Central air conditioner transmission and distribution system

Abstract

The utility model provides a central air-conditioning transmission and distribution system. The system comprises a heat pump main machine, a buffer water tank communicated with a water outlet of the heat pump main machine, a water segregator communicated with a water outlet of the buffer water tank, an air conditioner main machine communicated with the water segregator through a layered and partitioned water supply pipe, and a water collector communicated with the air conditioner main machine through a layered and partitioned water return pipe. The water collector is communicated with a water return port of the buffer water tank; a first circulating pump is arranged on the layered and partitioned water supply pipe; a second circulating pump is arranged between a water outlet of the heat pump host and the buffer water tank, a first temperature sensor is arranged at a water inlet of the air conditioner host, a second temperature sensor is arranged at a water outlet of the air conditioner host, and the first temperature sensor and the second temperature sensor are connected with a control box. The utility model has the characteristics of accurate control, stability and energy conservation.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of heating central air conditioning, especially a central air conditioning delivery and distribution system. BACKGROUND

[0002] Water system central air conditioning system, generally adopt secondary circulation system more, so-called secondary circulation system, it is with buffer tank or distribution header as link, water system central air conditioning is divided into 2 independent circulation system, host computer and buffer tank circulation is an independent circulation system (make hot water / cold water), we call it primary circulation system (the function circulation pump is called primary pump);Buffer tank and fan coil and other terminal are another circulation system, that is, the air conditioning pump circulation system (or secondary pump) that we usually say.

[0003] In addition, the existing water system central air conditioning system is mainly applied in hotel and other commercial scenes, which is a centralized water-based central air conditioning system, which integrates the whole building or even several buildings into a whole energy supply station. All cooling and heating pipe networks of the whole building are connected together, and the distribution to each building through the distribution header is already very fine when there are many buildings. Several buildings use one pump or two pumps to deliver cold and hot water (or cold and hot medium). As long as there is a demand for air conditioning, even if some areas use heat, the large circulation pump of the centralized air conditioning system needs to start at full load, and the whole area is supplied with energy, which causes great energy waste of the air conditioning system, and it is impossible to achieve precise energy supply and on-demand energy supply. The delivery and distribution of energy in several buildings use extensive flood irrigation, and precise heating and energy-saving operation are not achieved. INVENTION CONTENTS

[0004] The technical problem to be solved by the utility model is to provide a central air conditioning delivery and distribution system with precise control and stable energy saving.

[0005] To solve the above technical problems, the technical scheme adopted by the utility model is:

[0006] A central air conditioning delivery and distribution system, comprising a heat pump host, a buffer tank communicated with a water outlet of the heat pump host, a water distributor communicated with a water outlet of the buffer tank, an air conditioning host communicated with the water distributor through a layered and zoned water supply pipe, and a water collector communicated with the air conditioning host through a layered and zoned return water pipe.

[0007] The water collector is communicated with the return water outlet of the buffer tank.

[0008] A first circulation pump is arranged on the layered and zoned water supply pipe.

[0009] A second circulation pump is arranged between the water outlet of the heat pump host and the buffer tank.

[0010] Furthermore, a first temperature sensor is provided at the water inlet of the air-conditioning host, and a second temperature sensor is provided at the water outlet of the air-conditioning host. The first temperature sensor and the second temperature sensor are connected to the control box.

[0011] Furthermore, the first circulating pump is a variable frequency pump, and the first circulating pump is connected to a control box.

[0012] Furthermore, a liquid level sensor is provided in the buffer water tank, the liquid level sensor is connected to the control box, and the second circulating pump is connected to the control box.

[0013] The beneficial effects of adopting the above technical solution are:

[0014] The present invention relates to a zoned and layered central air-conditioning precision distribution system, which maximizes the precision and energy-saving operation of the central air-conditioning. The layered and zoned independent pipe network and independent circulation pumps, compared with the large pump distribution system of the entire building, the water pump becomes smaller and the pipe diameter can be smaller. Compared with the large system, the investment does not increase. It can not only achieve more precise energy supply, but also achieve on-demand energy-saving operation, with a very high cost-effectiveness. Since air conditioning energy consumption generally accounts for more than 50% of the total energy consumption of the building, this form of layered and zoned independent air-conditioning energy supply has extremely high economic and technical value, can greatly reduce the operating energy consumption and energy supply accuracy of the central air-conditioning, and greatly improve the economic and technical efficiency of the water system central air-conditioning.

