Energy-saving efficient medium and low temperature cold water coupling cold supply system

Abstract

The utility model relates to the technical field of clean composite energy centralized energy supply systems, and discloses an energy-saving efficient medium-low temperature cold water coupling cold supply system. The utility model relates to an energy-saving efficient medium and low temperature cold water coupling cold supply system, which comprises refrigeration equipment, namely conventional refrigeration equipment, medium temperature refrigeration equipment, and cold release equipment, namely a fresh air handling unit, a dry type fan coil, a capillary tube and a floor radiator, wherein a cold water outlet of the conventional refrigeration equipment is connected with a cold water inlet of the fresh air handling unit through a conveying system; a cold water outlet of the fresh air handling unit is connected with a cold water inlet of the tail end cold release equipment through a conveying system, a cold water outlet of the dry type fan coil is connected with a cold water inlet of the capillary tube and the floor radiation through a conveying system, and a cold water outlet of the capillary tube and the floor radiation is connected with a cold water outlet of the medium-temperature refrigeration equipment through a conveying system. A cold water outlet of the medium-temperature refrigeration equipment is connected with a cold water inlet of the conventional refrigeration equipment through a conveying system, the conveying system is a middle pipeline system, and a circulating water pump is arranged in the middle pipeline system.

Description

Technical Field

[0001] The present application belongs to the technical field of clean composite energy centralized energy supply systems, and specifically relates to an energy-saving and high-efficiency medium and low-temperature cold water coupled cooling system. Background Art

[0002] Currently, conventional refrigeration systems mostly use low-temperature water supply systems, with supply and return water temperatures ranging from 7°C to 12°C. Cooling devices primarily consist of fresh air units and fan coil units, both of which provide cooling and dehumidification functions. Traditional terminal cooling devices require a separate condensate drainage system.

[0003] Traditional central air conditioning uses parallel operation for cooling and cooling-dissipating equipment. All cooling equipment must operate to meet peak load demands, resulting in unnecessary energy consumption even when the actual load is low. Cooling equipment typically has a supply water temperature of 7°C and a return water temperature of 12°C, with a supply-return temperature difference of 5°C. The intermediate piping system requires a circulating water pump as a power system. The small supply-return temperature difference means that the water pump and cooling system require more operating time and energy to maintain system stability and efficiency. Furthermore, conventional cooling system designs often struggle to cope with load fluctuations. In the event of large load fluctuations, the system responds slowly, leading to large fluctuations in indoor temperature and humidity. At low or partial loads, the system is inefficient, making energy-saving operation difficult. Summary of the Invention

[0004] The present application provides an energy-saving and high-efficiency medium and low-temperature cold water coupled cooling system to solve at least one of the above-mentioned technical problems.

[0005] The technical solutions adopted in this application are:

[0006] An energy-saving and efficient medium and low temperature cold water coupled cooling system includes conventional refrigeration equipment, fresh air units and fan coils. The cold water outlet of the conventional refrigeration equipment is connected to the cold water inlet of the terminal cooling release equipment through a conveying system. The terminal cooling release equipment includes a fresh air unit, a dry fan coil, a capillary system or a floor radiation system connected in series through a cooling water pipe. The cold water outlet of the terminal cooling release equipment is connected to the cold water inlet of the medium temperature refrigeration equipment through a conveying system. The cold water outlet of the medium temperature refrigeration equipment is connected to the cold water inlet of the conventional refrigeration equipment through a conveying system. The conveying system is an intermediate pipeline system, and a circulating water pump is provided in the intermediate pipeline system.

[0007] The cooling system is a roof capillary network cooling system. The roof capillary network system includes a roof, a capillary network, an insulation layer on the back of the capillary network, and a control system. The roof capillary network system is connected in series with the medium-temperature refrigeration equipment. The water supply temperature difference of the roof capillary network system is 4℃-6℃, the water supply temperature is 16℃, and the return water temperature is 20℃-22℃.

