Method for determining heating effect of a heating system

Abstract

The application discloses a heat supply effect judgment method of a heat supply system, and relates to the technical field of heat supply systems. The heat supply system comprises a heat supply central station and a plurality of primary network heat exchange stations. Each primary network heat exchange station governs a plurality of terminal heat using units. The method comprises the following steps: firstly, calculating the total heat supply value of the heat supply central station according to the actually measured outdoor temperature value and the total heat supply area in a time period; then, calculating the unit area heat supply amount of the heat supply central station and each primary network heat exchange station; then, judging the heat supply effect of the heat supply central station to each primary network heat exchange station according to the difference between the unit area heat supply amounts of the heat supply central station and each primary network heat exchange station; then, calculating the unit area heat supply amount of each terminal heat using unit; and then, judging the heat supply effect of each primary network heat exchange station and the terminal heat using units governed by the primary network heat exchange station according to the difference between the unit area heat supply amounts of each primary network heat exchange station and the terminal heat using units governed by the primary network heat exchange station.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of heating system, in particular to a method for judging the heating effect of a heating system. BACKGROUND

[0002] A heating system usually supplies heat to multiple primary network heat exchange stations from a heating central station, each primary network heat exchange station governs multiple end heat units and supplies heat to each end heat unit under its jurisdiction. The heating effect of the heating central station to the primary network heat exchange station and the heating effect of the primary network heat exchange station to the end heat unit are usually judged according to the heating temperature of the heating end or the instantaneous heat of the heated end.

[0003] Due to the inconsistent circulating flow of each primary network heat exchange station, the heating temperature of each primary network heat exchange station is also inconsistent. If the circulating flow of the primary network heat exchange station is very large, the heating temperature may be very low, but the end heat unit under its jurisdiction may still be overheated. Therefore, the method of judging the heating effect according to the heating temperature of the heating end has poor accuracy.

[0004] Since the heat energy attenuates from the heating end to the heated end, and the time of heat energy reaching each heated end is also inconsistent, the instantaneous heat of each heated end is quite different. Therefore, the method of judging the heating effect according to the instantaneous heat of the heated end also has poor accuracy. SUMMARY

[0005] In view of the defects in the prior art, the technical problem to be solved by the present application is to provide a method for judging the heating effect of a heating system with high accuracy.

[0006] To solve the above technical problem, the present application provides a method for judging the heating effect of a heating system, which comprises a heating central station and multiple primary network heat exchange stations. The heating central station is connected to each primary network heat exchange station through a heating pipeline. Each primary network heat exchange station governs multiple end heat units, and is connected to each end heat unit under its jurisdiction through a heating pipeline. The specific steps are as follows:

[0007] Step 1: Set a heating effect calculation period T;

[0008] Step 2: Calculate the unit area heat quantity of the heating central station in the period T, and the specific calculation formula is:

[0009]

[0010]

[0011] In the formula, Q zdQ is the unit area heat supply of the heat supply center in the T period, t0 is the start time of the T period, t e Q is the end time of the T period, Q z Q is the heat supply value of the heat supply center at the calculation time point, t zn Q is the preset indoor heat supply reference temperature, t sw Q is the measured outdoor temperature value of the heat supply system at the calculation time point, t jn Q is the preset indoor heat supply calculation temperature, q b Q is the preset heat supply system heat index value, S z Q is the total area of the heat supply center;

[0012] Step 3: For each primary network heat exchange station, collect the heat supply value of the primary network heat exchange station in the T period, and calculate the unit area heat supply of the primary network heat exchange station in the T period according to the collected value, and the specific calculation formula is:

[0013]

[0014] In the formula, Q ad Q is the unit area heat supply of the primary network heat exchange station in the T period, t0 is the start time of the T period, t e Q is the end time of the T period, Q a Q is the heat supply value of the primary network heat exchange station at the calculation time point, S a Q is the heat supply area of the primary network heat exchange station;