[0015] The utility model sets a water flow rate benchmark for the optimal heat exchange process with a heat exchange temperature difference of about 5°C for the main unit's inlet and outlet water; realizes the variable frequency and variable flow operation of the circulation pump by monitoring the heat exchange temperature difference of the main unit's inlet and outlet water; when the highest outlet water temperature is maintained under heating conditions, the main unit does not have high pressure protection; when the lowest outlet water temperature is maintained under cooling conditions, the main unit does not have low temperature protection; at the same time, it can also avoid installation problems involving the main unit such as damage to the heat exchanger due to insufficient water flow, etc., which can greatly reduce the operating energy consumption of the system, and can ensure the optimal heat exchange process with a heat exchange temperature difference of about 5°C, improve heat exchange efficiency, keep the outlet water temperature relatively stable, avoid high and low pressure protection, avoid problems such as heat exchange damage caused by too small heat exchange temperature difference, and has the advantages of energy-saving and consumption-reducing operation of the circulation pump, system stability, safety, and energy saving. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the structure of the present invention;

[0017] 1. Heat pump main unit, 2. Buffer water tank, 3. Water distributor, 4. Layered and partitioned water supply pipe, 5. Layered and partitioned return pipe, 6. Water collector, 7. First circulation pump, 8. Second circulation pump. DETAILED DESCRIPTION

[0018] The utility model provides a central air-conditioning distribution system, which includes a heat pump host 1, a buffer water tank 2 connected to the water outlet of the heat pump host 1, a water distributor 3 connected to the water outlet of the buffer water tank 2, an air-conditioning host connected to the water distributor 3 through a layered and partitioned water supply pipe 4, and a water collector 6 connected to the air-conditioning host through a layered and partitioned return pipe 5; the water collector 6 is connected to the return outlet of the buffer water tank 2; the buffer water tank 2 is arranged at a high-rise location in a building, and the building is divided and allocated according to the orientation, floor, and room, such as the room on the south side is set as S, the room on the north side is set as N, and then they are divided according to the floor and room number, for example, the rooms on the first floor on the south side are S-1-1, S-1-2, S-1-3, S-1-4..., the rooms on the second floor on the south side are S-2-1, S-2-2, S-2-3, S-2-4..., and so on. By analogy, the rooms in the south area are set as Snn, and the rooms in the north area are set as Nnn. Each room is equipped with an air-conditioning main unit. A first circulation pump 7 is set on the layered and partitioned water supply pipe 4. The first circulation pump 7 is connected to the air-conditioning main unit and the water collector through the layered and partitioned water supply pipe 4. The first circulation pump 7 can provide a heat source for the air-conditioning main unit installed in each room through the layered and partitioned water supply pipe 4. A second circulation pump 8 is set between the water outlet of the heat pump main unit 1 and the buffer water tank 2. The utility model adopts a zoned and layered central air-conditioning precision distribution system to maximize the precision and energy-saving operation of the central air-conditioning. The layered and partitioned independent pipeline network and independent circulation pump, compared with the large pump distribution system of the entire building, the water pump becomes smaller and the pipe diameter can be smaller. Compared with the large system, the investment does not increase. It can not only achieve more precise energy supply, but also achieve on-demand energy-saving operation, and has a very high cost performance. Since air conditioning energy consumption generally accounts for more than 50% of the total energy consumption of a building, the economic and technical value of this form of layered and zoned independent air conditioning energy supply is extremely high. It can greatly reduce the operating energy consumption and energy supply accuracy of central air conditioning, and greatly improve the economy and technology of water system central air conditioning.

