A design method for low-temperature hot water floor radiant heating system

Abstract

The present invention discloses a design method for a low-temperature hot water floor radiant heating system, comprising the following steps: S1, calculating the heat load in each room according to the specification and the building's external envelope structure; S2, determining the number of circuits of the distributor and collector; S3, determining the laying spacing and area of ​​the radiator coil according to the room area and the heat load; S4, calculating the total circulation resistance of each household's water; S5, designing the hydraulic balance of the unit riser; connecting the unit riser with each household's inlet connecting branch pipe as a pressure regulating pipe for flow distribution between households, and adjusting the diameter of the unit riser and the inlet connecting branch pipe to make the circulation flow of water in each household reach the design value. The present invention increases the unit riser, and the unit riser and the inlet connecting branch pipe are used as pressure regulating pipes for flow distribution between households, so that the hydraulic balance design of each household's heating system can reach an ideal state, solve the temperature imbalance phenomenon between residential households, reduce the temperature difference of indoor imbalance in buildings, and change the situation of low temperature difference and large flow operation.

Description

Technical Field

[0001] The invention relates to the technical field of indoor heating, and more particularly to a design method for a low-temperature hot water floor radiation heating system. Background Art

[0002] At present, the most commonly used indoor heating method for civil buildings is low-temperature hot water floor radiation heating (floor heating). This heating method is to introduce hot water with a temperature not higher than 60°C from the outdoor heating main pipe, distribute it to the distribution and collection tanks of each heat-using unit in the building through branch pipes, and then the distribution and collection tanks of each heat-using unit distribute the hot water to the various branch coil systems buried under the floor for circulation, heating the floor, and evenly radiating heat to the room through the ground. For residential buildings, each house is a heat-using unit, and a distribution and collection tank is designed and installed in each house; for non-residential buildings, the heat-using unit is the entire area served by each distribution and collection tank on the heating riser in the building.

[0003] Low-temperature hot water floor radiant heating has incomparable advantages over traditional heating and is a new and advanced heating method. It is comfortable, hygienic, environmentally friendly, beautiful, and does not occupy a usable area; it has good thermal insulation and thermal stability; it has uniform heating temperature; it is efficient, energy-saving, and has low operating costs, and has broad development prospects.

[0004] At present, the design technology of this heating method is not yet mature. The current design results have the phenomenon of uneven indoor heating temperature in actual operation. The heating temperature of the rooms on the ground floor and top floor of the same building is lower than that of the middle floors; in the houses on the same floor, the temperature of the rooms against the gable is lower than that of other rooms in the middle.

[0005] The main reason for the above-mentioned uneven indoor heating temperature phenomenon is the hydraulic imbalance in the current design. First of all, in the current design, the laying of floor heating radiator coils is based on the full area of ​​the room. As a result, rooms with large areas, such as the living room, are relatively hot, while rooms with small areas, such as the north bedroom, are not very hot. Secondly, the lengths of the branch coils carried by the same distribution and collection device are different, and there is no controllable measure for the hot water flow rate supplied to each coil by the distribution and collection device. Theoretically, the long coil serves a large area, and more hot water flows through the coil; the short coil serves a small area, and less hot water flows through the coil. However, in actual heating operation, the fluidity of water follows the principle of least resistance. Where the resistance is small, more water goes there. The longer the radiator coil, the greater the circulation resistance, and the circulation The less the circulating water volume; the shorter the heat dissipation coil, the smaller the circulation resistance, and the more circulating water volume, which is another problem that causes uneven room temperature; the third is that the number of coil branches of the distributor and collector in the current design is determined according to the number of main rooms based on the switch function of the coil that can control each main room respectively, and is laid out with one loop in one room, resulting in an imbalance rate of 30%-50% in the circulation resistance of the several coils carried by the same distributor and collector; the fourth is that there is no effective control measure for the amount of hot water supplied from the unit riser to the distributor and collector of each household in the unit. All of them are manually debugged many times with stop valves, and it is difficult to achieve the ideal effect. At the same time, the hot water supplied by the unit riser to the distributor and collector of each household in the unit due to the gravity circulation natural additional pressure generated by the temperature drop of the hot water aggravates the vertical imbalance of the room temperature.

