CN205079368U - Cold and hot source system of water source VRF air conditioner - Google Patents

Abstract

The utility model relates to a water source VRF air-conditioning cold and heat source system; it includes a water source VRF air-conditioning cold and heat source system and a matching water source VRF air-conditioning control system; it includes a closed cooling tower, an auxiliary heat source-low temperature air-cooled heat pump unit, water -Water heat exchanger, water source VRF air conditioner outdoor unit, water source VRF air conditioner indoor unit, air-cooled heat pump side circulating water pump, air conditioner water loop circulating water pump, pipeline valve parts; the water source VRF air conditioner cold and heat source system set supporting The water source VRF air conditioning control system includes a terminal processor and an automatic control cable; the terminal processor is connected to the water source VRF air conditioning cold and heat source system through an automatic control cable. When configuring water source VRF air conditioner outdoor units with more than two air conditioning zones, the water source VRF air conditioner cold and heat source system also includes water separators and water collectors. It has the advantages of health, comfort, green, environmental protection, energy saving and high efficiency.

Description

Water source VRF air conditioning cold and heat source system

technical field

The utility model relates to an air conditioner cold and heat source system and its control system, in particular to a water source VRF air conditioner cold and heat source system, which includes a water source VRF air conditioner cold and heat source system and a matching water source VRF air conditioner control system. The English full name of VRF is VariablerefrigerantFlow, which means variable refrigerant flow.

Background technique

With the development of my country's economy and society and the increasing pressure on environmental resources, the situation of energy conservation and emission reduction is becoming increasingly severe. The proportion of building energy consumption in the total energy consumption of society is increasing year by year. According to the calculation of the Ministry of Housing and Urban-Rural Development, around 2030, my country's building energy consumption will account for 30%-40% of the total energy consumption, reaching the current proportion of Europe and the United States, surpassing industrial energy consumption, and becoming the world's largest energy consumption. The largest energy-consuming household in society. At present, the problem of high energy consumption of large public buildings in my country is becoming more and more prominent. According to the statistical analysis of relevant experts, the annual power consumption of office buildings of state agencies and large public buildings accounts for about 22% of the total power consumption of cities and towns in the country, and the power consumption per square meter is It is 10 to 20 times that of ordinary residences, and 1.5 to 2 times that of similar buildings in developed countries such as Europe and Japan. It is an indisputable fact and a common phenomenon that the energy efficiency of energy systems in large public buildings in my country is generally low and energy waste is serious. . Therefore, it is the top priority to do a good job in energy conservation in the construction field, especially in the field of public buildings. The energy consumption of air conditioning accounts for more than 60% of the total energy consumption of public buildings. It is a major energy consumer of public buildings and a key system for building energy conservation. The promotion of green buildings and the realization of energy conservation and emission reduction have become important propositions facing the current government. The energy-saving design of air-conditioning systems should attract the attention of HVAC design engineers, and they are facing an urgent task.

Contents of the invention

The purpose of this utility model is to overcome the shortage of existing technologies and irregular concepts, and provide a healthy, comfortable, green, environmental protection, energy-saving and efficient water source VRF air-conditioning cold and heat source system.

The technical solution adopted by the utility model is: through technical integration, a complete set of water source VRF air conditioning cold and heat source system serving for the end of the water source VRF air conditioning unit is formed, and a matching water source VRF air conditioning control system is set to realize the water source VRF air conditioning cold and heat source system Efficient and reliable operation.

1. Water source VRF air conditioning cold and heat source system

(1) The cold and heat source system of water source VRF air conditioner includes closed cooling tower 1, auxiliary heat source-low temperature air-cooled heat pump unit 2, water-water heat exchanger 3, water source VRF air conditioner outdoor unit 4, water source VRF air conditioner indoor unit 5. Air-cooled heat pump side circulating water pump 6, air-conditioning water loop circulating water pump 7, pipeline valve parts 8;

The air-conditioning water loop side of the closed cooling tower 1, the water-water heat exchanger 3, the water source VRF air-conditioning outdoor unit 4, and the air-conditioning water loop circulating water pump 7 are connected by water pipes to form an air-conditioning water loop;

The auxiliary heat source-low temperature air-cooled heat pump unit 2, the air-cooled heat pump side of the water-water heat exchanger 3, and the circulating water pump 6 on the air-cooled heat pump side are connected through water pipes to form a loop on the air-cooled heat pump side;

The air-conditioning water loop and the air-cooled heat pump side loop are provided with pipeline valves 8, and the pipeline valves 8 include an electric switch valve 81, an electric three-way regulating valve 82, an electric regulating valve 83, a water flow switch 84, and a flow sensor 85. Temperature sensor 86;

The water source VRF air conditioner outdoor unit 4 and the water source VRF air conditioner indoor unit 5 are connected through refrigerant pipes;

1.1 Water source The specific connection method of the air-conditioning water loop of the VRF air-conditioning cold and heat source system is as follows:

(a) The circulating water of the air-conditioning water loop is pressurized by the circulating water pump 7 of the air-conditioning water loop, connected to the water source VRF air-conditioning outdoor unit 4, and the circulating water returns to the circulating water pump 7 after heat exchange; VRF air conditioner outdoor units 4 are equipped with corresponding electric switch valves and water flow switches;

(b) The pipelines connected to the water source VRF air conditioner outdoor unit 4 are the circulating water return main pipe and the circulating water supply main pipe respectively. Two branch pipes are arranged on the circulating water return main pipe and the circulating water supply main pipe: Cooling tower 1, and corresponding electric on-off valves, water flow switches, and temperature sensors are set on the pipeline; another branch pipe is connected to the air-conditioning water loop side of water-water heat exchanger 3, and corresponding electric on-off valves, Electric three-way regulating valve, temperature sensor; the circulating water treated by the closed cooling tower 1 or the water-water heat exchanger 3 is connected to the water source VRF air conditioner outdoor unit 4 through the main water supply pipe connected to the water source VRF air conditioner outdoor unit 4, and An air-conditioning water loop circulating water pump 7 is provided on the main water supply pipe;

(c) A temperature sensor is installed on the circulating water supply main pipe; a flow sensor and a temperature sensor are installed on the circulating water return main pipe; an electric regulating valve is installed between the circulating water supply main pipe and the return water main pipe.