[0019] A first temperature sensor is set at the water inlet of the air-conditioning main unit, and a second temperature sensor is set at the water outlet of the air-conditioning main unit. The first temperature sensor and the second temperature sensor are connected to the control box. The first circulating pump 7 adopts a variable frequency pump. The first circulating pump 7 is connected to the control box. The first temperature sensor is used to monitor the water inlet temperature of the air-conditioning main unit, and the second temperature sensor is used to monitor the water outlet temperature of the air-conditioning main unit. It is assumed that the temperature difference between the water inlet temperature and the water outlet temperature is set to ▲T≈5℃ as a benchmark; when the temperature sensor monitors the temperature difference between the water inlet temperature and the water outlet temperature ▲T≥5℃, it indicates that the water flow rate is too small. At this time, the frequency of the circulating water pump increases, and the water flow rate increases, so that the heat exchange temperature difference is close to the hot water flow rate of 5℃; conversely, the frequency of the circulating water pump decreases, and the water flow rate decreases, so that the heat exchange temperature difference is close to the hot water flow rate of 5℃, which realizes energy-saving and consumption-reducing operation of the circulating pump and improves the system stability, safety, energy saving and other advantages. The utility model sets the water flow rate benchmark for the optimal heat exchange process with a heat exchange temperature difference of about 5°C for the main unit's inlet and outlet water; realizes the variable frequency and variable flow operation of the circulation pump by monitoring the heat exchange temperature difference of the main unit's inlet and outlet water; when the highest outlet water temperature is maintained under heating conditions, the main unit does not have high pressure protection; when the lowest outlet water temperature is maintained under cooling conditions, the main unit does not have low temperature protection; at the same time, it can also avoid installation problems involving the main unit such as damage to the heat exchanger due to insufficient water flow, etc., which can greatly reduce the operating energy consumption of the system, and can ensure the optimal heat exchange process with a heat exchange temperature difference of about 5°C, improve heat exchange efficiency, keep the outlet water temperature relatively stable, avoid high and low pressure protection, avoid problems such as heat exchange damage caused by too small heat exchange temperature difference, and has the advantages of energy-saving and consumption-reducing operation of the circulation pump, system stability, safety, and energy saving.

[0020] A liquid level sensor is provided in the buffer water tank 2, and the liquid level sensor is connected to the control box. The second circulating pump 8 is connected to the control box. When the liquid level sensor detects that the liquid level in the buffer water tank 2 drops to the set water level, the control box controls the second circulating pump 8 to start, replenishing water to the buffer water tank 2 to keep it at a certain level. The buffer water tank 2 is set on a high floor to replenish water for the water collector 6 at a lower position by utilizing the height difference. The water in the water collector 6 is supplied to the air-conditioning host in different room locations through the first circulating pump 7.

[0021] The above first temperature sensor, second temperature sensor, liquid level sensor, control box, first circulation pump, second circulation pump, etc. can be selected from existing models on the market according to the requirements of the usage scenario, as long as they can meet the usage requirements of the present utility model.

[0022] The system works as follows:

[0023] Due to changes in external factors such as ambient temperature, the condensing temperature (or evaporating temperature) varies. This not only causes the difference in temperature ▲T between the main unit's inlet and outlet water temperatures to change, but in extreme operating conditions, it can also cause the outlet water temperature to be too high (or too low), potentially leading to high-temperature and high-pressure protection / low-temperature safety protection issues. To prevent high and low temperatures under extreme operating conditions, an upper limit for high-pressure and high-temperature protection (or a lower limit for low-temperature antifreeze cycles) is set, and the flow rate is adaptively adjusted to maintain a safe heat exchange state in the main unit that is less susceptible to high-temperature, high-pressure, and low-temperature antifreeze cycles. Temperature sensors are provided at the water inlet and outlet, respectively, to enable high-temperature and high-pressure protection and low-temperature safety protection settings. For example, if the outlet temperature of a certain air conditioner approaches the high-pressure and high-temperature protection threshold of 55°C, a high-pressure protection issue may occur. Although the difference in temperature ▲T between the main unit's inlet and outlet water temperatures is approximately 5°C, to prevent this issue, the first circulating pump 7 must increase its operating frequency and circulation flow rate to keep the outlet temperature of the main unit 3 below the threshold, ensuring safe and stable operation of the main unit.

