JP4369841B2 - Heat medium piping system - Google Patents

Description

  The present invention relates to a heat medium piping system for supplying a heat medium such as cold water or hot water in an air conditioning facility such as a building or a factory.

  A plurality of air conditioners are provided in a building such as an office building where a plurality of stores and offices occupy, and a heat medium such as cold water or hot water is supplied to each air conditioner by a pump from a heat source unit. It is supplied at a flow rate corresponding to the heat load, and cooling and heating are performed. Thus, a conventional example of a heat medium piping system provided with such an air conditioner is shown in FIG.

  In FIG. 6, 1 is a heat source device such as a refrigerator or a boiler, 2 is a heat medium forward main line connected to the outlet side of the heat source device 1 and supplied with a heat medium such as cold water or hot water, 3 is a heat medium A plurality of heat medium outgoing pipes 4 branching from the outgoing main pipe 2 are connected to the respective heat medium outgoing pipes 3 on the inlet side, and are arranged in parallel with each other, and 5 is an outlet side of each air conditioner 4 The heat medium return pipes 6 connected to each other are connected so that the respective heat medium return pipes 5 merge, the heat medium return main pipe connected to the inlet side of the heat source unit 1, and 7 the heat medium forward main pipe On the path 2 side, it is connected to the heat medium forward main line 2 on the upstream side in the heat medium flow direction from the air conditioner 4 on the most heat source apparatus 1 side, and on the heat medium return main line 6 side on the most heat source apparatus 1 side. It is a bypass line connected to the heat medium return main line 6 on the downstream side in the heat medium flow direction from the air conditioner 4.

  A heat source pump 8 is connected to the heat medium forward main line 2 on the heat source unit 1 side of the bypass line 7 relative to the connection position of the heat medium forward main line 2, and the heat medium forward pipe on the most upstream side in the heat medium flow direction. A heat medium pump 9 is connected on the bypass line 7 side of the connection position of the line 3, and each heat medium return line 5 is provided with a flow rate control valve 10.

  In the system shown in FIG. 6, the heat medium cooled or heated and sent from the heat source unit 1 is sent to the heat medium forward main line 2 by the heat source pump 8, and a part of the heat medium passes through the bypass line 7. And flows into the heat medium return main pipe 6.

  Further, the remaining heat medium is further fed through the heat medium forward main line 2 by the heat medium pump 9 and is introduced from the heat medium forward line 3 to the air conditioner 4 to consume cold or hot heat, and the heat medium return line. 5 flows into the heat medium return main line 6 and returns to the heat source unit 1 together with the heat medium from the bypass line 7. At this time, the flow rate of the heat medium passing through the air conditioner 4 is controlled by the flow control valve 10 so that the target space has a predetermined temperature by the air supplied to the target space through the air conditioner 4.

  Another conventional example of a heat medium piping system provided with an air conditioner is shown in Patent Document 1 and is shown in FIG. In the example of FIG. 7, the heat medium forward main line 2 is not provided with the heat source pump 8 or the heat medium pump 9 shown in FIG. 6, and the bypass line 7 is not provided. There is provided a heat medium pump 11 capable of controlling the number of revolutions. In FIG. 7, the same components as those shown in FIG. 6 are denoted by the same reference numerals.

In the case of FIG. 7, the heat medium from the heat source device 1 is introduced to the heat medium pump 11 via the heat medium forward main line 2 and the heat medium forward line 3, and from the heat medium pump 11 via the heat medium forward line 3. It is fed to the air conditioner 4, consumes cold or heat, passes through the heat medium return pipe 5, is fed to the heat medium return main pipe 6, and returns to the heat source machine 1 through the heat medium return main pipe 6. At this time, the heat medium passing through the air conditioner 4 is subjected to inverter control of the rotation speed of the heat medium pump 11 so that the target space has a predetermined temperature by the air supplied to the target space through the air conditioner 4. The flow rate is controlled.
Japanese Patent No. 3490986

  In the heat medium piping system shown in FIG. 6, since the flow control of the heat medium is performed by adjusting the opening degree of the flow control valve 10, a pressure loss due to the flow resistance always occurs in the flow of the heat medium passing through the flow control valve 10, As a result, the power consumption of the heat medium pump 9 is increased, and the heat source pump 8 is also required for bypassing the bypass pipe 7 for the heat medium not supplied to the air conditioner 4. As a result, the system shown in FIG. 6 is disadvantageous in terms of energy saving because the conveyance power of the heat medium increases.