(d) The air-conditioning water loop circulating water pump 7 belongs to the circulating power of the water system, and the specific setting position can be changed according to the actual situation.

(2) When two or more water source VRF air conditioner outdoor units 4 are configured, the water source VRF air conditioner cold and heat source system also includes a water separator 9 and a water collector 10 .

The closed cooling tower 1, the air-conditioning water loop side of the water-water heat exchanger 3, the water source VRF air-conditioning outdoor unit 4, the air-conditioning water loop circulating water pump 7, the water separator 9, and the water collector 10 pass through Water pipes are connected to form an air-conditioning water loop;

Wherein, the air-conditioning circulating water prepared by the water source VRF air-conditioning system is distributed to the water source VRF air-conditioning outdoor units 4 of multiple air-conditioning partitions through the water separator 9 and the water collector 10;

The auxiliary heat source-low temperature air-cooled heat pump unit 2, the air-cooled heat pump side of the water-water heat exchanger 3, and the circulating water pump 6 on the air-cooled heat pump side are connected through water pipes to form a loop on the air-cooled heat pump side;

The air-conditioning water loop and the air-cooled heat pump side loop are provided with pipeline valves 8, and the pipeline valves 8 include an electric switch valve 81, an electric three-way regulating valve 82, an electric regulating valve 83, a water flow switch 84, and a flow sensor 85. Temperature sensor 86;

The water source VRF air conditioner outdoor unit 4 and the water source VRF air conditioner indoor unit 5 are connected through refrigerant pipes.

1.2 Water source The specific connection method of the air-conditioning water loop of the VRF air-conditioning cold and heat source system is as follows:

(a) The circulating water of the air-conditioning water loop is pressurized by the circulating water pump 7 of the air-conditioning water loop, connected to the water separator 9, and distributed to the water source VRF air-conditioning outdoor unit 4 of each air-conditioning partition, after the circulating water passes through the heat exchange Back to the water collector 10; the water source VRF air-conditioning outdoor unit 4 of each air-conditioning zone is equipped with a corresponding electric switch valve and water flow switch;

(b) The water return of the water collector 10 is provided with two branch pipes; one branch pipe is connected to the closed cooling tower 1, and corresponding electric on-off valves, water flow switches, and temperature sensors are set on the pipeline; the other branch pipe is connected to the water -The air-conditioning water loop side of the water heat exchanger 3, and the corresponding electric on-off valve, electric three-way regulating valve, and temperature sensor are set on the pipeline; the circulation processed by the closed cooling tower 1 or the water-water heat exchanger 3 The water is connected to the air-conditioning water loop circulating water pump 7 through a water pipe;

(c) A temperature sensor is arranged before the water separator 9; a flow sensor and a temperature sensor are arranged behind the water collector 10; an electric regulating valve is arranged between the water separator 9 and the water collector 10;

(d) The air-conditioning water loop circulating water pump 7 belongs to the circulating power of the water system, and the specific setting position can be changed according to the actual situation.

1.2 The specific connection method of the air-cooled heat pump side loop of the water source VRF air-conditioning cold and heat source system is as follows:

The circulating water of the air-cooled heat pump side loop is pressurized by the air-cooled heat pump side circulating water pump 6, and then connected to the auxiliary heat source-low temperature air-cooled heat pump unit 2, the air-cooled heat pump side of the water-water heat exchanger 3, and then connected to The circulating water pump 6 on the side of the air-cooled heat pump forms a loop on the side of the air-cooled heat pump; the auxiliary heat source-low temperature air-cooled heat pump unit 2 is equipped with a corresponding electric switch valve, water flow switch, and temperature sensor; the air-cooled heat pump of the water-water heat exchanger 3 An electric switch valve is installed on the side loop side; a temperature sensor and a flow sensor are installed on the water supply main pipe and the return water main pipe;

The air-cooled heat pump side circulating water pump 6 belongs to the circulating power of the water system, and the specific setting position can be changed according to the actual situation;

2. Water source VRF air conditioning control system

The water source VRF air-conditioning cold and heat source system is provided with a supporting water source VRF air-conditioning control system, including a terminal processor 11 and an automatic control cable 12; the terminal processor 11 is connected to the water source VRF air-conditioning cold and heat source system through an automatic control cable 12 .

The closed cooling tower 1 of the water source VRF air-conditioning cold and heat source system, the auxiliary heat source-low temperature air-cooled heat pump unit 2, the water source VRF air-conditioning outdoor unit 4, the air-cooled heat pump side circulating water pump 6, the air-conditioning water loop circulating water pump 7, The pipeline valves 8 are all connected to the terminal processor 11 of the water source VRF air conditioning control system through the automatic control cable 12;

The water source VRF air conditioner outdoor unit 4 and the water source VRF air conditioner indoor unit 5 are connected through an automatic control cable 12 .

2.1 The connection and control methods of the control system of the air-conditioning water loop are as follows:

After the water source VRF air-conditioning indoor unit 5 is requested to start by the personnel in the air-conditioning area, it is transmitted to the water source VRF air-conditioning outdoor unit 5 through the automatic control cable 12, and the corresponding electric switch valve is opened in linkage, and the water source VRF is turned on after the water flow switch action. The air-conditioning outdoor unit 5 feeds back an opening signal to the terminal processor 11 of the water source VRF air-conditioning control system;

After the water source VRF air conditioner indoor unit 5 is sent a shutdown request by the personnel in the air conditioning area, it is transmitted to the water source VRF air conditioner outdoor unit 5 through the automatic control cable 12, and the water source VRF air conditioner outdoor unit 5 and the corresponding electric switch valve are closed in turn. Feedback the closing signal to the terminal processor 11 of the water source VRF air conditioning control system;

The terminal processor 11 determines the number of closed cooling towers 1, water-water heat exchangers 3, and air-conditioning water loop circulating water pumps 7 by accumulating the number of running units of the water source VRF air-conditioning outdoor unit 5, and adjusts the number of units in the open state. The operating frequency of the circulating water pump 7 of the air-conditioning water loop;

The terminal processor 11 realizes that the circulating water enters the closed cooling tower when the water source VRF air conditioning system is cooled by opening and closing the electric switch valve corresponding to the closed cooling tower 1 and adjusting the electric switch valve corresponding to the water-water heat exchanger 3 1. The purpose of circulating water entering the water-water heat exchanger 3 during heating;

When the water source VRF air-conditioning system is used for cooling, the circulating water enters the closed cooling tower 1 in the open state, and the opening and closing state of the fan of the closed cooling tower 1 is adjusted by monitoring the deviation between the temperature sensor at the outlet and the set value or operating frequency;

When the water source VRF air conditioning system is heating, the circulating water enters the water-water heat exchanger 3 in the open state, and the opening degree of the electric three-way regulating valve is adjusted by monitoring the deviation between the temperature sensor at the outlet and the set value.

