JP2019105385A - Heat source system - Google Patents

Abstract

To provide a heat source system that can be expected of an even greater energy saving effect relative to a case of utilizing a heat source device of a water cooling type as a hot heat source.SOLUTION: A heat source system 10 comprises water service pipe 11 buried in a road or the like paved with asphalt 3 to carry out heat exchange between hot water (HR) delivered from an air conditioner 1 and the ground surface. A PLC 19 controls a valve BV3 to open and controls valves BV1, BV2 and BV4 to close if the temperature of the asphalt 3 is at a prescribed one or higher. A TIC 17 controls a three-way valve 15 to open or close so as to mix hot water heated by the water service pipe 11 with hot water having bypassed the water service pipe 11 to control the temperature thereof to reach a prescribed one. The hot water of the prescribed temperature is directly supplied to the air conditioner 1 without flowing through a heat exchanger 21.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a heat source system, and more particularly to a heat source in a heat source system.

  In the four-pipe central air conditioning, dehumidification and reheating control is performed to dehumidify. In the dehumidification reheating control, not only cold water but also hot water is supplied to the air conditioner even in summer to perform supercooling to make the air cooler than the required temperature and then perform heating. If energy such as gas or electricity is consumed to generate the hot water to be supplied, energy saving becomes difficult to realize.

  Therefore, since the temperature of the used cooling water delivered from the absorption refrigerator is maintained at a high temperature by variable flow rate control, conventionally, the high temperature used cooling water is air that follows the cooling dehumidification in the air conditioner. A technique for effectively utilizing the heat source for reheating of has been proposed (for example, Patent Document 1).

JP, 2006-170508, A JP 2007-212085 A

  However, in Patent Document 1, although a water-cooled heat source device (absorption type refrigerator) is used as a heat source, it is not so much to heat the used cooling water to a desired temperature only by the exhaust heat in the heat source device. I can not expect it. That is, energy is consumed to heat the used cooling water to a desired temperature.

  An object of the present invention is to provide a heat source system in which a further energy saving effect can be expected as compared with the case of using a water-cooled heat source device as a heat source.

  A heat source system according to the present invention is a heat source system for supplying a medium having a predetermined temperature to equipment, which is buried near the ground surface and performs heat exchange between the medium sent to the heat source system and the ground surface A heat exchange means, and a supply mechanism which adjusts the medium heat-exchanged by the heat exchange means to a predetermined temperature and supplies the medium to the equipment, and heats the heat of the ground surface warmed by solar radiation as a heat source It is characterized by using as.

  Further, the heat exchange means is a pipe which is buried under the ground surface being paved.

  Further, the supply mechanism is characterized by comprising a temperature control mechanism for adjusting the temperature of the medium heat-exchanged by the heat exchange means to a predetermined temperature.

  Further, the temperature control mechanism is a three-way valve for mixing the medium sent to the heat source system, the medium heat-exchanged by the heat exchange means, and the medium not heat-exchanged by the heat exchange means; The medium heat-exchanged by the heat exchange means by controlling the opening degree of the three-way valve based on the measuring means for measuring the temperature of the medium output from the three-way valve and the temperature of the medium measured by the measuring means And three-way valve control means for adjusting so that the temperature of the air conditioner becomes a predetermined temperature.

  Further, the supply mechanism is characterized by having a flow path control means for controlling the flow path of the medium to be supplied to the equipment according to the relationship between the temperature of the medium sent to the heat source system and the temperature of the ground surface. .

  Further, the flow path control means is characterized in that the medium is directly supplied to the equipment when the temperature of the medium is adjusted to a predetermined temperature by the temperature control mechanism.

  The flow path control means supplies the medium to the heating means to heat the medium to a predetermined temperature when the temperature control mechanism can not adjust the temperature of the medium heat-exchanged by the heat exchange means to reach a predetermined temperature. It is characterized in that it is supplied to the equipment after being allowed to

  In addition, when the temperature of the ground surface is lower than the temperature of the medium sent to the heat source system, the flow path control means supplies the medium to the heating means without supplying the medium to the heat exchange means, and the predetermined temperature is obtained. And then supply to the equipment.