[0015] Step 4: From each primary network heat exchange station, select the primary network heat exchange station with the largest difference between the Q ad value and the Q zd value of the heat supply center;

[0016] If the Q ad value of the primary network heat exchange station and the Q zd value of the heat supply center meet the condition , then it is determined that the heat supply effect of the heat supply center to each primary network heat exchange station in the T period is consistent, wherein λ is a preset heat supply effect judgment threshold; otherwise, it is determined that the heat supply effect of the heat supply center to each primary network heat exchange station in the T period is not balanced;

[0017] Step 5: For each end heat using unit, collect the heat supply value of the end heat using unit in the T period, and calculate the unit area heat supply of the end heat using unit in the T period according to the collected value, and the specific calculation formula is:

[0018]

[0019] In the formula, Q bdis the unit area heat supply of the end-use heat unit in the T period, t0 is the start time of the T period, t e is the end time of the T period, Q b is the heat supply value of the end-use heat unit at the calculation time point, S b is the heat supply area of the end-use heat unit;

[0020] Step 6: for each primary network heat exchange station, from each end-use heat unit under the jurisdiction of the primary network heat exchange station, select the end-use heat unit with the maximum difference between the Q bd value of the end-use heat unit and the Q ad value of the primary network heat exchange station;

[0021] If the Q bd value of the end-use heat unit and the Q ad value of the primary network heat exchange station satisfy the condition , then it is determined that the primary network heat exchange station has a consistent heat supply effect on each end-use heat unit under its jurisdiction in the T period, otherwise it is determined that the primary network heat exchange station has an unbalanced heat supply effect on each end-use heat unit under its jurisdiction in the T period.

[0022] Further, the value of λ is set to 3%.

[0023] Further, the value of λ is set to 1%.

[0024] The heat supply effect judgment method of the heat supply system provided by the present application judges the heat supply effect according to the difference between the unit area heat supply of the heat supply end and the unit area heat supply of the heat receiving end, which not only refers to the data of the heat supply end, but also refers to the data of the heat receiving end, and the accuracy of the judgment of the heat supply effect is much higher than the existing method which only refers to the data of a single end. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 is a structural schematic diagram of a heat supply system;

[0026] Figure 2 is a unit area heat supply difference histogram of each primary network heat exchange station and the heat supply central station calculated by the heat supply effect judgment method of the heat supply system adopting the embodiment of the present application;

[0027] Figure 3 is a unit area heat supply histogram of a primary network heat exchange station calculated by the heat supply effect judgment method of the heat supply system adopting the embodiment of the present application. DETAILED DESCRIPTION

[0028] The following further describes embodiments of the present application in detail with reference to the accompanying drawings, but the embodiments are not intended to limit the present application, and any similar structures and similar changes thereof should be included in the protection scope of the present application. The present application uses the comma to indicate the relationship of the sum, and the English letters are case-sensitive.

[0029] As shown in Figure 1 The heating effect judgment method of the heating system provided by the embodiment of the present application, the heating system comprises a heating main station and a plurality of primary network heat exchange stations, the heating main station is connected with each primary network heat exchange station through a heating pipeline, each primary network heat exchange station governs a plurality of end heat using units, and each primary network heat exchange station is connected with each end heat using unit governed thereby through a heating pipeline, and the specific steps are as follows.

[0030] Step 1: Set a heating effect calculation period T;

[0031] Step 2: Calculate the unit area heating capacity of the heating main station in the T period, and the specific calculation formula is as follows:

[0032]

[0033]