[0024] On the contrary, in order to avoid low-temperature antifreeze protection problems such as low water temperature during the heat exchange cycle of the air-conditioning host, for example, when the evaporation temperature of a certain air-conditioning host 3 is close to the low-pressure and low-temperature antifreeze protection critical value such as 5°C, although the inlet and outlet water temperature difference of the host is ▲T≈5°C at this time, in order to avoid low-pressure and low-temperature protection problems, the first circulation pump 7 must also increase the operating frequency and increase the circulation flow rate so that the outlet temperature of the air-conditioning host 3 is higher than the critical value for safe operation.

[0025] Layered heating / cooling is the prerequisite for precise on-demand heating and cooling. For rooms on floors that do not require heating or cooling, the first circulating pump 7 will not be started. Only for rooms on each floor that require air conditioning, the corresponding first circulating pump 7 will be started. Compared with the large-scale flooding type centralized central air-conditioning distribution system, it will not cause ineffective distribution and is relatively energy-efficient.

[0026] Affected by sunlight, the cooling and heating loads of buildings in the south and north areas are quite different in winter and summer. After the air-conditioned buildings are divided into north and south areas, in order to achieve the same air-conditioning effect, the supply / return water temperature, water pump operating time, required water flow, operating time, etc. required by the north and south areas all show obvious differences. This provides conditions for energy-saving operation of the north and south areas of the air-conditioned buildings. For example, in the summer, the air conditioning load in the north area of ​​the building is small, which can reduce the flow of the water pump, thus greatly saving the power consumption of the circulating water pump distribution system and the power consumption of the main unit; for another example, in the winter, the rooms in the south area are affected by sunlight, and the room heat load is small. The heat load during the day in winter is much smaller than the heat load of the buildings in the north area. The water temperature of the water supply in the south area is low and the water pump operation time is short. In winter, the heating energy consumption in the south area can be greatly reduced; if the north and south areas are not divided into different areas for cooling and heating, as long as the temperature of any room in the south or north area does not meet the requirements, the central air conditioning pump set up needs to run at full load for the entire building, resulting in energy waste of the circulating water pump; at the same time, in the south or north area, which can be heated at low temperature or cooled at high temperature, the energy efficiency of the main unit operation is much lower than the energy efficiency of zoned and layered heating / cooling in the centralized air conditioning mode using a large pump circulation. When a room in the south or north area of ​​the utility model needs air conditioning, the corresponding circulating pump starts the cycle, and automatically determines the operation time and the supply / return water temperature of the air conditioner according to the influence of sunlight on the south and north areas and the changes in indoor temperature. For rooms that do not require air conditioning, the circulation pump is in standby mode. The first circulation pump 7 pumps water from the manifold 3 through the independent stratified and zoned water supply pipes 4 to the zoned and zoned rooms Snn or Nnn that require air conditioning. After dissipating heat / cooling at the corresponding room terminals, the water returns to the manifold 6 through the independent stratified and zoned return pipes 5, completing the air conditioning circulating water cycle.

[0027] The above description of the disclosed embodiments will enable one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not limited to the embodiments shown herein but is intended to conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A central air-conditioning distribution system, characterized in that: It comprises a heat pump main unit (1), a buffer water tank (2) connected to the water outlet of the heat pump main unit (1), a water distributor (3) connected to the water outlet of the buffer water tank (2), an air conditioning main unit connected to the water distributor (3) via a layered and partitioned water supply pipe (4), and a water collector (6) connected to the air conditioning main unit via a layered and partitioned water return pipe (5); The water collector (6) is connected to the return water port of the buffer water tank (2); A first circulation pump (7) is provided on the layered and partitioned water supply pipe (4); A second circulation pump (8) is provided between the water outlet of the heat pump main unit (1) and the buffer water tank (2).

2. A central air-conditioning distribution system according to claim 1, characterized in that: A first temperature sensor is provided at the water inlet of the air-conditioning host, and a second temperature sensor is provided at the water outlet of the air-conditioning host. The first temperature sensor and the second temperature sensor are connected to the control box.

3. A central air-conditioning distribution system according to claim 2, characterized in that: The first circulating pump (7) is a variable frequency pump, and the first circulating pump (7) is connected to a control box.

4. A central air-conditioning distribution system according to claim 1, characterized in that: A liquid level sensor is provided in the buffer water tank (2), the liquid level sensor is connected to the control box, and the second circulating pump (8) is connected to the control box.

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