JP2721406B2 - Load handling mechanism in heat pump air conditioner - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a load response mechanism in a heat pump cooling / heating device.

(Related Art) For example, in a hotel or a building having a computer room, a cooling load and a heating load may coexist, and a cooling and heating device capable of simultaneously supplying cooling water for cooling and hot water for heating is required.

Conventionally, such a cooling and heating apparatus is connected to a heat exchanger d and a hot water heat source e of a cold water circulation path c leading to a cold water heat source b, for example, as shown in FIG. 6, for each of a plurality of indoor units a ₁ and a _2. A heat exchanger g for the hot water circulation path f is provided. The cold water heat source b and the hot water heat source e are each constituted by an independent heat source device, or each is constituted by a low-temperature heat absorbing section and a high-temperature heat radiating section of a heat pump.

(Problems to be Solved by the Invention) In the former heat source configuration, the cost and the space are increased, and in the latter heat source configuration, the ratio of the cooling and heating loads is fixed, and the variation of the load ratio is coped with. There is a problem that cannot be done.

An object of the present invention is to solve such a problem.

(Means for Solving the Problems) The structure of the present invention for solving the above problems will be described with reference to FIGS. 1 to 5 corresponding to the embodiment. Heat absorbing part 2c and high temperature heat absorbing part 2h
In each of the cold water path 4c and the hot water path 4h passing through the heat exchangers 3c and 3h, bypass paths 6c and 6h are formed via flow path switching means 5c and 5h, respectively, and in the cold water path 4c and the hot water path 4h. The outdoor heat radiation paths 8c, 8h and the direct paths 9c, 9h are arranged in parallel with the downstream sides of the bypass paths 6c, 6h and the heat exchangers 3c, 3h via the three-way valves 7c, 7h, respectively. Heat dissipation path 8c,
8h is configured to be connected to the common outdoor heat exchanger 11 via the three-way valve 10.

In the above configuration, the flow path switching means 5c and 5h are connected to the heat exchanger 3.
The flow of cold water and hot water from c and 3h is transferred to the load side paths 12c and 12h.
And a valve that simply switches to the bypass paths 6c and 6h, and a valve configured to adjust the flow rate on the bypass paths 6c and 6h.

(Operation and Example) FIGS. 1 to 5 showing the operation of the above-mentioned present invention in an embodiment.
This will be described with reference to the drawings.

First, when only cooling is performed, the flow path switching means 5c of the chilled water path 4c is switched so as to flow chilled water only to the load side path 12c as shown by hatching in FIG. The valve 7c switches to the direct passage 9c. On the other hand, the flow path switching means 5h of the hot water path 4h switches the hot water to the bypass path 6h side and switches the three-way valves 7h and 10 to the outdoor heat radiation path 8h side as shown by hatching in the figure.

When the heat pump 1 is operated in the above state and the cold water and hot water circulation pumps 13c and 13h provided in appropriate locations are operated, first, the cold water cooled in the heat exchanger 3c of the low temperature heat absorbing section 2c is cooled water. The air flows through the path 4c, passes through the path 12c from the flow path switching means 5c, passes through the heat exchanger 15c on the cooling load side 14, is provided for cooling, and is returned to the chilled water path 4c. The refluxed cold water is
The heat is returned from the three-way valve 7c to the heat exchanger 3c via the direct passage 9c, and is cooled again in the heat exchanger 3c and provided for circulation.

On the other hand, the hot water heated in the heat exchanger 3h of the high-temperature radiator 2h flows through the hot water path 4h, passes from the flow path switching unit 5h through the bypass path 6h, flows into the outdoor heat release path 8h via the three-way valve 7h. . In this way, the hot water flows through the outdoor heat radiating path 8h, radiates heat to the outside air in the outdoor heat exchanger 11, returns to the hot water path 4h from the outdoor heat radiating path 8h via the three-way valve 10, and returns to the heat exchanger 3h. In the heat exchanger 3h, the heat of the high-temperature radiating section 2h is taken out and used for circulation. As described above, the heat taken from the room or the like in the heat exchanger 3h on the cooling load side 14c is radiated to the low-temperature heat absorbing section 2c in the heat exchanger 3c and generated in the high-temperature heat radiating section 2h. By radiating heat to the outside air in the outdoor heat exchanger 11, cooling can be performed.

