JPH09229388A - Air conditioning piping system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To lower the capacity of equipment of a fluid force feeder such as hot water pump in air conditioning equipment. SOLUTION: An air conditioning piping system is provided with an air conditioning heat source B, a piping circuit of a heat medium fluid to circulate a heat medium for air conditioning of the air conditioning heat source through air conditioning equipment 10 and a fluid force feed pump P to feed the heat medium fluid under pressure. A loop piping circuit closed in substance is formed totally. A fluid pressure of a heat medium supply pipeline 20 for linking the air conditioning equipment to a delivery port of the pump is set to a positive pressure and the fluid pressure of a heat medium return pipeline 30 for linking the air conditioning equipment to a suction port of the pump to a negative pressure. Thus, the fluid of the heat medium return pipeline is supplied by a suction vacuum of the pump.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air conditioning pipe system, and more particularly, to a hot water pump or the like by effectively utilizing the negative pressure (pressure below atmospheric pressure) of the fluid in the air conditioning pipe. The present invention relates to an air conditioning piping system capable of reducing the equipment capacity of a fluid pumping device.

[0002]

2. Description of the Related Art Generally, an air conditioner which constitutes a cooling device or a heating device of a building or the like is connected to a heat medium pipe for supplying a heat medium for air conditioning such as cold water or hot water, and the heat medium pipe is a chiller or a boiler. Is connected to a cold heat source or a heat source.
The piping forms a loop piping path or a ring piping path for circulating the heat medium fluid cooled or heated in the heat source to the air conditioner. The flow rate of the heat medium fluid in this type of piping is designed based on the cooling load or the heating load of the cooling device or the heating device arranged in each air conditioning region, and the pipe diameter of the pipe is the flow rate and the pipe resistance, and further It is substantially determined based on the capacity or capacity of a pumping device such as a cold water or hot water pump. In this type of air conditioning piping system, the capacity of the pump that constitutes the fluid pumping device is determined by the total discharge amount and total head of the pump that can circulate the required heat medium fluid throughout the piping circuit. The discharge amount of the pump is generally set based on the air conditioning conditions and the cooling load or heating load of the target air conditioning area, and the pump head generally secures a positive pressure in the entire piping circuit, and the end of the circulation circuit, that is, the pump The suction port is set to form a positive (plus) discharge fluid pressure (pressure equal to or higher than atmospheric pressure).

[0003]

However, in the circulation circuit of the heat medium fluid by such a conventional design method,
As the target air conditioning area becomes large in scale, or the cooling load or the heating load increases, the pump capacity is set to be extremely high, so that the pump becomes large in capacity or large in size. Such an increase in capacity or size of the pump not only increases the construction cost of the building equipment, but also significantly increases the electric capacity and power consumption of the air conditioning equipment. Will be increased to. The present invention
The present invention has been made in view of such circumstances, and an object thereof is to provide an air conditioning piping system capable of reducing the equipment capacity of a fluid pumping device such as a hot water pump in an air conditioning equipment.

[0004]

In order to achieve the above object, the present invention provides an air conditioning heat source, a piping circuit of a heat medium fluid for circulating an air conditioning heat medium of the air conditioning heat source to an air conditioner, and the heat generating device. In an air conditioning piping system that includes a fluid pressure pump that pumps a heat medium fluid to the medium piping, and that forms a substantially closed loop piping circuit as a whole, heat that connects the air conditioning equipment and the discharge port of the pump. The fluid pressure of the medium supply pipeline is set to a positive pressure, the fluid pressure of the heat medium return pipeline connecting the air conditioner and the suction port of the pump is set to a negative pressure, and the fluid of the heat medium return pipeline is set. Is supplied by the suction negative pressure of the pump. According to the above configuration of the present invention, the loop-type closed piping system including the fluid pressure pump includes the heat medium supply pipeline on which the fluid pressure above atmospheric pressure acts and the heat medium on which the fluid pressure below atmospheric pressure acts. And a return line. The fluid in the return conduit is sucked into the fluid pressure pump by the negative pressure of the suction port or suction port of the fluid pressure pump. That is, the fluid in the heat medium circulation circuit not only circulates in the circuit by the positive pressure of the fluid pressure pump, but also flows in the return pipe line under the negative pressure formed by the fluid pressure pump and is sucked by the fluid pressure pump. Therefore, in the air-conditioning piping system of the present invention, unlike the conventional design in which the fluid is pumped to the pump suction port only by the pushing pressure of the fluid pressure pump, the negative pressure (suction pressure) of the fluid pressure pump is effectively used to control the piping system. Since the heat carrier fluid is circulated, the capacity of the fluid pressure pump can be reduced.