  Moreover, the said installation is an air conditioner which performs dehumidification reheating control, It is characterized by the above-mentioned.

  Further, the medium sent to the heat source system is a medium in which the medium having a predetermined temperature supplied by the supply mechanism is used by the air conditioner and the temperature is lower than the predetermined temperature. Do.

  According to the present invention, a further energy saving effect can be expected by effectively using the heat of the ground surface warmed by the sun's solar radiation as a heat source.

It is an instrumentation figure showing an embodiment of a heat source system concerning the present invention. It is a figure which shows the opening-and-closing pattern of the opening-and-closing control of the valve which PLC (Programmable Logic Controller) performs in this Embodiment in a table form. It is a figure which shows three-way valve control which TIC (Temperature Indication Controller) in this Embodiment performs.

  Hereinafter, preferred embodiments of the present invention will be described based on the drawings.

  FIG. 1 is an instrumentation diagram showing an embodiment of a heat source system according to the present invention. In the present embodiment, a 4-pipe air conditioner (AHU: Air Handling Unit) 1 is assumed as a facility for supplying hot water. Therefore, although it also has a structure which supplies cold water also to the air conditioner 1, in this Embodiment, since it does not use for description, it is abbreviate | omitted from FIG. 1 for convenience. The configuration for supplying cold water to the air conditioner 1 may be the same as before.

  The heat source system 10 in the present embodiment supplies hot water (HS) of a predetermined temperature to the air conditioner 1. The heating coil (HC) 2 in the air conditioner 1 reheats the air supercooled by the hot water (HS). Hot water (HR) used for reheating is returned to the heat source system 10 in a state where the temperature is lower than a predetermined temperature.

  The heat source system 10 in the present embodiment is roughly divided into the heat exchange means 11 and the supply mechanism 12. The heat exchange means 11 is buried near the ground surface and performs heat exchange between the hot water (HR) sent from the air conditioner 1 to the heat source system 10 and the ground surface. In the present embodiment, the heat exchange means is realized by a water distribution pipe. Roads and parking lots are usually paved with asphalt or the like. In this embodiment, although it is explained on the premise that roads and the like are paved with asphalt 3, heat exchange means (hereinafter referred to as "water distribution pipe") 11 is under asphalt 3, that is, asphalt and ground surface. Be buried between Although the reason will become clear from the following description, in order to improve the energy saving effect, it is effective to install the water distribution pipe 11 so as to be relatively thin, long, and in contact with the asphalt 3. Also, a temperature detector (TE: Temperature sensing Element) 13 is a measuring means for measuring the temperature of the asphalt 3.

  The supply mechanism 12 adjusts the hot water warmed by the heat exchange in the water distribution pipe 11 to a predetermined temperature and supplies it to the air conditioner 1. In the present embodiment, approximately 40 degrees is assumed as the predetermined temperature, that is, the temperature of the hot water (HS) supplied to the air conditioner 1. Of course, it is not necessary to limit to this temperature, and a predetermined temperature may have a range (range).

  In FIG. 1, a solid line indicates a water distribution pipe, and a broken line indicates a signal line (control signal line, data signal line). BV1 to BV4 are valves.

  A temperature detector 14 for measuring the temperature of the hot water (HR) is attached to the water pipe through which the hot water (HR) sent from the air conditioner 1 flows, and it is branched into the pump 20 side and the valve BV1 side. A water distribution pipe extending forward from the pump 20 is branched to the three-way valve 15 side without passing through the water distribution pipe 11 side and the water distribution pipe 11. The outlet of the water distribution pipe 11 is connected to one of the inlets of the three-way valve 15.

  A water distribution pipe extending forward from the outlet of the three-way valve 15 is branched into the valve BV2 side and the valve BV3 side. A pipe temperature detector (TEW: Temperature sensing Element for Water) 16 that measures the temperature of the hot water at the outlet of the three-way valve 15 is attached to the water distribution pipe near the outlet of the three-way valve 15. A water distribution pipe extending from the valve BV3 sends hot water (HS) to the air conditioner 1. On the other hand, the piping extending from the valve BV2 is connected to the heat exchanger 21 via the pump 23. A water distribution pipe extending from the valve BV1 is joined to a water distribution pipe between the valve BV2 and the pump 23. A water distribution pipe extending forward from the heat exchanger 21 is joined to the water distribution pipe from the valve BV3 side via the valve BV4, and sends hot water (HS) to the air conditioner 1 as described above. The water pipe and the valves BV1 to BV4, the three-way valve 15, the temperature detector 14, the pipe temperature detector 16, the pumps 20 and 23, and the heat exchanger 21 are in the above-described connection relationship.