[0006] The above reasons are the reasons that cause the room temperature in the middle room to be too hot while the temperature in the rooms on the side, top floor and bottom floor is too low. In order to solve this problem, the heating unit generally adopts the operation mode of small temperature difference and large flow, and the temperature difference of circulating water is only about 5℃, but this operation mode has not been able to eliminate the imbalance of indoor temperature in the building. Based on this situation, in order to ensure that the room temperature of the rooms on the side, top floor and bottom floor reaches the national standard of 16℃ or above, the room temperature of the middle room is as high as 25℃ or above, and the middle room usually has windows open for heat dissipation.

[0007] Therefore, how to provide a low-temperature hot water floor radiant heating system design method to ensure that the temperature in the same building remains balanced during the heating season and prevent the occurrence of uneven room temperature is an urgent problem that technical personnel in this field need to solve. Summary of the invention

[0008] In view of this, the present invention provides a design method for a low-temperature hot water floor radiant heating system, improves the piping method of the low-temperature hot water floor radiant heating and the selection of distributors and collectors, and at the same time adds unit risers. The pressure regulating pipes that distribute flow to the indoor system are used to adjust the flow rate of hot water delivered by the unit risers to each household, so as to solve the problem of uneven room temperature in the same building in the design of low-temperature hot water floor radiant heating.

[0009] In order to achieve the above object, the present invention adopts the following technical solution:

[0010] A design method for a low-temperature hot water floor radiant heating system comprises the following steps:

[0011] S1. Calculate the heat load in each room according to the code and the building envelope;

[0012] S2. Determine the number of circuits of the manifold and water collector;

[0013] S3. Determine the laying spacing and area of ​​the heat dissipation coils according to the room area and heat load;

[0014] S4. Calculate the total resistance of water circulation in each household;

[0015] S5. Hydraulic balance design of unit risers: connect the unit risers to each household’s incoming branch pipes as pressure regulating pipes for flow distribution between households. By adjusting the diameters of the unit risers and the incoming branch pipes, the circulating flow of water in each household can reach the designed value.

[0016] The beneficial effect of the above technical solution is that by improving the pipe layout of the heat dissipation coil and the number of circuits of the distribution and collection devices in the current design, and at the same time adding unit risers as pressure regulating pipes for flow distribution between households to adjust the amount of hot water flow delivered by the unit risers to each household, the problem of uneven room temperature in the same building in the current low-temperature hot water floor radiant heating design is solved.

[0017] Preferably, in step S2, the heat dissipation coils are made of PE-X plastic pipes; and the unit risers are made of steel pipes.

[0018] Preferably, in step S2, the number of circuits of the distribution and collection water tanks is determined according to the total length of the heat dissipation coils laid in each household.

[0019] Preferably, in step S3, each heat dissipation coil of each household is numbered and the length of each heat dissipation coil and the number of 90° elbows are counted, the circulation resistance of the heat dissipation coils in multiple circuits of the branch and collector are calculated, and the imbalance rate of the heat dissipation coils in each room is controlled within ±1% by adjusting the length of the branch heat dissipation coils.

[0020] Preferably, in step S3, when the laying spacing of the heat dissipation coils is 100 mm and the total area of ​​the heat dissipation coils laid in the room does not exceed 10% of the room area, the heat dissipation coils are laid at a spacing of 100 mm over the entire area; when the total area of ​​the heat dissipation coils laid in the room exceeds 10% of the room area, the supply and return water temperatures are increased, and the spacing and area of ​​the heat dissipation coils laid in each room are redesigned according to the increased temperature, and a primary heat dissipation coil plan layout is drawn according to the laying conditions of the heat dissipation coils in each room of each household.

[0021] Preferably, the primary heat dissipation coil plan layout is modified according to the length of the branch heat dissipation coil adjusted in step S3.

[0022] Preferably, in step S4, the total circulation resistance of the household's water is calculated according to the total heat load of each household, the adjusted length of each branch coil of the household, and the heat load shared by each heat dissipation coil.

[0023] Preferably, in step S5, the circulation flow is distributed by adjusting the diameters of the unit risers and the household connection branches so that the circulation flow of each household reaches the designed value.

[0024] Preferably, steel pipes below DN15 can be used for unit risers and household connection branches.

[0025] Preferably, in step S5, the unit riser or household connection branch pipe may be divided into multiple sections of pipes with different diameters, and the design requirements may be met by adjusting the lengths of the pipes with different diameters.