Further, particularly in a piping system including a radiator or a heat exchanger using a small-diameter pipe or a thin pipe, a fluid such as a heat medium liquid is satisfactorily circulated by utilizing a positive fluid pressure as a whole. Although it is actually difficult to do so, the piping system having the above-described configuration that uses a negative fluid pressure allows a required amount of fluid to flow relatively smoothly with respect to a piping system including a small diameter pipe or a thin pipe. Can be cycled to. Moreover,
Since a relatively low pressure fluid pressure acts only on the pipelines that make up the piping system, it is possible to reduce the pressure or load on the pipe material or the pipe wall, etc., and prevent damage or deterioration of the piping system constituent members. It will be possible.

[0006]

According to a preferred embodiment of the present invention, the air conditioning heat source is a hot water heat source, the heat medium fluid is hot water or a high temperature heat medium liquid (hereinafter referred to as hot water), and the hot water heat source is Is interposed in the heat medium return pipe, and the hot water supply means is connected to the return pipe. The fluid pressure pump designed to have a relatively small capacity according to the present invention smoothly circulates the hot water of the hot water heat source through the loop type closed piping circuit. In a preferred embodiment of the present invention, the air conditioner is constructed by embedding a conduit assembly, which is an assembly of a plurality of conduits arranged in parallel at a distance, in a self-leveling material. It is a floor heating system. The conduit assembly includes a substrate extending between the conduits and interconnecting adjacent conduits. The conduit assembly is laid on a floor base and covered with a self-leveling material. . The first end of the conduit assembly is connected to the heat medium supply conduit, the second end of the conduit assembly is connected to the heat medium return conduit, and the positive pressure of the heat medium supply conduit is , Convert to negative pressure in the conduit assembly and a negative fluid pressure is formed at the second end of the conduit assembly. In a preferred embodiment of the invention, the suction port or suction port of the pump is optionally connected via a hot water supply header to the outlet of a hot water heating coil such as a hot water boiler. The hot water heating coil provided on the suction side of the fluid pressure pump is sucked by the pump under negative pressure due to the suction pressure of the pump. According to this configuration, the hot water heating coil or the like, which generally acts as a relatively large conduit resistance in the positive pressure conduit, is arranged in the negative pressure conduit portion, thereby effectively reducing the conduit resistance of the entire circulation piping circuit. be able to.

Preferably, the hot water circulation amount adjusting means for automatically compensating the hot water circulation amount of the entire hot water piping system is connected to the hot water reflux header or the hot water heating coil. According to such a configuration, the hot water circulation amount adjusting means can quickly and smoothly supply the makeup water in the return pipe portion, so that the hot water heating coil is prevented from being damaged or damaged due to the excessive action of the negative pressure. can do. The piping system of the present invention can be applied not only to a closed or semi-closed piping system but also to an air conditioning piping system of a general design depending on the design. Further, the above configuration of the present invention can be applied not only to hot water pipes that circulate a relatively high-temperature heat medium liquid, but also to piping systems including cold water pipes and the like.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below in detail with reference to the accompanying drawings. FIG. 1 is a schematic sectional view of a hot water floor heating apparatus to which an air conditioning piping system according to an embodiment of the present invention is applied, and FIG. 2 is a perspective view and a partially enlarged sectional view of the pipeline assembly shown in FIG. is there. The floor heating device 1 of the hot water circulation system includes a pipeline assembly 10 of hot water piping arranged on a floor substrate 2 such as a concrete floor slab, and a pipeline assembly 10.
And the floor base material 3 that covers the. Pipe line assembly 1
As shown in FIG. 2, 0 is interconnected between the six pipelines 12a to 12f arranged at predetermined intervals in the width direction and the pipelines 12 extending between the pipelines 12 and adjacent to each other. Is a long sheet-like molded product composed of a substrate 14 for Each pipeline 12 of the pipeline assembly 10 is a pipeline having a substantially circular cross-sectional shape, as shown in FIG.
A fluid passage 13 capable of pumping or communicating a fluid is provided in the central portion. Each conduit 12 is interconnected by a tangentially extending substrate 14. For example, the mutual interval between the pipe lines 12 is 1
It is set to about 5 to 40 mm, and the outer diameter and the inner diameter of each conduit 12 are designed to be about 10 to 15 mm and about 5 to 10 mm, respectively.

