JPH0431465Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Field of Industrial Application) The present invention relates to a heat supply device suitable for district heating and cooling plants and the like.

(Prior Art) An example of a conventional heat supply system is shown in FIG.
The heat is then supplied to a plurality of heat demand buildings 4, where it is used for heating, cooling, and other purposes, and after being radiated and cooled, it returns to the energy center 1 via a return pipe 5.

(Problems to be solved by the invention) In the conventional heat supply device described above, the heat demand in the heat demand building 4 changes depending on the season, month, and day, and also changes depending on the time of the day. The heat demand at night is low. However, since the capacity of Energy Center 1 is set to meet the maximum heat demand throughout the year, that is, the peak load, it has an excessive capacity compared to the average heat demand. Not only does it require equipment costs, but
Since the system was under partial load for most of its operating time, the equipment was inefficient and energy was wasted.

(Means for solving the problems) The present invention was proposed to solve the above problems, and its gist is to provide an energy center that produces hot or cold water, and an energy center that produces hot or cold water. In a heat supply system consisting of a heat demand building to be used, hot water or cold water supply piping and return piping provided between the energy center and the heat demand building, and a pump provided in the supply piping, an on-off valve is provided. By connecting bypass pipes interposed with the supply pipe and the return pipe at appropriate positions on the suction side and discharge side of the pump, respectively, the supply pipe and return pipe between the bypass pipes are used as a heat storage tank. A heat supply device is characterized in that it is possible to

(Function) Since the present invention has the above configuration, when the heat demand in the heat demand building is large, the on-off valve installed in the bypass valve is closed and hot water or cold water produced at the energy center is used. It is circulated through the supply piping, heat demand building, and return piping.
When the heat demand is small, production of hot water or cold water at the energy center is stopped, and by opening the on-off valve installed in the bypass piping, the supply piping and return piping between the bypass piping are The stored hot water or cold water is circulated to the heat demand building.

(Embodiment) An embodiment of the present invention is shown in FIG. 1, in which 1 is an energy center that produces hot water or cold water, 4 is a heat demand building that uses hot water or cold water, and 3 is an energy center 1 and a heat demand building. Hot water or cold water supply pipe installed between 4 and 5 is energy center 1
A hot water or cold water return pipe is provided between the heat demand building and the heat demand building 4, and 2 is a pump provided in the supply pipe 3, which is the same as the conventional one shown in FIG. On the absorption side of the pump 2, the supply pipe 3 and the return pipe 5 are connected by a bypass pipe 6, and an on-off valve 7 is interposed in the bypass pipe 6. Also,
On the discharge side of the pump 2, the supply pipe 3 and the return pipe 5 are connected by a bypass pipe 8, and an on-off valve 9 is interposed in the bypass pipe 8.

When there is a heat demand (heat load) in the heat demand building 4, hot water or cold water produced in the energy center 1 is supplied to the heat demand building 4 through the supply piping 3 by operating the pump 2, and After finishing supplying heat to energy center 4, it returns to energy center 1 through return pipe 5. At this time, the on-off valves 7 and 9 installed in the bypass pipes 6 and 8 are closed. When the heat load is low, a small amount of hot or cold water supply is sufficient.

When there is no heat load or the heat load is very small, such as at night, the on-off valve 9 is opened and the energy center 1 is closed.
to produce an optimum amount of hot or cold water, and operate the pump 2 to send the hot or cold water through the supply pipe 3. However, since there is almost no heat load on the heat demand building 4, most of the hot water or cold water passes through the on-off valve 9 and returns to the return pipe 5 without wasting much of the heat it possesses. The on-off valve 9 is controlled to maintain the required pressure of hot or cold water to be supplied. In this way, hot water or cold water at the supply temperature can be stored in the supply pipe 3 and return pipe 5 between the bypass pipes 6 and 8, that is, in the heat storage tank section shown with diagonal lines. The heat stored in the heat storage tank can be monitored by a thermometer provided in the return pipe 5. Once the heat storage tank is filled with hot or cold water at the supply temperature,
Production of hot or cold water at Energy Center 1 will be discontinued. Note that when storing heat in the heat storage tank section, low-cost electricity at nighttime rates can be used.

The next morning, people started working in each heat demand building 4.
The on-off valve 9 is closed and the on-off valve 7 is opened before the heat demand increases. Then, until the hot water or cold water at the supply temperature stored in the return pipe 5 is exhausted, hot water or cold water can be supplied to the heat demand building 4 by simply operating the pump 2 without producing hot water or cold water in the energy center 1. .

In this way, in general, demand increases rapidly for about two hours in the morning, and peak loads often occur during this time, but by adopting the above operating method, energy conservation can be achieved. becomes possible. It goes without saying that the larger the volume of the hatched pipe, the greater the effect as a heat storage tank.

(Effects of the invention) In the present invention, a bypass pipe equipped with an on-off valve is connected to the supply piping and the return piping at an appropriate position on the suction side and an appropriate position on the discharge side of the pump. Since the piping and return piping can be used as a heat storage tank, by adding an extremely simple and inexpensive configuration, the equipment cost of the energy center can be reduced, and the operational efficiency of the equipment can be improved, contributing to energy conservation. becomes possible.

[Brief explanation of the drawing]

Figure 1 is a system diagram showing one embodiment of the present invention;
The figure is a system diagram of a conventional heat supply device. Energy center...1, Heat demand building...
4. Supply piping...3. Return piping...5. Pump...
...2, Bypass piping...6, 8, On-off valve...7,
9.

Claims (1)

[Scope of utility model registration request] An energy center that produces hot water or cold water, a heat demand building that uses hot water or cold water, supply piping and return piping for hot water or cold water installed between the energy center and the heat demand building, and in the supply piping. In a heat supply device consisting of a pump, this can be achieved by connecting bypass pipes equipped with on-off valves to the supply piping and return piping at appropriate positions on the suction side and discharge side of the pump, respectively. A heat supply device characterized in that a supply pipe and a return pipe between bypass pipes can be used as a heat storage tank.