A method, device and application for regulating end heat balance in a building central heating system

Abstract

The present invention discloses a method for regulating the heat balance at the end of a building central heating system, which is characterized by the following specific steps: S1. Divide the central heating system into several heating loops, each of which is controlled by an independent loop control system, and divide each heating loop into several areas; S2. Start heating; S3. Determine whether the indoor temperature is lower than the temperature set by the thermostat; S4. If the indoor temperature is higher than the temperature set by the thermostat, the temperature control valve closes and does not participate in the regulation, and then repeat S3; S5. If the indoor temperature is lower than the temperature set by the thermostat, the temperature control valve opens for regulation; Compared with the prior art, the present invention improves the heat balance of heat users in the building central heating system, improves the heat utilization rate, saves resources, increases the human body comfort, and judges the temperature change rate of the temperature in each area; At the same time, the heat energy distribution can be adjusted to make the heating more harmonious, improve the heat energy utilization rate, and save resources.

Description

Technical Field

[0001] The present invention relates to the field of heating automation, and particularly to a method, device and application for regulating the heat balance at the end of a building central heating system. Background Art

[0002] The thermal imbalance of users in the secondary pipe network of a central heating system is a common phenomenon in the central heating system: due to reasons such as the floor of the user and the location of the heating room (whether the end is in a favorable or unfavorable position), the heat supply to users is unbalanced, mainly manifested as uneven heating and cooling in each area. In the overheated area, energy waste may occur, while in the colder area, the user comfort level decreases and the number of complaints increases.

[0003] Common technical control means for this problem include: using a balance valve to re-distribute and control the flow rate of heat users; installing a temperature control regulating valve at the end to control the flow rate of heat users; installing a differential pressure control valve in the pipeline to regulate the differential pressure between the unfavorable loop and the favorable loop; installing an energy meter and a regulating valve at the user end to control the heat quantity, etc., to solve the heat balance problem and reduce the system energy consumption.

[0004] During actual regulation, in some areas, when the building is in different times and different weathers, the heat transfer through the building envelope changes greatly. Usually, when there is no sunlight and when there is sufficient sunlight, the heat transfer through the building envelope in each heating area of the building varies greatly, and at this time, uneven heating and cooling in the building heating area are likely to occur: assume that when the heating system just starts heating, the temperatures of the "sunny side" (mainly referring to the south facing the sun, and secondly referring to the east and west sides with the same sunlight conditions (specifically in the northern hemisphere)) and the "shady side" (mainly referring to the north side without sunlight conditions (specifically in the northern hemisphere)) of the building have not reached the set temperature. At this time, all the valves for regulating the flow rate are at the maximum opening. It is very likely that due to excessive heat transfer through the building envelope on the sunny side of the building, the indoor set temperature is reached earlier than that on the "shady side" of the building. After the indoor temperature reaches the set value, the regulating valve in the "sunny side" area will then close or be at a smaller opening. At this time, the heating effect on the "shady side" begins to improve until it slowly reaches the set temperature. Therefore, when the weather is good and there is sufficient sunlight, during the process from the start of heating until all areas of the building reach the set temperature, the "sunny side" of the building will meet the temperature setting requirements in advance, resulting in a relatively decreased comfort level and an increased number of complaints for the users on the "shady side". In some cases, even if the flow regulating valve in the "sunny side" area is fully closed, the indoor temperature will still gradually be higher than the set temperature, causing overheating, while it is very difficult for the "shady side" to reach the set indoor temperature.

[0005] In the centralized heating system of buildings in some areas, the secondary heat supply of heat users often shows uneven heating and cooling. The common regulation methods are to increase the regulation of temperature control valves and increase the flow regulation of various balance valves. However, if the change of heat transfer through the building envelope is not considered, when there is sufficient sunlight, it will still cause the indoor temperature on the "sunny side" of the building to rise too fast, and the indoor temperature will reach the set value faster than the "shaded side" of the building, resulting in uneven heating and cooling in the internal heating area of the building. Summary of the Invention

[0006] To solve the problem of uneven heating and cooling in the secondary heat supply of heat users in the prior art, the purpose of the present invention is to provide a method, device and application for adjusting the heat balance at the end of a building centralized heating system to improve the heat balance in the building centralized heating system.