The duct assembly 10 is made of a synthetic rubber or other rubber material, a synthetic resin, or an integrally molded product made of a mixed material of synthetic rubber and synthetic resin as a base material, and is preferably made of synthetic fiber or natural fiber. It is a long sheet-shaped integrally molded product obtained by continuously extruding a hybrid polymer elastomer containing a special rubber mixed with a short fiber reinforcing material as a base material or a main material by an injection molding machine. The conduit assembly 10 has elasticity that can be deformed relatively easily, and as shown in FIG.
It is wound as a roll R of a long sheet material. Roll R
The pipeline assembly 10 that has been transported or transported to the construction area (construction site) of the building in the above form is unrolled from the roll R, and is arranged or laid at a predetermined construction site on the floor substrate 2. In the construction, after the conduit assembly 10 is unrolled from the roll R with the conduit 12 arranged on the upper side, for example, the lower surface of the substrate 14 and the upper surface of the floor substrate 2 are bonded by a cationic adhesive, and then , A cement-based or ceramic-based self-leveling material, and a floor base material 3 shown in FIG.
To form Furthermore, after the floor base material 3 in which the duct assembly 10 is embedded is dried and hardened or stabilized, a floor finish material 4 such as a P tile, a vinyl chloride sheet or a carpet is laid on the floor base material 3 according to a predetermined construction method. Then, the construction of the floor heating system 1 shown in FIG. 1 is completed.

FIG. 3 is a piping circuit diagram of a hot water piping system according to a preferred embodiment of the present invention. The continuous pipe line assembly 10 laid over the entire floor heating area 7 is connected to the hot water supply pipe 20 (shown by a solid line) and the hot water return pipe 30 (shown by a dotted line), and via the hot water supply pipe 20. Pipe line assembly 1
The hot water fed to 0 is sent to the hot water return pipe 30.
A header unit (not shown) is arranged in each floor heating area, and each header unit includes a forward pipe header and a return pipe header. The first end 10a of the pipeline assembly 10 is connected to the hot water supply pipe 20 via the forward header, and the second end 10b of the pipeline assembly 10 is returned to the hot water supply via the return header. It is connected to the pipe 30. As a modified example of the above-mentioned pipeline connection system, pipelines 12a that configure the pipeline aggregate 10 are provided.
The first ends 10a of 12c and 12e are connected to the hot water supply pipe 20, the second ends 10b of the pipes 12a, 12c and 12e are connected to the hot water return pipe 30, and the pipes 12b and 12e are connected.
A design may be adopted in which the first ends 10a of d and 12f are connected to the hot water return pipe 30 and the second ends 10b of the conduits 12b, 12d, and 12f are connected to the hot water supply pipe 20. According to such a pipe connection method, hot water is passed through the pipe lines 12 adjacent to each other in the pipe line aggregates 10 in opposite directions, so that the temperature distribution of the pipe line aggregates 10 is made uniform overall. To do.