Next, in the case where only heating is performed, as shown in FIG. 2, the flow path switching means 5h of the hot water path 4h flows hot water only to the load side path 12h as shown by hatching in the figure, as shown in FIG. And the three-way valve 7h is switched to the direct communication path 9h. On the other hand, the flow path switching means 5c of the cold water path 4c switches the hot water to the bypass path 6c side and switches the three-way valves 7c and 10 to the outdoor heat radiation path 8c side as shown by hatching in the figure.

By the above switching operation, the low-temperature heat absorbing portion 2c reaches the three-way valve 7c from the heat exchanger 3c via the chilled water path 4c, the flow path switching means 5c, the bypass path 6c, and the chilled water path 4c, and radiates outdoor heat from the three-way valve 7c. A cold water circulation path that returns to the heat exchanger 3c via the path 8c, the outdoor exchanger 11, the three-way valve 10, the outdoor heat radiation path 8c, and the cold water path 4c is configured. On the other hand, with respect to the high-temperature radiating section 2h, the heat exchanger 3h passes through the hot water path 4h to reach the flow path switching means 5h, and from the flow path switching means 5h through the path 12h, the heating load side 1h.
4h of the heat exchanger 15h, and from the heat exchanger 15h, the route 12
h, a hot water circulation path that returns to the heat exchanger 3h through the hot water path 4h, the three-way valve 7h, the direct communication path 9h, and the hot water path 4h is configured.
Thus, the heat taken from the outside air in the outdoor heat exchanger 11 is radiated in the low-temperature radiating section 2c of the heat pump 1, and the heat generated in the high-temperature radiating section 2h is transferred to the heating load side 14h.
By radiating heat in the heat exchanger 15h, it is possible to heat a room or the like.

Next, as shown in FIG. 3, the low-temperature heat absorbing section 2c forms a cold water circulation path as shown in FIG. 1, and the high-temperature heat radiation section 2h forms a hot water circulation path as shown in FIG. Thus, the heat taken from the room or the like in the heat exchanger 15c on the cooling load side 14c is radiated in the low-temperature heat absorbing section 2c of the heat pump 1, and the heat generated in the high-temperature heat radiating section 2h is transferred to the heating load. The heat can be dissipated in the heat exchanger 15h on the side 14h, so that cooling can be performed on the cooling load side 14c and heating can be performed on the heating load side 14h.

The above operation does not cause any problem when the heating and cooling loads are balanced, but when the balance is lost, they adversely affect each other. For example, when the heating load is small and the balance is lost, the heat generated in the high-temperature heat radiating section 2h cannot be sufficiently radiated, so that the low-temperature heat absorbing section 2c cannot efficiently absorb heat from the cold water. When the balance is small, the low-temperature heat-absorbing section 2c cannot absorb heat sufficiently from cold water, so that heat cannot be efficiently generated in the high-temperature radiating section 2h.

Therefore, in the present invention, for example, when the heating load is small and the balance is lost in the state shown in FIG. 3, the three-way valves 7h and 10 are switched to the outdoor heat dissipation path 8h as shown in FIG. In such a state, the hot water that has returned to the downstream side of the hot water path 4h via the heat exchanger 15h on the heating load side 14h is
From the three-way valve 7h, it enters the outdoor heat dissipation path 8h, passes through the outdoor heat exchanger 11, and returns from the three-way valve 10 to the heat exchanger 3h via the outdoor heat dissipation path 8h and the hot water path 4h. In this way, the hot water that has passed through the heat exchanger 15h returns to the heat exchanger 3h after passing through the outdoor heat exchanger 11, so that the heating load is small, and the heat radiation in the heat exchanger 15h on the heating load side 14h is reduced. Even in the case where the heat is insufficient, the heat can be radiated to the outside air in the outdoor heat exchanger 11, and the balance between the heat in the low-temperature heat absorbing section 2c and the high-temperature heat radiating section 2h can be maintained.