[0007] To achieve the above objectives, the present invention adopts the following technical solutions:

[0008] A method for adjusting the heat balance at the end of a building centralized heating system includes the following specific steps: S1. Divide the centralized heating system into several heating loops, each heating loop is controlled by an independent loop control system, and each heating loop is divided into several areas; S2. Start heating; S3. Judge whether the indoor temperature is lower than the set temperature of the thermostat; S4. If the indoor temperature is higher than the set temperature of the thermostat, the temperature control valve is closed and does not participate in the regulation, and then repeat S3; S5. If the indoor temperature is lower than the set temperature of the thermostat, the temperature control valve is opened for regulation; S6. Collect the indoor temperature change rate at intervals of z minutes, that is, collect the data of the indoor temperature sensors in each area within a single heating loop, and calculate the indoor temperature change rate T ch / min within each area of a single heating loop every z minutes; S7. After delaying for n minutes, regulate the overall indoor temperature of the building; S8. Judge whether all areas meet the requirements; S9. If all areas meet the requirements, end the regulation; S10. If there are areas that do not meet the requirements, delay for n + t minutes after that, where t ≤ 60 min; regulate the temperature of each area within the heating loop; S11. Judge whether the total flow regulating valve of the current loop is fully opened or fully closed; S12. If the total flow regulating valve of the current loop is fully opened or fully closed, and after delaying for e minutes, increase the frequency of the hot water circulation pump; where the delayed e minutes is greater than the interval time z and is an integer multiple of the interval time z; S13. After delaying for r minutes, repeat S8 - S12.

[0009] As a further preference of the present invention, the interval time z in step S6 is set according to requirements, the interval time z is set to 0.1 min - 10 min, and in step S7, the delayed n minutes is greater than the interval time z and n is an integer multiple of z.

[0010] As a further preference of the present invention, the specific steps in step S7 are as follows: S7.1. After a delay of n minutes, calculate and determine whether the indoor temperature change rate in each area is qualified, that is, calculate the time required for the indoor temperature in the heating loop to reach the lowest heating temperature according to the temperature change rate, and determine whether this time is within the set time T; S7.2. If the indoor temperature change rate is unqualified, the temperature control valve remains at the maximum opening of 100%; S7.3. If the indoor temperature change rate is qualified, determine whether the qualified area is located on the "sunny side" of the building; S7.4. If it is not in the "sunny side" area, the temperature control valve remains in its original state, that is, fully open; S7.5. If it is on the "sunny side", determine whether the following conditions are met: 1. The indoor temperature change rate in the area is higher than the average temperature change rate; 2. The outdoor temperature sensor installed on the outer wall of the "sunny side" is warmer than the outdoor temperature sensor installed on the outer wall of the "shady side"; S7.6. If only condition 1 is met, the temperature control valve is gradually closed, and the minimum opening of the temperature control valve is set to 10%-30%; S7.7. If both conditions 1 and 2 are met, the temperature control valve is gradually closed until the temperature control valve is completely closed; S7.8. After steps S7.2, S7.4, S7.6 and S7.7 are completed, after a delay of w minutes, repeat S7.1-S7.7, where the delay w minutes is greater than the interval time z and is an integer multiple of the interval time z.

[0011] As a further preference of the present invention, in step S7.3, the "sunny side" is a fixed sunny side area preset in the system.

[0012] As a further preference of the present invention, in step S7.7, the minimum opening of the temperature control valve is 0%; in step S7.6, the minimum opening of the temperature control valve is 20%.

[0013] The requirement in step S8 is to sum up the designed heating flow rates of the areas where the temperature change rate in the heating loop is unqualified. If the obtained result reaches more than q% of the total designed heating flow rate of the area, it is determined that the area fails to meet the heating requirement, and the range of q% is 2% - 30%.