[0026] It can be seen from the above technical scheme that compared with the prior art, the present invention discloses a design method for a low-temperature hot water floor radiant heating system. By adding unit risers, the unit risers are respectively connected to the pipes of the household connecting branches, and the unit risers and the household connecting branches are used as pressure regulating pipes for flow distribution between households. The hydraulic balance design of each household's heating system can achieve an ideal state, which can solve the temperature imbalance phenomenon between residential households, reduce the temperature difference of the indoor imbalance of the building, and change the situation of low temperature difference and large flow operation.

[0027] The application of this method can control the indoor temperature difference within the standard of 18±2℃; the operating temperature difference of the low-temperature hot water floor radiant heating system can be controlled within the standard of about 10℃ or more, which can reduce the circulation flow of the system and use a small flow and low head circulation water pump instead, reducing the electricity expenditure of the circulation water pump, which can achieve obvious social and economic benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0029] Figure 1 A design flow chart of the low-temperature hot water floor radiant heating system provided by the present invention;

[0030] Figure 2 This is a schematic diagram of the unit riser arrangement provided by the present invention.

[0031] in,

[0032] 1-unit one; 2-unit two; 3-left household; 4-right household; 5-unit riser; 6-household connecting branch pipe; 7-gate valve. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] The embodiment of the present invention discloses a design method for a low-temperature hot water floor radiant heating system, comprising the following steps:

[0035] S1. Calculate the heat load in each room according to the code and the building envelope;

[0036] S2. Determine the number of circuits of the manifold and water collector;

[0037] The number of circuits of the distributor and collector is determined according to the total length of the radiator coils laid in each household; the length of each circuit of the distributor and collector is 60 to 120 meters;

[0038] Number each heat dissipation coil of each household and count the length of each heat dissipation coil and the number of 90° elbows. Calculate the circulation resistance of the heat dissipation coils in multiple circuits of the branch and collector. Adjust the length of the branch heat dissipation coils to control the imbalance rate of each heat dissipation coil within ±1%;

[0039] S3. Determine the laying spacing and area of ​​the heat dissipation coils according to the room area and heat load;

[0040] For each room in each household, the spacing and area for laying the heat dissipation coils shall be determined according to the size of the room and the amount of heat load, and the influence of floor furniture coverage shall be considered at the same time; PE-X plastic pipes shall be used for heat dissipation coils for value calculation;

[0041] When the laying spacing of the heat dissipation coils is 100mm and the total area of ​​the heat dissipation coils laid in the room does not exceed 10% of the room area, the heat dissipation coil spacing is laid according to the full area of ​​100mm; when the total area of ​​the heat dissipation coils laid in the room exceeds 10% of the room area, it is necessary to increase the supply and return water temperature, and redesign the spacing and area of ​​the heat dissipation coils laid in each room according to the increased supply and return water temperature, and then draw the primary heat dissipation coil plane layout diagram according to the spacing, area and number of coil circuits of the heat dissipation coils in each room selected above, on the premise that the lengths of each coil are similar, and based on the laying conditions of the heat dissipation coils in each room of each household;

[0042] Modify the primary radiator coil layout diagram according to the adjusted length of the branch radiator coil;

[0043] S4. Calculate the total resistance of water circulation in each household;

[0044] Calculate the total circulation resistance of the household's water based on the total heat load of each household, the length of each branch coil adjusted for that household, and the heat load shared by each heat dissipation coil;

[0045] S5, hydraulic balance design of unit riser 5; connect the unit riser 5 to each household's inlet connection branch 6 as a pressure regulating pipe for flow distribution between households, and adjust the diameter of the unit riser 5 and the inlet connection branch 6 to make the circulation flow of water in each household reach the design value;

[0046] The length of a single-section unit riser 5 is about 2.9 meters. The multi-section unit riser 5 is connected in sequence according to the floor height, and the unit riser 5 is connected to the household connection branch pipe 6 of each household. The unit riser 5 and the household connection branch pipe 6 are used as pressure regulating pipes for flow distribution between households. By adjusting the diameter of the unit riser 5 and the household connection branch pipe 6, the circulation flow of each household system can reach the design value, and the imbalance rate of the circulation pressure of water between households can be controlled within ±1%.

