A water chiller and a heat recovery device matched with a water pump thereof

Abstract

This utility model discloses a heat recovery device for a chiller unit and its matching water pump, relating to the field of heat recovery technology for HVAC systems. It includes a water-cooled chiller unit, a cooling water pump and its frequency converter, a chilled water pump and its frequency converter, a heat recovery device, a cooling tower, and a newly added water-cooled heat exchanger assembly and intelligent control system. By installing water-cooled heat exchangers externally to the cooling water pump motor, frequency converter, and chilled water pump motor and frequency converter, waste heat generated during equipment operation is incorporated into the heat recovery cycle. Combined with real-time monitoring of the condenser outlet water temperature, the inlet and outlet water temperatures of the heat recovery device, and the temperature of the heat-consuming equipment using temperature sensors, a PID algorithm is used to dynamically adjust the opening of the heat dissipation regulating valve and the return flow regulating valve, achieving a dynamic balance between heat recovery and heat dissipation demand. When the heat recovery capacity is insufficient, a standby cooling fan automatically starts to ensure equipment safety. This invention can significantly improve the overall energy efficiency of the system, reduce the operating time of the cooling tower, and reduce carbon emissions.

Description

Technical Field

[0001] This utility model belongs to the field of heat recovery technology for HVAC systems, and in particular relates to a heat recovery device for a chiller unit and its matching water pump. Background Technology

[0002] In existing technologies, air conditioning cold source systems with water-cooled chillers as the core are typically equipped with variable frequency pumps for chilled water / cooling water, achieving on-demand cooling by adjusting the pump speed. However, the waste heat generated on the condenser side of the chiller unit is only dissipated through the cooling tower and is not fully utilized; at the same time, the heat generated by the supporting cooling water pump motor, chilled water pump motor, and frequency converter during operation is not recovered and utilized, resulting in energy waste.

[0003] The existing technology has the following main drawbacks:

[0004] The heat recovery target is singular, focusing only on the heat of the chiller unit's condenser, without integrating the waste heat of the water pump motor and frequency converter;

[0005] The heat dissipation and heat recovery systems are independent of each other and lack coordinated control, resulting in low energy utilization.

[0006] Inverter cooling relies on an independent fan, and its cooling efficiency is greatly affected by ambient temperature. Utility Model Content

[0007] The purpose of this utility model is to provide a heat recovery device for a chiller unit and its matching water pump. By adding a water-cooled heat exchanger in the cooling water circulation loop and the chilled water circulation loop, the heat of the water pump motor and frequency converter is recovered, and the heat dissipation demand and heat recovery demand are balanced through temperature monitoring and flow regulation.

[0008] To solve the above-mentioned technical problems, this utility model is achieved through the following technical solution:

[0009] This utility model relates to a heat recovery device for a chiller unit and its matching water pump, comprising a water-cooled chiller unit, a cooling water circulation loop, a chilled water circulation loop, heat recovery and utilization equipment, and a cooling tower; the cooling water circulation loop includes: a cooling water pump and its frequency converter connected to the chiller unit's condenser; a heat-consuming end pipe connected to the heat recovery and utilization equipment; and a heat-dissipating end pipe connected to the cooling tower; the chilled water circulation loop includes: a chilled water pump and its frequency converter connected to the chiller unit's evaporator; and chilled water supply and return pipes connected to the cooling equipment; and further includes:

[0010] Water-cooled heat exchangers are installed outside the motor and frequency converter of the cooling water pump and connected to the cooling water circulation pipeline, as well as outside the motor and frequency converter of the chilled water pump and connected to the cooling water circulation pipeline.

[0011] Temperature sensors are installed on the cooling water circulation pipeline to monitor the temperature of the cooling heat recovery water and the temperature of the heat recovery equipment;

[0012] The frequency converter heat dissipation regulating valve adjusts the cooling water flow rate through the water-cooled heat exchanger based on the deviation between the condenser outlet water temperature and the set value.

[0013] The heat dissipation regulating valve and the return flow regulating valve adjust the flow rate of cooling water to the cooling tower based on the deviation between the outlet water temperature of the equipment used for recovering heat and the set value.

[0014] As a preferred embodiment of this utility model, the water-cooled heat exchanger includes:

[0015] A water-cooled heat exchanger for a cooling water pump motor that is in contact with the heat dissipation surface of the cooling water pump motor.

[0016] The water-cooled heat exchanger of the cooling water pump inverter is in contact with the heat dissipation surface of the cooling water pump inverter.