  The TIC 17 controls the opening degree of the three-way valve 15 based on the temperature of the hot water measured by the piping temperature detector 16 to adjust the temperature of the hot water heat-exchanged by the water pipe 11 to a predetermined temperature. It functions as a valve control means. The TIC 17 is a controller equipped with storage means such as a CPU, a ROM, a RAM, a hard disk drive (HDD), etc., and operates and controls according to the installed program. The three-way valve control means may be realized by PLC. The electric motor 18 opens and closes the three-way valve 15 under the control of the TIC 17. The heat source system 10 includes a temperature control mechanism that adjusts the temperature of the hot water heat-exchanged by the water distribution pipe 11 to a predetermined temperature, but in the present embodiment, the TIC 17, the three-way valve 15, and the piping temperature detector A temperature control mechanism is realized by 16 and the electric motor 18.

  The PLC 19 is a controller that performs opening / closing control of the valves BV1 to BV4 and operation control of the pump 20, and opens / closes the valves BV1 to BV4 based on the temperature measured by the temperature detectors 13 and 14 as described later. Functions as a flow path control unit that controls the flow path of the hot water supplied to the air conditioner 1. The PLC 19 includes storage means such as a CPU, a ROM, a RAM, a hard disk drive (HDD), etc., and operates and controls in accordance with the installed program.

  The heat exchanger 21 is a heating means for heating the sent hot water to a predetermined temperature. The heat source device 22 is used as a heat source of the heat exchanger 21. The heat exchanger 21 and the heat source apparatus 22 may use existing equipment.

  FIG. 2 is a table showing an opening / closing pattern of opening / closing control of the valves BV1 to BV4 performed by the PLC 19 in the present embodiment. The PLC 18 in the present embodiment performs opening / closing control of the valves BV1 to BV4 in accordance with three control modes of free heating, preheating, and no heating. In the present embodiment, as described above, the heat exchanger 21 is prepared as heating means for hot water, but “free heating” is a water distribution pipe as means for heating hot water without using the heat exchanger 21. This is a mode using only 11. That is, the hot water (HR) sent from the air conditioner 1 is supplied to the water distribution pipe 11, and the hot water warmed by the water distribution pipe 11 is adjusted to a predetermined temperature by the temperature control mechanism and then supplied directly to the air conditioner 1. It is a mode. As described above, in the free heating, the hot water is controlled to flow through the water distribution pipe 11 and not through the heat exchanger 21.

  "Preheating" supplies hot water (HR) sent from the air conditioner 1 to the water distribution pipe 11 similarly to free heating, but the temperature of the hot water heat-exchanged by the water distribution pipe 11 is a predetermined temperature If the temperature control mechanism can not be adjusted so as to reach the above, the mode is a mode in which hot water previously heated through the water distribution pipe 11 is supplied to the heat exchanger 21 to be further heated to a predetermined temperature and then supplied to the air conditioner 1 . In preheating, the hot water is flow-controlled so as to pass through both the water distribution pipe 11 and the heat exchanger 21 which are means for heating.

  "No heating" is a mode in which the hot water sent from the air conditioner 1 is directly supplied to the heat exchanger 21 without using the water distribution pipe 11 at all as the heating means for the hot water. That is, in this mode, the hot water (HR) sent from the air conditioner 1 is supplied to the heat exchanger 21, heated to a predetermined temperature, and then supplied to the air conditioner 1. Without heating, the hot water is allowed to pass through the heat exchanger 21 and flow controlled so as not to pass through the water distribution pipe 11.