2.2 The connection and control methods of the control system of the air-cooled heat pump side loop are as follows:

The electric switch valve on the air-cooled heat pump side loop side of the water-water heat exchanger 3 is in the same opening and closing state as the air-conditioning water loop electric switch valve of the water-water heat exchanger 3;

The flow sensor and temperature sensor of the air-cooled heat pump side loop transmit signals to the terminal processor 11, and determine the auxiliary heat source—low temperature air-cooled heat pump unit 2, air-cooled heat pump side circulating water pump by accumulating the value of the heat load of the air conditioner The number of operating units is 6; the outlet water temperature is controlled by the built-in controller of the auxiliary heat source-low temperature air-cooled heat pump unit 2.

The utility model has the following advantages:

The overall design concept of the utility model is: by integrating the advantages of the new energy-saving technology of the air conditioner, a complete set of cold and heat source system of the water source VRF air conditioner serving as the terminal of the water source VRF air conditioner unit is formed, and a supporting water source VRF air conditioner control system is set to realize the water source VRF air conditioner The cold and heat source system operates efficiently and reliably.

The utility model has the following advantages:

1. The VRF air-conditioning system is used to flexibly respond to the indoor temperature and humidity requirements of each air-conditioned area in each sub-region, and promote behavioral energy saving;

2. Utilizing the characteristics that the cooling temperature of water source VRF air conditioning system is lower than that of air source VRF air conditioning system and its energy efficiency is higher, establish the frame of water source VRF air conditioning system, and set up a closed cooling tower that dissipates heat to the outside during cooling and heat supply. The auxiliary heat source for air-conditioning water loop heating - low-temperature air-cooled heat pump unit and water-water heat exchanger, which has lower installed power and energy consumption than conventional air-source VRF air-conditioning systems;

3. Utilizing the characteristics that the heating energy efficiency of the air-cooled heat pump unit increases with the decrease of the hot water temperature, the auxiliary heat source - the low-temperature air-cooled heat pump unit has a lower temperature of the hot water supply than the conventional system, and the operation of the unit is more energy-efficient;

4. In the case that each water source VRF air-conditioning unit has separate cooling and heating, the air-conditioning water loop can neutralize the difference between cooling and heating loads, make full use of cooling/heating capacity, and reduce operating energy consumption;

5. The water source VRF air conditioning control system tailored for the water source VRF air conditioning cold and heat source system is set based on the reliability of the system operation, energy saving and high efficiency, including water pump frequency conversion, auxiliary heat source - low temperature air-cooled heat pump unit stepless adjustment, closed The built-in fan and spray pump control of the type cooling tower have the advantages of simple control, reliable operation, energy saving and high efficiency.

5. Water source VRF air conditioner outdoor unit and indoor unit can be purchased and installed in stages, reducing the initial investment pressure of the owner;

6. To meet the needs of efficient and reliable operation of the system, a highly targeted water source VRF air conditioning control system is set up.

7. The energy consumption of closed cooling towers, auxiliary heat sources - low-temperature air-cooled heat pump units, water pumps and other public equipment accounts for about 15% of the total energy consumption, and more than 85% of the electricity consumption is billed independently by users, which is conducive to promoting behavioral energy conservation .

8. This system concentrates the main high-noise or heat dissipation equipment (closed cooling tower, auxiliary heat source-low temperature air-cooled heat pump unit, water pump) on the roof or in the water pump room. Compared with the traditional air-cooled multi-connected system, it is more efficient. Energy efficient, while the building itself provides a quieter and more pleasant environment.

Description of drawings:

Figure 1 Flow chart of water source VRF air conditioning cold and heat source system;

Figure 2 Schematic diagram of water source VRF air conditioning cold and heat source system;

Figure 2a is a schematic diagram of the cooling system of the water source VRF air-conditioning cold and heat source system;

Fig. 2b The heating principle diagram of the water source VRF air-conditioning cold and heat source system;

Figure 3 Schematic diagram of water source VRF air conditioning control system;

Figure 4 is a flow chart of the water source VRF air-conditioning cold and heat source system without water separators and water collectors on the basis of Figure 1.

Label description

1 closed cooling tower, 2 auxiliary heat source - low temperature air-cooled heat pump unit, 3 water-water heat exchanger, 4 water source VRF air conditioner outdoor unit, 5 water source VRF air conditioner indoor unit, 6 air-cooled heat pump side circulating water pump, 7 air conditioner water ring Circulating water pump, 8 pipeline valves, 81 electric switch valve, 82 electric three-way regulating valve, 83 electric regulating valve, 84 water flow switch, 85 flow sensor, 86 temperature sensor, 9 water distributor, 10 water collector, 11 Terminal processor, 12 automatic control cables.

detailed description:

In order to make the structure of the utility model more clear and complete, the utility model will be further described below in conjunction with the accompanying drawings.

According to the different numbers of water source VRF air-conditioning outdoor units 4 in the air-conditioning partitions, the utility model has two different configurations.