  In the heat medium piping system of Patent Document 1 shown in FIG. 7, the flow control of the heat medium is performed by controlling the number of rotations of the heat medium pump based on the flow rate of the heat medium required by each air conditioner 4. As compared with the case of 6, the conveyance power of the heat medium can be reduced. However, since the heat medium is transported only by the heat medium pump 11, for example, even if the required heat medium flow rate on the air conditioner 4 side almost disappears, the minimum flow rate for avoiding problems such as freezing of the heat source device 1 is In that case, in order to secure the flow rate of the heat medium through the air conditioner 1, the pressure loss of the heat exchanger of the air conditioner 4 and the piping resistance to the air conditioner 4 are added, and the heat medium There is a problem that it is difficult to sufficiently reduce the conveyance power.

  An object of the present invention is to provide a heat medium piping system that can reduce the heat transfer power of the heat medium and that can control the heat source device and the air conditioner most efficiently in view of the above-described circumstances. It was made as.

The heat medium piping system according to claim 1 is:
A heat source machine loop, a plurality of air conditioner loops, and a heat transfer loop connecting the heat source machine loop and each air conditioner loop,
The heat source machine loop
A heat source device, a heat source pump, a first heat medium return pipe for supplying the heat medium from the heat transfer loop to the heat source device, and a first heat for supplying the heat medium from the heat source device to the heat transfer loop. And the heat source pump is provided in the first heat medium return pipe or the first heat medium forward pipe,
Air conditioner loop
An air conditioner, an air conditioner pump, a second heat medium forward pipe that supplies the heat medium from the heat transfer loop to the air conditioner, and a second heat medium that supplies the heat medium from the air conditioner to the heat transfer loop. A heat medium return pipe, and the air conditioner pump is provided in the second heat medium forward pipe or the second heat medium return pipe,
The heat transfer loop
A heat medium circulation pump, and a heat medium circulation pipe provided with the heat medium circulation pump to which the heat medium is supplied,
The plurality of air conditioner loops are sequentially disposed from the upstream side to the downstream side in the heat medium flow direction along the heat medium circulation pipe of the heat transfer loop,
The heat medium circulation pipe of the heat transfer loop is such that the second heat medium return pipe of each air conditioner loop is downstream of the second heat medium forward pipe of the air conditioner loop in the heat medium flow direction. Connected to
The second heat medium forward pipe of the air conditioner loop downstream of the predetermined air conditioner loop in the heat medium flow direction is a second air medium loop upstream of the air conditioner loop downstream of the heat medium flow direction. so as to be positioned to the heat medium flow direction downstream side of the heat medium Kaekanro, those which are connected to the heat medium circulation conduit of the heat transport loop.

In the heat medium piping system according to claim 2, a plurality of heat source machine loops are installed, and a first heat medium return pipe for supplying the heat medium from the heat transfer loop to the heat source machine in a predetermined heat source machine loop; and The first heat medium forward pipe for supplying the heat medium from the heat source device to the heat transfer loop is connected between the air conditioner loop connection portions of the heat medium circulation pipe in the heat transfer loop.

In the heat medium piping system of claim 3,
Each of the air conditioner loops other than the air conditioner loop located on the most downstream side in the heat medium flow direction has a bypass pipe line,
The bypass line is
One end is connected to the second heat medium return pipe in the air conditioner loop other than the air conditioner loop located on the most downstream side in the heat medium flow direction,
The other end is connected to the heat medium circulation line of the heat transfer loop on the downstream side of the second heat medium return line connection part of the air conditioner loop located on the most downstream side in the heat medium flow direction,
The second heat medium return pipe in the air conditioner loop is provided with a first valve means so as to be located on the downstream side in the heat medium flow direction from the bypass pipe connection position of the second heat medium return pipe. ,
The bypass line in which the second valve means is provided.

The heat medium piping system according to claim 4 is:
If the heat load is lower than a predetermined value, opening a first valve means, and, closing the second valve means,
When the heat load is a predetermined value or more, the first valve means is closed and the second valve means is opened.

