JP3299391B2 - Heat supply device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat supply device using ice water, and more particularly to a heat supply device using ice water suitable for a district heat supply device. In the present invention,
The ice water includes not only ice water composed of pure H ₂ O but also a mixture of other substances.

[0002]

_2. Description of the Related Art In recent years, the Architectural Institute of Japan and the like have been actively studying LCCO ₂ (life cycle CO ₂ ) for evaluating buildings and equipment from the viewpoint of global warming due to CO ₂ . This evaluation has also begun to be studied in the area of district heating and cooling (hereinafter abbreviated as DHC). That is, DHC
Of CO ₂ generated during construction, C generated during operation
The idea is that the amount of O ₂ generated and the amount of CO ₂ generated at the time of disposal are totaled as a “life cycle”, and the total amount of generated CO _{2 is} reduced as much as possible.

[0003] According to this concept, an ice water transport DHC that transports a mixed fluid of ice chips and water as a cold fluid has recently come into the spotlight. The reason is that the ice water transport DHC method generates a little CO ₂ to produce ice water,
CO ₂ emissions for the pipe construction CO ₂ emissions and pump power per transport heat is reduced, can still less CO ₂ emissions for power plants by performing nighttime thermal storage operation, overall LCCO ₂ can be reduced.

FIG. 2 is a block diagram showing a system configuration example of a conventionally proposed DHC device.
The building 40 is a consumer building without an ice melting tank, and the building 50 is a consumer building in which an ice melting tank 50-1 is installed. As shown in the figure, the heat storage ice making device 30 produces ice water as a warm fluid and a mixed fluid of ice and water, and the ice water is supplied to the customer buildings 40 and 50 through the ice water supply main pipe 1 by the pump 30-1, and the cold heat is generated. The return water after the supply is returned to the heat storage ice making device 30 through the cold fluid return main pipe 2. Similarly, the warm fluid is supplied to the customer buildings 40, 50 through the warm fluid supply main pipe 3 by the pump 30-2, and after supplying heat, is returned to the heat storage ice making device 30 through the warm fluid return main pipe 4.

[0005] In the case of the customer building 40, ice water flows from the ice water supply main pipe 1 through the ice water supply branch pipe 5 to the heat exchanger 40 for cooling and heating.
The return water is supplied to the cold fluid return main pipe 2 through the two-way temperature control valve 40-6 and the cold fluid return branch pipe 6. The temperature of the return water is detected by the temperature controller 40-7,
Further, the temperature controller 40-7 controls the two-way temperature control valve 40-6 to control the flow rate, and adjusts the temperature of the return water to an appropriate temperature (1
(4 ° C.). The cold water cooled by the heat exchanger for cooling 40-5 is supplied to each cooling load by the pump 40-8 and returned to the heat exchanger for cooling 40-5. In addition, you may use the cooling load for air conditioning etc. directly instead of this heat exchanger 40-5 for cooling.

Similarly, the warm fluid is supplied from the warm fluid supply main pipe 3 through the warm fluid supply branch pipe 7 to the heat exchanger 40-1 for heating, and the return water is supplied to the two-way temperature control valve 40-2 and the warm fluid. It is returned to the warm fluid return main pipe 4 through the return branch pipe 8. The return water temperature is controlled by a two-way temperature control valve 40 using a temperature controller 40-3.
-2 is adjusted to control the flow rate, and the temperature of the return water is maintained at an appropriate temperature (32 ° C.). Heat exchanger 40-1 for heating
The hot water heated in is supplied to each heating load by the pump 40-4, cooled, and returned to the heat exchanger for heating 40-1 again.

In the customer building 50, ice water flows from the ice water supply main pipe 1 through the ice water supply branch pipe 5 to the ice melting tank 50-.
1. The cold water in the ice melting tank 50-1 is supplied to a cold heat exchanger (low temperature side) 50-3 by a pump 50-2, and a part of the return water is supplied to a bypass pipe 5.
It is supplied to the ice melting tank 50-1 through 0-11 and is used to melt a part of the ice pieces, and the other return water is used as a cooling heat exchanger (high temperature side) 50-4 and a two-way temperature control valve 50. -5, and is returned to the cold fluid return main pipe 2 through the cold fluid return branch pipe 6.