  What is characteristic in the present embodiment is that the heat of the ground surface warmed by solar radiation is used as a heat source. In the case of asphalt 3, the temperature may rise to nearly 60 ° C. due to the solar radiation of the sun. In the present embodiment, the warm hot water (HR) is heated to a high temperature by heat exchange using the heat of the asphalt 3 heated by the sun's solar radiation. Although the initial cost of burying the water distribution pipe 11 may be high, the subsequent running cost may be as large as opening and closing the three-way valve 15 and the valves BV1 to BV4 and driving the pump 20.

  Hereinafter, the operation of the heat source system 10 in the present embodiment will be described. The heat source system 10 changes the temperature of the hot water (HR) having a temperature lower than the predetermined temperature (40 ° C.) sent from the air conditioner 1 into the hot water (HS) of the predetermined temperature and then supplies the hot water (HS) to the air conditioner 1. Therefore, the PLC 19 controls the flow path of the hot water supplied to the air conditioner 1 according to the relationship between the temperature of the hot water (HR) measured by the temperature detector 14 and the temperature of the asphalt 3 measured by the temperature detector 13 Do.

  First, if the temperature of the asphalt 3 is equal to or higher than a predetermined temperature, it is possible to raise the temperature to a predetermined temperature by sending hot water (HR) to the water distribution pipe 11. Therefore, it can be said that the temperature of the asphalt 3 is higher than the temperature of the hot water (HR) when the temperature of the asphalt 3 is equal to or higher than the predetermined temperature. In this case, the PLC 19 operates the heat source system 10 in the free heating mode. That is, according to the table shown in FIG. 2, the valve BV3 is controlled to open, and the valves BV1, BV2 and BV4 are closed. Thereby, the hot water (HR) is sent to the water distribution pipe 11 through the pump 20 as shown by the arrow A. Further, as shown by arrow B, it is also sent to the three-way valve 15.

  The hot water sent to the water distribution pipe 11 is heated by heat exchange between the asphalt 3 heated by solar radiation of the sun and the water distribution pipe 11, and is sent to the three-way valve 15.

  The hot water heated by passing through the water distribution pipe 11 and the unheated hot water from the air conditioner 1 bypassing the water distribution pipe 11 are sent to the three-way valve 15. The TIC 17 adjusts the temperature of the hot water discharged from the outlet of the three-way valve 15 by adjusting the opening degree of the inlet side of the three-way valve 15 based on the temperature measured by the piping temperature detector 16.

  FIG. 3 is a diagram showing three-way valve control performed by the TIC 17 in the present embodiment, and is a diagram showing an opening degree of an inlet on the water distribution pipe 11 side (hereinafter simply referred to as “water distribution pipe side”). In FIG. 3, "SP" is a set value corresponding to the predetermined temperature. When the temperature of the hot water on the water distribution pipe side is a predetermined temperature (40 ° C.), it is sufficient to output only the hot water from the water distribution pipe side. Therefore, the opening degree of the water distribution pipe side is 100%, and the opening degree of the inlet on the side which bypassed the water distribution pipe 11 (hereinafter, simply referred to as "bypass side") is 0%. Then, as the temperature of the hot water on the distribution pipe side becomes higher than the predetermined temperature (40 ° C.), the opening degree on the distribution pipe side is narrowed from 100%, while the opening degree on the bypass side is raised from 0%. Go. Thus, the TIC 17 mixes the warm water on the distribution pipe side not lower than a predetermined temperature with the warm water on the bypass side less than 40 ° C. that is not heated, so that the hot water exiting from the outlet of the three-way valve 15 has a predetermined temperature Adjust to become

  The hot water whose temperature has been adjusted to a predetermined temperature as described above flows in the direction of arrow C since the valve BV2 is closed and the valve BV3 is open, and is supplied to the air conditioner 1 through the valve BV3.

  As described above, according to the present embodiment, the heat of asphalt 3 heated by the sun's rays of the sun is used to heat warmth warm water (HR) to a predetermined temperature by heat exchange, and the predetermined temperature is obtained. The hot water (HS) that has become can be supplied to the air conditioner 1. Under the present circumstances, it is not necessary to operate the heat exchanger 21 which makes the heat-source apparatus 22 a heat source at all. For this reason, since the fuel cost for operating the heat-and-heat source device 22 becomes unnecessary, the energy saving effect can be improved, which leads to the reduction of the running cost.