  In the heat medium piping system according to the fifth aspect, the heat source pump, the air conditioner pump, and the heat medium circulation pump are configured to be capable of controlling the rotational speed.

  According to the heat medium piping system according to the first to fifth aspects of the present invention, each device is made efficient between each heat source loop, each air conditioner loop, and each heat transfer loop without being interfered with each other. It is possible to operate well, and in order to ensure the necessary heat medium flow rate in each device, various dedicated pumps located at the same level of height ensure the heat medium flow rate, which is wasteful in the head. Therefore, it is possible to reduce the heat transfer power of the heat medium, and to control the heat source unit and the air conditioner most efficiently. Since it connects between the air conditioner loops of a pipe line, it becomes possible to make low the temperature of the heat medium of the air conditioner inlet in the air conditioner loop downstream from the said connection part, and also the heat medium of Claim 3 Piping The stem can be avoided the temperature change of the heat medium introduced into the air conditioner loop can achieve equal various excellent effects.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is an example of an embodiment of a heat medium piping system of the present invention. Thus, in the illustrated example, the heat medium piping system is divided into a heat source machine loop A, an air conditioner loop B, and a heat transfer loop C, and a plurality of air conditioner loops B are provided. The air conditioner loop B is connected by a heat transfer loop C.

  That is, the heat source unit loop A includes the heat source unit 1, the heat source pump 12, the heat medium forward pipe 13a, and the heat medium return pipe 13b, and the heat source pump 12 is provided in the heat medium return pipe 13b. . The air conditioner loop B includes an air conditioner 4, an air conditioner pump 14, a heat medium forward duct 15a, and a heat medium return duct 15b, and the heat medium forward duct 15a is provided with the air conditioner pump 14. . The heat transfer loop C includes a heat medium circulation pump 16 and an endless heat medium circulation pipe 17 provided with the heat medium circulation pump 16.

  Thus, the other end of the heat medium forward pipe line 13a having one end connected to the heat source machine loop A outlet side of the heat source machine loop A is connected to the heat medium circulation pump 16 in the heat transfer loop C. The other end of the heat medium return pipe 13b connected to the upstream side of the heat medium flow direction and connected to the heat source machine 1 inlet side of the heat source machine loop A is the heat medium circulation pipe 17 in the heat transfer loop C. It is connected to the upstream side in the heat medium flow direction from the connection position of the heat medium forward pipe 13a.

  The plurality of air conditioner loops B are located downstream from the upstream side in the heat medium flow direction 17 with respect to the heat medium circulation line 17 on the downstream side in the heat medium flow direction from the connection position of the heat medium circulation pump 16 in the heat medium circulation line 17 It is connected sequentially toward. That is, the other end of the heat medium forward line 15a, one end of which is connected to the air conditioner 4 inlet side of the air conditioner loop B, is connected to the heat medium circulation line 17, and the other end is the air conditioner 4 outlet side of the air conditioner loop B. The other end of the heat medium return pipe 15b connected to is connected to the heat medium circulation pipe 17 on the downstream side in the heat medium flow direction with respect to the heat medium forward pipe 15a connection portion. Thus, the connection position of the heat medium forward line 15 a on the most upstream side in the heat medium flow direction with respect to the heat medium circulation line 17 is located downstream of the heat medium circulation pump 16 in the heat medium flow direction.

  All of the heat source pump 12, the air conditioner pump 14, and the heat medium circulation pump 16 can perform pump rotation speed control by inverter control.

Next, the operation of the illustrated example will be described.
The heat medium circulated through the heat medium circulation pipe 17 of the heat transfer loop C and fed from the heat medium return pipe 13b of the heat source machine loop A to the heat source machine 1 by the heat source pump 12 is cooled or heated in the heat source machine 1. The cooled or heated heat medium flows through the heat medium forward line 13a and is supplied to the heat medium circulation line 17, and the heat medium circulation line 17 is upstream of the connecting portion of the heat medium forward line 13a. The heat medium circulated and fed from the side joins, is fed to the downstream side through the heat medium circulation pipe 17, and is pressurized by the heat medium circulation pump 16 to further move the heat medium circulation pipe 17 further downstream. Be sent.

