CN216010982U - Indoor skating rink building waste heat recovery and heating system - Google Patents
Indoor skating rink building waste heat recovery and heating system Download PDFInfo
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- CN216010982U CN216010982U CN202122218792.8U CN202122218792U CN216010982U CN 216010982 U CN216010982 U CN 216010982U CN 202122218792 U CN202122218792 U CN 202122218792U CN 216010982 U CN216010982 U CN 216010982U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/12—Hot water central heating systems using heat pumps
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/56—Heat recovery units
Abstract
The utility model discloses an indoor skating rink building waste heat recovery and heating system belongs to waste heat recovery and building energy management field, solves prior art and does not disclose the correlation technique that carries out the recovery to skating rink building waste heat, can cause the energy availability factor in the skating rink building to be low, can't realize energy saving and consumption reduction, carbon emission reduction's purpose, and the waste heat that is not utilized is arranged to outdoor, can cause the environment by thermal pollution scheduling problem. The utility model comprises a waste water storage device for storing waste water discharged into a sewer pipeline and an under-ice circulation pipeline for recovering waste heat in the ice making process; the filtering device I, the heat exchanger I, the heat pump and the low-temperature heat storage water tank are sequentially connected with the wastewater storage device; the brine pump, the ice maker, the filtering device II and the high-temperature heat storage water tank are sequentially connected with the under-ice circulation pipeline; the low-temperature heat storage water tank and the high-temperature heat storage water tank realize low-temperature heat supply or/and high-temperature heat supply through the control mechanism. The utility model is used for waste heat recovery heat supply.
Description
Technical Field
An indoor skating rink building waste heat recovery and heat supply system is used for waste heat recovery and heat supply and belongs to the field of waste heat recovery and building energy management.
Background
The skating rink belongs to a special building type and has huge energy consumption, and the largest energy consumption in the indoor skating rink comes from the ice making process and the domestic hot water supply. After the ice making process and the domestic hot water are used, a large amount of waste heat/waste hot water exists, if the waste heat/waste hot water is not reused, the waste is wasted, and the environment is also polluted by heat when the waste heat/waste hot water is discharged into the outdoor environment. Patent CN202110560082.5 proposes a carbon dioxide ice-making pipeline system for speed skating sites, which discloses a new carbon dioxide-based ice-making pipeline system, but does not mention a large amount of waste heat treatment generated in the ice-making process, and the waste heat discharged to the outdoor causes thermal pollution of the environment. Patent CN201521032164.9 also proposes a carbon dioxide refrigerating unit suitable for ice skating rink, and also does not consider the problem of waste heat recovery. Patent CN201921966638.5 proposes an energy-saving heat exchange device for skating rink, which is aimed at increasing the circulation time of heat exchange medium in the heat exchange tube during confluence, improving the heat exchange amount and shortening the ice making time. The research of the above patents focuses on improving the ice making efficiency or shortening the ice making time of the ice making process in the skating rink, while neglecting to utilize the waste heat in the ice making process and the domestic hot water system to improve the energy efficiency.
The prior art does not disclose the related technology for recovering the waste heat of the ice skating rink building, and the following technical problems can exist:
1. the energy utilization efficiency in the skating rink building is low, and the aims of energy conservation, consumption reduction and carbon emission reduction cannot be realized;
2. the waste heat which is not utilized is discharged to the outside, which causes the problems of the environment being polluted by heat and the like.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide an indoor skating rink building waste heat recovery and heating system solves the prior art and does not disclose the correlation technique that carries out the recovery to skating rink building waste heat, can cause the energy availability factor in the skating rink building to be low, can't realize energy saving and consumption reduction, carbon emission reduction's purpose, and not discharged to outdoor by the waste heat of utilizing, can cause the environment by thermal pollution scheduling problem.
In order to realize the purpose, the utility model discloses a technical scheme be:
an indoor skating rink building waste heat recovery and heat supply system comprises a waste water storage device for storing waste water discharged into a sewer pipeline and an under-ice circulation pipeline for recovering waste heat in an ice making process;
the filtering device I, the heat exchanger I, the heat pump and the low-temperature heat storage water tank are sequentially connected with the wastewater storage device;
the brine pump, the ice maker, the filtering device II and the high-temperature heat storage water tank are sequentially connected with the under-ice circulation pipeline;
the low-temperature heat storage water tank and the high-temperature heat storage water tank realize low-temperature heat supply or/and high-temperature heat supply through the control mechanism.