[0047] In order to achieve hydraulic balance of the circulation loop of each household and eliminate temperature imbalance between households when designing the hydraulic balance of the unit riser 5, the present invention selects appropriate diameters for the unit riser 5 and the household connecting branch pipe 6 to reasonably distribute the circulation flow rate, so that the hydraulic imbalance rate of the circulation loop of each household is controlled within ±1%.

[0048] In order to further optimize the above technical solution, steel pipes with diameters below DN15 can be used for the unit riser 5 and the household connection branch pipe 6. When designing the hydraulic balance of the unit riser 5, the influence of the natural additional pressure of the gravity cycle needs to be taken into account. After calculation, the existing pipes with diameters above DN15 can no longer meet the needs. Therefore, pipes with diameters of DN12, DN10 or even smaller are used in the design to meet the needs of innovative design.

[0049] In order to further optimize the above technical solution, in step S5, the unit riser 5 or the household connecting branch pipe 6 can be divided into multiple sections of pipes with different diameters, and the design requirements can be met by adjusting the lengths of the pipes with different diameters.

[0050] For example, when designing the hydraulic balance of unit riser 5, the unit riser 5 should be selected to control the specific friction resistance at a level equivalent to the natural additional pressure of gravity circulation to offset the natural additional pressure of gravity circulation. If there is no pipe with a suitable diameter available for selection during the design, the pipe section can be divided into two pipes with different diameters and the lengths of the two pipe sections can be adjusted to meet the design needs. For example, if there is a 2.9-meter unit riser, the specific friction resistance of the pipe with a diameter of DN25 is a little small, and the specific friction resistance of the pipe with a diameter of DN20 is a little large, then the unit riser is divided into two sections, the upper section is a pipe with a diameter of DN20, and the lower section is a pipe with a diameter of DN25. The lengths of the upper and lower pipe sections are determined according to the requirements of the imbalance rate.

[0051] For example, when designing the hydraulic balance of the unit riser 5, if there is no pipe with a suitable diameter for the household connecting branch pipe 6, the riser can be divided into two sections of pipes with different diameters and the lengths of the two sections can be adjusted to meet the design requirements. For example, if there is a 3.0-meter unit riser, the friction resistance of the pipe with a diameter of DN12 is slightly smaller than that of the pipe with a diameter of DN10, and the friction resistance of the pipe with a diameter of DN10 is slightly larger, then the pipe section is divided into two sections, the front section is the pipe with a diameter of DN12, and the rear section is the pipe with a diameter of DN10. The lengths of the front and rear sections are determined according to the requirement of controlling the imbalance rate within ±1%.

[0052] Through research, it is found that in the hydraulic balance design of unit risers, the use of DN12 and DN10 pipes can make the hydraulic balance design of household heating systems reach an ideal state, and the imbalance rate can be controlled within ±1%. It can solve the temperature imbalance between households in residential buildings, reduce the temperature difference of indoor imbalance in buildings, and change the situation of low temperature difference and large flow operation. This method can be used to control the indoor temperature difference within the 18±2℃ specified in the specification; it can control the operating temperature difference of the low-temperature hot water floor radiant heating system to about 10℃ or more specified in the specification. In this way, the circulation flow of the system can be reduced, and a circulating water pump with a small flow and low head can be used instead, reducing the electricity expenditure of the circulating water pump, which can achieve obvious social and economic benefits.

[0053] In the design of the present invention, there are mature pipeline specific friction resistance calculation tables available for use for pipelines with diameters of DN15 and above. The newly added DN12 and DN10 unit risers have specific friction resistance calculation data for DN10 pipelines found in the "Common Data Manual for HVAC". The specific friction resistance calculation data for DN12 pipelines is derived based on the calculation formula for pipeline losses along the way, with reference to the existing specific friction resistance calculation data for DN25, DN20, DN15, and DN10 pipelines.

[0054] In order to further optimize the above technical solution, a gate valve 7 is fixed between the unit riser 5 and the branch pipe 6 connecting to each household to control the opening and closing of its passage. The gate valve 7 does not play a role in flow regulation, but only controls the on and off of the circulating water entering the household.

[0055] Embodiment 1:

[0056] This embodiment takes the basic situation of a six-story building with two units in a severe cold zone C as the design basis, and accurately calculates the heat load of each room in the building according to the requirements of the code and the actual situation of the building's plane dimensions and its external envelope structure.

