capacity regardless of the fluctuation of the total heat load. Moreover, it is conceivable to provide an auxiliary heat source on the collective heat source side so that a part of the total heat load is borne by the auxiliary heat source to reduce the capacity of the collective heat source, but in this case, the total heat load is targeted. Therefore, the auxiliary heat source has a large capacity comparable to the collective heat source. On the other hand, according to the present invention, since the auxiliary heat source for the heat load of the demanding portion is provided as the auxiliary heat source, the auxiliary heat source may have a capacity lower than that of the conventional heat source provided in the building. According to the second characteristic configuration, since the heat is stored at the time of the low heat load and the heat can be used at the time of the high heat load, it is possible to use one having a smaller capacity as the collective heat source. According to the third characteristic configuration,
Similarly, since heat can be stored when the heat load is low and the heat can be used when the heat load is high, a smaller capacity auxiliary heat source can be used. In particular, when a power source is used as an auxiliary heat source, the cooling load is maximum during the daytime and minimum during the nighttime, while commercially available power costs are low at night, so it is possible to use cheap nighttime power and reduce costs. Can store heat.

[0006]

As described above, according to the present invention, in the district heat source system, it is possible to surely deal with the heat load in each of the demanding parts, but of course, a collective heat source having a small capacity can be used. The number of times of starting and stopping can be extremely reduced, or starting and stopping can be eliminated, and the heat source device can be operated with high efficiency. In particular, according to claims 2 and 3, the efficiency can be further improved, and according to claim 4, the running cost can be significantly reduced.

[0007]

EXAMPLE As shown in FIG. 1, a district heating / cooling system (an example of a district heat source system) provided with a collective heat source B for distributing and supplying heat to a plurality of demand parts A _{1 to} A _n such as buildings in the region. Is. Each of the consumed electric portion A ₁ to A _n is the fan coil unit 1 for air conditioning in the hot and cold water type, as shown in FIG. 2, the heat storage tank 2 of the chilled water, an auxiliary storage tank 3 of chilled water, power Chiller driven auxiliary refrigerator for cold water generation (an example of auxiliary heat source) 4
A water-water heat exchanger 5A for receiving cold heat, a steam-water heat exchanger 5B for receiving hot heat, and a water-water heat exchanger 6 for radiating heat
An auxiliary water-water heat exchanger 7 for heat dissipation, a heat receiving circuit 8,
Auxiliary heat receiving circuit 9, heat dissipation circuit 10, and auxiliary heat dissipation circuit 11
And a cooling circuit 12A and a heating circuit 12B. The fan coil unit 1 is installed in each room and each floor. That is intended to supply cold water and heat exchanged with cold air people in the air-conditioned locations husband consumed electric unit A ₁ to A _n, radiator coil 1 for heating the heat radiating coil 1A for cooling
B and. The heat receiving circuit 8 circulates water between the heat storage tank 2 and the cold-heat receiving water-water heat exchanger 5A to cool the water in the heat storage tank 2. The auxiliary heat receiving circuit 9 circulates water between the auxiliary heat storage tank 3 and the auxiliary refrigerator 4 to circulate water between the auxiliary heat storage tank 3 and the auxiliary refrigerator 4 and This is to cool water. The heat radiation circuit 10 circulates water between the heat storage tank 2 and the water-water heat exchanger 6 for heat radiation to take out cold heat in the heat storage tank 2 to the water-water heat exchanger 6 for heat radiation. is there. The auxiliary heat radiation circuit 11 circulates water between the auxiliary heat storage tank 3 and the auxiliary water-water heat exchanger 7 to take out cold heat in the auxiliary heat storage tank 3 to the auxiliary water-water heat exchanger 7. . The cooling circuit 12A is
A cooling coil 1A for cooling the fan coil unit 1;
The water-water heat exchanger 6 for heat dissipation, the auxiliary water-water heat exchanger 7 and water are circulated in the order described, and the water-water heat exchanger 6 for heat dissipation and the auxiliary water-water heat exchanger 7 are used. The cold heat thus taken out is carried to the fan coil unit 1. The heating circuit 12B
Circulates water between the heat radiation coil 1B for heating of the fan coil unit 1 and the steam-water heat exchanger 5B for receiving heat, and the heat received by the steam-water heat exchanger 5B is received by the fan coil. It is to be carried to the unit 1. That is, the demand parts A _{1 to} A _n are switchable between a cooling state in which the cold heat is stored in the heat storage tank 2 and the auxiliary heat storage tank 3 and a heating state, and the demand parts A _{1 to} A _n are different from each other. Each of the demand-supply units A equipped with the auxiliary refrigerator 4
Has become. The collective heat source B is a steam generating facility 13
And an absorption refrigerating machine 14 for generating cold / warm water by using steam generated thereby as a heat source. The steam generating facility 13
Are cogeneration, boilers, etc. And
Water is circulated between the absorption chiller 14 of the collective heat source B and the water-water heat exchanger 5A for cold heat reception of each of the demand parts A _{1 to An} , and the water is circulated from the absorption chiller 14 A cold heat supply circuit 15A for supplying cold heat to the water heat exchanger 5A, and a steam generating facility 1
A heat supply circuit 15A for supplying and supplying steam from 3 to the steam-water heat exchanger 5B for receiving heat. Then, as shown in FIG.
Set to those in steady load R of ₁ to A _n can address, the capacity of the auxiliary refrigerator 4, is set to that address the peak load RP of the consumed electric portion A ₁ to A _n. That is, the capacity of the collective heat source B can cope with the sum of the steady loads R of the respective demand parts A _{1 to} A _n . Further, the ability of the auxiliary refrigerator 4 is only by operation power rate low nighttime, ability to perform a thermal storage that can cope with the peak load RP of the consumed electric portion A ₁ to A _n, or at night driving by day and night continuous operation The peak load R of each of the demand parts A _{1 to} A _n is stored by storing the heat that is insufficient during daytime operation.
Any ability to deal with P is acceptable. In the case of the former, only the night driving is performed, and therefore the power rate is low relative to the capacity. On the other hand, in the case of the latter, since the operation is continuous day and night, the capacity is small.