[0008] The cooling system is a floor radiation cooling system, which includes the floor, cold water pipes under the floor, an insulation layer under the cold water pipes, and a control system. The floor radiation cooling system is connected in series with the medium-temperature refrigeration equipment. The water supply temperature difference of the floor radiation cooling system is 5℃-8℃, the water supply temperature is 16℃, and the return water temperature is 21℃-24℃.

[0009] The cooling system is a wall capillary cooling system. The wall capillary network system includes the wall, the capillary network, the insulation layer on the back of the capillary network and the control system. The wall capillary network system is connected in series with the medium-temperature refrigeration equipment. The water supply temperature difference of the wall capillary cooling system is 4℃-6℃, the water supply temperature is 16℃, and the return water temperature is 20℃-22℃.

[0010] The circulating water pump is a low-power variable frequency water pump with a variable frequency power of 10%-100%. The system adopts a large temperature difference and small flow method, and the supply and return water temperature difference reaches 14°C.

[0011] The medium-temperature refrigeration equipment includes a compressor, a condenser connected to the compressor exhaust pipe, an expansion valve, an evaporator, and a control system. The expansion valve inlet is connected to the condenser outlet, the expansion valve outlet is connected to the evaporator inlet, and the evaporator is connected to the compressor through an air suction pipe. After the medium-temperature control equipment discharges water, it flows through the intermediate pipeline system to the conventional refrigeration equipment.

[0012] The fresh air unit is installed in the equipment room, the terminal fan coil is set on the ceiling, the fan coil supply and return air outlets are set at different positions in the room, the supply air outlet is set near the window, and the return air outlet is set at a higher position in the room.

[0013] Due to the adoption of the above technical solution, the beneficial effects achieved by this application are as follows:

[0014] 1. The system adopts multiple cooling units in series and adopts the medium-temperature cooling concept. Under the same cooling temperature, the medium-temperature refrigeration equipment system saves more than 20% more energy than the low-temperature refrigeration equipment system.

[0015] 2. The system uses fresh air units for dehumidification, and there is no need to install condensate pipes in each room, which can avoid problems such as "mold" in the decoration version in the later stage, and fresh air ventilation can improve the air quality in each room.

[0016] 3. The system adopts a large temperature difference and small flow method. The supply and return water temperature difference is 14°C. The circulating pump power required by the system is smaller than that of the traditional system, and the system energy saving is more than 30%. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0018] Figure 1 This application provides a flow chart of an energy-saving and high-efficiency medium and low-temperature cold water coupled cooling system;

[0019] Figure 2 This is a flow chart of a traditional cooling system;

[0020] 1. Conventional refrigeration equipment; 2. Fresh air unit; 3. Dry fan coil; 4. Capillary tube and floor radiation; 5. Medium-temperature refrigeration equipment; 6. Circulation pump; 7. Condensate discharge pipe. DETAILED DESCRIPTION

[0021] In order to more clearly illustrate the overall concept of the present application, a detailed description is given below in an illustrative manner in conjunction with the accompanying drawings.

[0022] The following description sets forth many specific details to facilitate a thorough understanding of the present application. However, the present application may also be implemented in other ways than those described herein, and therefore, the scope of protection of the present application is not limited by the specific embodiments disclosed below. It should be noted that the embodiments of the present application and the features of each embodiment may be combined with each other unless there is a conflict.

[0023] In addition, in the description of the present application, it should be understood that the terms "top", "bottom", "inside", "outside", "axial", "radial", "circumferential", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on the present application.

[0024] In this application, unless otherwise expressly specified or limited, terms such as "installed," "connected," "connect," and "fixed" should be understood in a broad sense. For example, they may refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection, or communication; direct connection or indirect connection through an intermediate medium; and internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0025] In this application, unless otherwise expressly specified and limited, a first feature "above" or "below" a second feature may be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in an appropriate manner in any one or more embodiments or examples.

