Air source heat pump and water-cooled chiller combined cooling and heating system

Abstract

This utility model discloses a combined cooling and heating system of an air source heat pump and a water-cooled chiller unit, including an air source heat pump unit, a water-cooled chiller unit, and a piping unit. The air source heat pump unit includes an air source heat pump unit with a heat pump supply pipe and a heat pump return pipe. The water-cooled chiller unit includes a chiller unit and a cooling tower. The chiller unit's evaporator is equipped with a chilled water supply pipe and a chilled water return pipe. A cooling water supply pipe and a cooling water return pipe are connected between the chiller unit's condenser and the cooling tower. The piping unit includes a supply riser and a return riser for connecting the air source heat pump unit and the water-cooled chiller unit. The supply riser is connected to the heat pump supply main pipe and the chilled water supply main pipe, and the return riser is connected to the heat pump return main pipe and the chilled water return main pipe. Each riser is equipped with a switching valve. The supply risers and return risers in the same group are connected to user equipment located on each floor of the building through pipes. This utility model equipment has low investment, low operating costs, and is easy to adjust.

Description

Technical Field

[0001] This utility model relates to the field of energy-saving technology for centralized air conditioning in buildings, and in particular to a combined cooling and heating system of an air source heat pump and a water-cooled chiller. Background Technology

[0002] Centralized air conditioning systems in shopping malls, office buildings, and apartments allow for unified control, providing centralized cooling and heating, and improving environmental comfort. However, the initial investment and ongoing operating costs of centralized air conditioning are high, requiring careful consideration. For centralized air conditioning systems with large cooling loads and small heating loads, a combination of water-cooled chillers and boiler / municipal heat source heating is typically used. While the aforementioned water-cooled chillers have high cooling efficiency, the initial investment and operating costs of the boilers or municipal heat sources used in conjunction with them are high. Furthermore, boiler heating also suffers from high energy consumption. Therefore, overall, the above solutions are not the optimal choice. Air source heat pump units are energy-saving and environmentally friendly air conditioning equipment that can efficiently provide both heating and cooling. However, if used alone, the following issues exist: when the outdoor dry-bulb temperature is high, the cooling efficiency of air source heat pump units is low; air source heat pump units only have a certain advantage in cooling when the outdoor dry-bulb temperature is low at the beginning, end, or transitional seasons of the cooling season. Summary of the Invention

[0003] To address the aforementioned problems, this utility model provides a convenient, energy-saving, and environmentally friendly combined cooling and heating system using an air-source heat pump and a water-cooled chiller. Specifically, the following technical solution can be adopted:

[0004] The air-source heat pump and water-cooled chiller combined cooling and heating system of this utility model includes an air-source heat pump unit, a water-cooled chiller unit, and a piping unit.

[0005] The air source heat pump unit includes an air source heat pump unit, which is equipped with a heat pump water supply pipe and a heat pump water return pipe. A first circulating water pump is installed on the heat pump water supply pipe, and a first return water processor is installed on the heat pump water return pipe.

[0006] The water-cooled chiller unit includes a chiller unit and a cooling tower. The evaporator of the chiller unit is equipped with a chilled water supply pipe and a chilled water return pipe. A second circulating water pump is installed on the chilled water supply pipe, and a second return water processor is installed on the chilled water return pipe. A cooling water supply pipe and a cooling water return pipe are installed between the condenser of the chiller unit and the cooling tower. A third circulating water pump is installed on the chilled water supply pipe.

[0007] The piping unit includes a heat pump supply main pipe and a heat pump return main pipe installed at the top of the building, a cold water supply main pipe and a cold water return main pipe installed at the bottom of the building, and supply risers and return risers extending from the top of the building to the bottom. The heat pump supply main pipe is connected to the heat pump supply pipe, the heat pump return main pipe is connected to the heat pump return pipe, the cold water supply main pipe is connected to the cold water supply pipe, and the cold water return main pipe is connected to the cold water return pipe. The end of the supply riser is connected to the heat pump supply main pipe and the cold water supply main pipe, and the end of the return riser is connected to the heat pump return main pipe and the cold water return main pipe. Each supply riser and return riser is equipped with a switching valve. Each supply riser and one return riser are configured as a group. The supply risers and return risers in the same group are connected to user equipment installed on each floor of the building through pipes.