  By the way, due to the relationship of solar radiation, it may not be possible to heat the hot water (HR) to a predetermined temperature or more only by heat exchange with the water distribution pipe 11. The case where the temperature of asphalt 3 is less than 40 ° C. corresponds to this. That is, when the measurement temperature of the asphalt 3 is less than 40 ° C. but higher than the temperature of the hot water (HR), the PLC 19 operates the heat source system 10 in the preheating mode. That is, according to the table shown in FIG. 2, the valves BV2 and BV4 are controlled to open, and the valves BV1 and BV3 are closed. Thereby, the hot water (HR) is sent to the water distribution pipe 11 through the pump 20 as shown by the arrow A. Further, as shown by arrow B, it is also sent to the three-way valve 15.

  Then, as in the free heating mode, the TIC 17 adjusts the temperature of the hot water discharged from the outlet of the three-way valve 15 based on the temperature measured by the pipe temperature detector 16. However, here, the measured temperature of the hot water does not reach the predetermined temperature. In this case, the TIC 17 causes hot water to be output from the three-way valve 15 with the degree of opening on the side of the water distribution pipe 11 being 100%.

  This hot water flows in the direction of arrow D and is sent to the heat exchanger 21 through the valve BV2 and the pump 23 that are controlled to be opened. Since the valve BV3 is controlled to be closed, it is not sent to the air conditioner 1. The heat exchanger 21 heats the sent hot water to a predetermined temperature and outputs it. The hot water discharged from the heat exchanger 21 is supplied to the air conditioner 1 because the valve BV4 is controlled to open and the valve BV3 is controlled to close.

  According to the present embodiment, when the temperature of the hot water can not be raised to the predetermined temperature only by the heat exchange with the water distribution pipe 11, the temperature is raised to the predetermined temperature using the heat exchanger 21. However, rather than leaving all of the heating of the hot water to the heat exchanger 21, the hot water is sent to the water distribution pipe 11 to slightly heat it, thereby avoiding any reduction in the energy saving effect. That is, the hot water (HR) is heated through the water distribution pipe 11, and the flow control is performed so that the temperature rise is compensated by the heat exchanger 21.

  By the way, when the sun's solar radiation is insufficient, or in winter, it may be assumed that the temperature of the asphalt 3 is lower than the temperature of the hot water (HR). In this case, when heat exchange is performed in the water distribution pipe 11, the temperature of the hot water (HR) may be further decreased. Therefore, when the temperature of asphalt 3 is lower than hot water (HR), the PLC 19 operates the heat source system 10 in the no heating mode. That is, according to the table shown in FIG. 2, the valves BV1 and BV4 are controlled to open, and the valves BV2 and BV3 are controlled to close. Thereby, warm water (HR) flows as shown by arrow E, and is sent to the heat exchanger 21 via the pump 23. The heat exchanger 21 heats the sent hot water to a predetermined temperature and outputs it. The hot water emitted from the heat exchanger 21 is directly supplied to the air conditioner 1 as in the preheating mode.

  According to the present embodiment, when the temperature of the asphalt 3 is lower than the hot water (HR), the temperature of the hot water is raised using the heat exchanger 21 without utilizing the heat exchange by the water distribution pipe 11 at all. If the hot water sent to the side of the water distribution pipe 11 is used as in the other control modes, the temperature of the hot water may be rather decreased. Therefore, in the present embodiment, closing the valves BV2 and BV3 adversely affects To avoid heat exchange that could

  As described above, in the present embodiment, the case where the water distribution pipe 11 is embedded in a road or the like paved with the asphalt 3 has been described as an example. As apparent from the above description, in order to raise the temperature of the hot water (HR), it is effective to install the water distribution pipe 11 so as to be relatively thin, long, and in contact with the asphalt 3. The asphalt 3 is efficient for heat utilization because it is likely to be high temperature due to solar radiation, but it is not necessary to be limited to the asphalt 3 as long as the ground surface can be heated. For example, the ground surface may be paved with stone, brick, concrete, gravel, etc. As in the present embodiment, a solar power generation system exists as a system that uses sunlight (sunlight of the sun). Even if the panels of the photovoltaic system are installed not on the roof but on roads, etc., they need to be installed on the ground surface. On the other hand, since the present embodiment is buried under the ground surface, the installation space of the water distribution pipe 11 is not likely to be restricted compared to the panel of the solar power generation. Moreover, since there is room for selection about the thickness, length, material, etc. of a pipe, the water distribution pipe 11 is easy to correspond flexibly to the installation place and method.