[0026] Embodiment 1;

[0027] An energy-saving and efficient medium and low temperature cold water coupled cooling system includes a conventional refrigeration device 1, a fresh air unit 2 and a fan coil unit. The cold water outlet of the conventional refrigeration device 1 is connected to the cold water inlet of the terminal cooling device through a conveying system. The terminal cooling device includes a fresh air unit 2, a dry fan coil unit 3, a capillary system or a floor radiation system connected in series through a cooling water pipe. The cold water outlet of the terminal cooling device is connected to the cold water inlet of the medium temperature refrigeration device 5 through a conveying system. The cold water outlet of the medium temperature refrigeration device 5 is connected to the cold water inlet of the conventional refrigeration device 1 through a conveying system. The conveying system is an intermediate pipeline system, and a circulating water pump is provided in the intermediate pipeline system.

[0028] The cooling system is a top plate capillary network cooling system. The top plate capillary network system includes a top plate, a capillary network, an insulation layer arranged on the back of the capillary network, and a control system. The top plate capillary network system is connected in series with the medium-temperature refrigeration equipment 5. The water supply temperature difference of the top plate capillary network system is 4°C-6°C, the water supply temperature is 16°C, and the return water temperature is 20°C-22°C.

[0029] The medium-temperature refrigeration equipment 5 includes a compressor, a condenser connected to the compressor exhaust pipe, an expansion valve, an evaporator and a control system. The expansion valve inlet is connected to the condenser outlet, the expansion valve outlet is connected to the evaporator inlet, and the evaporator is connected to the compressor through an intake pipe. After the medium-temperature control equipment discharges water, it flows to the next system through the intermediate pipeline system, and a circulating water pump is installed inside the intermediate pipeline system as a power system to transport the cooling capacity required by the system so that the system can be circulated repeatedly.

[0030] By adopting the above technical solution, cold water is provided by conventional refrigeration equipment 1 and a medium-temperature chiller. Through a circulating water pump and piping system, the cold water is transported to the ceiling via the fresh air unit 2 and the dry fan coil unit 3. The fresh air unit 2 bears the entire indoor wet load and part of the sensible heat load, while the dry fan coil unit 3 bears part of the indoor sensible heat load. The cold water circulates within the capillary network, bearing part of the indoor sensible heat load, exchanging heat with the ceiling to absorb indoor heat and lower the indoor temperature. After the heat exchange, the cold water temperature rises and returns to the medium-temperature refrigeration equipment 5 for re-refrigeration, completing the cycle. The ceiling capillary cooling system uses a capillary network arranged on the ceiling to circulate cold water for heat exchange, achieving cooling through radiation and natural convection. The ceiling capillary cooling system achieves uniform cooling and a more balanced temperature distribution. The system also operates quietly without fan noise, occupying only ceiling space, not floor or wall space. It is suitable for offices, conference rooms, theaters, and other places that require a quiet and comfortable environment.

[0031] By configuring the medium-temperature refrigeration equipment 5 and the terminal cold-releasing equipment in series, the system realizes an operation mode of large temperature difference and small flow, reduces the consumption of the water pump, and improves the utilization efficiency of the cold source.

[0032] The circulating water pump is a low-power variable frequency water pump with a variable frequency power of 10%-100%. The system adopts a large temperature difference and small flow method, and the supply and return water temperature difference reaches 14°C.

[0033] The fresh air unit 2 is installed in the equipment room, the terminal fan coil is set on the ceiling, the fan coil supply air outlet and return air outlet are set at different positions in the room, the supply air outlet is set near the window, and the return air outlet is set at a higher position in the room.

[0034] In a typical embodiment, the terminal fan coil unit is installed in the ceiling, close to the area to be cooled to improve efficiency. In other embodiments, the terminal fan coil unit can also be installed under the floor or on the wall. The supply and return air vents of the terminal fan coil unit are placed in different locations in the room to ensure uniform air circulation and temperature distribution. The supply air vent is placed near the window to offset external heat load, and the return air vent is placed higher in the room to facilitate the return of hot air to the terminal fan coil unit for reprocessing.