[0017] A water-cooled heat exchanger for a chilled water pump motor that is in contact with the heat dissipation surface of the chilled water pump motor;

[0018] Water-cooled heat exchanger for chilled water pump inverter that is in contact with the heat dissipation surface of the chilled water pump inverter;

[0019] The water-cooled heat exchanger is connected in parallel to the cooling water circulation pipeline.

[0020] As a preferred embodiment of this utility model, the temperature sensor includes:

[0021] The first temperature sensor is installed at the inlet of the cooling water circulation pipeline to monitor the condenser outlet water temperature.

[0022] The second temperature sensor is installed at the outlet of the cooling water circulation pipeline to monitor the inlet water temperature of the heat recovery equipment.

[0023] The third temperature sensor is installed at the water inlet of the heat recovery and utilization equipment to monitor the water inlet temperature of the heat-using equipment.

[0024] The fourth temperature sensor is installed at the outlet of the heat recovery equipment to monitor the outlet water temperature of the heat-using equipment.

[0025] As a preferred embodiment of this utility model, the inverter heat dissipation regulating valve is a PID control valve, and its opening regulation logic is as follows:

[0026] When the measured value of the condenser outlet water temperature is lower than the set value, reduce the valve opening to increase the cooling water flow through the water-cooled heat exchanger.

[0027] When the measured value of the condenser outlet water temperature is higher than the set value, increase the valve opening to reduce the flow rate of cooling water through the water-cooled heat exchanger.

[0028] As a preferred embodiment of this utility model, the heat dissipation regulating valve and the return flow regulating valve are a linked regulating valve group, and their opening adjustment logic is as follows:

[0029] When the measured value of the outlet water temperature of the heat recovery equipment is higher than the set value, increase the opening of the heat dissipation regulating valve and decrease the opening of the return regulating valve to increase the flow rate of cooling water to the cooling tower.

[0030] When the measured outlet water temperature of the heat recovery equipment is lower than the set value, reduce the opening of the heat dissipation regulating valve and increase the opening of the return flow regulating valve to reduce the flow rate of cooling water to the cooling tower.

[0031] As a preferred embodiment of this utility model, the cooling water circulation loop is further provided with:

[0032] Backup cooling fan assembly, including:

[0033] Each has its own independent cooling fan corresponding to the cooling water pump motor, cooling water pump inverter, chilled water pump motor, and chilled water pump inverter;

[0034] The cooling fan starts when the water-cooled heat exchanger's heat dissipation capacity is insufficient, and ensures the equipment's operating temperature through forced convection cooling.

[0035] This utility model has the following beneficial effects:

[0036] This utility model provides a heat recovery device for a chiller unit and its matching water pump. Based on traditional chiller heat recovery, it recovers heat from the water pump motor and frequency converter by adding a water-cooled heat exchanger, and achieves a dynamic balance between heat dissipation and recovery by combining temperature monitoring and flow regulation. Its beneficial effects include: significantly improving energy utilization efficiency, additionally recovering heat related to the water pump, and increasing system energy saving rate; and ensuring stable equipment operating temperature through intelligent regulation, avoiding the risk of overheating.

[0037] Of course, any product implementing this utility model does not necessarily need to achieve all of the advantages described above at the same time. Attached Figure Description

[0038] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0039] Figure 1 This is a schematic diagram of the structure of this utility model;

[0040] The attached diagram lists the components represented by each number as follows:

[0041] 1-Water-cooled chiller unit; 1.1-Condenser; 1.2-Evaporator; 2-Cooling water pump; 2.1-Cooling water pump impeller; 2.2-Cooling water pump motor; 2.3-Cooling water pump motor water-cooled heat exchanger; 2.4-Cooling water pump motor cooling fan; 3-Cooling water pump frequency converter; 3.1-Cooling water pump frequency converter; 3.2-Cooling water pump frequency converter water-cooled heat exchanger; 3.3-Cooling water pump frequency converter cooling fan; 4-Equipment for recovering heat; 5-Cooling equipment; 6-Cooling and regulating equipment. 7-Cooling tower; 8-Return regulating valve; 9-Chiller water pump; 9.1-Chiller water pump impeller; 9.2-Chiller water pump motor; 9.3-Chiller water pump motor water-cooled heat exchanger; 9.4-Chiller water pump motor cooling fan; 9.4-Chiller water pump motor cooling fan; 10-Chiller water pump frequency converter; 10.1-Chiller water pump frequency converter; 10.2-Chiller water pump frequency converter water-cooled heat exchanger; 10.3-Cooling water pump frequency converter cooling fan; 11-Frequency converter heat dissipation regulating valve. Detailed Implementation