  Further, although the four-pipe air conditioner 1 has been described as an example of the facility for providing hot water in the present embodiment, the present invention is also applicable to different facilities that use hot water. For example, hot water may be supplied to bathroom facilities such as showers and facilities such as hospitals.

  The present embodiment is characterized in that the heat of the ground surface warmed by the solar radiation of the sun is used as a heat source. The case where it applied to the air-conditioning system which circulates warm water between the air conditioner 1 and the heat-source system 10 was made into an example and demonstrated as the one embodiment. That is, although the air conditioner 1 is the supply destination of the hot water (HS) and the supply source of the hot water (HR), the supply destination and the supply source of the hot water do not necessarily have to coincide with each other.

  Further, although the case of using water as the medium has been described as an example in the present embodiment, the present invention is also applicable to other media such as fluid other than water and gas other than fluid.

Reference Signs List 1 air conditioner, 2 heating coil (HC), 3 asphalt, 10 heat source system, 11 heat exchange means (water distribution pipe), 12 supply mechanism, 13, 14 temperature detector, 15 three-way valve, 16 piping temperature detector, 17 TIC , 18 electric motor, 19 PLC, 20, 23 pumps, 21 heat exchangers, 22 heat source devices, BV1, BV2, BV3, BV4 valves.

Claims (10)

In a heat source system for supplying a medium of a predetermined temperature to an installation,
Heat exchange means embedded near the ground surface and performing heat exchange between the medium sent to the heat source system and the ground surface;
A supply mechanism which adjusts the medium heat-exchanged by the heat exchange means to a predetermined temperature and supplies the medium to the equipment;
A heat source system, comprising: heat of the ground surface warmed by solar radiation as the heat source.   The heat source system according to claim 1, wherein the heat exchange means is a pipe embedded below the ground surface being paved.   The heat source system according to claim 1, wherein the supply mechanism includes a temperature control mechanism which adjusts the temperature of the medium heat-exchanged by the heat exchange means to a predetermined temperature. The temperature control mechanism is
A three-way valve for mixing, among the media sent to the heat source system, the medium heat-exchanged by the heat exchange means and the medium not heat-exchanged by the heat exchange means;
Measuring means for measuring the temperature of the medium output from the three-way valve;
Three-way valve control means for adjusting the temperature of the medium heat-exchanged by the heat exchange means to be a predetermined temperature by controlling the opening degree of the three-way valve based on the temperature of the medium measured by the measuring means ,
The heat source system according to claim 3, comprising:   The said supply mechanism is characterized by having a flow-path control means which controls the flow path of the medium supplied to the said installation by the relationship between the temperature of the medium sent to the said heat source system, and the temperature of the ground surface. The heat source system according to 3.   The heat source system according to claim 5, wherein the flow path control means directly supplies the medium to the facility when the temperature of the medium is adjusted to a predetermined temperature by the temperature control mechanism.   When the temperature control mechanism can not adjust the temperature of the medium heat-exchanged by the heat exchange means to reach a predetermined temperature, the flow path control means supplies the medium to the heating means to heat the medium to the predetermined temperature. The heat source system according to claim 5, wherein the heat source system is supplied from the   When the temperature of the ground surface is lower than the temperature of the medium sent to the heat source system, the flow path control means supplies the medium to the heating means without supplying the medium to the heat exchange means to heat the medium to a predetermined temperature. The heat source system according to claim 5, wherein the heat source system is supplied to the equipment after being allowed to cool.   The heat source system according to claim 1, wherein the equipment is an air conditioner that performs dehumidification and reheating control. The medium sent to the heat source system is a medium in which the medium having a predetermined temperature supplied by the supply mechanism is used by the air conditioner and the temperature is lower than the predetermined temperature. The heat source system according to Item 9.

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