[0035] Example 2:

[0036] Description of parts that are the same as those in the first embodiment will be omitted and will be given the same reference numerals.

[0037] The cooling system is a floor radiation cooling system, which includes a floor, a cold water pipe under the floor, an insulation layer under the cold water pipe, and a control system. The floor radiation cooling system is connected in series with the medium-temperature refrigeration equipment 5. The water supply temperature difference of the floor radiation cooling system is 5°C-8°C, the water supply temperature is 16°C, and the return water temperature is 21°C-24°C.

[0038] By adopting this technical solution, cold water is provided by conventional refrigeration equipment 1 and a medium-temperature chiller. Through a circulating water pump and piping system, the cold water is transported to the ground through fresh air unit 2 and dry fan coil units 3. Fresh air unit 2 bears the entire indoor wet load and part of the sensible heat load, while dry fan coil units 3 bear part of the indoor sensible heat load. The cold water circulates within the radiant floor pipe network, bearing part of the indoor sensible heat load, exchanging heat with the ground, absorbing indoor heat and lowering the indoor temperature. After the heat exchange, the cold water temperature rises and returns to the medium-temperature refrigeration equipment 5 for re-refrigeration, completing the cycle. This radiant floor cooling system is suitable for places requiring comfortable and uniform cooling, such as residences, offices, and large public buildings.

[0039] Example 3:

[0040] Description of parts that are the same as those in the first embodiment will be omitted and will be given the same reference numerals.

[0041] The cooling system is a wall capillary cooling system. The wall capillary network system includes a wall, a capillary network, an insulation layer on the back of the capillary network, and a control system. The wall capillary network system is connected in series with the medium-temperature refrigeration equipment 5. The water supply temperature difference of the wall capillary cooling system is 4°C-6°C, the water supply temperature is 16°C, and the return water temperature is 20°C-22°C.

[0042] By adopting the above technical solution, cold water is provided by conventional refrigeration equipment 1 and a medium-temperature chiller. Through a circulating water pump and piping system, the cold water is transported to the wall through the fresh air unit 2 and the dry fan coil 3. The fresh air unit 2 bears all the indoor wet load and part of the sensible heat load, while the dry fan coil 3 bears part of the indoor sensible heat load. The cold water circulates within the wall capillary network, bearing part of the indoor sensible heat load, exchanging heat with the wall to absorb indoor heat and lower the indoor temperature. After the heat exchange, the cold water temperature rises and returns to the medium-temperature refrigeration equipment 5 for re-refrigeration to complete the cycle. The wall capillary cooling system arranges a capillary network within the wall, circulates cold water for heat exchange, and achieves cooling through radiation and natural convection. By adopting the wall capillary cooling system, it can be flexibly installed on different walls according to the room layout. The wall capillary cooling system is completely hidden inside the wall, without affecting the interior decoration style. The capillary network has a large heat exchange area and a significant cooling effect. It is suitable for places with high requirements on temperature control and indoor aesthetics, such as family residences, hotels, hospitals, etc.

[0043] System working principle: Figure 1 As shown, the cooling water supply temperature of the conventional refrigeration equipment 1 is 7°C, and the 7°C cold water is transported to the fresh air unit 2 through the system circulating water pump. The fresh air unit 2 bears all the wet load and part of the cooling load of the terminal system. The heat exchange temperature difference in the fresh air unit 2 is 5°C, and the outlet water temperature is 12°C. It is transported through the system pipeline to the next terminal system - the terminal dry fan coil 3. The terminal dry fan coil 3 is only responsible for part of the system's cooling load and does not bear the wet load. The heat exchange temperature difference in the terminal dry fan coil 3 is 4°C, and the outlet water temperature is 16°C. It is transported through the system pipeline to the next terminal system - the ceiling, wall capillary network system or the floor radiation system. The heat exchange temperature difference in the ceiling, wall capillary network system or the floor radiation system is 5°C, and the outlet water temperature is 21°C. It is transported through the system pipeline to the medium-temperature refrigeration equipment 5. The medium-temperature refrigeration equipment 5 exchanges heat through the system refrigerant, and the internal heat exchange temperature difference is 7°C, outputting 14°C cold water.