[0034] In the formula, Q zd is the unit area heating capacity of the heating main station in the T period, t0 is the starting time of the T period, t e is the ending time of the T period, Q z is the heating value of the heating main station at the calculation time point, t zn is a pre-set indoor heating reference temperature (the standard value of the indoor heating reference temperature in China is 18 degrees), t sw is the measured outdoor temperature value of the heating system location at the calculation time point, t jn is a pre-set indoor heating calculation temperature (the temperature value changes according to the regional difference, for example, -20 degrees is generally set in the northeast region of China), q b is a pre-set heating system heat index value (the heat index value is set by a person according to the building type of the end heat using unit, the heat index value of the energy-saving building is set to be lower, and the heat index value of the energy-saving building is set to be higher, for example, the heat index value of the energy-saving building can be set to 40 W, and the heat index value of the energy-saving building can be set to 60 W), S z is the total heating area of the heating main station, and the total heating area of the heating main station includes the heating areas of the heating main station, all primary network heat exchange stations, and all end heat using units;

[0035] Since the heat supply value of the heat supply center in the T period is a curve varying with time, the unit area heat supply of the heat supply center in the T period is calculated by integration in this step;

[0036] Step 3: For each primary network heat exchange station, the heat supply value of the primary network heat exchange station in the T period is collected, and the unit area heat supply of the primary network heat exchange station in the T period is calculated according to the collected value, and the specific calculation formula is:

[0037]

[0038] In the formula, Q ad is the unit area heat supply of the primary network heat exchange station in the T period, t0 is the start time of the T period, t e is the end time of the T period, Q a is the heat supply value of the primary network heat exchange station at the calculation time point, S a is the heat supply area of the primary network heat exchange station;

[0039] Step 4: From each primary network heat exchange station, the primary network heat exchange station with the largest difference between the Q ad value and the Q zd value of the heat supply center is selected;

[0040] If the Q ad value of the primary network heat exchange station and the Q zd value of the heat supply center meet the condition , it is determined that the heat supply effect of the heat supply center on each primary network heat exchange station in the T period is consistent, wherein λ is a pre-set heat supply effect judgment threshold; otherwise, it is determined that the heat supply effect of the heat supply center on each primary network heat exchange station in the T period is not balanced;

[0041] In this embodiment, the value of λ is set to 3%, and in other embodiments, λ can also be set to a smaller value such as 1%, which can improve the discrimination accuracy of the heat supply effect;

[0042] Step 5: For each end heat using unit, the heat supply value of the end heat using unit in the T period is collected, and the unit area heat supply of the end heat using unit in the T period is calculated according to the collected value, and the specific calculation formula is:

[0043]

[0044] In the formula, Q bd is the unit area heat supply of the end heat using unit in the T period, t0 is the start time of the T period, t e is the end time of the T period, Q b is the heat supply value of the end heat using unit at the calculation time point, S b is the heat supply area of the end heat using unit;

[0045] Step 6: For each primary heat exchange station, select Q from the various terminal heat-using units managed by that primary heat exchange station. bd The value of Q of the primary heat exchange station ad The end unit with the largest difference in values ​​is the heating unit;

[0046] If the terminal uses the Q of the thermal unit bd The value of Q of the primary heat exchange station ad The value satisfies the condition If the heating effect of the primary heat exchange station on each of its managed terminal heat-using units is consistent during time period T, then it is determined that the heating effect of the primary heat exchange station on each of its managed terminal heat-using units is unbalanced during time period T.

[0047] Heating systems have the characteristic of cyclical operation within a certain period. Under normal weather conditions, the heating process can be approximated as a gradual, daily cycle at any given time. Therefore, analyzing the heat supply per unit area of ​​the primary heat exchange station and the terminal heat-consuming units during any given cycle to determine the consistency of their heating effects is highly accurate.

[0048] After setting the duration T of the heating effect calculation period to 24 hours, the method of this embodiment of the invention is used to calculate the heat supply per unit area of ​​each primary network heat exchange station and the main heating station in the heating system entity. Based on the calculation results, the following is obtained: Figure 2 The histograms showing the difference in heat output per unit area between each primary heat exchange station and the main heating station are shown. Figure 3 The histogram shows the heat supply per unit area for each primary heat exchange station.