[0008] Control valves are installed on the heat pump water supply pipe, heat pump water return pipe, cold water supply pipe, cold water return pipe, cooling water supply pipe, and cooling water return pipe.

[0009] The heat pump water supply pipe is connected in parallel to the heat pump water supply main pipe through heat pump water supply branch pipes. The first circulating water pump is installed on the heat pump water supply branch pipe and the pipeline is switched through the first manual switching valve. There are m units of the air source heat pump unit. When m≤3, there are m+1 units of the first circulating water pump and m+1 heat pump water supply branch pipes. When m≥4, there are m units of the first circulating water pump and m heat pump water supply branch pipes.

[0010] The chiller unit and cooling tower are each equipped with n units; the chilled water supply pipe is connected in parallel to the chilled water supply main pipe through chilled water supply branch pipes; the second circulating water pump is installed on the chilled water supply branch pipe and the pipeline is switched through a second manual switching valve; the cooling water supply pipe is equipped with parallel cooling water supply branch pipes, and the third circulating water pump is installed on the cooling water supply branch pipe and the pipeline is switched through a third manual switching valve; when n≤3, the second and third circulating water pumps are each equipped with n+1 units, and the chilled water supply branch pipes and cooling water supply branch pipes are each equipped with n+1 lines; when n≥4, the second and third circulating water pumps are each equipped with n units, and the chilled water supply branch pipes and cooling water supply branch pipes are each equipped with n lines.

[0011] The water supply riser and return riser are connected in parallel in two or more sets. The water supply riser and return riser in the same set have the same pipe diameter. Each water supply riser and return riser is designed with a pipe diameter according to the maximum cooling load it bears.

[0012] The user equipment includes fan coil units and fresh air handling units.

[0013] All the switching valves are installed on the same floor of the building, and are 1.2m above the ground of the floor.

[0014] This utility model provides a combined cooling and heating system using an air-source heat pump and a water-cooled chiller. The air-source heat pump unit and the water-cooled chiller unit are connected via vertical pipes installed along the building. The air-source heat pump unit can provide heating, and during cooling, the state of the switching valve on the vertical pipe can be switched according to the outdoor temperature, allowing for multiple modes such as individual operation of the air-source heat pump unit and the water-cooled chiller unit, or combined operation of both. This fully utilizes the advantages of both units, achieving the goal of reducing system energy consumption and operating costs. Furthermore, the vertical pipes are designed with equal diameters according to the maximum cooling load, thereby reducing the resistance of the air conditioning water system, ensuring hydraulic balance, and further reducing overall energy consumption. This utility model features low investment, low operating costs, convenient adjustment, and easy maintenance, making it a worthy energy-saving and environmentally friendly new technology to promote. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of this utility model. Detailed Implementation

[0016] The embodiments of this utility model will be described in detail below with reference to the accompanying drawings. These embodiments are implemented based on the technical solution of this utility model and provide detailed implementation methods and specific working processes. However, the protection scope of this utility model is not limited to the following embodiments.

[0017] like Figure 1 As shown, the air source heat pump and water-cooled chiller combined cooling and heating system of this utility model includes an air source heat pump unit A, a water-cooled chiller unit B, and a piping unit C.