[0044] Anything not described in this application can be achieved by adopting or drawing on existing technologies.

[0045] The various embodiments in this specification are described in a progressive manner, and the same or similar parts between the various embodiments can be referred to each other. Each embodiment focuses on the differences from other embodiments.

[0046] The foregoing is merely an embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various changes and variations. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present application should all be included within the scope of the claims of the present application.

Claims

1. An energy-saving and high-efficiency medium- and low-temperature cold water coupled cooling system, comprising conventional refrigeration equipment (1), a fresh air unit (2) and a fan coil unit, characterized in that: The cold water outlet of the conventional refrigeration equipment (1) is connected to the cold water inlet of the terminal cooling device through a conveying system. The terminal cooling device includes a fresh air unit (2), a dry fan coil (3), a capillary system or a floor radiation system connected in series through a cooling water pipe. The cold water outlet of the terminal cooling device is connected to the cold water inlet of the medium-temperature cooling device (5) through a conveying system. The cold water outlet of the medium-temperature cooling device (5) is connected to the cold water inlet of the conventional refrigeration equipment (1) through a conveying system. The conveying system is an intermediate pipeline system. A circulating water pump is provided in the intermediate pipeline system.

2. The cooling system according to claim 1, wherein: The terminal cooling device is a top plate capillary network system, which includes a top plate, a capillary network, an insulating layer arranged on the back of the capillary network, and a control system. The top plate capillary network system is connected in series with the medium-temperature refrigeration device (5). The water supply temperature difference of the top plate capillary network system is 4°C-6°C, the water supply temperature is 16°C, and the return water temperature is 20°C-22°C.

3. The cooling system according to claim 1, wherein: The terminal cooling device is a floor radiant cooling system, which includes a floor, a cold water pipe arranged under the floor, an insulating layer arranged under the cold water pipe, and a control system. The floor radiant cooling system is connected in series with the medium-temperature refrigeration equipment (5). The floor radiant cooling system has a water supply temperature difference of 5°C-8°C, a water supply temperature of 16°C, and a return water temperature of 21°C-24°C.

4. The cooling system according to claim 1, wherein: The terminal cooling device is a wall capillary network system, which includes a wall, a capillary network, an insulating layer arranged on the back of the capillary network, and a control system. The wall capillary network system is connected in series with the medium-temperature refrigeration device (5). The water supply temperature difference of the wall capillary network system is 4°C-6°C, the water supply temperature is 16°C, and the return water temperature is 20°C-22°C.

5. The cooling system according to claim 1, wherein: The circulating water pump is a relatively low-power variable frequency water pump with a variable frequency power of 10%-100%. The system adopts a large temperature difference and small flow method, and the supply and return water temperature difference reaches 14°C.

6. The cooling system according to claim 1, wherein: The medium-temperature refrigeration equipment (5) includes a compressor, a condenser connected to the compressor exhaust pipe, an expansion valve, an evaporator, and a control system. The expansion valve inlet is connected to the condenser outlet, and the expansion valve outlet is connected to the evaporator inlet. The evaporator is connected to the compressor via an air intake pipe. After the water is discharged from the medium-temperature refrigeration equipment (5), it flows to the conventional refrigeration equipment (1) through the intermediate pipeline system.

7. The cooling system according to claim 1, wherein: The fresh air unit (2) is installed in the equipment room, the coil of the fresh air unit (2) is arranged on the ceiling, the air supply port and the air return port of the coil of the fresh air unit (2) are arranged at different positions in the room, the air supply port is arranged near the window, and the air return port is arranged at a higher position in the room.

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