The temperature of the cold fluid return water is controlled by a temperature controller 50-6.
Further, the temperature controller 50-6 controls the two-way temperature control valve 50-5 to control the flow rate and maintain the temperature of the return water at an appropriate temperature (14 ° C.). Heat exchanger 50 for cold heat
The cold water cooled at -3 is supplied to each cooling load by the pump 50-7, passes through the cooling heat exchanger 50-4, is returned to the cooling heat exchanger 50-3, and is circulated. The heating by the warm fluid is the same as the heating of the building 50 described above.

[0009]

However, although many ice water transport DHC systems have been proposed, including the above system, the conventionally proposed systems have problems and are still in practical use. Has not been reached. The biggest problem is that ice pieces may be clogged at a bent portion of a pipe, a heat exchanger, or the like, causing blockage. That is, ice pieces adhere to the bent portion of the pipe, and another piece of ice adheres to the ice pieces one after another, making it difficult for ice water to flow.

In addition, since the automatic load adjusting device operates so that ice water flows more, ice water flows in a small gap which is hardly made to flow by the ice chips, so that more ice chips adhere and finally a large amount of ice flows in the flow path. And the cooling is stopped for a long time.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and in order to eliminate the above-mentioned problems, in a heat supply apparatus for supplying heat using a mixed fluid of ice and a fluid and a warm fluid, It is an object of the present invention to provide a heat supply device that can prevent a flow path through which water flows from being blocked by ice chips, or can quickly recover from a blocked state.

[0012]

SUMMARY OF THE INVENTION In order to solve the above problems, the present invention provides an ice fluid supply pipe (1) for supplying a mixture of ice and fluid from a heat storage ice making device (30), and an ice fluid supply pipe (1). Cooling load (10-) cooled directly or indirectly by the mixture
3, 20-13) and the cooling load (10-3, 20-1).
3) Flow control means for controlling the flow rate of the return fluid from the load according to the change in capacity (controllers 10-12, 20-18,
Temperature detectors 10-13, 20-19, etc.), a cold fluid return pipe (6) for returning the return fluid from the cold load (10-3, 20-13), and a heat storage ice making device (30). A hot fluid supply pipe (3) for supplying a warm fluid, and a thermal load (10-8, 2) heated directly or indirectly by the warm fluid.
0-16), a heat fluid return pipe (8) for returning a return fluid from the thermal load (10-8, 20-16), and a heat pipe composed of a pipe, a valve, a pump, and the like connecting these pipes. In the supply device, the cold fluid in the flow path from the ice fluid supply pipe (1) to the cold load (10-3, 20-13) is
A hot fluid heating bypass unit (bypass pipe 10-14, bypass pipe 20-21, etc.) for heating with hot fluid supplied from the hot fluid supply pipe (3) is provided.

Further, pressure loss detecting means (pressure sensors 10-16, 20-20, pressure sensor 10-) for directly or indirectly detecting the pressure loss in the flow path from the ice fluid supply pipe (1) to the cold load. 1-2, 20-1-2), and when the pressure loss detected by the pressure loss detecting means becomes equal to or more than a predetermined value, the fluid is passed through the fluid heating bypass means (bypass pipe 10-14, bypass pipe 20-21, etc.). The method is characterized in that a warm fluid is sent into the flow path.

[0014]

According to the present invention, since the hot fluid heating bypass means for heating the cold fluid with the hot fluid supplied from the hot fluid supply pipe as described above is provided, the hot fluid heating bypass means is provided in the flow path from the ice fluid supply pipe to the cold load. When the ice adheres and the pressure loss increases, the ice adhered in the flow path can be melted by flowing the hot fluid into the flow path through the hot fluid heating bypass means. It can be prevented from being blocked by ice chips, or can be promptly recovered when it becomes blocked.