[0057] The building used in this embodiment is a two-unit combined residential building with a building floor height of 2.9m and a basement floor height of 2.2m; the outer door of the stairwell is a 1.2X2.1m insulated double-mother door; the unit entrance door is a 1.0X2.1m insulated anti-theft door, and the entrance door gap length is 6.2m; the living room outer window size is 2.4X1.5m, the window gap length is 6.0m, the bedroom outer window size is 1.5X1.5m, the window gap length is 3.0m, the kitchen outer window size is 1.2X1.5m, the window gap length is 3.0m, the bathroom outer window size is 1.0X1.5m, and the window gap length is 3.0m.

[0058] The thermal parameters of the external protective structure in this embodiment are shown in Table 1:

[0059] Table 1 Thermal parameters of building envelope (severely cold C zone)

[0060]

[0061] The heat load for each room in the building is:

[0062] Heat load = external protection area * heat transfer coefficient * calculated temperature difference between indoor and outdoor * temperature difference correction factor * (1 + orientation correction factor) + heat consumption of cold air penetration

[0063] After calculation, the heat loads of the rooms on the second, third, fourth and fifth floors are the same. Therefore, the first, second and sixth floors are calculated. Taking Unit 1, Left House 3 as an example, the results are shown in Table 2:

[0064] Table 2 Heat load summary

[0065]

[0066] According to the numerical values ​​of the heat load of each room above, the floor radiation area and the spacing and length of the heat dissipation coils of each room are determined. The heat dissipation coils of this embodiment use PE-X pipes with a thermal conductivity of 0.38W / (m·K), the floor is a ceramic surface layer, the design supply and return water temperature is 45℃ / 35℃, and the average temperature is 40℃. When calculating, the influence of furniture shielding in the room is taken into account, and a correction coefficient of 1.30 is taken for the bedroom and a correction coefficient of 1.10 is taken for the living room. Since the kitchen is small in area, coils also need to be laid on the ground under the operating table. Therefore, it is required that a certain amount of heat dissipation space should be left under the operating table when decorating the kitchen, and the height should not be less than 150mm. Calculations are performed according to JGJ142-2012 Technical Code for Radiant Heating and Cooling, and the calculation results are shown in Table 3:

[0067] Table 3 Radiator coil layout design table

[0068]

[0069] According to the area, spacing and length of the heat dissipation coils in each room calculated above, calculate the total length of the coils in multiple rooms in a household, select the corresponding distribution and collection devices for the circuits, and control the coil length of each circuit between 60 and 120 meters. The lengths of the coils under each distribution and collection device should be basically the same. Then, draw the coil layout for each room of each household in the floor plan.

[0070] When the area of ​​some rooms is small but the heat load is large, and the coil spacing is 100mm, if the designed coil laying area of ​​the room does not exceed 10% of the actual area of ​​the room, the coil can be laid in the entire area at a spacing of 100mm and the residents are advised to use high-legged furniture in the room.

[0071] On the floor heating coil plan that has been drawn, the number of circuits of the distribution and collection devices used in each household and the length of each coil they carry are counted, and each coil is numbered. In this embodiment, the coil near the window is defined as the first circuit coil, and the other positions are deduced accordingly. At the same time, the number of 90° elbows with a curvature radius greater than 5d and the number of 90° elbows with a curvature radius less than 5d in each coil are counted.

[0072] The circulation resistance of each household is calculated based on the total heat load of each household, the length of each branch coil and the heat load shared by each coil. The length of the floor heating coil carried by the distribution and collection water tank in each household is adjusted on the basis of hydraulic balance. The adjustment results and the heat load and circulation resistance of each household are detailed in Table 4:

[0073] Table 4 Heat dissipation coil hydraulic calculation table

[0074]

[0075] The coil length after the heat dissipation coil hydraulic balance adjustment is shown in Table 5.

[0076] Table 5 Statistics of heat dissipation coil after adjustment

[0077]

[0078] Calculate the coil length after balancing adjustment according to Table 4, and modify the coil length based on the already drawn primary heat dissipation coil plan layout.