Each hot water supply pipe 20 for supplying hot water to each floor heating area 7 is connected to the discharge port or delivery port of the hot water pump P, and the suction port or suction port of the hot water pump P is connected via the suction pipe 34. Hot water supply header 2
Connected to 1. On the other hand, the hot water return pipes 30 forming the hot water return passages of the floor heating areas 7 are connected to the hot water return header 31. The low-temperature water feed pipe 32 connected to the hot-water recirculation header 31 is connected to the inlet 41 of the hot-water heating coil 40 of the hot-water boiler B, and the high-temperature water feed pipe 33 connected to the hot-water supply header 21 is the hot-water boiler. It is connected to the outlet 42 of the hot water heating coil 40 of B. As the hot water boiler B, for example, a gas boiler, an electric heating type boiler, a heavy oil fuel type boiler, a petroleum boiler or the like is adopted. Instead of the hot water boiler B, it is also possible to use a heat pump absorption type cold / hot water generator or the like. A hot water circulation amount adjusting device 50 that automatically compensates the hot water circulation amount of the entire hot water piping system is connected to the hot water recirculation header 31 via a hot water supply pipe 51. The adjusting device 50 that absorbs the volume change of the heat carrier liquid (warm water) due to the temperature change includes pressure detecting means (not shown) for detecting a decrease in the fluid pressure in the hot water reflux header 31, and the pressure detecting means is a fluid. When a decrease in pressure is detected, makeup water is automatically supplied to the warm water return header 31 via the warm water supply pipe 50.

Hot water supply pipe 20, conduit assembly 10, hot water return pipe 30, hot water return header 31, low temperature water supply pipe 32,
A series of hot water circulation circuits constituted by the hot water heating coil 40, the hot water supply pipe 33, the hot water supply header 21 and the suction pipe 34 form a substantially completely closed closed pipe circuit or loop pipe circuit. The adjusting device 50 connected to the hot water circulation circuit reduces the fluid pressure in the hot water supply header 31 when the volume of hot water circulating in the hot water circulation circuit is reduced due to a change in the temperature of the hot water or unintended leakage of hot water. Make-up water is injected into the hot water circulation circuit to detect and compensate for the reduction in hot water capacity. Therefore, the hot water circulation circuit constitutes a closed piping system that circulates a substantially fixed amount of hot water.
The discharge capacity (discharge amount and total head) of the warm water pump P arranged in the warm water circulation circuit is determined by the friction loss head of the pipeline, the bend pipe,
It is determined based on the total loss of head such as check valve, sluice valve, strainer, and pressure loss such as speed loss of suction port and discharge port. The required heating capacity of the floor heating apparatus 1 is designed based on the floor heating area, the heating set temperature, the outside air temperature condition, the amount of heat storage, etc., and the hot water flow rate to be circulated to the floor heating apparatus 1 is determined based on the required heating capacity. To be done. Generally, as described above, the pipeline assembly 10 constituting the floor heating system 1 has a large number of pipelines having a relatively small diameter and a long length (for example, an internal diameter of 10 to 20 mm and a pipeline length of 3).
0 to 50 m), the discharge pressure of the hot water pump P is designed to be relatively high in order to secure a desired hot water flow rate that is substantially inversely proportional to the length and proportional to the differential pressure of the pipeline. The pressure on the suction side of the hot water pump P must be set to a positive pressure (plus pressure) or a positive pressure. However,
In the hot water circulation circuit of this example, the fluid pressure of the hot water supply pipe 20 shown by the solid line in FIG. 3 is set to a positive pressure (plus pressure), and the fluid pressure is a negative pressure (in the intermediate region of the conduit assembly 10). (Negative pressure) or negative pressure, and the return pipe path shown by the dotted line in FIG. 3, that is, the hot water return pipe 30 to the suction pipe 34.
The fluid pressure of the piping path leading to the is set to a negative pressure (negative pressure). The extrusion side pressure of the hot water pump P is set to a desired pressure exceeding atmospheric pressure, for example, 2.0 kg, and the suction side pressure of the hot water pump P is set to a predetermined value below atmospheric pressure, for example, 0.7 kg. It Such a pressure setting results in applying a negative pressure fluid pipe system that could not be used in the conventional piping route to the reflux pipe of the closed pipe (hot water circulation circuit). It was found that the hot water circulation circuit smoothly circulated.