[0014] As a further preference of the present invention, the specific steps for temperature regulation of each area in the heating loop in step S10 are as follows: S10.1. Determine whether the total designed heating flow rate in the unqualified area reaches more than q% of the total designed heating flow rate of this area; S10.2. If it is less than q%, then all the total flow regulating valves in the heating loop remain in their positions unchanged; S10.3. If it is greater than or equal to q%, then the loop controller uploads the regulation result to the main controller of the heating system, and the main controller of the heating system redistributes the balance heat again; S10.4. Determine whether the average temperature change rate in the heating loop meets the requirements; S10.5. If it does not meet the requirements, then the total flow regulating valve of the loop is gradually opened; S10.6. If it meets the requirements, then the total flow regulating valve of the loop is gradually closed; S10.7. After S10.5 and S10.6 are completed, determine whether the current total flow regulating valve of the loop is opened to the maximum or closed to the minimum; S10.8. If the current total flow regulating valve of the loop is opened to the maximum or closed to the minimum, then perform S12; S10.9. If the current total flow regulating valve of the loop is not opened to the maximum or closed to the minimum; then after a delay of k minutes, repeat S10.1 - S10.8, where the delay of k minutes is greater than the interval time z and is an integer multiple of the interval time z.

[0015] An end heat balance adjustment device for a building central heating system includes a heating system pipeline arranged in each heating loop, and is characterized by including a field device for monitoring indoor temperature changes and a control device for controlling the field device. The field device includes a heat meter installed on each heating system pipeline, a total flow regulating valve arranged on each loop, an indoor temperature sensor installed in each area of the loop, a temperature control valve for regulating indoor temperature and indoor temperature change rate, and an outdoor temperature sensor installed outdoors for determining whether the building is on the "sunny side"; the control device includes a heating loop controller responsible for collecting all data of each loop and regulating the flow rate of each area in the loop, and a main controller of the heating system responsible for collecting data of the heat meters of each loop of the heating system, data of the total heat meter of the heating system loop, regulating the total flow regulating valve of the loop, regulating the temperature of the secondary side hot water of the heating system, and regulating the total flow of the heating system through a water pump.

[0016] An end heat balance adjustment method for a building central heating system is applied to large-scale central heating buildings.

[0017] An end heat balance adjustment device for a building central heating system is applied to large-scale central heating buildings.

[0018] The advantages of the present invention are as follows: The present invention improves the heat balance of heat users in a building central heating system, enhances the heat utilization rate, saves resources, and increases human comfort; by judging the temperature change rate of the temperature in each area, it reasonably and intelligently controls the indoor temperature, increasing the sensory comfort of the human body; at the same time, it can allocate the heat energy distribution, make better use of the heat energy, make the heating more harmonious, improve the heat energy utilization rate, and save resources. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is the overall regulation method flow chart of the present invention;

[0020] Figure 2 is the flow chart of the primary regulation of the indoor temperature;

[0021] Figure 3 is the regulation flow chart of the temperature in each area within the heating loop;

[0022] Figure 4 is the installation structure schematic diagram of the regulation device of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0023] The present invention will be specifically introduced below in conjunction with the accompanying drawings and specific embodiments.

[0024] Example 1, in combination with Figures 1-3 , a method for regulating the heat balance at the end of a building central heating system, comprising the following specific steps:

[0025] S1. Divide the central heating system into several heating loops, each heating loop is controlled by an independent loop control system, and each heating loop is divided into several areas;

[0026] S2. Start heating.

[0027] S3. Judge whether the indoor temperature is lower than the temperature set by the thermostat.

[0028] S4. If the indoor temperature is higher than the temperature set by the thermostat, the temperature control valve closes and does not participate in the regulation, and then S3 is repeated.

[0029] S5. If the indoor temperature is lower than the temperature set by the thermostat, the temperature control valve opens for regulation.

[0030] S6. Collect the indoor temperature change rate at intervals of z minutes, that is, collect the data of the indoor temperature sensors in each area within a single heating loop, and calculate the indoor temperature change rate T ch / min within each area of a single heating loop every z minutes.

[0031] The interval time z is set to 0.1 min - 10 min, and the interval time z is set according to requirements.

[0032] After a delay of n minutes, the overall indoor temperature of the building is regulated.