[0042] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0043] In the description of this utility model, it should be understood that the terms "opening", "upper", "lower", "thickness", "top", "middle", "length", "inner", "around" and other terms indicating orientation or positional relationship are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the components or elements referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0044] Please see Figure 1 As shown, this utility model is a heat recovery device for a chiller unit and its matching water pump, including a water-cooled chiller unit, a cooling water circulation loop, a chilled water circulation loop, heat recovery and utilization equipment, and a cooling tower; the cooling water circulation loop includes: a cooling water pump and its frequency converter connected to the chiller unit's condenser; a heat-using end pipe connected to the heat recovery and utilization equipment; and a heat-dissipating end pipe connected to the cooling tower; the chilled water circulation loop includes: a chilled water pump and its frequency converter connected to the chiller unit's evaporator end; and chilled water supply and return pipes connected to the cooling equipment; and further includes:

[0045] Water-cooled heat exchangers are installed outside the motor and frequency converter of the cooling water pump and connected to the cooling water circulation pipeline, as well as outside the motor and frequency converter of the chilled water pump and connected to the cooling water circulation pipeline.

[0046] Temperature sensors are installed on the cooling water circulation pipeline to monitor the temperature of the cooling heat recovery water and the temperature of the heat recovery equipment;

[0047] The inverter heat dissipation regulating valve adjusts the cooling water flow rate through the water-cooled heat exchanger based on the deviation between the condenser outlet water temperature and the set value.

[0048] The heat dissipation regulating valve and the return flow regulating valve adjust the flow rate of cooling water to the cooling tower based on the deviation between the outlet water temperature of the equipment used for recovering heat and the set value.

[0049] A specific implementation application of this embodiment is described below:

[0050] This utility model adds a component to an air conditioning cold source system (hereinafter referred to as the conventional process system) that is based on a water-cooled chiller unit and equipped with a chilled / cooling heat recovery water pump frequency conversion technology and operates in a conventional heat recovery process, in order to recover the heat of the water pump motor and its matching frequency converter.

[0051] The conventional process system consists of a water-cooled chiller unit 1, a cooling water pump 2 and a cooling water pump frequency converter 3, a heat recovery and utilization device 4, a cooling tower 7, a chilled water pump 9 and a chilled water pump frequency converter 10, a cooling equipment 5, and matching electric valves (6 and 8 in the figure) and pipelines. The purpose of the process is to absorb the heat from the cooling equipment 5 and transfer it to the heat recovery and utilization device 4 for use. If there is any residual heat, it is transferred to the cooling tower 7 and then dissipated outdoors. This process is divided into three parts: 1. Heat transfer (cooling) cycle, 2. Heat absorption cycle, and 3. Cooling heat recovery (heat dissipation) cycle. The specific details of the three processes are as follows:

[0052] 1. Heat transfer (refrigeration) cycle: The water-cooled chiller unit 1 consists of a condenser 1.1, an evaporator 1.2, and a refrigerant circulation pipeline (pipes with arrows in the dashed box); the evaporator 1.2 absorbs heat from the chilled return water, cools it down, and turns it into chilled supply water. The heat is transferred to the condenser 1.1 through the refrigerant circulation. The condenser 1.1 dissipates the heat to the cooling heat recovery return water, raising its temperature and turning it into cooling heat recovery supply water.

[0053] 2. Heat absorption circulation: After the chilled water supply circulates to the cooling equipment 5, it absorbs heat and becomes chilled return water. The chilled return water then circulates back to the evaporator 1.2, thus forming a chilled water circulation loop. The chilled water pump 9 provides power for the chilled water circulation. The chilled water pump motor 9.2 drives the chilled water pump impeller 9.1 to drive the chilled water flow. The chilled water pump inverter 10.1 in the chilled water pump inverter device 10 can adjust the input power of the chilled water pump motor 9.2, thereby adjusting its output power to the chilled water pump impeller 9.1, and thus adjusting the flow rate of the chilled water circulation to match the cooling demand of the cooling equipment 5. The chilled water pump motor 9.2 and the chilled water pump inverter 10.1 will dissipate heat during operation. The conventional heat dissipation method is to dissipate heat through the cooling fan 9.4 of the chilled water pump motor and the cooling fan 10.3 of the cooling water pump inverter, respectively.