In relatively common cases, when configuring water source VRF air conditioner outdoor units 4 with more than two air conditioner zones, the following embodiments are adopted;

Example 1

1. The process flow of water source VRF air conditioning cold and heat source system is shown in Figure 1:

The closed cooling tower 1, the air-conditioning water loop side of the water-water heat exchanger 3, the water source VRF air-conditioning outdoor unit 4, the air-conditioning water loop circulating water pump 7, the water separator 9, and the water collector 10 pass through Water pipes are connected to form an air-conditioning water loop;

Wherein, the air-conditioning circulating water prepared by the water source VRF air-conditioning system is distributed to the water source VRF air-conditioning outdoor units 4 of multiple air-conditioning partitions through the water separator 9 and the water collector 10;

The auxiliary heat source-low temperature air-cooled heat pump unit 2, the air-cooled heat pump side of the water-water heat exchanger 3, and the circulating water pump 6 on the air-cooled heat pump side are connected through water pipes to form a loop on the air-cooled heat pump side;

The air-conditioning water loop and the air-cooled heat pump side loop are provided with pipeline valves 8, and the pipeline valves 8 include an electric switch valve 81, an electric three-way regulating valve 82, an electric regulating valve 83, a water flow switch 84, and a flow sensor 85. Temperature sensor 86;

The water source VRF air conditioner outdoor unit 4 and the water source VRF air conditioner indoor unit 5 are connected through refrigerant pipes;

The closed cooling tower 1 of the water source VRF air-conditioning cold and heat source system, the auxiliary heat source-low temperature air-cooled heat pump unit 2, the water source VRF air-conditioning outdoor unit 4, the air-cooled heat pump side circulating water pump 6, the air-conditioning water loop circulating water pump 7, The pipeline valves 8 are all connected to the terminal processor 11 of the water source VRF air conditioning control system through the automatic control cable 12;

The water source VRF air conditioner outdoor unit 4 and the water source VRF air conditioner indoor unit 5 are connected through an automatic control cable 12 .

2. The principle of water source VRF air conditioning cold and heat source system is shown in Figure 2, 2a, 2b, and the specific connection method is as follows:

2.1 The specific connection mode of the air conditioning water loop

(a) The circulating water of the air-conditioning water loop is pressurized by the circulating water pump 7 of the air-conditioning water loop, connected to the water separator 9, and distributed to the water source VRF air-conditioning outdoor unit 4 of each air-conditioning partition, after the circulating water passes through the heat exchange Back to the water collector 10; the water source VRF air-conditioning outdoor unit 4 of each air-conditioning zone is equipped with a corresponding electric switch valve and water flow switch;

(b) The water return of the water collector 10 is provided with two branch pipes; one branch pipe is connected to the closed cooling tower 1, and corresponding electric on-off valves, water flow switches, and temperature sensors are set on the pipeline; the other branch pipe is connected to the water -The air-conditioning water loop side of the water heat exchanger 3, and the corresponding electric on-off valve, electric three-way regulating valve, and temperature sensor are set on the pipeline; the circulation processed by the closed cooling tower 1 or the water-water heat exchanger 3 The water is connected to the air-conditioning water loop circulating water pump 7 through a water pipe;

(c) A temperature sensor is arranged before the water separator 9; a flow sensor and a temperature sensor are arranged behind the water collector 10; an electric regulating valve is arranged between the water separator 9 and the water collector 10;

(d) The air-conditioning water loop circulating water pump 7 belongs to the circulating power of the water system, and the specific setting position can be changed according to the actual situation;

2.2 The specific connection mode of the air-cooled heat pump side loop

The circulating water of the air-cooled heat pump side loop is pressurized by the air-cooled heat pump side circulating water pump 6, and then connected to the auxiliary heat source-low temperature air-cooled heat pump unit 2, the air-cooled heat pump side of the water-water heat exchanger 3, and then connected to The circulating water pump 6 on the side of the air-cooled heat pump forms a loop on the side of the air-cooled heat pump; the auxiliary heat source-low temperature air-cooled heat pump unit 2 is equipped with a corresponding electric switch valve, water flow switch, and temperature sensor; the air-cooled heat pump of the water-water heat exchanger 3 An electric switch valve is installed on the side loop side; a temperature sensor and a flow sensor are installed on the water supply main pipe and the return water main pipe;

The air-cooled heat pump side circulating water pump 6 belongs to the circulating power of the water system, and the specific setting position can be changed according to the actual situation;

3. The principle of water source VRF air conditioning control system is shown in Figure 3. All equipment and pipeline valves are connected to the terminal processor through automatic control cables. The specific control is as follows:

3.1 Control system of air conditioning water loop

After the water source VRF air-conditioning indoor unit 5 is requested to start by the personnel in the air-conditioning area, it is transmitted to the water source VRF air-conditioning outdoor unit 5 through the automatic control cable 12, and the corresponding electric switch valve is opened in linkage, and the water source VRF is turned on after the water flow switch action. The air-conditioning outdoor unit 5 feeds back an opening signal to the terminal processor 11 of the water source VRF air-conditioning control system;

After the water source VRF air conditioner indoor unit 5 is sent a shutdown request by the personnel in the air conditioning area, it is transmitted to the water source VRF air conditioner outdoor unit 5 through the automatic control cable 12, and the water source VRF air conditioner outdoor unit 5 and the corresponding electric switch valve are closed in turn. Feedback the closing signal to the terminal processor 11 of the water source VRF air conditioning control system;

The terminal processor 11 determines the number of closed cooling towers 1, water-water heat exchangers 3, and air-conditioning water loop circulating water pumps 7 by accumulating the number of running units of the water source VRF air-conditioning outdoor unit 5, and adjusts the number of units in the open state. The operating frequency of the circulating water pump 7 of the air-conditioning water loop;

The terminal processor 11 realizes that the circulating water enters the closed cooling tower when the water source VRF air conditioning system is cooled by opening and closing the electric switch valve corresponding to the closed cooling tower 1 and adjusting the electric switch valve corresponding to the water-water heat exchanger 3 1. The purpose of circulating water entering the water-water heat exchanger 3 during heating;

When the water source VRF air-conditioning system is used for cooling, the circulating water enters the closed cooling tower 1 in the open state, and the fan and spray pump of the closed cooling tower 1 are adjusted by monitoring the deviation between the temperature sensor at the outlet and the set value. The opening and closing status or operating frequency;

When the water source VRF air-conditioning system is heating, the circulating water enters the water-water heat exchanger 3 in the open state, and the opening degree of the electric three-way regulating valve is adjusted by monitoring the deviation between the temperature sensor at the outlet and the set value;

3.2 Control system of air-cooled heat pump side loop

The electric switch valve on the air-cooled heat pump side loop side of the water-water heat exchanger 3 is in the same opening and closing state as the air-conditioning water loop electric switch valve of the water-water heat exchanger 3;

The flow sensor and temperature sensor of the air-cooled heat pump side loop transmit signals to the terminal processor 11, and determine the auxiliary heat source—low temperature air-cooled heat pump unit 2, air-cooled heat pump side circulating water pump by accumulating the value of the heat load of the air conditioner The number of operating units is 6; the outlet water temperature is controlled by the built-in controller of the auxiliary heat source-low temperature air-cooled heat pump unit 2.