[0018] The air source heat pump unit A includes an air source heat pump unit A1, which is equipped with a heat pump supply pipe A2 and a heat pump return pipe A3. A first circulating water pump A4 is installed on the heat pump supply pipe A2, and a first return water processor A5 is installed on the heat pump return pipe A3. One or more air source heat pump units A1 can be installed depending on the system load. The heat pump supply pipe A2 is connected in parallel to the heat pump supply main pipe C1 via a heat pump supply branch pipe A6. The first circulating water pump A4 is installed on the heat pump supply branch pipe A6 and the pipeline is switched via multiple first manual switching valves A7. Specifically, the air source heat pump unit A1 is equipped with m (m=1,2,3,...) units. When m≤3, the first circulating water pump A4 is equipped with m+1 units, and the heat pump water supply branch pipe A6 is equipped with m+1 lines. When m≥4, the first circulating water pump A4 is equipped with m units, and the heat pump water supply branch pipe A6 is equipped with m lines. In addition, each heat pump water supply pipe A2 and heat pump water return pipe A3 is equipped with a control valve A8. In this embodiment, the air source heat pump unit A1 is equipped with two units, and the first circulating water pump A4 is equipped with three units. The first circulating water pump A4 is installed on the three heat pump water supply branch pipes A6 respectively. The two heat pump water supply pipes A2 leading out from the air source heat pump unit A1 are connected to the heat pump water supply main pipe C1 through a parallel pipeline including the aforementioned heat pump water supply branch pipes A6. Under normal circumstances, both first circulating water pumps A4 are working, with the other one serving as a standby unit, so that the air source heat pump unit A1 can still operate normally when the first circulating water pump A4 is undergoing routine maintenance.

[0019] Water-cooled chiller unit B includes chiller unit B1 and cooling tower B2. The evaporator of chiller unit B1 is equipped with a chilled water supply pipe B3 and a chilled water return pipe B4. A second circulating water pump B5 is installed on the chilled water supply pipe B3, and a second return water processor B6 is installed on the chilled water return pipe B4. The condenser of chiller unit B1 and cooling tower B2 are connected via a cooling water supply pipe B7 and a cooling water return pipe B8. A third circulating water pump B9 is installed on the chilled water supply pipe B7. Depending on the system load, n (n=1,2,3,…) chiller units B1 are installed, and the number of cooling towers B2 is equal to the number of units installed. n chilled water supply pipes B3 extending from the evaporator of chiller unit B1 are connected to the main chilled water supply pipe C3 via a parallel pipeline containing multiple chilled water supply branch pipes B10 (each equipped with a second circulating water pump B5). The switching of the operating state of the aforementioned chilled water supply branch pipes B10 is achieved by opening and closing multiple second manual switching valves B11. N cooling water supply pipes B7 extending from the condenser of chiller unit B1 are connected to parallel cooling water supply branch pipes B12 (each equipped with a third circulating water pump B9). The switching of the operating state of the aforementioned cooling water supply branch pipes B12 is achieved by opening and closing multiple third manual switching valves B13. Specifically, when n≤3, there are n+1 units of both the second circulating water pump B5 and the third circulating water pump B9, and n+1 branches of both the cold water supply branch pipe B10 and the cooling water supply branch pipe B12; when n≥4, there are n units of both the second circulating water pump B5 and the third circulating water pump B9, and n branches of both the cold water supply branch pipe B10 and the cooling water supply branch pipe B12. In addition, a control valve B14 is installed on each of the cold water supply pipe B3, cold water return pipe B4, cooling water supply pipe B7, and cooling water return pipe B8.

[0020] Piping unit C includes a heat pump supply main pipe C1 and a heat pump return main pipe C2 installed at the top of the building, a cold water supply main pipe C3 and a cold water return main pipe C4 installed at the bottom of the building, and a supply riser C5 and a return riser C6 extending from the top to the bottom of the building. The heat pump supply main pipe C1 is connected to the heat pump supply pipe A2, the heat pump return main pipe C2 is connected to the heat pump return pipe A3, the cold water supply main pipe C3 is connected to the cold water supply pipe B3, and the cold water return main pipe C4 is connected to the cold water return pipe B4. The end of the supply riser C5 is connected to the heat pump supply main pipe C1 and the cold water supply main pipe C3, and the end of the return riser C6 is connected to the heat pump return main pipe C2 and the cold water return main pipe C4. Each supply riser C5 corresponds to one return riser C6, and two risers form a group. The supply water riser C5 and return water riser C6 in the same group are connected to user equipment located on each floor of the building via pipes. The user equipment includes fan coil units C7, fresh air handling units C8, etc. The fan coil unit C7 is used to blow hot or cold air into the room, and the fresh air handling unit C8 is used to blow fresh air into the room to improve indoor air quality. A typical air conditioning system has two or more sets of supply water risers C5 and return water risers C6 arranged in parallel. In this embodiment, a total of four sets of supply water risers C5 and return water risers C6 are provided. Two sets of supply water risers C5 and return water risers C6 are connected to the fan coil units C7, and the other two sets of supply water risers C5 and return water risers C6 are connected to the fresh air handling units C8.