  Thus, a part of the heat medium flows into the heat medium forward line 15a of the air conditioner loop B and is fed through the heat medium forward line 15a, and is fed from the air conditioner pump 14 to the air conditioner 4 for air conditioning. In the machine 4, work is done by consuming cold or hot heat, and the heat medium whose temperature has risen or lowered is fed to the heat medium return pipe 15b and flows into the heat medium circulation pipe 17 and is sequentially fed downstream. Then, it merges with the heat medium from the other air conditioner loop B, flows through the heat medium circulation pipe 17 and is fed to the heat source apparatus loop A side, and a part of the heat medium is returned to the heat medium of the heat source apparatus loop A. The remaining heat medium flows into the pipe line 13b, joins with the heat medium from the heat medium forward pipe line 13a in the heat medium circulation pipe line 17, and circulates through the aforementioned path.

  In the illustrated example, the heat source machine loop A, the plurality of air conditioner loops B, and the heat transfer loop C connecting the heat source machine loop A and each air conditioner loop B are provided independently, and the heat source machine loop A is provided in the heat source machine loop A. A heat source pump 12, an air conditioner pump 14 is provided in each air conditioner loop B, and a heat medium circulation pump 16 is provided in the heat transfer loop C. The heat source pump 12, the air conditioner pump 14, and the heat medium circulation pump 16 rotate. It is configured to be able to control the number.

  For this reason, even if the flow rate of the air conditioner pump 14 in the air conditioner loop B becomes the minimum flow rate and the temperature difference between the heat medium at the inlet and outlet of the air conditioner 4 becomes small, in the plurality of air conditioner loops B, The heat medium return pipe 15b is sequentially connected to the heat medium circulation pipe 17 on the downstream side of the connecting portion of the heat medium forward pipe 15a, and the flow rate of the heat medium circulation pump 16 in the heat transfer loop C is changed. By controlling, it is between the most downstream point of the connection part of the heat medium forward line 15a with respect to the heat medium circulation line 17 and the most downstream point of the heat medium return line 15b with respect to the heat medium circulation line 17. It is possible to increase the temperature difference of the heat medium, and to ensure the temperature difference of the heat medium in the heat source unit 1.

  Therefore, between the heat source loop A, each air conditioner loop B, and the heat transfer loop C, it is possible to operate each device efficiently between the loops A, B, C without receiving interference with each other. It becomes possible to reduce the conveyance power of the heat medium and to control the heat source unit 1 and the air conditioner 4 most efficiently.

  Next, for securing the temperature difference between the outlet and the inlet of the heat source unit 1 and the air conditioner 4 at the time of a low heat load in the heat medium piping system of the illustrated example and the heat medium piping system of Patent Document 1 shown in FIG. The case of cooling will be described based on FIGS. 2 (A) and 2 (B). That is, when the pump reaches the minimum flow rate during the low heat load of the air conditioner 4, the temperature difference between the inlet and the outlet of the air conditioner 4 becomes small. 2A and 2B, the temperature difference Δt2 = 3 ° C. between the inlet and outlet of the air conditioner 4 and the total heat load of each air conditioner 4 ΣQ = 1200 Kcal / min (heat load per one air conditioner 4) Q = 300 Kcal / min) and the comparison was made under the same conditions.

  In the case of the heat medium piping system of FIG. 7, the flow rate of the heat medium main pipe 2 which is the main line is F1 = 400 L / min, whereas in the case of this illustrated example, the heat medium circulation pipe which is the main line. The flow rate of the path 17 may be as small as F1 = 240 L / min. In addition, the temperature difference between the heat medium at the inlet and the outlet of the heat source unit 1 is as small as Δt1 = 3 ° C. in the prior art, but in the example shown in the figure, Δt1 = 5 ° C. be able to. In view of these points, the illustrated example can reduce the heat transfer power and heat source power and has a higher energy saving effect than the system shown in FIG.

  2A and 2B, the flow rate of the heat medium passing through each air conditioner 4 is F2 = 100 L / min, and in FIG. 2B, the flow rate of the heat medium circulating through the heat source unit 1 is F = 240 L / min. min.

