An energy efficiency diagnostic device for air conditioning chiller units in railway stations

Abstract

This utility model relates to an energy efficiency diagnostic device for a railway station air conditioning chiller unit, including a differential pressure detection device installed at the main inlet and outlet of the evaporator and condenser, which is used to detect the flow rate inside; a first temperature detection device installed at the main inlet and a second temperature detection device installed at the main outlet; the differential pressure sensor, the first temperature detection device and the second temperature detection device have the same structure, and the first temperature detection device and the second temperature detection device are used to detect the temperature of the heat exchange medium flowing inside. The cooperation of the first temperature detection device and the second temperature detection device can detect the temperature of the internal heat exchange medium, and the differential pressure detection device can detect the pressure difference of the heat exchange medium flowing through the evaporator and condenser. Based on the detection data, the total energy exchange of the heat exchange medium can be calculated, which can be obtained by combining with the built-in power monitoring equipment.

Description

Technical Field

[0001] This utility model relates to the field of temperature control technology, and in particular to an energy efficiency diagnostic device for air conditioning chiller units in railway stations. Background Technology

[0002] With the continuous increase in building energy consumption, the central air conditioning system, as one of the main energy-consuming devices in large public buildings, directly affects the overall energy consumption due to its operating efficiency. As the core component of the central air conditioning system, the energy efficiency level of the water chiller directly determines the energy-saving potential of the entire system.

[0003] Currently, energy efficiency monitoring mainly relies on rated performance parameters provided by manufacturers or simple power monitoring. Rated energy efficiency ratios are usually tested under standard operating conditions, but in actual operation, factors such as load rate, water temperature, and ambient temperature will constantly change, resulting in a large deviation between actual energy efficiency and rated value. Monitoring only the power consumption of compressors or water pumps cannot accurately reflect the impact of key factors such as heat exchange efficiency and refrigerant status on energy efficiency. Traditional methods usually rely on periodic manual testing or offline data analysis, which makes it difficult to detect energy efficiency anomalies in a timely manner, resulting in problems persisting for a long time without being corrected.

[0004] The aforementioned existing technical solutions have the following drawbacks: the energy efficiency monitoring methods have problems such as static parameters failing to reflect the actual operating status, single power monitoring failing to comprehensively assess energy efficiency, and lack of real-time diagnostic capabilities. Utility Model Content

[0005] The purpose of this invention is to provide an energy efficiency diagnostic device for air conditioning chiller units in railway stations, in order to solve the problems existing in the prior art.

[0006] The above-mentioned technical objective of this utility model is achieved through the following technical solution: An energy efficiency diagnostic device for a railway station air conditioning chiller unit includes a first temperature detection device disposed at the main water inlet and a second temperature detection device disposed at the main water outlet. The first and second temperature detection devices have identical structures and are used to detect the temperature difference of the internally flowing heat exchange medium. The first temperature detection device includes a connecting pipe, one end of which is connected to the main water inlet and the other end of which is connected to the outlet of the heat exchange tube. A threaded hole is provided at the top of the connecting pipe, and a temperature sensor is screwed into the threaded hole.

[0007] By adopting the above technical solution, the combination of the first temperature detection device and the second temperature detection device can detect the temperature difference of the internal heat exchange medium, and the pressure difference detection device can detect the pressure difference of the heat exchange medium flowing through the evaporator and condenser. By combining the detection data, the total energy exchange of the heat exchange medium can be calculated, and the total energy efficiency of the chiller unit can be known by combining it with the power monitoring equipment built into the chiller unit.

[0008] In a further embodiment, an upward cylindrical protrusion is provided at the position where the threaded hole is opened at the top of the connecting pipe. The outer surface of the cylindrical protrusion is provided with threads. A sealing sleeve is screwed onto the cylindrical protrusion. A shaft hole is provided at the center position of the top of the sealing sleeve. A sealing gasket is provided at the inner top of the sealing sleeve.

[0009] By adopting the above technical solution, the location where the temperature sensor is inserted into the connecting pipe is sealed to prevent leakage of the heat exchange medium.