[0021] Each water supply riser C5 and return riser C6 is also equipped with a switching valve C9, used to adjust the operating mode of the air source heat pump unit A and the water-cooled chiller unit B in the air conditioning system. Details are as follows:

[0022] (1) During cooling: At the beginning of cooling, the end of cooling or the transition season, when the outdoor dry bulb temperature is low, open the switching valve C9 on the water supply riser C5 and the return riser C6, and start the air source heat pump unit A1 and the corresponding circulating water pump to cool all user equipment; during the middle of cooling, open the switching valve C9 on the water supply riser C5 and the return riser C6, and prioritize the start of the chiller unit B1, the cooling tower B2 and the corresponding circulating water pump to cool all user equipment; during the middle of cooling, when the cooling capacity of the chiller unit B1 does not meet the requirements, close the switching valve C9 on the water supply riser C5 and the return riser C6, and at the same time start the chiller unit B1, the air source heat pump unit A1 and the corresponding circulating water pump. Among them, the chiller unit B1 is used to cool the user equipment on the floors below the switching valve C9, and the air source heat pump unit A1 is used to cool the user equipment on the floors above the switching valve C9.

[0023] (2) When heating is provided, open the switching valve C9 on the water supply riser C5 and the return riser C6, and start the air source heat pump unit A1 and the corresponding circulating water pump to provide heating for all user equipment.

[0024] The supply riser C5 and return riser C6 of the above-mentioned sets have the same pipe diameter, and the pipe diameter of each supply riser C5 and return riser C6 is designed according to the maximum cooling load it bears. The specific design process is as follows:

[0025] (1) Calculate the cooling load Q of the air conditioning system 冷 and heat load Q 热 ;

[0026] (2) Calculate the heat load Q based on the outdoor temperature of the building's location during winter and the indoor design temperature. 热 After considering the temperature correction factor and the defrost correction factor, select either a general-type air source heat pump unit or a low-temperature air source heat pump unit, and obtain the rated cooling capacity Q of the air source heat pump. 空冷 The aforementioned air source heat pump units are responsible for providing cooling to the floors where the switching valve C9 is located and the floors above it.

[0027] (3) The cooling capacity Q provided by the chiller unit 水冷 =Q 冷 -Q 空冷 Therefore, a chiller unit was selected; the chiller unit is responsible for supplying cooling to the floors below the floor where the switching valve C9 is located;

[0028] (4) Perform hydraulic calculations such as the diameter and resistance of the air conditioning water pipes; among them, the diameter of each air conditioning water riser is determined according to the maximum air conditioning cooling load it bears, and the diameter remains unchanged from bottom to top. At this time, the riser resistance is reduced and the end resistance remains unchanged, which is conducive to the hydraulic balance of the water system.

[0029] (5) Select the corresponding circulating water pump, etc. for the air source heat pump unit;

[0030] (6) Select the corresponding chilled water circulating pump, cooling water circulating pump, cooling tower, etc. for the chiller unit.

[0031] Typically, all switching valves C9 are installed on the same floor of the building, and are 1.2m above the ground level of that floor, for easy operation by workers.