  Also, the numerical values described in each air conditioner 4 part in FIG. 2A are the heat medium temperatures at the inlet and outlet of each air conditioner 4, 7 ° C. at the inlet, and 10 ° C. at the outlet. The numerical value described in the air conditioner 4 portion of each air conditioner loop in (B) is the heat medium temperature at the inlet and outlet of each air conditioner 4 and is the first air conditioner loop as seen from the heat source unit 1 side. In, the inlet is 7 ° C., the outlet is 10 ° C., the second air conditioner loop is 8.25 ° C. at the inlet, the outlet is 11.25 ° C., and the third air conditioner loop is 9 ° at the inlet. .5 ° C, 12.5 ° C at the outlet, 10.75 ° C at the inlet and 13.75 ° C at the outlet in the fourth air conditioner loop. Here, the temperature field on the side of the conditioned air to be heat exchange is sufficiently high, and the heat exchanger in the air conditioner 4 has the necessary capacity so that the same temperature difference can be taken where the temperature field is different. Yes.

  Further, in the heat medium circulation pipe 17 in FIG. 2B, the heat medium flows from the heat medium return pipe 15b of the first air conditioner loop as viewed from the heat source unit 1 side, so that the first The temperature of the heat medium in the heat medium circulation line 17 immediately after exiting from the second air conditioner loop is 8.25 ° C., and the heat medium in the heat medium circulation line 17 immediately after exiting from the second air conditioner loop. The temperature of the heat medium in the heat medium circulation line 17 immediately after exiting from the third air conditioner loop is 10.75 ° C., and immediately after exiting from the fourth air conditioner loop. The temperature of the heat medium in the heat medium circulation pipe 17 is 12 ° C.

  Subsequently, for securing the temperature difference between the outlet and the inlet of the heat source unit 1 and the air conditioner 4 at the time of setting the high temperature difference between the heat medium piping system of the illustrated example and the heat medium piping system shown in FIG. The case of cooling will be described based on A) and (B). That is, in general, in order to reduce the conveyance power of the pump, it is better to decrease the flow rate of the pump and increase the temperature difference of the heat medium at the inlet and outlet of the air conditioner 4. 3A and 3B, the temperature difference Δt2 = 7 ° C. between the inlet and outlet heat medium of the air conditioner 4 and the total heat load ΣQ = 2800 Kcal / min (per system) The heat load Q of the air conditioner 4 was compared under the same condition as Q = 700 Kcal / min).

  In the case of the conventional heat medium piping system, the temperature difference between the heat medium at the inlet and the outlet of the heat source unit 1 is large as Δt1 = 7 ° C. In this heat medium piping system, Δt1 = 5 ° C. and a temperature difference that is generally considered to be highly efficient can be secured. Thereby, in the case of this example of illustration, heat source power can be reduced. Further, the power of the heat source power reduced by the amount of decrease in the temperature difference of Δt1 by 2 ° C. is much larger than the increase of the conveyance power of the heat medium circulation pump 16 and the heat source pump 12. In view of these points, the illustrated example can reduce the heat transfer power and heat source power and has a higher energy saving effect than the system shown in FIG.

  In FIG. 3A, the flow rate of the heat medium circulating through the heat medium forward main line 2 and the heat medium return main line 6 which are the main lines in FIG. 3A is F1 = 400 L / min, and in FIG. The flow rate of the circulating heat medium is F = 560 L / min, the flow rate of the heat medium circulating through the heat medium circulation pipe 17 which is the main line is F1 = 560 L / min, and each air conditioning in FIGS. 3 (A) and 3 (B). The flow rate of the heat medium passing through the machine 4 is F2 = 100 L / min.

  3A is the heat medium temperature at the inlet and outlet of each air conditioner 4, which is 7 ° C. at the inlet and 14 ° C. at the outlet. The numerical value described in the part of each air conditioner 4 in (B) is the temperature of the heat medium at the inlet and outlet of each air conditioner 4, and in the first air conditioner loop as seen from the heat source unit 1 side, 7 ° C at the inlet, 14 ° C at the outlet, 8.25 ° C at the inlet in the second air conditioner loop, 15.25 ° C at the outlet, 9.5 ° C at the inlet in the third air conditioner loop 16.5 ° C at the outlet, 10.75 ° C at the inlet and 17.75 ° C at the outlet in the fourth air conditioner loop.