Further, the control mechanism comprises a four-way regulating valve, a three-way mixing valve and an electromagnetic switch valve;
a first port of the four-way regulating valve is connected with an outlet of the low-temperature heat storage water tank, a second port of the four-way regulating valve is connected with low-temperature heat utilization equipment in a skating rink, a third port of the four-way regulating valve is connected with an inlet of the high-temperature heat storage water tank, and a fourth port of the four-way regulating valve is connected with a first port of the three-way mixing valve;
a first port of the three-way regulating valve is connected with an outlet of the high-temperature heat storage water tank, a second port of the three-way regulating valve is connected with high-temperature heat utilization equipment in the skating rink, and a third port of the three-way regulating valve is connected with a second port of the three-way mixing valve;
and a third port of the three-way mixing valve is connected with an inlet of the electromagnetic switch valve, and an outlet of the electromagnetic switch valve is connected with heat utilization equipment outside the skating field.
Furthermore, a third port of the four-way regulating valve is connected with an inlet of the high-temperature heat storage water tank through an electric auxiliary heating device.
Further, a second port of the four-way regulating valve is connected with low-temperature heat utilization equipment through a first water distribution mechanism;
the low-temperature heat utilization equipment comprises a ground anti-freezing protection device, an ice-coated hot water supply device and a heat supply air device;
the first water diversion mechanism comprises a water diverter I, a heat exchanger II and a heat exchanger III;
the first port of the water separator I is connected with the second port of the four-way regulating valve, the second port is connected with the inlet of the heat exchanger II, the outlet of the heat exchanger II is connected with the ground anti-freezing protection device, the third port is connected with the ice-coated hot water supply device, the fourth port is connected with the inlet of the heat exchanger III, and the outlet of the heat exchanger III is connected with the heat supply air device.
Further, a second port of the three-way regulating valve is connected with high-temperature heat utilization equipment through a second water distribution mechanism;
the high-temperature heat utilization equipment comprises a floor heating device and a domestic hot water supply device;
the second water diversion mechanism comprises a water diverter II, a heat exchanger IV and a water purifier;
the first port of the water separator II is connected with the second port of the three-way regulating valve, the second port is connected with the inlet of the heat exchanger IV, the outlet of the heat exchanger IV is connected with a floor heating device, the third port is connected with the inlet of the water purifier, and the outlet of the water purifier is connected with a domestic hot water supply device.
Furthermore, the water separator I and the water separator II disperse one path of inlet water into multiple paths of output, and the standard water separator is a standard water separator capable of adjusting the flow of each loop. Compared with the prior art, the utility model has the advantages of:
the utility model discloses with the waste heat recovery of the waste water of ice making process and discharge in the underground water pipe recycle, the energy availability factor in the skating rink building can be improved to this system, realizes energy saving and consumption reduction, accelerates to realize carbon emission reduction, and carbon reaches peak and carbon neutralization target, simultaneously, can avoid not being discharged into outdoor environment by the waste heat of utilization and cause thermal pollution, and unnecessary heat can be used to other heat-using buildings, can be used to other heat-using equipment;
secondly, the control mechanism of the utility model realizes low-temperature heat supply of the low-temperature heat storage water tank and high-temperature heat supply of the high-temperature heat storage water tank, and can discharge redundant low-temperature hot water into the high-temperature heat storage water tank to be mixed with the high-temperature hot water to realize high-temperature heat supply;
thirdly, the electric auxiliary heating device arranged in the utility model is convenient to heat the redundant low-temperature hot water to the temperature range of the high-temperature hot water and then discharge the hot water into the high-temperature heat storage water tank, so as to prevent the low-temperature hot water from being too low in temperature and directly discharging the hot water into the high-temperature heat storage water tank, so that the temperature of the high-temperature hot water is too low;
fourth, the utility model provides a first water diversion mechanism and second water diversion mechanism can shunt low temperature heat supply and high temperature heat supply respectively to be used for the environmental requirement of difference.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to these drawings without inventive efforts.