[0033] In step S6, in the said step S7,

[0034] The specific steps in step S7 are as follows:

[0035] S7.1: After a delay of n minutes, calculate and determine whether the indoor temperature change rate in each area is qualified, that is, calculate the time required for the indoor temperature in the heating loop to reach the lowest heating temperature according to the temperature change rate, and determine whether this time is within the set time T. T is the time required for the set indoor temperature to rise to the lowest heating temperature, and the lowest heating temperature is 16°C - 20°C.

[0036] The delay of n minutes is greater than the interval time z, and n is an integer multiple of z.

[0037] S7.2: If the indoor temperature change rate is unqualified, the temperature control valve remains at the maximum opening of 100%.

[0038] S7.3: If the indoor temperature change rate is qualified, determine whether the qualified area is located on the "sunny side" of the building.

[0039] The "sunny side" is a preset fixed sunny side area within the system.

[0040] S7.4: If it is not in the "sunny side" area, the temperature control valve remains in its original state, that is, fully open.

[0041] S7.5: If it is on the "sunny side", determine whether the following conditions are met:

[0042] 1. The indoor temperature change rate in the area is higher than the average temperature change rate.

[0043] 2. The outdoor temperature sensor installed on the outer wall of the "sunny side" is warmer than the outdoor temperature sensor installed on the outer wall of the "shaded side".

[0044] S7.6: If only condition 1 is met, the temperature control valve is gradually closed, and the minimum opening of the temperature control valve is set to 10% - 30%.

[0045] S7.7: If both condition 1 and condition 2 are met, the temperature control valve is gradually closed until the temperature control valve is completely closed.

[0046] The minimum opening of the temperature control valve is 0%. In step S7.6, the minimum opening of the temperature control valve is 20%.

[0047] After steps S7.8, S7.2, S7.4, S7.6, and S7.7 are completed, after a delay of w minutes, repeat S7.1 - S7.7, where the delay of w minutes is greater than the interval time z and is an integer multiple of the interval time z.

[0048] S8. Determine whether all areas meet the requirements.

[0049] The requirement is to sum the designed heating flow rates of the areas where the temperature change rate in the heating loop area is unqualified. If the result obtained reaches more than q% of the total designed heating flow rate of the area, it is determined that the area does not meet the heating requirements, and the range of q% is 2% - 30%.

[0050] S9. If all areas meet the requirements, end the regulation.

[0051] S10. If there are areas that do not meet the requirements, after a delay of n + t minutes, where t ≤ 60 min; perform temperature regulation on each area in the heating loop.

[0052] The specific steps for performing temperature regulation on each area in the heating loop in step S10 are as follows:

[0053] S10.1. Determine whether the total designed heating flow rate of the unqualified areas reaches more than q% of the total designed heating flow rate of the area.

[0054] S10.2. If it is less than q%, keep the positions of all total flow rate regulating valves in the heating loop unchanged.

[0055] S10.3. If it is greater than or equal to q%, the loop controller uploads the regulation result to the main controller of the heating system, and the main controller of the heating system performs heat balance distribution again.

[0056] S10.4. Determine whether the average temperature change rate in the heating loop meets the requirements.

[0057] S10.5. If it does not meet the requirements, gradually open the total flow rate regulating valve of the loop.

[0058] S10.6. If it meets the requirements, gradually close the total flow rate regulating valve of the loop.

[0059] S10.7. When S10.5 and S10.6 are completed, determine whether the current total flow rate regulating valve of the loop is opened to the maximum or closed to the minimum.

[0060] S10.8. If the current total flow rate regulating valve of the loop is opened to the maximum or closed to the minimum, perform S12.

[0061] S10.9. If the current total flow control valve of the loop is not fully opened or fully closed, then after a delay of k minutes, steps S10.1 - S10.8 are repeated, where the delay of k minutes is greater than the interval time z and is an integer multiple of the interval time z.

[0062] S13. After a delay of r minutes, steps S8 - S11 are repeated, where the delay of r minutes is greater than the interval time z and is an integer multiple of the interval time z.