  Further, in the heat medium circulation pipe 17 in FIG. 3 (B), the heat medium from the heat medium return pipe 15b of the first air conditioner loop as seen from the heat source machine 1 side flows into the first. The temperature of the heat medium in the heat medium circulation line 17 immediately after exiting from the second air conditioner loop is 8.25 ° C., and the heat medium in the heat medium circulation line 17 immediately after exiting from the second air conditioner loop. The temperature of the heat medium in the heat medium circulation line 17 immediately after exiting from the third air conditioner loop is 10.75 ° C., and immediately after exiting from the fourth air conditioner loop. The temperature of the heat medium in the heat medium circulation pipe 17 is 12 ° C.

Next, the capacity reduction of the transport device will be described.
In other words, the pump is usually selected using the performance curve of the pump from the required flow rate and the required head. For example, the pump selection in the case of FIG. 7 is the maximum flow rate and the total head of each air conditioner 4 (heat source machine 1 → heat medium forward main line 2 → heat medium pump 11 → heat medium forward line 3 → air conditioner 4 in FIG. → Heat medium return pipe 5 → Heat medium return main pipe 6 → Total resistance of the line indicated by the heat source unit 1).

  On the other hand, in the example shown in the figure, the head of the air conditioner pump 14 is lifted by the head of the air conditioner loop B in FIG. 1 (heat medium forward line 15a → air conditioner pump 14 → air conditioner 4 → heat medium return line 15b. Therefore, even if the maximum flow rate is the same as that of the heat medium pump 11 in FIG. 7, the required head is reduced, so that the capacity of the air conditioner pump 14 is reduced. At the same time, the capacity of the pump rotation speed control means can be reduced. Moreover, since the capacity | capacitance pump 14 has a small capacity | capacitance, the controllability at the time of low load is favorable. Furthermore, since the total lift of the line in FIG. 7 increases as the building scale increases as in a skyscraper, the illustrated example is more advantageous from the viewpoint of pump capacity. Also, in general, a pump with a low head is advantageous because it is more efficient than a pump with a high head.

  FIG. 4 shows another example of the embodiment of the present invention. Thus, in the illustrated example, a plurality of heat source machine loops A including the heat source machine 1 are provided, and in the predetermined heat source machine loop A, the heat medium forward pipe 13a and the heat medium return pipe 13b are provided with predetermined air conditioning. Between the machine loops B and B, the heat transfer loop C is connected to the heat medium circulation pipe 17.

  In each air conditioner loop B in the heat medium piping system of FIG. 1, in the case of cooling, as shown in FIGS. 2 (B) and 3 (B), the heat medium is sent from the heat medium return pipe 15b of the air conditioner loop. By flowing into the heat medium circulation pipe 17, the temperature of the heat medium in the heat medium circulation pipe 17 gradually increases as it goes downstream. However, as shown in the example of FIG. 4, the heat medium forward line 15 a and the heat medium return line 15 b of the predetermined heat source unit loop A are connected between the air conditioner loops B and B and the heat medium circulation line of the heat transfer loop C. By connecting to 17, it is possible to lower the temperature of the heat medium at the inlet of the air conditioner 4 of the air conditioner loop B on the downstream side of this connecting portion.

  FIG. 5 shows still another example of the embodiment of the present invention, which is an example of a heat medium piping system in consideration of the capacity of the refrigerator or boiler, that is, the heat source functioning force and the heat load. In the figure, 18 is a plurality of bypass pipes. One end of each of these bypass pipes 18 is connected to the heat medium return pipe 15b in the air conditioner loop B other than the air conditioner loop B located on the most downstream side in the heat medium flow direction with respect to the heat medium circulation pump 16. In addition, the other end of the heat transfer medium in the heat transfer loop C is located downstream of the connecting portion of the heat medium return pipe 15b of the air conditioner loop B located on the most downstream side in the heat medium flow direction with respect to the heat medium circulation pump 16. It is connected to the circulation line 17.

  In each air conditioner loop B, the switching valve 19 is connected to the downstream side in the heat medium flow direction from the bypass pipe 18 connection position of the heat medium return pipe 15 b, and the switching valve 20 is connected to the bypass pipe 18. ing.