[Other Embodiments] (1) In the above embodiment, the auxiliary heat source 4 operates only during cooling by providing an auxiliary refrigerator, but the auxiliary heat source 4 operates only during heating. However, it may be one that operates both during heating and cooling. The auxiliary heat source 4 that operates during heating may be a refrigerator, a boiler, or the like. (2) Although the heat storage tank 2 is provided in the above embodiment, the heat storage tank 2 may be omitted in implementing the present invention. (3) Although the auxiliary heat storage tank 3 is provided in the above embodiment, the auxiliary heat storage tank 3 may be omitted in implementing the present invention. (4) In the above embodiment, is provided with the auxiliary heat source 4 to all of the consumed portion A ₁ to A _n, the auxiliary heat source 4 to all of the consumed portion A ₁ to A _n
You may implement without providing. (5) As shown in FIG. 4, the auxiliary heat source 4 may be provided for each group by dividing the demand parts A _{1 to} A _n into groups. In this case, each group has a set auxiliary heat source 4
It becomes the demand and demand section A.

It should be noted that reference numerals are given in the claims for convenience of comparison with the drawings, but the present invention is not limited to the configurations of the accompanying drawings by the entry.

[Brief description of drawings]

[Fig. 1] Piping system diagram

[Fig.2] Piping system diagram of main parts

FIG. 3 is a graph showing heat load

FIG. 4 is a piping system diagram showing another embodiment.

[Explanation of Codes] A _{1 to} A _n Demand part B Collective heat source A Demand part 2 Heat storage tank 3 Auxiliary heat storage tank 4 Auxiliary heat source

Claims (4)

[Claims] _1. A regional heat source system comprising a collective heat source (B) for supplying heat to a plurality of demand parts (A _{1 to} A _n ) in a region, said demand parts (A ₁ to A _n ). A district heat source system in which an auxiliary heat source (4) is provided in a set demand and supply section (A) of A _n ). 2. The district heat source system according to claim 1, wherein the demand section (A _{1 to} A _n ) is provided with a heat storage tank (2) for storing the heat supplied from the collective heat source (B). 3. The area according to claim 1 or 2, wherein an auxiliary heat storage tank (3) for storing heat from the auxiliary heat source (4) is provided in the demanding section (A) provided with the auxiliary heat source (4). Heat source system. 4. The district heat source system according to claim 3, wherein the auxiliary heat source (4) is provided with a power source as a drive source.