Further, a pressure loss detecting means for directly or indirectly detecting a pressure loss in a flow passage from the ice fluid supply pipe to the cooling load is provided, and the pressure loss detected by the pressure loss detecting means is equal to or more than a predetermined value. When the hot fluid is sent through the fluid heating bypass means into the flow path, ice chips adhere to the flow path pipe from the ice fluid supply pipe to the cold load, and the pressure loss in the flow path increases. The ice chips can be automatically melted, and the blocked state of the flow channel can be prevented before it occurs.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a block diagram showing a configuration example of the heat supply device of the present invention. FIG. 1 shows an example of a district heating / cooling system in which the heat supply device of the present invention is used in a building 10 and a building 20. As shown in the drawing, the heat storage ice making device 30 produces ice water which is a warm fluid and a mixed fluid of ice and water, and the ice water is supplied to each of the buildings 10 and 20 through the ice water supply main pipe 1 by the pump 30-1. Is supplied to the heat storage ice making device 30 through the cold fluid return main pipe 2. Similarly, the warm fluid is supplied to each building through the warm fluid supply main pipe 3 by the pump 30-2, and the return water after supplying the heat is returned to the thermal storage device 30 through the warm fluid return main pipe 4.

In the building 10, a cold fluid is directly supplied to the cold load 10-3, and a hot fluid is directly supplied to the hot load 10-8. Ice water is supplied from an ice water supply main pipe 1 to an ice water supply branch pipe 5
Is supplied to the ice melting tank 10-1. Ice melting tank 10
-1 also serves as heat storage for cold heat, and the ice melting tank 1
The ice water flowing into 0-1 is heated by the load return water supplied from the nozzle 10-1-1, and a part of the ice pieces in the ice water is melted. Cold water at about 0 ° C. at the bottom of the ice melting tank 10-1 is supplied to a cooling load 10-3 by a pump 10-2.

The return water after supplying cold heat is supplied to the valve 10-
Part 4 passes through the ice melting tank 10-1 to melt part of the ice pieces, and other return water passes through the three-way automatic temperature control valve 10-5, the three-way solenoid valve 10-6, and the cold fluid return branch pipe 6. The fluid is returned to the cold fluid return main pipe 2 and circulated. The temperature of the return water is detected by the temperature detector 10-13, and the controller 10-12 controls the three-way automatic temperature control valve 10-5 to adjust the temperature of the return water to 14 ° C.

Accordingly, the cold fluid of the ice water supplied from the heat storage ice making device 30 passes through the cold load 10-3 in the building 10, and uses both the latent heat of ice and the sensible heat from 0 ° C. to 14 ° C. From the cold fluid return main pipe 2 again to the heat storage ice making device 3
Returned to 0. The other outlet of the three-way solenoid valve 10-6 is connected to the hot fluid return branch pipe 8 and the bypass pipe 10-15.

On the other hand, the hot water passes from the hot fluid supply main pipe 3 to the hot fluid supply branch pipe 7, the three-way solenoid valve 10-7, and the thermal load 10
-8. Return hot water after heating is supplied to valve 10-
9, the control valve 10-10 and the hot fluid return branch pipe 8 return to the hot fluid return main pipe 4 and circulate. Temperature controller 10-
Numeral 11 detects the temperature of the return water and adjusts the temperature to 32 ° C. by controlling the control valve 10-10. The other outlet of the three-way solenoid valve 10-7 is connected to the ice water supply branch pipe 5 and the bypass pipe 10-14.

A pressure sensor 10-16 is provided at a point q in the middle of the ice water supply branch pipe 5, and a pressure sensor 10-1-2 is provided inside the ice melting tank 10-1.
2 constantly monitors the pressure difference between the two sensors. For example, if the ice is closed at the bent portion p of the ice water supply pipe due to some trouble in this operation state, the pressure difference between the inside of the ice melting tank and the point q in the middle of the ice water supply branch pipe 5 becomes large.