Contrary to the above, when the cooling load is small and the balance is lost in the state of FIG. 3, the three-way valve 7c is switched to the outdoor heat radiation path 8c side as shown in FIG.
Maintains the outdoor heat dissipation path 8c side. In this state, the cold water that has returned to the downstream side of the cold water path 4c through the heat exchanger 15c on the cooling load side 14c enters the outdoor heat radiation path 8c from the three-way valve 7c, passes through the outdoor heat exchanger 11, and passes through the outdoor heat exchanger 11. It returns from the valve 10 to the heat exchanger 3c via the outdoor heat radiation path 8c and the cold water path 4c. As described above, since the cold water that has passed through the heat exchanger 15c on the cooling load side 14c returns to the heat exchanger 2c after passing through the outdoor heat exchanger 11, even when the heat absorption in the heat exchanger 15c is insufficient. Then, the heat of the outside air can be removed in the outdoor heat exchanger 11, and thus the balance between the heat in the low-temperature heat absorbing section 2c and the high-temperature heat radiating section 2h can be maintained. In the operation shown in FIGS. 4 and 5, the flow path switching means 5c and 5h are used to transfer the flow of cold water and hot water from the heat exchangers 3c and 3h to the load paths 12c and 1h.
In the case of 2h and a valve that simply switches to the bypass paths 6c and 6h, cold water and hot water all flow to the paths 12c and 12h, and flow rates in the heat exchangers 15c and 15h on the load sides 14c and 14h. By a suitable mechanism such as a temperature control mechanism, the load side 14c, 14h
However, in addition to the above, as the flow path switching means 5c, 5h, the bypass paths 6c, 6h
If the flow rate of the side is adjustable, the amount of cold water and hot water passing through the bypass paths 6c and 6h is adjusted via these valves, and the heat exchanger 15 on the load side 14c and 14h is adjusted.
The ratio between the flow rate passing through c and 15h and the flow rate flowing through outdoor heat exchanger 11 can be adjusted. In the figure, the three-way valve
7c and 7h are upstream of the outdoor heat dissipation paths 8c and 8h, and the three-way valve 10
Is configured on the downstream side, but may be configured in a reverse flow.

As described above, the present invention operates the flow path switching means 5c, 5h and the three-way valves 7c, 7h, 10 to perform cooling or heating on either the cooling load side 14c or the heating load side 14h. In addition, the cooling pump 14c and the heating can be performed, and when the balance of the cooling or the heating load is lost in the latter operation, the heat pump 1 is radiated or absorbed by the outdoor heat exchanger 11. The balance of heat in the low-temperature heat-absorbing section 2c and the high-temperature heat-radiating section 2h can be maintained. Therefore, the cooling load side 14c and the heating load side 14h
Together, an appropriate number of heat exchangers can be configured.

In the illustrated example, reference numerals 16c, 16h, and 17 indicate fans.

(Effects of the Invention) As described above, the present invention can configure a cooling and heating device capable of simultaneously supplying cooling water for cooling and hot water for heating with a single heat pump, and can reduce required space and cost. In addition, there is an effect that an efficient operation can be performed in response to a change in the ratio between the cooling and heating loads.

[Brief description of the drawings]

1 to 5 are system explanatory diagrams showing the overall configuration and operation of an embodiment of the device of the present invention, and FIG. 6 is a system explanatory diagram showing an example of a conventional device. Symbol 1 ... heat pump, 2c ... low temperature heat absorbing section, 2h ... high temperature heat radiating section, 3c, 3h ... heat exchanger, 4c ... cold water path, 4h ...
... hot water path, 5c, 5h ... flow path switching means, 6c, 6h ... bypass path, 7c, 7h, 10 ... three-way valve, 8c, 8h ... outdoor radiation path, 9c, 9h ... direct path, 11 …… Outdoor heat exchanger, 12c, 12h
…… Route, 13c, 13h… Circulation pump, 14c… Cooling load side, 14h …… Heating load side, 15c, 15h …… Heat exchanger, 16c, 16
h, 17 …… Fan.

Claims (2)

(57) [Claims] 1. A cold water path and a hot water path passing through a heat exchanger of a low-temperature heat absorbing section and a high-temperature heat absorbing section of a heat pump. In this case, an outdoor heat radiation path and a direct path are configured in parallel between the downstream side of the bypass path and the heat exchanger via a three-way valve, and these outdoor heat radiation paths are shared by a common outdoor heat exchange through a three-way valve. A load response mechanism in a heat pump cooling / heating device, wherein the load response mechanism is configured to be connected to a heater. 2. A load handling mechanism in a heat pump cooling / heating apparatus, wherein the flow path switching means according to claim 1 is configured to adjust a flow rate on a bypass path side.