[0049] Figure 2 The vertical axis represents the heat difference (unit: W / m³). 2 ), Figure 2 Each square column in the diagram represents a primary heat exchange station, from... Figure 2 It can be seen that there are significant differences in the unit area heat supply difference between each primary network heat exchange station and the main heating station. Some primary network heat exchange stations have a higher unit area heat supply than the main heating station, while others have a lower unit area heat supply. If the unit area heat supply difference between the primary network heat exchange stations and the main heating station is controlled within a certain range, it can be concluded that the heating effect from the main heating station to each primary network heat exchange station is consistent.

[0050] Figure 3 The vertical axis represents the heat value (unit: W / m³). 2 ), Figure 3 Each square column in the diagram represents a primary heat exchange station, from... Figure 3It can be seen that the difference of unit area heat supply of each primary network heat exchange station is obvious.

Claims

1. A method for judging the heating effect of a heating system, the heating system comprising a central heating station and multiple primary network heat exchange stations, the central heating station being connected to each primary network heat exchange station via heating pipelines, each primary network heat exchange station managing multiple end-user heating units, and each primary network heat exchange station being connected to each managed end-user heating unit via heating pipelines, characterized in that... The specific steps are as follows: Step 1: Set a heating effect calculation period T; Step 2: Calculate the heat supply per unit area from the main heating station during time period T. The specific calculation formula is as follows: In the formula, Q zd The heating station supplies heat per unit area within time period T, where t0 is the start time of time period T, and t e Let Q be the end time of time period T. z The heating value at the calculation time point is t (the value provided by the central heating station). zn For the preset indoor heating reference temperature, t sw t represents the measured outdoor temperature at the location of the heating system at the calculated time point. jn q is the preset indoor heating calculation temperature. b S is the pre-set thermal index value of the heating system. z The total heating area of ​​the main heating station; Step 3: For each primary heat exchange station, collect the heat supply value of that station during time period T, and calculate the heat supply per unit area of ​​that station during time period T based on the collected value. The specific calculation formula is as follows: In the formula, Q ad The heat supplied per unit area to the primary heat exchange station during time period T, where t0 is the start time of time period T, and t e Let Q be the end time of time period T. a S represents the heating value supplied by the primary heat exchange station at the calculation time point. a The heating area of ​​the primary heat exchange station; Step 4: Select Q from each primary heat exchange station. ad Value and Q of the heating station zd The heat exchange station with the largest value difference; If the Q of the heat exchange station ad Value and Q of the heating station zd The value satisfies the condition If the heating effect of the main heating station to each primary network heat exchange station is consistent within the T time period, then λ is a pre-set threshold for judging the heating effect; otherwise, the heating effect of the main heating station to each primary network heat exchange station is unbalanced within the T time period. Step 5: For each terminal heating unit, collect the heating value of that terminal heating unit within time period T, and calculate the heating capacity per unit area of ​​that terminal heating unit within time period T based on the collected value. The specific calculation formula is as follows: In the formula, Q bd The heat supplied per unit area to the terminal heating unit during time period T, where t0 is the start time of time period T, and t e Let Q be the end time of time period T. b S represents the heating value of the terminal heating unit at the calculation time point. b The heating area of ​​the terminal heating unit; Step 6: For each primary heat exchange station, select Q from the various terminal heat-using units managed by that primary heat exchange station. bd The value of Q of the primary heat exchange station ad The end unit with the largest difference in values ​​uses a heat exchanger. If the terminal uses the Q of the thermal unit bd The value of Q of the primary heat exchange station ad The value satisfies the condition If the heating effect of the primary heat exchange station on each of its managed terminal heat-using units is consistent during time period T, then it is determined that the heating effect of the primary heat exchange station on each of its managed terminal heat-using units is unbalanced during time period T.

2. The method for judging the heating effect of a heating system according to claim 1, characterized in that: The value of λ is set to 3%.

3. The method for judging the heating effect of a heating system according to claim 1, characterized in that: The value of λ is set to 1%.

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