Further, since a heating device such as a boiler has a built-in hot water heating coil having a relatively large conduit resistance, it is generally the extruding side of the hot water pump, that is, the discharge port of the hot water pump and the heat exchange of the floor heating device. It is arranged between the device and the device. However, in the hot water circulation circuit of the present example, the wheeler B is arranged on the suction side of the hot water pump P, that is, between the suction port of the hot water pump P and the floor heating device 1. In addition, since the fluid pressure of the hot water heating coil 40 of the boiler B is set to a negative pressure, the hot water recirculation header 3 located upstream of the boiler B.
It becomes possible to connect the hot water circulation amount adjusting device 50 to 1, so that the makeup water can be supplied to the hot water circulation circuit relatively easily (unlike the mode in which the makeup water is pushed into the positive pressure fluid). it can. If the air venting means is provided in the piping path set to the negative pressure, that is, the piping path from the hot water return pipe 30 to the suction pipe 34, the negative pressure in the piping path may cause the atmospheric air to flow back into the pipeline. is there. Therefore, it is desirable to provide a special air bleed valve provided with a backflow prevention means in the piping path, or to dispose the air bleed valve in the hot water supply pipe 20 set to a positive pressure. Next, the operation of the hot water piping system and the hot water floor heating apparatus configured as described above will be described.

The high temperature water heated by the hot water boiler B is
Due to the suction pressure of each hot water pump P, it flows into the hot water supply header 21 through the hot water feed pipe 33, and is sucked into the suction port of each hot water pump P through the hot water supply header 21. Each hot water pump P pressure-feeds the sucked high-temperature water to the hot-water supply pipe 20, and feeds it to the pipe line assembly 10 in each floor heating area 7. The high-temperature water that has passed through each of the pipelines 12 of the pipeline assembly 10 is cooled by heat exchange between the pipe wall of the pipeline 12 and the floor base material 3, and is sent to the hot water return pipe 30. The floor base material 3 to which the heat quantity of the high-temperature water is transmitted raises the surface temperature of the floor finish material 4, and the floor finish material 4 exhibits a floor heating effect. The low-temperature water sent from the pipe line assembly 10 to each hot-water reflux pipe 30 flows into the hot-water reflux header 31, joins at the hot-water reflux header 31, and heats the hot-water boiler B via the cold-water feed pipe 32. It flows into the coil 40. The hot water heated in the hot water boiler B is sucked into the hot water pump P via the hot water feed pipe 33 and the hot water supply header 21 as described above.
In the floor heating apparatus including the hot water piping system configured as described above, the fluid pressure of the hot water supply pipe 20 is set to a positive pressure (plus pressure), and the fluid pressure is a negative pressure (in the intermediate region of the pipe assembly 10). The pressure of the fluid is changed to a negative pressure, and the fluid pressure in the pipe path from the hot water return pipe 30 to the suction pipe 34 is set to a negative pressure. In the above hot water piping system, hot water smoothly circulates in the hot water circulation circuit by such a special pressure setting. Therefore, according to the above hot water piping system, the discharge pressure of the hot water pump P can be reduced, and the head, capacity, power consumption, etc. of the hot water pump P can be reduced.

FIG. 4 is a piping circuit diagram of a hot water piping system according to a second embodiment of the present invention. The first end 10a of the pipe line assembly 10 laid in each floor heating area 7 is the hot water supply pipe 2
0 (shown by a solid line), and the hot water supply pipe 20 is connected to a hot water main pipe 25 (shown by a solid line). The base end or upstream end of the hot water main pipe 25 is connected to the discharge port of the hot water pump P. In addition, the second end 1 of the duct assembly 10 in each floor heating area 7
0b is connected to the hot water return pipe 30 (shown by a dotted line), and the hot water return pipe 20 is connected to a return main pipe 35 (shown by a dotted line). The end or downstream end of the hot water return main pipe 35 is
It is connected to the inlet 41 of the hot water heating coil 40 of the hot water boiler B. The outlet 42 of the hot water heating coil 40 is connected to the suction port 42 of the hot water pump P via the suction pipe 34. In this example, the heating coil 40 of the hot water boiler B
The high-temperature water sent out from each of the hot water pumps P is sucked into the suction port of the hot water pump P through the suction pipe 34 by the suction pressure of each hot water pump P. The hot water pump P is for supplying hot water to the hot water main pipe 2
5 and the hot water supply pipes 20 and the pipes 10 in each floor heating area 7. Each conduit 12 of the conduit assembly 10
As described above, the high-temperature water that has been passed through is cooled by the heat exchange action with the floor base material 3, heats the floor finish material 4, is sent to each hot water return pipe 30, and is further passed through the return main pipe 35. And flows into the heating coil 40 of the hot water boiler B.