  A flow rate detector 21 is connected between the heat medium outlet line 13 a connection part of the heat medium circulation line 17 and the heat medium circulation pump 16 connection part, and the heat medium circulation pump 16 connection of the heat medium circulation line 17 is connected. The temperature detector 22 is connected between the heat transfer portion 15a and the heat medium flow pipe 15a connecting portion on the most upstream side in the heat medium flow direction, and the bypass line 18 on the most downstream side in the heat medium flow direction of the heat medium circulation line 17 is connected. A temperature detector 23 is connected to the heat medium return pipe 13b side of the connection portion.

  The circulation pump outlet temperature T1 detected by the temperature detector 22, the heat medium return temperature T2 detected by the temperature detector 23, and the circulation pump flow rate Fc of the heat medium detected by the flow rate detector 22 are given to a controller (not shown). The thermal load Qc is obtained by Qc = Fc × (T2−T1), and the obtained thermal load Qc is compared with the heat source functional force × the coefficient α, and switching is performed when the thermal load Qc ≦ the heat source functional force × the coefficient α. An opening command is given to the valve 19, a closing command is given to the switching valve 20, and if thermal load Qc> heat source functional force × coefficient α, an opening command is given to the switching valve 20, and a closing command is given to the switching valve 19 It is like that. The heat source functional power is the rated capacity of the refrigerator or boiler when it is designed, and the coefficient α is a coefficient determined by the use and scale of the building, and is generally 0.9 to 1.0.

  In the illustrated example, when the thermal load Qc <heat source functional force × coefficient α, the switching valve 19 is open and the switching valve 20 is closed, so that the flow of the heat medium is the same as in FIG. However, when thermal load Qc ≧ heat source functional force × coefficient α, the switching valve 19 is closed and the switching valve 20 is opened.

  Therefore, the heat medium that has worked in the air conditioner 4 of the air conditioner loop B passes through the bypass line 18 from the heat medium return pipe 15b and the heat medium return pipe on the most downstream side in the heat medium flow direction in the heat medium circulation pipe 17. As a result, the heat medium sent from the heat medium return pipe 15b of the air conditioner loop B is introduced into the air conditioner loop B on the downstream side in the heat medium flow direction. There is nothing.

  Therefore, since the heat medium cooled or heated to a predetermined temperature by the heat source apparatus 1 of the heat source apparatus loop A is introduced to the air conditioner 4 of each air conditioner loop B, the air conditioner 4 on the downstream side in the heat medium flow direction. It is possible to prevent a temperature rise or a temperature drop of the heat medium introduced into the.

  If the annual maximum cooling load or maximum heating load is lower than the design rated capacity of the refrigerator or boiler, the heat medium piping system shown in FIG. 1 may be used. When the rated capacity at the time of design of the refrigerator or boiler is substantially equal, in the heat medium piping system shown in FIG. 1, the air conditioner loop B on the downstream side in the heat medium flow direction with respect to the heat medium circulation pump 16 is air-conditioned. When the heat load Qc becomes substantially equal to the rated capacity at the time of design of the heat source machine 1 because the temperature of the heat medium supplied to the machine 4 may rise or fall and the heat load process may not be possible. This is to prevent the heat medium sent from the upstream air conditioner loop B from being introduced into the air conditioner loop B on the downstream side to avoid the temperature increase or temperature decrease of the heat medium.

  In addition, this invention is not limited to the above-mentioned embodiment, Of course, a various change can be added in the range which does not deviate from the summary of this invention.