[0079] The unit riser 5 is connected with the household connection branch 6. The length of the household connection branch 6 is about 3m, which is equivalent to the unit riser 5 extending the household connection branch 6 by about 3m. The two are used together as a pressure regulating pipe for flow distribution between households. The circulation flow of each household system can reach the design value by adjusting the diameter of the pressure regulating pipe (unit riser 5 and household connection branch 6), and the imbalance rate of circulation resistance between households is controlled within ±1%. The unit riser 5 and the household connection branch are controlled by a gate valve 7 to control their connection or closure. The gate valve 7 does not have a flow regulation function, but only serves to shut off the household circulating water. In this embodiment, the unit riser 5 and the household connection branch are both made of steel pipes.

[0080] In some other specific embodiments, the influence of the natural additional pressure of gravity circulation shall be taken into account when calculating the hydraulic balance of the unit riser 5. The natural additional pressure of gravity circulation generated by the temperature drop of hot water is relative to the first floor. The natural additional pressure of gravity circulation generated by the second, third, fourth, fifth and sixth floors relative to the first floor. The building has a floor height of 2.9 meters. The circulating water supply of this system is 45°C and the return water is 35°C. The densities of water are 990.16kg and 993.96kg respectively. In actual operation, considering the influence of quality regulation, the influence of the natural additional pressure of gravity circulation can be considered as 2 / 3 of the maximum value of the design working condition. Since the natural additional pressure of gravity circulation is generated by the temperature drop of water, it is beneficial to the circulation of hot water, so it should be subtracted from the circulation resistance of the loop. The natural additional pressure of gravity circulation generated by each floor is as follows:

[0081] The natural additional pressure of the gravity cycle of one layer is 0;

[0082] The natural additional pressure of the gravity circulation on the second layer is

[0083] 2 / 3x(993.96-990.16)x9.8x2.9=72.00Pa;

[0084] Three layers of gravity circulation naturally add pressure

[0085] 2 / 3x(993.96-990.16)x9.8x5.8=143.99Pa;

[0086] Four layers of gravity circulation naturally add pressure

[0087] 2 / 3x(993.96-990.16)x9.8x8.7=215.99Pa;

[0088] Five layers of gravity circulation naturally add pressure

[0089] 2 / 3x(993.96-990.16)x9.8x11.6=287.99Pa;

[0090] Six layers of gravity circulation naturally add pressure

[0091] 2 / 3x(993.96-990.16)x9.8x14.5=359.99Pa.

[0092] In this embodiment, the hydraulic calculation of the unit riser 5 is as follows Figure 2 The design calculation is performed on the unit riser 5 sections, and the preliminary hydraulic force of the unit riser, the local resistance coefficient of the preliminary hydraulic force of the unit riser, the ultimate hydraulic balance calculation of the unit riser, and the local resistance coefficient of the ultimate hydraulic balance of the unit riser are calculated respectively. The specific calculation process will not be described in detail here. Figure 2The solid line represents the water inlet pipe, and the dotted line represents the water return pipe)

[0093] After calculation, the maximum circulating pressure in the unit riser system loop occurs in the circulation loop of Unit 1, 6th floor, left household 3, with a value of 12122.80Pa. Taking the circulating pressure of the household loop of 12122.80Pa as the base number and comparing it with the circulating pressures of other loops in the system, the system has hydraulic imbalance, and the maximum imbalance rate occurs in Unit 1, 2nd floor, right household 4, whose imbalance rate in the circulation loop reaches 44.96%. On this basis, taking the circulating pressure of 12122.80Pa of the circulation loop of Unit 1, 6th floor, left household 3 with the largest circulating pressure as the base number, the circulating pressures of other loops are adjusted to be close to 12122.80Pa, so that the hydraulic imbalance rate of each loop is controlled at about ±1%, and the closer to 12122.80Pa, the better.

[0094] First, start with the circulation loop of the right household 4 on the first floor of unit 2. The circulation pressure of this loop is 10718.75Pa, and the imbalance rate is 11.58%. The adjustment of this loop is to adjust the return water pressure regulating pipe of the right household 4 on the first floor of unit 2 in sections. After adjusting the position of the section diameter change several times, the pressure regulating pipe is reduced in diameter after the elbow. The length of the upper section is 1.15m, the nominal diameter is 20mm, the length of the lower section is 1.80m, the nominal diameter is 15mm, the local resistance coefficient of the part before the diameter change is 6.5, and the local resistance coefficient of the part after the diameter change is 1.0. The adjusted circulation pressure is 11 450.31Pa, the imbalance rate is 5.55%, and the adjustment effect is not ideal; continue to carry out segmented diameter reduction and pressure adjustment on the water inlet pressure regulating pipe of household 4 on the first floor of unit 2. After adjusting the position of the segmented diameter reduction for many times, the pressure regulating pipe is reduced in diameter after the elbow. The length of the upper section is 1.45m, the nominal diameter is 20mm, the length of the lower section is 1.85m, the nominal diameter is 15mm, the local resistance coefficient of the part before the diameter reduction is 9.5, and the local resistance coefficient of the part after the diameter reduction is 0.5. The adjusted circulating pressure is 12123.70Pa, the imbalance rate is -0.01%, and the adjustment effect is relatively ideal.