[0032] It should be noted that in the description of this utility model, terms such as "front", "rear", "left", "right", "vertical", "horizontal", "inner", and "outer" indicating orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

Claims

1. A combined cooling and heating system of an air source heat pump and a water-cooled chiller, characterized in that: Includes air-source heat pump units, water-cooled chiller units, and piping units. The air source heat pump unit includes an air source heat pump unit, which is equipped with a heat pump water supply pipe and a heat pump water return pipe. A first circulating water pump is installed on the heat pump water supply pipe, and a first return water processor is installed on the heat pump water return pipe. The water-cooled chiller unit includes a chiller unit and a cooling tower. The evaporator of the chiller unit is equipped with a chilled water supply pipe and a chilled water return pipe. A second circulating water pump is installed on the chilled water supply pipe, and a second return water processor is installed on the chilled water return pipe. A cooling water supply pipe and a cooling water return pipe are installed between the condenser of the chiller unit and the cooling tower. A third circulating water pump is installed on the chilled water supply pipe. The piping unit includes a heat pump supply main pipe and a heat pump return main pipe installed at the top of the building, a cold water supply main pipe and a cold water return main pipe installed at the bottom of the building, and supply risers and return risers extending from the top of the building to the bottom. The heat pump supply main pipe is connected to the heat pump supply pipe, the heat pump return main pipe is connected to the heat pump return pipe, the cold water supply main pipe is connected to the cold water supply pipe, and the cold water return main pipe is connected to the cold water return pipe. The end of the supply riser is connected to the heat pump supply main pipe and the cold water supply main pipe, and the end of the return riser is connected to the heat pump return main pipe and the cold water return main pipe. Each supply riser and return riser is equipped with a switching valve. Each supply riser and one return riser are configured as a group. The supply risers and return risers in the same group are connected to user equipment installed on each floor of the building through pipes.

2. The combined cooling and heating system of air source heat pump and water-cooled chiller unit according to claim 1, characterized in that: Control valves are installed on the heat pump water supply pipe, heat pump water return pipe, cold water supply pipe, cold water return pipe, cooling water supply pipe, and cooling water return pipe.

3. The combined cooling and heating system of air source heat pump and water-cooled chiller unit according to claim 1, characterized in that: The heat pump water supply pipe is connected in parallel to the heat pump water supply main pipe through heat pump water supply branch pipes. The first circulating water pump is installed on the heat pump water supply branch pipe and the pipeline is switched through the first manual switching valve. There are m units of the air source heat pump unit. When m≤3, there are m+1 units of the first circulating water pump and m+1 heat pump water supply branch pipes. When m≥4, there are m units of the first circulating water pump and m heat pump water supply branch pipes.

4. The combined cooling and heating system of air source heat pump and water-cooled chiller unit according to claim 1, characterized in that: The chiller unit and cooling tower are each equipped with n units; the chilled water supply pipe is connected in parallel to the chilled water supply main pipe through chilled water supply branch pipes; the second circulating water pump is installed on the chilled water supply branch pipe and the pipeline is switched through a second manual switching valve; the cooling water supply pipe is equipped with parallel cooling water supply branch pipes, and the third circulating water pump is installed on the cooling water supply branch pipe and the pipeline is switched through a third manual switching valve; when n≤3, the second and third circulating water pumps are each equipped with n+1 units, and the chilled water supply branch pipes and cooling water supply branch pipes are each equipped with n+1 lines; when n≥4, the second and third circulating water pumps are each equipped with n units, and the chilled water supply branch pipes and cooling water supply branch pipes are each equipped with n lines.

5. The combined cooling and heating system of air source heat pump and water-cooled chiller unit according to claim 1, characterized in that: The water supply riser and return riser are connected in parallel in two or more sets. The water supply riser and return riser in the same set have the same pipe diameter. Each water supply riser and return riser is designed with a pipe diameter according to the maximum cooling load it bears.

6. The combined cooling and heating system of air source heat pump and water-cooled chiller unit according to claim 1, characterized in that: The user equipment includes fan coil units and fresh air handling units.

7. The combined cooling and heating system of air source heat pump and water-cooled chiller unit according to claim 1, characterized in that: All the switching valves are installed on the same floor of the building, and are 1.2m above the ground of the floor.

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