It is a pipe line figure showing an example of an embodiment of a heat carrier piping system of the present invention. FIG. 2 is a pipe diagram for explaining the securing of the temperature difference between the inlet and outlet of the heat source unit and the air conditioner when the heat medium piping system of FIG. 1 and the heat medium piping system of FIG. A) shows the thing of patent document 1, FIG.2 (B) shows the thing of this invention. 1 is a pipeline diagram for explaining the securing of a temperature difference between the inlet and outlet of a heat source unit or an air conditioner when setting a high temperature difference between the heat medium piping system of FIG. 1 and the heat medium piping system of FIG. 3 (A) shows that of Patent Document 1, and FIG. 3 (B) shows that of the present invention. It is a pipe line figure showing other examples of an embodiment of a heat carrier piping system of the present invention. It is a pipe line figure showing other examples of an embodiment of a heat carrier piping system of the present invention. It is a pipe line figure showing an example of the conventional heat carrier piping system. It is a pipe line figure showing other examples of the conventional heat carrier piping system shown in patent documents 1.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Heat source machine 4 Air conditioner 12 Heat source pump 13a Heat-medium outbound pipe (1st heat-medium outbound pipe)
13b Heat medium return pipe (first heat medium return pipe)
14 Air conditioner pump 15a Heat medium forward duct (second heat medium forward duct)
15b Heat medium return pipe (second heat medium return pipe)
16 Heat medium circulation pump 17 Heat medium circulation line 18 Bypass line 19 Switching valve (valve means)
20 Switching valve (valve means)
A Heat source machine loop B Air conditioner loop C Heat transfer loop

Claims (5)

A heat source machine loop, a plurality of air conditioner loops, and a heat transfer loop connecting the heat source machine loop and each air conditioner loop,
The heat source machine loop
A heat source device, a heat source pump, a first heat medium return pipe for supplying the heat medium from the heat transfer loop to the heat source device, and a first heat for supplying the heat medium from the heat source device to the heat transfer loop. And the heat source pump is provided in the first heat medium return pipe or the first heat medium forward pipe,
Air conditioner loop
An air conditioner, an air conditioner pump, a second heat medium forward pipe that supplies the heat medium from the heat transfer loop to the air conditioner, and a second heat medium that supplies the heat medium from the air conditioner to the heat transfer loop. A heat medium return pipe, and the air conditioner pump is provided in the second heat medium forward pipe or the second heat medium return pipe,
The heat transfer loop
A heat medium circulation pump, and a heat medium circulation pipe provided with the heat medium circulation pump to which the heat medium is supplied,
The plurality of air conditioner loops are sequentially disposed from the upstream side to the downstream side in the heat medium flow direction along the heat medium circulation pipe of the heat transfer loop,
The heat medium circulation pipe of the heat transfer loop is such that the second heat medium return pipe of each air conditioner loop is downstream of the second heat medium forward pipe of the air conditioner loop in the heat medium flow direction. Connected to
The second heat medium forward pipe of the air conditioner loop downstream of the predetermined air conditioner loop in the heat medium flow direction is a second air medium loop upstream of the air conditioner loop downstream of the heat medium flow direction. so as to be positioned to the heat medium flow direction downstream side of the heat medium Kaekanro, heat medium pipe system characterized in that it is connected to a heat medium circulation line of the heat transport loop.   A plurality of heat source machine loops are installed, and in a predetermined heat source machine loop, the first heat medium return pipe for supplying the heat medium from the heat transfer loop to the heat source machine, and the heat medium from the heat source machine to the heat transfer loop The heat medium piping system according to claim 1, wherein the first heat medium forward pipe to be fed is connected between the air conditioner loop connecting portions of the heat medium circulation pipe in the heat transfer loop. Each of the air conditioner loops other than the air conditioner loop located on the most downstream side in the heat medium flow direction has a bypass pipe line,
The bypass line is
One end is connected to the second heat medium return pipe in the air conditioner loop other than the air conditioner loop located on the most downstream side in the heat medium flow direction,
The other end is connected to the heat medium circulation line of the heat transfer loop on the downstream side of the second heat medium return line connection part of the air conditioner loop located on the most downstream side in the heat medium flow direction,
The second heat medium return pipe in the air conditioner loop is provided with a first valve means so as to be located on the downstream side in the heat medium flow direction from the bypass pipe connection position of the second heat medium return pipe. ,
The heat medium piping system according to claim 1 or 2, wherein the bypass pipe is provided with second valve means. If the thermal load is lower than a predetermined value, open the first valve means and close the second valve means,
The heat medium piping system according to claim 3, wherein when the thermal load is equal to or greater than a predetermined value, the first valve means is closed and the second valve means is opened.   The heat medium piping system according to any one of claims 1 to 4, wherein the heat source pump, the air conditioner pump, and the heat medium circulation pump are configured to be capable of controlling the rotation speed.

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