Further, the hot water heating coil 4 is arranged in the negative pressure piping system (shown by the dotted line), and accordingly, the negative pressure fluid is passed through.
0 indicates that when negative fluid pressure, which is not generally considered in design, acts on the coil pipe wall, and when the circulating hot water amount or hot water volume is insufficient due to changes in water temperature or the like, the negative pressure of the heating coil 40 is further increased. Acts on the wall. However, the hot water replenishing device 52 is connected to the pipe region of the hot water heating coil 40, and the hot water replenishing device 52 uses the pressure compensation valve 53 and the hot water replenishing pipe 54 that automatically adjust the hot water circulation amount of the entire hot water pipe system. The hot water supply device 52 includes the hot water coil 40.
Is automatically supplied to compensate for the drop in fluid pressure in the hot water coil 40. Therefore, the damage or breakage of the heating coil 40 due to the negative fluid pressure can be reliably avoided.

[0017]

As described above, it is possible to provide an air conditioning piping system capable of reducing the equipment capacity of a fluid pumping device such as a hot water pump in air conditioning equipment.

[Brief description of drawings]

FIG. 1 is a schematic sectional view of a hot water floor heating apparatus to which an air conditioning piping system according to a first embodiment of the present invention is applied.

FIG. 2 is a perspective view and a partially enlarged cross-sectional view of the conduit assembly shown in FIG.

FIG. 3 is a piping circuit diagram of the hot water piping system according to the first embodiment of the present invention.

FIG. 4 is a piping circuit diagram of a hot water piping system according to a second embodiment of the present invention.

[Explanation of symbols]

 1 Floor Heating Device 2 Floor Substrate 7 Floor Heating Area 10 Pipeline Assembly 12 Pipeline 13 Fluid Passage 14 Substrate 20 Hot Water Supply Pipe 21 Hot Water Supply Header 30 Hot Water Reflux Pipe 31 Hot Water Reflux Header 32 Low Temperature Water Supply Pipe 33 High Temperature Water Supply Sending pipe 34 Suction pipe 40 Hot water heating coil 41 Inlet 42 Outlet 50 Hot water circulation adjustment device 51 Hot water supply pipe 52 Hot water supply device P Hot water pump B Hot water boiler

Claims (3)

[Claims] 1. An air-conditioning heat source, a heat-medium fluid piping circuit for circulating an air-conditioning heat medium of the air-conditioning heat source to air-conditioning equipment, and a fluid pressure pump for pumping the heat-medium fluid to the heat medium piping. In an air conditioning piping system that entirely forms an electrically closed loop piping circuit, the fluid pressure of a heat medium supply pipeline that connects the air conditioning equipment and the discharge port of the pump is set to a positive pressure, and the air conditioning equipment is And a suction port of the pump, the fluid pressure of the heat medium return pipeline is set to a negative pressure, and the fluid of the heat medium return pipeline is fed by the suction negative pressure of the pump. And air conditioning piping system. 2. The air conditioning heat source is a hot water heat source, the heat medium fluid is hot water, the hot water heat source is interposed in the heat medium return conduit, and hot water supply means is connected to the return conduit. The air conditioning piping system according to claim 1, wherein the air conditioning piping system is provided. 3. The floor heating device, wherein the air conditioner is a floor heating device constructed by embedding a conduit assembly, which is an assembly of a plurality of conduits arranged in parallel at a distance, in a self-leveling material, The conduit assembly includes a substrate extending between the conduits and interconnecting adjacent conduits, the conduit assembly being laid on a floor base and covered with the self-leveling material. A first end of the conduit assembly is connected to the heat medium supply conduit, a second end of the conduit assembly is connected to the heat medium return conduit, and the heat medium supply conduit is 3. The air-conditioning pipe according to claim 1, wherein the positive pressure is converted into a negative pressure in the pipeline assembly, and a negative fluid pressure is formed at the second end of the pipeline assembly. system.