Special case:

Example 2

When there is only one water source VRF air conditioner outdoor unit 4 of the air conditioner zone,

The water separator 9 and the water collector 10 in Embodiment 1 can be considered omitted; as shown in Figure 4:

That is, the water source VRF air-conditioning cold and heat source system includes a closed cooling tower 1, an auxiliary heat source-low temperature air-cooled heat pump unit 2, a water-water heat exchanger 3, a water source VRF air conditioner outdoor unit 4, a water source VRF air conditioner indoor unit 5, Air-cooled heat pump side circulating water pump 6, air-conditioning water loop circulating water pump 7, pipeline valve parts 8;

The water source VRF air-conditioning cold and heat source system is divided into an air-conditioning water loop and an air-cooled heat pump side loop;

Wherein, the closed cooling tower 1, the air-conditioning water loop side of the water-water heat exchanger 3, the water source VRF air-conditioning outdoor unit 4, and the air-conditioning water loop circulating water pump 7 are connected by water pipes to form an air-conditioning water loop ;

The auxiliary heat source-low temperature air-cooled heat pump unit 2, the air-cooled heat pump side of the water-water heat exchanger 3, and the circulating water pump 6 on the air-cooled heat pump side are connected through water pipes to form a loop on the air-cooled heat pump side;

The air-conditioning water loop and the air-cooled heat pump side loop are provided with pipeline valves 8, and the pipeline valves 8 include electric on-off valves, electric three-way regulating valves, electric regulating valves, water flow switches, flow sensors, and temperature sensors;

The water source VRF air conditioner outdoor unit 4 and the water source VRF air conditioner indoor unit 5 are connected through refrigerant pipes.

The specific connection method of the air conditioning water loop of the water source VRF air conditioning cold and heat source system is as follows:

(a) The circulating water of the air-conditioning water loop is pressurized by the circulating water pump 7 of the air-conditioning water loop, connected to the water source VRF air-conditioning outdoor unit 4, and the circulating water returns to the circulating water pump 7 after heat exchange; VRF air conditioner outdoor units 4 are equipped with corresponding electric switch valves and water flow switches;

(b) The pipelines connected to the water source VRF air conditioner outdoor unit 4 are the circulating water return main pipe and the circulating water supply main pipe respectively. Two branch pipes are arranged on the circulating water return main pipe and the circulating water supply main pipe: Cooling tower 1, and corresponding electric on-off valves, water flow switches, and temperature sensors are set on the pipeline; another branch pipe is connected to the air-conditioning water loop side of water-water heat exchanger 3, and corresponding electric on-off valves, Electric three-way regulating valve, temperature sensor; the circulating water treated by the closed cooling tower 1 or the water-water heat exchanger 3 is connected to the water source VRF air conditioner outdoor unit 4 through the main water supply pipe connected to the water source VRF air conditioner outdoor unit 4, and An air-conditioning water loop circulating water pump 7 is provided on the main water supply pipe;

(c) A temperature sensor is installed on the circulating water supply main pipe; a flow sensor and a temperature sensor are installed on the circulating water return main pipe; an electric regulating valve is installed between the circulating water supply main pipe and the return water main pipe.

(d) The air-conditioning water loop circulating water pump 7 belongs to the circulating power of the water system, and the specific setting position can be changed according to the actual situation.

The connection relationship and working principle of the air-cooled heat pump side loop, and the connection relationship and working principle of the water source VRF air conditioning control system are basically the same.

Key points for setting water source VRF air conditioning cold and heat source system

1. The operating parameters of the water source VRF air conditioning cold and heat source system

The operating parameters of the water source VRF air conditioning cold and heat source system can be flexibly adjusted according to the climatic conditions of the implementation area. Take the internal test of the Fuzhou Smart Port City Science and Technology Complex Project as an example. The project is located in the northern district of the hot summer and warm winter area. In summer, the calculated outdoor air-conditioning temperature is 28°C, and in winter, the air-conditioning outdoor calculated dry-bulb temperature is 4.4°C;

Considering that the water supply temperature of the air-conditioning water loop is about 3-4°C higher than the air-conditioning outdoor calculated ball loss temperature in summer, the supply and return water temperatures of the air-conditioning water loop for cooling are 32-37°C;

When the air-conditioning water loop is heating, the temperature of the supply and return water is 21.5-20°C; the side supply and return water temperature of the air-cooled heat pump is 26-21°C.

2. The switching of cooling and heating working conditions of the water source VRF air conditioning cold and heat source system is to control the opening and closing of the closed cooling tower and its corresponding electric switch valve, water-water heat exchange through the water source VRF air conditioning control system The opening and closing of the electric three-way valve corresponding to the device is realized.

3. The operation control strategy of the water source VRF air-conditioning cold and heat source system is as follows:

3.1 Control objects: various auxiliary heat sources - low temperature air-cooled heat pump unit, closed cooling tower, water source VRF air conditioner outdoor unit, water source VRF air conditioner indoor unit; air-cooled heat pump side circulating water pump, air conditioning water loop circulating water pump; pipeline valves Electric switch valve, electric regulating valve, electric three-way regulating valve.

3.2 Test content: supply and return water temperature and flow rate of air-conditioning water loop; supply and return water temperature and flow rate of air-cooled heat pump side loop; water flow switch opening and closing status; closed cooling tower, auxiliary heat source-low temperature air-cooled heat pump Normal operation, failure and remote/local conversion status of unit, water source heat pump variable refrigerant air conditioner host, air-cooled heat pump side circulating water pump, air conditioning water loop circulating water pump; working frequency monitoring of air conditioning water loop circulating water pump. The above should be able to display on DDC.

3.3 Interlock control and protection

1) According to the scheduled work schedule, the DDC of the outdoor unit and indoor unit of the water source VRF air conditioner starts and stops on time.

Start when cooling:

Indoor unit application → outdoor unit start application → corresponding electric valve open → water flow switch → outdoor unit open;

Start-up application of outdoor unit → circulating water pump of air-conditioning water loop → closed cooling tower.

Stop when cooling:

Indoor mechanism→outdoor mechanism→air conditioning water loop circulating water pump→closed cooling tower;

The outdoor unit is closed → the corresponding electric valve is closed.