[0054] 3. Cooling heat recovery (heat dissipation) cycle: The cooling heat recovery water circulates to the heat recovery equipment 4, where it dissipates heat and cools down, becoming cooling heat recovery return water. When there is still a significant amount of heat remaining in the cooling heat recovery return water, part or all of it (by adjusting the flow rate via the heat dissipation regulating valve 6 and the return flow regulating valve 8) is circulated to the cooling tower 7 to dissipate the heat outdoors, and then circulates back into the condenser 1.1, thus forming a cooling heat recovery cycle loop. The cooling water pump 2 provides power for the cooling heat recovery water circulation, wherein the cooling water pump motor 2.2 drives the cooling water pump impeller 2.1, which in turn drives the cooling heat recovery water flow. The input power of the cooling water pump motor 2.2 can be adjusted by the cooling water pump inverter 3.1 in the cooling water pump inverter device 3, thereby adjusting its output power to the cooling water pump impeller 2.1, and thus adjusting the flow rate of the cooling heat recovery water circulation to match the heat dissipation requirements of the condenser 1.1 (the heat dissipation requirements take priority over the heat recovery requirements). The cooling water pump motor 2.2 and the cooling water pump inverter 3.1 will dissipate heat during operation. The conventional heat dissipation method is to dissipate heat through the cooling water pump motor cooling fan 2.4 and the cooling water pump inverter cooling fan 3.3, respectively.

[0055] Based on the above conventional process, this utility model adds a chilled water pump motor water-cooled heat exchanger 9.3, a chilled water pump inverter water-cooled heat exchanger 10.2, a cooling water pump motor water-cooled heat exchanger 2.3, and a cooling water pump inverter water-cooled heat exchanger 3.2. Cooling heat recovery water flows through the above heat exchangers to recover the heat dissipated by the water pump motor and inverter.

[0056] Four temperature sensors were added and installed at the following locations: chiller cooling heat recovery outlet water temperature measuring point T3, chiller cooling heat recovery inlet water temperature measuring point T2, heat recovery equipment outlet water temperature measuring point T1, and heat recovery equipment inlet water temperature measuring point T4. Based on the deviation between the measured values ​​and the set values ​​at these four temperature measuring points, and in conjunction with the device mentioned herein, the balance between the heat dissipation requirements of the chiller + water pump motor + frequency converter and the heat recovery requirements is monitored. The specific process is as follows:

[0057] When the measured temperature of the outlet water temperature measuring point T3 of the chiller cooling heat recovery is lower than the set value, it indicates that the heat recovery demand is greater than the total heat dissipation of the chiller + water pump motor + frequency converter. At this time, by reducing the opening of the added frequency converter heat dissipation regulating valve 11, the water flow of the above four types of water-cooled heat exchangers is increased, thereby increasing the heat recovery of the motor and frequency converter, and thus increasing the temperature of the inlet water temperature measuring point T4 of the equipment using the recovered heat, matching the heat dissipation and heat recovery demand; conversely, the opening of the frequency converter heat dissipation regulating valve 1 is increased.

[0058] When the measured temperature at the outlet water temperature measuring point T1 of the heat recovery equipment is higher than the set value, it indicates that the heat recovery amount is less than the total heat dissipation demand of the chiller + water pump motor + frequency converter. At this time, by increasing the opening of the heat dissipation regulating valve 6 and decreasing or closing the opening of the return regulating valve 8, more cooling water flows into the cooling tower 7, thereby increasing the heat dissipation capacity and reducing the inlet water temperature measuring point T2 of the chiller cooling heat recovery equipment, thus meeting the heat dissipation requirements of the chiller, water pump motor and frequency converter. Conversely, the opening of the heat dissipation regulating valve 6 is decreased or closed, and the opening of the return regulating valve 8 is increased.

[0059] When the water-cooled heat recovery (heat dissipation) cycle cannot meet the heat dissipation requirements of the water pump motor and frequency converter, the cooling fans 9.4, 10.3, 2.4, and 3.3 of the chilled water pump motor and frequency converter start running to dissipate excess heat from the water pump motor and frequency converter, thereby ensuring the normal operation of the motor and frequency converter.