Fig. 1 is a schematic diagram of the framework of the present invention;
in the figure, 1-a wastewater storage device, 2-a filtering device I, 3-a heat exchanger I, 4-a heat pump, 5-a low-temperature heat storage water tank, 6-a four-way regulating valve, 7-a water separator I, 8-a heat exchanger II, 9-a ground anti-freezing protection device, 10-an ice-coated hot water supply device, 11-a heat exchanger III, 12-a heat supply air device, 13-an electric auxiliary heating device, 14-an ice surface circulation pipeline, 15-a brine pump, 16-an ice machine, 17-a filtering device II, 18-a high-temperature heat storage water tank, 19-a three-way regulating valve, 20-a water separator II, 21-a heat exchanger IV, 22-a floor heating device, 23-a water purifier, 24-a domestic hot water supply device, 25-a three-way mixing valve, a heat pump, a, 26-electromagnetic switch valve, 27-heat using equipment.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the present invention, it should be noted that, if the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the position or positional relationship based on the position or positional relationship shown in the drawings, or the position or positional relationship which is usually placed when the product of the present invention is used, the description is only for convenience of description and simplification, but the indication or suggestion that the device or element to be referred must have a specific position, be constructed and operated in a specific position, and thus, cannot be understood as a limitation of the present invention.
Furthermore, the appearances of the terms "first," "second," "third," and the like, if any, are only used to distinguish one description from another, and are not to be construed as indicating or implying relative importance.
Furthermore, the terms "horizontal", "vertical", "overhang" and the like do not require that the components be absolutely horizontal or overhang, but may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.
In the description of the present invention, it should be further noted that unless otherwise explicitly stated or limited, the terms "disposed," "mounted," "connected," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
It should be noted that the features of the embodiments of the present invention may be combined with each other without conflict.
The method aims to solve the problems that the prior art does not disclose a related technology for recovering the waste heat of the skating rink building, the energy utilization efficiency in the skating rink building is low, the purposes of energy conservation, consumption reduction and carbon emission reduction cannot be realized, the unused waste heat is discharged to the outdoor, the environment is thermally polluted and the like. As shown in fig. 1, the indoor skating rink building waste heat recovery and heat supply system is provided, which comprises a waste water storage device 1 for storing waste water discharged into a sewer pipe and an under-ice circulation pipeline 14 for recovering waste heat in an ice making process; the filtering device I2, the heat exchanger I3, the heat pump 4 and the low-temperature heat storage water tank 5 are sequentially connected with the wastewater storage device 1; the brine pump 15, the ice maker 16, the filtering device II17 and the high-temperature heat storage water tank 18 are sequentially connected with the under-ice circulation pipeline 14; the low-temperature heat storage water tank 5 and the high-temperature heat storage water tank 18 realize low-temperature heat supply or/and high-temperature heat supply through a control mechanism.
In practice, people in a skating rink drain waste hot water after hot water using activities such as bathing, sauna and the like into a sewer pipe, collect the waste hot water into the waste water storage device 1, filter the waste water flowing out of the waste water storage device 1 through a filter device I2, then enter a heat exchanger I3 to exchange heat with air, the heated air enters a heat pump 4 to generate low-temperature hot water at about 33 ℃, and the low-temperature hot water is stored in a low-temperature heat storage water tank 5; the brine solution in the under-ice circulation pipeline 14 is used as a secondary coolant to absorb heat from the ice surface in the circulation process, and enters the ice maker 16 under the action of the brine pump 15, heat is exchanged in the ice maker 16 to generate high-temperature hot water at about 55 ℃, the high-temperature hot water is filtered by the filtering device II17 and then stored in the high-temperature heat storage water tank 18, and the low-temperature heat storage water tank 5 and the high-temperature heat storage water tank 18 realize low-temperature heat supply and high-temperature heat supply through the control mechanism.
Example 2
On the basis of the embodiment 1, the control mechanism comprises a four-way regulating valve 6, a three-way regulating valve 19, a three-way mixing valve 25 and an electromagnetic switch valve 26; a first port of the four-way regulating valve 6 is connected with an outlet of the low-temperature heat storage water tank 5, a second port of the four-way regulating valve is connected with low-temperature heat utilization equipment in a skating rink, a third port of the four-way regulating valve is connected with an inlet of the high-temperature heat storage water tank 18, and a fourth port of the four-way regulating valve is connected with a first port of the three-way mixing valve 25; a first port of the three-way regulating valve 19 is connected with an outlet of the high-temperature heat storage water tank 18, a second port of the three-way regulating valve is connected with high-temperature heat utilization equipment in a skating rink, and a third port of the three-way regulating valve is connected with a second port of the three-way mixing valve 25; the third port of the three-way mixing valve 25 is connected with the inlet of the electromagnetic switch valve 26, and the outlet of the electromagnetic switch valve 26 is connected with a heat utilization device outside the skating field. It is not excluded that the control mechanism may also be of other construction.