[0010] In a further embodiment, an infrared thermometer is also provided on the top of the device.

[0011] By adopting the above technical solution, the infrared thermometer can detect real-time thermal energy, making it easier to determine whether the increased energy consumption is due to its own heat dissipation. When dust accumulates on the surface, it will lead to a decrease in heat dissipation efficiency.

[0012] In a further embodiment, the axial hole at the top of the sealing sleeve is used to avoid the wiring harness of the temperature sensor.

[0013] In a further embodiment, the cross-section of the connecting pipe is circular, and an insulation layer is bonded to the outer wall of the connecting pipe.

[0014] In a further embodiment, the differential pressure detection device is equipped with a display screen for displaying real-time power and total energy consumption.

[0015] In summary, this utility model has the following beneficial effects: 1. By combining the first and second temperature detection devices, the temperature difference of the internal heat exchange medium can be detected. The pressure difference detection device can detect the pressure difference of the heat exchange medium flowing through the evaporator and condenser. By combining the detection data, the total energy exchange of the heat exchange medium can be calculated. Combined with the power monitoring equipment built into the chiller unit, the total energy efficiency of the chiller unit can be known. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a structural schematic diagram illustrating the first temperature detection device of this utility model.

[0017] In the figure, 2 is the first temperature detection device; 3 is the second temperature detection device; 4 is the connecting pipe; 5 is the temperature sensor; 6 is the cylindrical protrusion; and 8 is the sleeve. Detailed Implementation

[0018] The present invention will be further described in detail below with reference to the accompanying drawings.

[0019] Identical parts are indicated by the same reference numerals. It should be noted that the terms "front," "rear," "left," "right," "upper," and "lower" used in the following description refer to the attached figures. Figure 1 In this specification, the terms "bottom surface" and "top surface," "inner" and "outer" refer to the direction toward or away from the geometry of a specific component. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this specification, "a plurality of" means two or more, unless otherwise explicitly and specifically defined by the direction of the center.

[0020] Example 1: like Figures 1-2 As shown, an energy efficiency diagnostic device for a railway station air conditioning chiller unit includes a differential pressure detection device installed at the main inlet and outlet of the evaporator and condenser, used to detect the flow rate of the internal flow; a first temperature detection device installed at the main inlet and a second temperature detection device installed at the main outlet; the differential pressure sensor, the first temperature detection device, and the second temperature detection device have the same structure, and the first and second temperature detection devices are used to detect the temperature of the internal heat exchange medium. The first temperature detection device includes a connecting pipe, one end of which is connected to the main inlet, and the other end of which is connected to the outlet of the heat exchange tube. A screw is installed at the top of the connecting pipe. Temperature sensors are screwed into the perforated and threaded holes. The cooperation of the first and second temperature detection devices can detect the temperature of the internal heat exchange medium. The differential pressure detection device can detect the pressure difference of the heat exchange medium flowing through the evaporator and condenser. Based on the detection data, the total energy exchange of the heat exchange medium can be calculated, which can be obtained by combining the built-in power monitoring equipment. An infrared thermometer is installed on the top of the device. The shaft hole at the top of the sealing sleeve 8 is used to avoid the wire harness of the temperature sensor 5. The cross-section of the connecting pipe 4 is circular, and the outer wall of the connecting pipe 4 is bonded with a heat insulation layer. The differential pressure detection device is equipped with a display screen for displaying real-time power and total energy consumption.