On heating:

Indoor unit application → outdoor unit start application → corresponding electric valve open → water flow switch → outdoor unit open;

Application for starting up of outdoor unit → air conditioning water loop circulating water pump → air-cooled heat pump side circulating water pump → auxiliary heat source - low-temperature air-cooled heat pump unit;

Stop while heating:

Indoor unit off → outdoor unit → auxiliary heat source - low temperature air-cooled heat pump unit → air-cooled heat pump side circulating water pump → air-conditioning water loop circulating water pump;

The outdoor unit is closed → the corresponding electric valve is closed.

2) Through the DDC accumulation of the running time of each device, the balanced operation of the same group of devices is realized. When one of the devices fails, the backup device will automatically be put into operation, and at the same time, it will prompt for maintenance.

3) The start-stop control time of the DDC for the air-conditioning water loop circulating water pump and the air-cooled heat pump side circulating water pump should be consistent with the requirements of the closed cooling tower/auxiliary heat source-low temperature air-cooled heat pump unit.

4) Each water source VRF air conditioner outdoor unit is linked with the electric switch valve and water flow switch of the corresponding pipeline. After receiving the start-up application, open the electric switch valve on the corresponding pipeline, and start the machine after the water flow switch is activated.

5) After the water pump is started, the water flow switch detects the water flow state, and if a water failure occurs, each water source heat pump becomes a refrigerant air conditioner host and the air-cooled heat pump automatically stops.

3.4 Alarm: temperature over limit alarm, water pump failure alarm, water pressure difference over limit alarm, host failure alarm.

3.5 Display and print: parameters, status, alarm, dynamic flow chart (set value, measured value, status)

3.6 System operating conditions and process control

1) Control the opening and closing of the electric on-off valve of the closed cooling tower pipeline and the electric on-off valve of the water-water heat exchanger pipeline to realize the switching of cooling/heating working conditions;

2) Increase or decrease of the circulating water pump of the air-conditioning water loop and frequency conversion adjustment:

By detecting the running number of water source VRF air conditioner outdoor units, adjust the running number of the air conditioning water loop circulating water pump. That is, n water source VRF air conditioner outdoor units correspond to 1 air conditioner water loop circulating water pump.

By detecting the temperature of the supply and return water, the frequency of the water pump is adjusted according to the deviation between the temperature difference of the supply and return water and the set value. When the pump frequency reaches the lower limit of 40Hz, no frequency conversion will be performed, and it will run at 40Hz. By adjusting the opening of the electric regulating valve between the water separator and the water collector, the pressure difference is kept constant.

3) When cooling, the number of operating units of the closed cooling tower should be determined corresponding to the operating number of circulating water pumps in the air-conditioning water loop. That is, the rated flow rate of the air-conditioning water loop circulating water pump in the open state is equivalent to the rated flow rate of the closed cooling tower. Closed cooling tower with intelligent control box. According to the deviation between the outlet water temperature and the set value, the fan and spray pump of the closed cooling tower are controlled to start and stop.

4) When heating, the air-cooled heat pump side loop maintains a constant temperature of the water supply through the stepless adjustment of the air-cooled heat pump. The air-cooled heat pump is equipped with an intelligent control box, which can automatically adjust the heat supply of the unit and the number of operating units according to the change of the water supply temperature during heating. The air-conditioning water loop adjusts the proportion of water entering the water-water heat exchanger according to the deviation between the temperature of the mixed water behind the electric three-way regulating valve behind the water-water heat exchanger and the set value.

5) Set the time delay and the upper and lower limits of cooling capacity control to prevent frequent start and stop of the unit. Specific applications of the following water source VRF air conditioning cold and heat source systems:

The application is located in a certain place in Fuzhou City, with a total construction area of 48,806m ² , one basement floor, 18 floors above ground for the main building, 3 floors for the podium, and a building height of 83.05m. The building function of the main building is mainly for rental and sales, and office for self-use, and the skirt building is for commercial supporting buildings, etc. The total area of shops is about 4,750m ² , and the area of offices, meeting rooms and auxiliary rooms is about 3,4848m ² .

Air conditioner calculation parameters are selected according to Fuzhou area. Among them, the calculated outdoor dry bulb temperature of the air conditioner in summer is 35.9°C, and the wet bulb temperature is 28.0°C; the calculated temperature of the air conditioner in winter is 4.4°C, and the relative humidity is 74%. The cooling load of the air conditioner in summer is 5333kW, and the heat load of the air conditioner in winter is 1478kW.

The air conditioning system adopts regional water source VRF air conditioning cold and heat source system. Realize independent billing by area, and at the same time, the water source VRF air-conditioning outdoor units in each area are connected in parallel by the public water loop; closed cooling towers are used for heat dissipation and cooling in summer. The auxiliary heat source in winter adopts a low-temperature hot water air-cooled heat pump unit, which heats and circulates hot water through a plate water-water heat exchanger. Closed cooling tower, auxiliary heat source - low-temperature air-cooled heat pump unit, and plate water-water heat exchanger are centrally arranged on the large roof. The circulating water pump of the air-conditioning water loop is arranged in the air-conditioning circulating water pump room in the basement. Public loop equipment (including closed cooling towers, auxiliary heat sources - low-temperature air-cooled heat pumps, and water pumps) adopts a shared billing method, and the operating costs are apportioned according to the weight of functional operating hours. There are 2 sets of circulating water pumps for the air-conditioning water loop, respectively responding to the flow demands of winter and summer working days during the day, winter and summer weekends and nights.

The air-conditioning system is connected to the BAS system of the building automation system, and the control system adopts the above-mentioned water source VRF air-conditioning control system.