In practice, low-temperature hot water at about 33 ℃ (such as 30 ℃ to 40 ℃) discharged from a low-temperature heat storage water tank 5 is controlled by a four-way regulating valve 6 to supply low-temperature heat to low-temperature heat utilization equipment, after the heat supply requirement of the low-temperature heat utilization equipment is met, redundant low-temperature hot water at about 33 ℃ in the low-temperature heat storage water tank 5 enters a high-temperature heat storage water tank 18 through the four-way regulating valve 6 to be mixed and then is stored in the high-temperature heat storage water tank 18, high-temperature hot water at about 55 ℃ (such as 50 ℃ to 60 ℃) in the high-temperature heat storage water tank 18 is controlled by a three-way regulating valve 19 to supply high-temperature heat to the high-temperature heat utilization equipment, after the low-temperature heat utilization equipment and the high-temperature heat utilization equipment supply heat, residual heat water in the low-temperature heat storage water tank 5 and the high-temperature heat storage water tank 18 can respectively enter a three-way mixing valve 25 to be mixed through the four-way regulating valve 6 and the three-way regulating valve 19, and the mixed hot water can be controlled by an electromagnetic switch valve 26, to determine whether to use other heat-using equipment for heat supply, or to respectively perform high-temperature or low-temperature heat supply without mixing.
Example 3
On the basis of the embodiment 2, the third port of the four-way regulating valve 6 is connected with the inlet of the high-temperature heat storage water tank 18 through the electric auxiliary heating device 13. Redundant low-temperature hot water at about 33 ℃ in the low-temperature heat storage water tank 5 enters the electric auxiliary heating device 13 through the four-way regulating valve 6, and the high-temperature hot water heated to about 55 ℃ is stored in the high-temperature heat storage water tank 18, so that high-temperature heat supply is realized.
Example 4
On the basis of the embodiment 3, a second port of the four-way regulating valve 6 is connected with low-temperature heat utilization equipment through a first water diversion mechanism; the low-temperature heat equipment comprises a ground anti-freezing protection device 9, an ice-coated hot water supply device 10 and a hot air supply device 12; the first water diversion mechanism comprises a water diverter I7, a heat exchanger II8 and a heat exchanger III 11;
the first port of the water separator I7 is connected with the second port of the four-way regulating valve 6, the second port is connected with the inlet of the heat exchanger II8, the outlet of the heat exchanger II8 is connected with the ground anti-freezing protection device 9, the third port is connected with the ice-coated hot water supply device 10, the fourth port is connected with the inlet of the heat exchanger III11, and the outlet of the heat exchanger III11 is connected with the heat supply air device 12.
After the four-way regulating valve 6 enters the water separator I7, low-temperature hot water at about 33 ℃ enters the heat exchanger II8 through the water separator I7 to exchange heat with air, and the hot air enters the ground anti-freezing protection device 9 for ground anti-freezing protection; low-temperature hot water at about 33 ℃ can also directly enter the ice-coated hot water supply device 10 through the water separator I7 and is used for supplying the ice-coated hot water; meanwhile, low-temperature hot water at about 33 ℃ can also enter a heat exchanger III11 through a water separator I7 to exchange heat with air, and the hot air finally enters the hot air supply device 12 to supply hot air to the skating rink.
The second port of the three-way regulating valve 19 is connected with high-temperature heat utilization equipment through a second water distribution mechanism; the high temperature heat using equipment includes a floor heating 22 and a domestic hot water supply 24; the second water diversion mechanism comprises a water diversion device II20, a heat exchanger IV21 and a water purifier 23; the first port of the water separator II20 is connected with the second port of the three-way regulating valve 19, the second port is connected with the inlet of the heat exchanger IV21, the outlet of the heat exchanger IV21 is connected with the floor heating 22, the third port is connected with the inlet of the water purifier 23, and the outlet of the water purifier 23 is connected with the domestic hot water supply 24.
High-temperature hot water at about 55 ℃ in the high-temperature heat storage water tank 18 enters a water separator II20 through a three-way regulating valve 19, and the water separator II20 conveys the high-temperature hot water at about 55 ℃ to a heat exchanger IV21 for heat exchange, so that the high-temperature hot water is used for providing space heating (underfloor heating, water radiators and the like) by a floor heating device 22; the water separator II20 can also send the high temperature hot water with the temperature of about 55 ℃ into the domestic hot water supply device 24 after being purified by the water purifier 23.
The water separator I7 and the water separator II20 disperse one path of inlet water into multiple paths of output, and are standard water separators capable of adjusting the flow of each loop.