[0021] Specific implementation process: First, the first temperature detection device 2 is installed at the main water inlet, and the second temperature detection device 3 is installed at the main water outlet. During installation, one end of the connecting pipe 4 is connected to the unit pipe flange, and the other end is connected to the heat exchange tube outlet. The sealing sleeve 8 is tightened on the cylindrical protrusion 6 at the top of the connecting pipe 4 to ensure that the sealing gasket presses against the wire harness outlet of the temperature sensor 5 to prevent medium leakage. The insulation layer 7 is tightly bonded to the outer wall of the connecting pipe 4 with high-temperature resistant adhesive to reduce the interference of ambient temperature on the measurement. After power-on, the temperature sensor 5 is calibrated on-site using an infrared thermometer. The tightness of the sealing sleeve 8 is adjusted to ensure sealing without affecting the wire harness movement. After the display screen is initialized, it automatically reads the data from the unit's built-in power monitoring module and establishes a temperature-power data communication link. During operation, the first temperature detection device 2 at the water inlet and the second temperature detection device 3 at the water outlet synchronously collect the medium temperature. The temperature sensor 5 directly contacts the flowing medium through the threaded hole, and the measured data is transmitted to the processing unit in real time. Infrared thermometers serve as redundant measurement tools, periodically performing non-contact calibration of pipe wall temperature. The processing unit calculates the instantaneous energy efficiency ratio (EER) based on the inlet / outlet water temperature difference (Δt) and the unit's real-time power (P) using the formula COP=Q / P (where Q is the cooling capacity, proportional to Δt). The calculation results are compared and analyzed with historical data, and then dynamically updated on the display screen on top of the unit, simultaneously displaying energy efficiency changes in a trend graph. When an energy efficiency anomaly is detected, the system automatically analyzes temperature gradient changes and power fluctuation characteristics. If the temperature difference decreases but the power increases, it indicates heat exchanger scaling; if the temperature difference increases sharply, the water pump flow rate is checked. Maintenance personnel can quickly inspect the temperature sensor by observing the warning information on the display screen and utilizing the detachable design of the sealing sleeve 8.

[0022] In the embodiments disclosed in this utility model, the terms "installation," "connection," "linking," and "fixing" should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; "linking" can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the embodiments disclosed in this utility model according to the specific circumstances.

[0023] This specific embodiment is merely an explanation of the present utility model and is not intended to limit the present utility model. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but as long as they are within the scope of the claims of the present utility model, they are protected by patent law.

Claims

1. A railway station building air conditioning chiller energy efficiency diagnostic device, comprising a pressure difference detection device arranged at the total inlet and outlet of the evaporator and the condenser, the pressure difference detection device is used to detect the flow rate of the internal flow, characterized in that: It also includes a first temperature detection device (2) set at the main water inlet and a second temperature detection device (3) set at the main water outlet; the first temperature detection device (2) and the second temperature detection device (3) have the same structure. The first temperature detection device and the second temperature detection device (3) are used to detect the temperature difference of the heat exchange medium flowing inside the device. The first temperature detection device (2) includes a connecting pipe (4). One end of the connecting pipe (4) is connected to the main water inlet, and the other end of the connecting pipe (4) is connected to the outlet of the heat exchange tube. The top of the connecting pipe (4) is provided with a threaded hole, and a temperature sensor (5) is screwed into the threaded hole.

2. The energy efficiency diagnosis device for a railway station air conditioning chiller unit according to claim 1, characterized in that: The top of the connecting pipe (4) has a threaded hole and an upward cylindrical protrusion (6). The outer surface of the cylindrical protrusion (6) is threaded. A sealing sleeve (8) is screwed onto the cylindrical protrusion (6). The top center of the sealing sleeve (8) has a shaft hole and a sealing gasket is provided on the inner top of the sealing sleeve (8).

3. The energy efficiency diagnosis device for a railway station air conditioning chiller unit according to claim 1, characterized in that: An infrared thermometer is also installed on the top of the device.

4. The energy efficiency diagnosis device for a railway station air conditioning chiller unit according to claim 2, characterized in that: The shaft hole at the top of the sealing sleeve (8) is used to avoid the wiring harness of the temperature sensor (5).

5. The energy efficiency diagnosis device for a railway station air conditioning chiller unit according to claim 1, characterized in that: The cross-section of the connecting pipe (4) is circular, and an insulation layer is bonded to the outer wall of the connecting pipe (4).

6. The energy efficiency diagnostic device for a railway station air conditioning chiller unit according to claim 1, characterized in that: The differential pressure detection device is equipped with a display screen for displaying real-time power and total energy consumption.

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