The configuration of the project is as follows:

(1) Closed cooling tower:

The rated water volume of a single unit is 150m3/h, and there are 9 units in total;

(2) Auxiliary heat source - low temperature air-cooled heat pump unit:

The capacity of a single unit is 754kw, and the temperature of supply and return water is 26-21°C, a total of 2 units;

(3) Water-water heat exchanger:

A plate water-water heat exchanger is adopted, with a rated heat transfer capacity of 1630kw, a total of 1 set;

(4) Water source VRF air conditioner outdoor units: 180 sets;

(5) Water source VRF air conditioner indoor unit: corresponds to the water source VRF air conditioner outdoor unit;

(6) Air-cooled heat pump side circulating water pump:

The flow rate of a single unit is 280m3/h, and the head is 14.5m. There are 2 units in total, one for use and one for standby;

(7) Air-conditioning water loop circulating water pump:

Daytime operation on working days in winter and summer: the flow rate of a single unit is 450m3/h, the head is 25m, a total of 4 units, 3 for use and 1 for standby;

Weekend and night operation in winter and summer: single unit flow rate 280m3/h, head 22m, 4 units in total, 1 for use and 1 for standby;

(8) Pipeline valve parts: set up with the above equipment;

(9) water separator, (10) water collector: not set;

(11) Terminal processor: connected to the BAS system of the building automation system;

(12) Automatic control cable: set up with the above-mentioned equipment and cables.

Technical and economic indicators of the project

The total cooling load of this project in summer is about 5333kW, and the heating load is about 1478kW. The converted cooling load per unit building area is 109W/m ² , and the heating load per unit building area is 30W/m ² . The total power consumption under the cooling design condition is N=1353.1kW, and the converted power consumption per unit building area is 27.7W/m ² .

Under refrigeration design conditions, the power consumption of public equipment (including cooling towers and water pumps) is 203.1kW, accounting for about 15% of the total power consumption.

The project system fully considers the building function needs and load changes, and sets up 4 operating modes. The corresponding overall system EER values in the four working modes are as follows:

Claims (9)

1. a water source VRF air conditioner cold-heat origin system, is characterized in that: it comprises water source VRF air conditioner cold-heat origin system and supporting water source VRF air-conditioner control system;

Described water source VRF air conditioner cold-heat origin system comprises closed cooling tower (1), auxiliary thermal source-low-temperature air-cooling heat pump unit (2), water-water heat exchanger (3), water source VRF air-conditioner outdoor unit (4), water source VRF indoor apparatus of air conditioner (5), air-cooled heat pump side water circulating pump (6), air conditioner water looped cycle water pump (7), pipeline valve member (8);

The water source VRF air-conditioner control system that described water source VRF air conditioner cold-heat source Operation system setting is supporting, comprises terminal handler (11), automatically controls cable (12); Terminal handler (11) is connected with water source VRF air conditioner cold-heat origin system by automatically controlling cable (12).

2. water source according to claim 1 VRF air conditioner cold-heat origin system, it is characterized in that: when configuring water source VRF air-conditioner outdoor unit (4) of two or more air conditioning zoning, water source VRF air conditioner cold-heat origin system also comprises water knockout drum (9), water collector (10).

3. water source according to claim 1 VRF air conditioner cold-heat origin system, is characterized in that:

Described water source VRF air conditioner cold-heat origin system is divided into air conditioner water loop and air-cooled heat pump side ring road;

Wherein, connected by water pipe between described closed cooling tower (1), the air conditioner water loop side of water-water heat exchanger (3), water source VRF air-conditioner outdoor unit (4), air conditioner water looped cycle water pump (7), form air conditioner water loop;

Connected by water pipe between the air-cooled heat pump side of described auxiliary thermal source-low-temperature air-cooling heat pump unit (2), water-water heat exchanger (3), air-cooled heat pump side water circulating pump (6), form air-cooled heat pump side ring road;

Described air conditioner water loop and air-cooled heat pump side ring road arrange pipeline valve member (8), and pipeline valve member (8) comprises electric switching valve (81), electric three-way regulating valves (82), electric control valve (83), water flow switch (84), flow sensor (85), temperature sensor (86);

Connected by refrigerant pipe between described water source VRF air-conditioner outdoor unit (4), water source VRF indoor apparatus of air conditioner (5);

The closed cooling tower (1) of described water source VRF air conditioner cold-heat origin system, auxiliary thermal source-low-temperature air-cooling heat pump unit (2), water source VRF air-conditioner outdoor unit (4), air-cooled heat pump side water circulating pump (6), air conditioner water looped cycle water pump (7), pipe valve (8) are all by automatically controlling the terminal handler (11) of cable (12) access water source VRF air-conditioner control system;

Connect by automatically controlling cable (12) between described water source VRF air-conditioner outdoor unit (4), water source VRF indoor apparatus of air conditioner (5).

4. water source according to claim 2 VRF air conditioner cold-heat origin system, is characterized in that:

Described water source VRF air conditioner cold-heat origin system is divided into air conditioner water loop and air-cooled heat pump side ring road;

Described closed cooling tower (1), the air conditioner water loop side of water-water heat exchanger (3), water source VRF air-conditioner outdoor unit (4), air conditioner water looped cycle water pump (7), water knockout drum (9), water collector are connected by water pipe between (10), form air conditioner water loop;

Wherein, air-conditioner circulating water prepared by described water source VRF air-conditioning system is dispensed to water source VRF air-conditioner outdoor unit (4) of multiple air conditioning zoning by water knockout drum (9), water collector (10);

Connected by water pipe between the air-cooled heat pump side of described auxiliary thermal source-low-temperature air-cooling heat pump unit (2), water-water heat exchanger (3), air-cooled heat pump side water circulating pump (6), form air-cooled heat pump side ring road;

Described air conditioner water loop and air-cooled heat pump side ring road arrange pipeline valve member (8), and pipeline valve member (8) comprises electric switching valve (81), electric three-way regulating valves (82), electric control valve (83), water flow switch (84), flow sensor (85), temperature sensor (86);

Connected by refrigerant pipe between described water source VRF air-conditioner outdoor unit (4), water source VRF indoor apparatus of air conditioner (5);

The closed cooling tower (1) of described water source VRF air conditioner cold-heat origin system, auxiliary thermal source-low-temperature air-cooling heat pump unit (2), water source VRF air-conditioner outdoor unit (4), air-cooled heat pump side water circulating pump (6), air conditioner water looped cycle water pump (7), pipe valve (8) are all by automatically controlling the terminal handler (11) of cable (12) access water source VRF air-conditioner control system;

Connect by automatically controlling cable (12) between described water source VRF air-conditioner outdoor unit (4), water source VRF indoor apparatus of air conditioner (5).