[0060] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0061] The preferred embodiments of this utility model disclosed above are merely illustrative of the present utility model. These preferred embodiments do not exhaustively describe all details, nor do they limit the utility model to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of this utility model, thereby enabling those skilled in the art to better understand and utilize it. This utility model is limited only by the claims and their full scope and equivalents.

Claims

1. A heat recovery device for a water chiller unit and its matching water pump, comprising a water-cooled water chiller unit, a cooling water circulation loop, a chilled water circulation loop, heat recovery and utilization equipment, and a cooling tower; The cooling water circulation loop includes: Cooling water pump and its frequency converter connected to the condenser of the chiller unit; The heat-consuming end pipe connected to the heat recovery and utilization equipment; The heat dissipation pipes connected to the cooling tower; The chilled water circulation loop includes: Chilled water pump connected to the evaporator of the chiller unit and its frequency converter; Chilled water supply and return pipes connected to the refrigeration equipment; characterized in that Also includes: Water-cooled heat exchangers are installed outside the motor and frequency converter of the cooling water pump and connected to the cooling water circulation pipeline, as well as outside the motor and frequency converter of the chilled water pump and connected to the cooling water circulation pipeline. Temperature sensors are installed on the cooling water circulation pipeline to monitor the temperature of the cooling heat recovery water and the temperature of the heat recovery equipment; The frequency converter heat dissipation regulating valve adjusts the cooling water flow rate through the water-cooled heat exchanger based on the deviation between the condenser outlet water temperature and the set value. The heat dissipation regulating valve and the return flow regulating valve adjust the flow rate of cooling water to the cooling tower based on the deviation between the outlet water temperature of the equipment used for recovering heat and the set value.

2. The water chiller and its matched water pump heat recovery device according to claim 1, characterized in that, The water-cooled heat exchanger includes: A water-cooled heat exchanger for a cooling water pump motor that is in contact with the heat dissipation surface of the cooling water pump motor. The water-cooled heat exchanger of the cooling water pump inverter is in contact with the heat dissipation surface of the cooling water pump inverter. A water-cooled heat exchanger for a chilled water pump motor that is in contact with the heat dissipation surface of the chilled water pump motor; Water-cooled heat exchanger for chilled water pump inverter that is in contact with the heat dissipation surface of the chilled water pump inverter; The water-cooled heat exchanger is connected in parallel to the cooling water circulation pipeline.

3. The water chiller and its matched water pump heat recovery device according to claim 1, characterized in that, The temperature sensor includes: The first temperature sensor is installed at the inlet of the cooling water circulation pipeline to monitor the condenser outlet water temperature. The second temperature sensor is installed at the outlet of the cooling water circulation pipeline to monitor the inlet water temperature of the heat recovery equipment. The third temperature sensor is installed at the water inlet of the heat recovery and utilization equipment to monitor the water inlet temperature of the heat-using equipment. The fourth temperature sensor is installed at the outlet of the heat recovery equipment to monitor the outlet water temperature of the heat-using equipment.

4. The water chiller and its matched water pump heat recovery device according to claim 1, characterized in that, The inverter heat dissipation regulating valve is a PID control valve, and its opening regulation logic is as follows: When the measured value of the condenser outlet water temperature is lower than the set value, reduce the valve opening to increase the cooling water flow through the water-cooled heat exchanger. When the measured value of the condenser outlet water temperature is higher than the set value, increase the valve opening to reduce the flow rate of cooling water through the water-cooled heat exchanger.

5. The water chiller and its matched water pump heat recovery device according to claim 1, characterized in that, The heat dissipation regulating valve and the return flow regulating valve are a linked regulating valve group, and their opening regulation logic is as follows: When the measured value of the outlet water temperature of the heat recovery equipment is higher than the set value, increase the opening of the heat dissipation regulating valve and decrease the opening of the return regulating valve to increase the flow rate of cooling water to the cooling tower. When the measured outlet water temperature of the heat recovery equipment is lower than the set value, reduce the opening of the heat dissipation regulating valve and increase the opening of the return flow regulating valve to reduce the flow rate of cooling water to the cooling tower.

6. The water chiller and its matched water pump heat recovery device according to claim 1, characterized in that, The cooling water circulation loop is also equipped with: Backup cooling fan assembly, including: Each has its own independent cooling fan corresponding to the cooling water pump motor, cooling water pump inverter, chilled water pump motor, and chilled water pump inverter; The heat dissipation fan is started when the water-cooled heat exchanger is insufficient in heat dissipation capacity, and forced convection heat dissipation is used to guarantee the equipment operation temperature.

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