Claims (6)
1. The utility model provides an indoor skating rink building waste heat recovery and heating system which characterized in that: comprises a waste water storage device (1) for storing waste water discharged into a sewer pipeline and an ice surface lower circulating pipeline (14) for recovering waste heat in the ice making process;
the filtering device I (2), the heat exchanger I (3), the heat pump (4) and the low-temperature heat storage water tank (5) are sequentially connected with the wastewater storage device (1);
a brine pump (15), an ice maker (16), a filtering device II (17) and a high-temperature heat storage water tank (18) which are sequentially connected with the under-ice circulation pipeline (14);
the low-temperature heat storage water tank (5) and the high-temperature heat storage water tank (18) realize low-temperature heat supply or/and high-temperature heat supply through a control mechanism.
2. The indoor rink building waste heat recovery and heating system of claim 1, characterized in that: the control mechanism comprises a four-way regulating valve (6), a three-way regulating valve (19), a three-way mixing valve (25) and an electromagnetic switch valve (26);
a first port of the four-way regulating valve (6) is connected with an outlet of the low-temperature heat storage water tank (5), a second port of the four-way regulating valve is connected with low-temperature heat utilization equipment in a skating rink, a third port of the four-way regulating valve is connected with an inlet of the high-temperature heat storage water tank (18), and a fourth port of the four-way regulating valve is connected with a first port of a three-way mixing valve (25);
a first port of the three-way regulating valve (19) is connected with an outlet of the high-temperature heat storage water tank (18), a second port of the three-way regulating valve is connected with high-temperature heat utilization equipment in a skating rink, and a third port of the three-way regulating valve is connected with a second port of the three-way mixing valve (25);
the third port of the three-way mixing valve (25) is connected with the inlet of an electromagnetic switch valve (26), and the outlet of the electromagnetic switch valve (26) is connected with a heat utilization device outside the skating field.
3. The indoor rink building waste heat recovery and heating system of claim 2, characterized in that: and a third port of the four-way regulating valve (6) is connected with an inlet of the high-temperature heat storage water tank (18) through an electric auxiliary heating device (13).
4. The indoor rink building waste heat recovery and heating system of claim 3, characterized in that: the second port of the four-way regulating valve (6) is connected with low-temperature heat utilization equipment through a first water distribution mechanism;
the low-temperature heat equipment comprises a ground anti-freezing protection device (9), an ice-coated hot water supply device (10) and a hot air supply device (12);
the first water diversion mechanism comprises a water diverter I (7), a heat exchanger II (8) and a heat exchanger III (11);
the first port of the water separator I (7) is connected with the second port of the four-way regulating valve (6), the second port is connected with the inlet of the heat exchanger II (8), the outlet of the heat exchanger II (8) is connected with the ground anti-freezing protection device (9), the third port is connected with the ice-coated hot water supply device (10), the fourth port is connected with the inlet of the heat exchanger III (11), and the outlet of the heat exchanger III (11) is connected with the heat supply air device (12).
5. The indoor rink building waste heat recovery and heating system of claim 4, characterized in that: the second port of the three-way regulating valve (19) is connected with high-temperature heat utilization equipment through a second water distribution mechanism;
the high-temperature heat equipment comprises a floor heating device (22) and a domestic hot water supply device (24);
the second water diversion mechanism comprises a water diversion device II (20), a heat exchanger IV (21) and a water purifier (23);
the first port of the water separator II (20) is connected with the second port of the three-way regulating valve (19), the second port is connected with the inlet of the heat exchanger IV (21), the outlet of the heat exchanger IV (21) is connected with the floor heating device (22), the third port is connected with the inlet of the water purifier (23), and the outlet of the water purifier (23) is connected with the domestic hot water supply device (24).
6. The indoor rink building waste heat recovery and heating system of claim 5, characterized in that: the water separator I (7) and the water separator II (20) disperse one path of inlet water into multiple paths of output, and the standard water separator can adjust the flow of each loop.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122218792.8U CN216010982U (en) | 2021-09-14 | 2021-09-14 | Indoor skating rink building waste heat recovery and heating system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202122218792.8U CN216010982U (en) | 2021-09-14 | 2021-09-14 | Indoor skating rink building waste heat recovery and heating system |
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| CN216010982U true CN216010982U (en) | 2022-03-11 |
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| CN202122218792.8U Active CN216010982U (en) | 2021-09-14 | 2021-09-14 | Indoor skating rink building waste heat recovery and heating system |
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