The controller 10-12 has a pressure sensor 10-1-2 inside the ice melting tank and a pressure sensor 10-
When the pressure difference is detected from 16 and the pressure difference becomes equal to or more than the set value, the temperature control of the cold fluid return water which has been performed until then is stopped, and the three-way solenoid valve 10-6 and the three-way solenoid valve 10-7 are switched. Hot water is supplied from the hot fluid supply branch pipe 7 → three-way solenoid valve 10-
7 → bypass pipe 10-14 → ice melting tank 10-1 → three-way automatic temperature control valve 10-5 → three-way solenoid valve 10-6 → bypass pipe 10-15 → hot fluid return branch pipe 8. That is, ice is melted by flowing high-temperature hot water into the closed part p.

As described above, the heat supply device of the present invention detects the occurrence of a blockage state with ice pieces by detecting the pressure difference, switches the three-way solenoid valve 10-6 and the three-way solenoid valve 10-7, and supplies hot water to the blockage. , The closed state can be automatically and promptly restored.

The building 20 has a heat exchanger for cold heat (low temperature side) 20.
-3 and the cold heat load 20-13 via the cold heat exchanger (high temperature side) 20-4 to supply the cold heat to the cold heat load 20-13.
This is an example of supplying a warm fluid to a thermal load 20-16 via -8. Ice water is supplied from the ice water supply main pipe 1 to the ice melting tank 20-1 through the ice water supply branch pipe 5.

The ice-melting tank 20-1 also serves as cold heat storage, and the ice water flowing into the ice-melting tank 20-1 from the inflow port is returned to the cold-heat heat exchanger (low-temperature side) 20-3 by one of the return water. Part is supplied and a part of the ice piece is melted. This ice melting tank 20-1
The cold water at about 0 ° C. at the bottom is supplied to a heat exchanger for cooling / heating (low temperature side) 20-3 and a heat exchanger for cooling / heating (high temperature side) 20-4 by a pump 20-2.

A part of the return water after supplying the cold heat passes through the ice melting tank 20-1 to melt a part of the ice pieces, and the other return water is supplied to the temperature control valve 20-5, the three-way solenoid valve 20-6, It is returned to the cold fluid return main pipe 2 through the cold fluid return branch pipe 6. The temperature of the return water is detected by the temperature detector 20-19 and the controller 2
Reference numeral 0-18 controls the temperature control valve 20-5 to adjust the temperature of the return water to 14 ° C. Other flows of the cold fluid and the hot fluid are the same as those of the building 10, and the description is omitted.

A pressure sensor 20-20 is provided at a point q 'in the middle of the ice water supply branch pipe 5, and a pressure sensor 20-1-2 is provided inside the ice melting tank 20-1. Controller 20-18 constantly monitors the pressure difference between both sensors.
In this state, when the ice is closed at the bent portion p ′ of the ice water supply pipe, the pressure difference between the inside of the ice melting tank 20-1 and the point q ′ in the middle of the ice water supply branch pipe 5 increases.

The controller 20-18 includes a pressure sensor 20-1-
2 and the output of the pressure sensor 20-20 from the ice melting tank 2
The pressure difference between the internal pressure at 0-1 and the pressure at the point q 'is detected, and when the pressure difference exceeds a set value, the temperature control of the cold fluid return water which has been performed so far is stopped, and the three-way solenoid valve 20-6 is stopped. And the three-way solenoid valve 20-7 is switched so that the hot water is supplied from the hot fluid supply branch pipe 7 → the three-way solenoid valve 20-7 → the bypass pipe 20-21 → the ice melting tank 20-1 → the bypass pipe 20-23 → the temperature control valve 20.
-5 → three-way solenoid valve 20-6 → bypass pipe 20-22 → hot fluid return branch pipe 8 That is, ice is melted by flowing high-temperature hot water into the closed part p ′.

In the above description, the means for automatically recovering the ice-melting tank 10-1 and the blockage of the inlet of the ice-melting tank 20-1 by ice chips by flowing hot water has been described. It is needless to say that the present invention is not limited to the inlet of the melting tank, but can be applied to any blockage state by ice chips. Although the above description has been made with ice water, not only ice water composed of pure water but also impurities may be mixed or melted.