[0063] Example 2, combined with Figure 4 , a heat balance adjustment device for the end of a building central heating system, including the heating system pipes arranged in each heating loop, including on-site devices for monitoring indoor temperature changes and control devices for controlling the on-site devices. The on-site devices include heat meters E1 - E installed on each heating system pipe n , total flow control valves CV1 - CV arranged on each loop n , indoor temperature sensors n-RT installed in each area of the loop n , temperature control valves for regulating indoor temperature and indoor temperature change rate, and outdoor temperature sensors installed outdoors for determining whether the building is on the "sunny side"; the control devices include heating loop controllers DDC 环路1 ~DDC 环路n responsible for collecting all data of each loop, regulating the flow of each area in the loop, and the main controller DDC of the heating system responsible for collecting the data of heat meters E1 - E of each loop of the heating system n , total heat meter E of the heating system loop 总 data, regulating the total flow control valves CV1 - CV of the loop n , regulating the secondary side hot water temperature of the heating system. The secondary side hot water temperature of the heating system refers to the secondary side supply water temperature of the plate heat exchanger in a central heating system with a plate heat exchanger, and regulating the total flow of the heating system through a water pump. 主控 , the heating loop controllers DDC 环路1 ~DDC 环路n collect control considerations including the temperature n-TR of each area in the loop n , temperature control valves n-TV in the control area n .

[0064] Example 3, a heat balance adjustment method for the end of a building central heating system is applied to large-scale central heating buildings.

[0065] Example 4, a heat balance adjustment device for the end of a building central heating system is applied to large-scale central heating buildings.

[0066] The advantages of the present invention are as follows: The present invention improves the heat balance of heat users in a building central heating system, enhances the heat utilization rate, saves resources, and increases human comfort; by judging the temperature change rate of the temperature in each area, it reasonably and intelligently controls the indoor temperature, increasing the sensory comfort of the human body; at the same time, it can allocate the heat energy distribution, better utilize the heat energy, make the heating more harmonious, improve the heat energy utilization rate, and save resources.

[0067] The foregoing has shown and described the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the above embodiments do not limit the present invention in any form. Any technical solutions obtained by means of equivalent replacement or equivalent transformation fall within the protection scope of the present invention.

Claims

1. A method for regulating the heat balance at the end of a building's central heating system, characterized in that, It includes the following specific steps: S1. Divide the central heating system into several heating loops, each of which is controlled by an independent loop control system, and divide each heating loop into several areas; S2. Start heating; S3. Determine whether the indoor temperature is lower than the temperature set by the thermostat; S4. If the indoor temperature is higher than the temperature set by the thermostat, the temperature control valve closes and does not participate in the regulation, and then repeat S3; S5. If the indoor temperature is lower than the temperature set by the thermostat, the temperature control valve opens for regulation; S6. Collect the indoor temperature change rate at time intervals of z minutes, that is, collect the data of the indoor temperature sensors in each area within a single heating loop, and calculate the indoor temperature change rate T ch / min within each area of a single heating loop every z minutes; S7. After a delay of n minutes, regulate the overall indoor temperature of the building; S8. Determine whether all areas meet the requirements; S9. If all areas meet the requirements, end the regulation; S10. If there are areas that do not meet the requirements, after a delay of n + t minutes, where t ≤ 60 min; regulate the temperature of each area within the heating loop; S11. Determine whether the current loop total flow regulating valve is fully opened or fully closed; S12. If the current loop total flow regulating valve is fully opened or fully closed, after a delay of e minutes, increase the frequency of the hot water circulation pump; where the delay of e minutes is greater than the interval time z and is an integer multiple of the interval time z; S13. After a delay of r minutes, repeat S8 - S12.

2. A method for regulating the heat balance at the end of a building's central heating system according to claim 1, characterized in that The intermediate interval time z in step S6 is set according to requirements. The interval time z is set to 0.1 min - 10 min. In step S7, the delayed n minutes is greater than the interval time z, and n is an integer multiple of z.