5. water source according to claim 3 VRF air conditioner cold-heat origin system, is characterized in that: the concrete connected mode of air conditioner water loop of water source VRF air conditioner cold-heat origin system is as follows:

A the recirculated water of the air conditioner water loop described in () is through air conditioner water looped cycle water pump (7) pressurization, be connected to water source VRF air-conditioner outdoor unit (4), recirculated water gets back to water circulating pump (7) after heat exchange; Water source VRF air-conditioner outdoor unit (4) of each air conditioning zoning all arranges corresponding electric switching valve, water flow switch;

B pipeline that () is connected with water source VRF air-conditioner outdoor unit (4) is respectively recirculated water backwater main and recirculated water water main, recirculated water backwater main establishes two-way arm with on recirculated water water main: a road arm is connected closed cooling tower (1), and on pipeline, arrange corresponding electric switching valve, water flow switch, temperature sensor; Another road arm connects the air conditioner water loop side of water-water heat exchanger (3), and on pipeline, arrange corresponding electric switching valve, electric three-way regulating valves, temperature sensor; The recirculated water processed through closed cooling tower (1) or water-water heat exchanger (3) is connected to water source VRF air-conditioner outdoor unit (4) by the water main be connected with water source VRF air-conditioner outdoor unit (4), and on water main, be provided with air conditioner water looped cycle water pump (7);

Set temperature sensor on (c) recirculated water water main; Recirculated water backwater main arranges flow sensor, temperature sensor; Between recirculated water water main and backwater main, electric control valve is set.

6. water source according to claim 4 VRF air conditioner cold-heat origin system, is characterized in that: the concrete connected mode of air conditioner water loop of water source VRF air conditioner cold-heat origin system is as follows:

A the recirculated water of the air conditioner water loop described in () pressurizes through air conditioner water looped cycle water pump (7), be connected to water knockout drum (9), be dispensed to water source VRF air-conditioner outdoor unit (4) of each air conditioning zoning, recirculated water gets back to water collector (10) after heat exchange; Water source VRF air-conditioner outdoor unit (4) of each air conditioning zoning all arranges corresponding electric switching valve, water flow switch;

B the backwater of the water collector (10) described in () establishes two-way arm; One road arm connects closed cooling tower (1), and on pipeline, arrange corresponding electric switching valve, water flow switch, temperature sensor; Another road arm connects the air conditioner water loop side of water-water heat exchanger (3), and on pipeline, arrange corresponding electric switching valve, electric three-way regulating valves, temperature sensor; The recirculated water processed through closed cooling tower (1) or water-water heat exchanger (3) is connected to air conditioner water looped cycle water pump (7) by water pipe;

The front set temperature sensor of (c) water knockout drum (9); Water collector arranges flow sensor, temperature sensor after (10); Between water knockout drum (9) and water collector (10), electric control valve is set.

7. the water source VRF air conditioner cold-heat origin system according to claim 3 or 4, is characterized in that: the concrete connected mode in air-cooled heat pump side ring road of water source VRF air conditioner cold-heat origin system is as follows:

A the recirculated water on the air-cooled heat pump side ring road described in () pressurizes through air-cooled heat pump side water circulating pump (6), connect the air-cooled heat pump side of auxiliary thermal source-low-temperature air-cooling heat pump unit (2), water-water heat exchanger (3) successively, access air-cooled heat pump side water circulating pump (6) again, form air-cooled heat pump side ring road; Auxiliary thermal source-low-temperature air-cooling heat pump unit (2) arranges corresponding electric switching valve, water flow switch, temperature sensor; The air-cooled heat pump side ring trackside of water-water heat exchanger (3) arranges electric switching valve; Set temperature sensor, flow sensor on water main, backwater main.

8. the water source VRF air conditioner cold-heat origin system according to claim 3 or 4, is characterized in that:

In the control system of air conditioner water loop:

After described water source VRF indoor apparatus of air conditioner (5) sends start requirement by the personnel of air conditioning area, water source VRF air-conditioner outdoor unit (5) is sent to by automatically controlling cable (12), corresponding electric switching valve is opened in interlock, after water flow switch action, open water source VRF air-conditioner outdoor unit (5), and feed back start signal to the terminal handler (11) of water source VRF air-conditioner control system;

After described water source VRF indoor apparatus of air conditioner (5) sends shutdown requirement by the personnel of air conditioning area, water source VRF air-conditioner outdoor unit (5) is sent to by automatically controlling cable (12), close water source VRF air-conditioner outdoor unit (5), corresponding electric switching valve successively, and feed back shutdown signal to the terminal handler (11) of water source VRF air-conditioner control system;

Described terminal handler (11) is by the operation number of units at integrating water source VRF air-conditioner outdoor unit (5), determine the operation number of units of closed cooling tower (1), water-water heat exchanger (3), air conditioner water looped cycle water pump (7), the running frequency of the air conditioner water looped cycle water pump (7) of adjustment opening;

Described terminal handler (11) is by opening and closing electric switching valve corresponding to closed cooling tower (1), regulating the electric switching valve that water-water heat exchanger (3) is corresponding, and when when realizing water source VRF air-conditioning system cooling, recirculated water enters closed cooling tower (1), heat supply, recirculated water enters the object of water-water heat exchanger (3);

During described water source VRF air-conditioning system cooling, recirculated water enters the closed cooling tower (1) under opening, by monitoring the deviation of its temperature sensor exported and setting value, the open/close states of the blower fan of adjustment closed cooling tower (1) or running frequency;

During described water source VRF air-conditioning system heat supply, recirculated water enters the water-water heat exchanger (3) under opening, by the deviation of the temperature sensor with setting value of monitoring its outlet, adjusts the aperture of electric three-way regulating valves.

9. the water source VRF air conditioner cold-heat origin system according to claim 3 or 4, is characterized in that:

In the control system on air-cooled heat pump side ring road:

The electric switching valve of the air-cooled heat pump side ring trackside of described water-water heat exchanger (3) is consistent with the air conditioner water loop electric switching valve open/close states of water-water heat exchanger (3);

Flow sensor, the temperature sensor on described air-cooled heat pump side ring road transmit signals to terminal handler (11), by the numerical value of integrating air conditioner heat load, determine the operation number of units of auxiliary thermal source-low-temperature air-cooling heat pump unit (2), air-cooled heat pump side water circulating pump (6); The controller built-in by auxiliary thermal source-low-temperature air-cooling heat pump unit (2) controls leaving water temperature.