[0030]

As described above, according to the present invention, the following excellent effects are expected. (1) Since the hot fluid heating bypass means for heating the cold fluid by the hot fluid supplied from the hot fluid supply pipe is provided, ice adheres to the flow pipe from the ice fluid supply pipe to the cold load, and pressure loss occurs. When the increased flow path is about to be closed, the ice adhered to the flow path can be melted by flowing the hot fluid into the flow path pipe through the hot fluid heating bypass means, and the flow path is closed. Can be prevented, and can be quickly recovered in the case of a closed state.

(2) Further, a pressure loss detecting means for directly or indirectly detecting a pressure loss in a flow path from the ice fluid supply pipe to the cooling load is provided, and the pressure loss detected by the pressure loss detecting means is predetermined. At this time, by sending the warm fluid into the flow path through the fluid heating bypass means, ice chips adhered to the flow path pipe from the ice fluid supply pipe to the cold load, and the pressure loss in the flow path increased. In this case, the ice pieces can be automatically melted, and the closed state of the flow path can be prevented.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration example of a heat supply device of the present invention.

FIG. 2 is a block diagram illustrating a configuration example of a conventional heat supply device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Ice water supply main pipe 2 Cold fluid return main pipe 3 Hot fluid supply main pipe 4 Hot fluid return main pipe 5 Ice water supply branch pipe 6 Cold fluid return branch pipe 7 Hot fluid supply branch pipe 8 Hot fluid return branch pipe 10 Building 10-1 Ice melting tank 10-1-1 Nozzle 10-1-2 Pressure sensor 10-2 Pump 10-3 Cold load 10-4 Valve 10-5 Three-way automatic temperature control valve 10-6 Three-way solenoid valve 10-7 Three-way solenoid valve 10-8 Heat Load 10-9 Valve 10-10 Control valve 10-11 Temperature controller 10-12 Controller 10-13 Temperature detector 10-14 Bypass pipe 10-15 Bypass pipe 10-16 Pressure sensor 20 Building 20-1 Ice melting tank 20-1-2 Pressure sensor 20-2 Pump 20-3 Heat exchanger for cold heat (low temperature side) 20-4 Heat exchanger for cold heat (high temperature side) 20-5 Temperature control valve 20-6 Three-way power Valve 20-7 Three-way solenoid valve 20-8 Heat exchanger for heating 20-10 Control valve 20-11 Temperature controller 20-12 Pump 20-13 Cold load 20-14 Valve 20-15 Pump 20-16 Heat load 20- 17 Valve 20-18 Controller 20-19 Temperature detector 20-20 Pressure sensor 20-21 Bypass pipe 20-22 Bypass pipe 20-23 Bypass pipe 30 Ice storage device 30-1 Pump 30-2 Pump

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-5-157296 (JP, A) JP-A-6-137620 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) F24F 5/00

Claims (2)

(57) [Claims] 1. An ice fluid supply pipe for supplying a mixture of ice and fluid from a thermal storage ice making device, a cooling load directly or indirectly cooled by the mixture of ice and fluid, and a capacity of the cooling load. Flow rate adjusting means for controlling the flow rate of the return fluid from the load according to the change, a cold fluid return pipe for returning the return fluid from the cold load, and a hot fluid for supplying the hot fluid from the heat storage ice making device It is composed of a supply pipe, a thermal load heated directly or indirectly by the hot fluid, a hot fluid return pipe for returning the return fluid from the thermal load, and a pipe, a valve, a pump, and the like connecting these. in the heat supply system, the蓄 from the ice fluid supply tube to the flow channel pipe leading to the cooling load
The temperature supplied from the hot ice making device through the hot fluid supply pipe
Fluid supply, heat supply apparatus characterized in that a hot fluid heating bypass means for heating the cold fluid of the duct pipe. 2. A pressure loss detecting means for directly or indirectly detecting a pressure loss in a flow passage from the ice fluid supply pipe to a cooling load, wherein the pressure loss detected by the pressure loss detecting means is equal to or more than a predetermined value. 2. The heat supply device according to claim 1, wherein when it becomes, a hot fluid is sent into the flow path through the hot fluid heating bypass means.