3. A method for adjusting the heat balance at the end of a building central heating system according to claim 2, characterized in that, The specific steps in step S7 are as follows: S7.1, after delaying for n minutes, calculate and determine whether the indoor temperature change rate in each area is qualified, that is, calculate the time required for the indoor temperature in the heating loop to reach the lowest heating temperature according to the temperature change rate, and determine whether this time is within the set time T; S7.2, if the indoor temperature change rate is unqualified, the temperature control valve remains at the maximum opening of 100%; S7.3, if the indoor temperature change rate is qualified, determine whether the qualified area is located on the "sunny side" of the building; S7.4, if it is not in the "sunny side" area, the temperature control valve remains in its original state, that is, fully open; S7.5, if it is on the "sunny side", determine whether the following conditions are met:

1. The indoor temperature change rate in the area is higher than the average temperature change rate; 2. The outdoor temperature sensor installed on the outer wall of the "sunny side" is warmer than the outdoor temperature sensor installed on the outer wall of the "shady side"; S7.6, if only condition 1 is met, the temperature control valve gradually closes, and the minimum opening of the temperature control valve is set to 10% - 30%; S7.7, if both conditions 1 and 2 are met, the temperature control valve gradually closes until the temperature control valve is completely closed; S7.8, after steps S7.2, S7.4, S7.6, and S7.7 are completed, after delaying for w minutes, repeat S7.1 - S7.7, where the delayed w minutes is greater than the interval time z and is an integer multiple of the interval time z.

4. A method for regulating the heat balance at the end of a building's central heating system according to claim 3, characterized in that, In step S7.3, the "sunny side" is a preset fixed sunny side area within the system.

5. A method for adjusting the heat balance at the end of a building central heating system according to claim 3, characterized in that, In step S7.7, the minimum opening of the temperature control valve is 0%; in step S7.6, the minimum opening of the temperature control valve is 20%.

6. A method for regulating the heat balance at the end of a building central heating system according to claim 1, characterized in that, The requirement in step S8 is to sum up the designed heating flow rates of the areas with unqualified area temperature change rates in the heating loop. If the obtained result reaches more than q% of the total designed heating flow rate of this area, it is determined that this area fails to meet the heating requirement. The range of q% is 2% - 30%.

7. A method for regulating the heat balance at the end of a building central heating system according to claim 1, characterized in that, The specific steps for temperature regulation in each area within the heating loop in step S10 are as follows: S10.

1. Determine whether the total designed heating flow rate in the unqualified area reaches more than q% of the total designed heating flow rate in this area; S10.

2. If it is less than q%, then all the total flow regulating valves in the heating loop remain in their positions unchanged; S10.

3. If it is greater than or equal to q%, then the loop controller uploads the regulation result to the main controller of the heating system, and the main controller of the heating system redistributes the balanced heat again; S10.

4. Determine whether the average temperature change rate within the heating loop meets the requirements; S10.

5. If it does not meet the requirements, then the total loop flow regulating valve gradually opens; S10.

6. If it meets the requirements, then the total loop flow regulating valve gradually closes; S10.

7. After S10.5 and S10.6 are completed, determine whether the current total loop flow regulating valve is fully opened or fully closed; S10.

8. If the current total loop flow regulating valve is fully opened or fully closed, then proceed to S12; S10.

9. If the current total loop flow regulating valve is not fully opened or fully closed, then after delaying for k minutes, repeat S10.1 - S10.8, where the delayed k minutes is greater than the interval time z and is an integer multiple of the interval time z.

8. An end heat balance adjustment device for a building central heating system, including a heating system pipeline arranged in each heating loop, characterized in that, It includes on-site devices for monitoring indoor temperature changes and control devices for controlling the on-site devices. The on-site devices include heat meters installed on each heating system pipeline, total flow regulating valves set on each loop, indoor temperature sensors installed in each area within the loop, temperature control valves for regulating indoor temperature and indoor temperature change rate, and outdoor temperature sensors installed outdoors for determining whether the building is on the "sunny side"; the control devices include a heating loop controller responsible for collecting all data of each loop and regulating the flow rate in each area within the loop, and a main controller of the heating system responsible for collecting data of the heat meters of each loop in the heating system, data of the total heat meter of the heating system loop, regulating the total loop flow regulating valve, regulating the temperature of the secondary side hot water in the heating system, and regulating the total flow rate of the heating system through a water pump.

9. The method for regulating the heat balance at the end of a building central heating system as described in claim 1 is applied to a large-scale central heating building.

10. The device for regulating the heat balance at the end of a building central heating system as described in claim 8 is applied to a large-scale central heating building.

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