[0095] The circulation loop of the left household 3 on the first floor of unit 2 was adjusted. The circulation pressure of the loop was 8831.81Pa, and the imbalance rate was 27.15%. The adjustment of this loop is to change the entire section of the return water pressure regulating pipe of the left household 3 on the first floor of unit 2 from a pipe with a nominal diameter of 25mm to a pipe with a nominal diameter of 20mm, and modify the local resistance coefficient of the branch pipe after the diameter change accordingly. The adjusted circulation pressure is 9260.01Pa, and the imbalance rate is 23.61%. The adjustment effect is not ideal; continue to adjust the water inlet pressure regulating pipe of the household, and change the entire section of the pipe from a pipe with a nominal diameter of 25mm to a pipe with a nominal diameter of 20mm. Modify the local resistance coefficient of the branch pipe after the diameter change accordingly. The adjusted circulation pressure is 9659.82Pa, and the imbalance rate is 20.32%. At the same time, the diversion four-way on the first floor of unit 2 is replaced by DN50X25 from DN50X20, and the adjusted circulation pressure is 9597.79Pa, and the imbalance rate is 20.83%. The adjustment effect is not ideal. The result is not ideal; the return water pressure regulating pipe of the household is adjusted. The whole section of the pipe is changed from a pipe with a nominal diameter of 20mm to a pipe with a nominal diameter of 15mm. The local resistance coefficient of the branch pipe after the diameter change is modified accordingly. The adjusted circulation pressure is 11790.27Pa, and the imbalance rate is 2.74%. The adjustment effect is not ideal; the water inlet pressure regulating pipe of the household is continued to be segmented and reduced. After adjusting the position of the segmented diameter change several times, the pressure regulating pipe is reduced from the elbow. The upper section is 2.30m long and the nominal diameter is 20mm. The lower section is 0.80m long and the nominal diameter is 15mm. The local resistance coefficient of the part before the diameter change is 7.0, and the local resistance coefficient of the part after the diameter change is 0.5. The adjusted circulation pressure is 12115.24Pa, and the imbalance rate is 0.06%. The adjustment effect is relatively ideal. The circulation loop of the right household 4 on the first floor of unit 2 is corrected due to the adjustment of the diversion four-way.

[0096] The imbalance rate of the circulation loop of household 4 on the right side of unit 2 on the first floor before correction was -0.01%. The local resistance coefficient of the loop was modified due to the adjustment of the diversion four-way valve. The imbalance rate after modification was 0.54%. The pressure regulating pipe of this household was segmented and reduced in diameter for pressure regulation. After adjusting the position of the segmented reduction in diameter for many times, the pressure regulating pipe was reduced in diameter after the elbow. The length of the upper section was 1.25m and the nominal diameter was 20mm, and the length of the lower section was 2.05m and the nominal diameter was 15mm. The local resistance coefficient of the part before the diameter reduction was 9.0, and the local resistance coefficient of the part after the diameter reduction was 0.5. The adjusted circulation pressure was 12122.09Pa, and the imbalance rate was 0.01%. The adjustment effect was ideal.

[0097] The circulation loop of the second floor right household 4 of unit 2 was adjusted. The circulation pressure of the loop was 8137.62Pa, and the imbalance rate was 32.87%. The adjustment of the loop was to adjust the return water pressure regulating pipe of the household. The pipe was changed from a nominal diameter of 20mm to a nominal diameter of 15mm. The local resistance coefficient of the pressure regulating pipe after the diameter change was modified accordingly. The adjusted circulation pressure was 8895.12Pa, and the imbalance rate was 26.62%. The adjustment effect was not ideal; the water inlet pressure regulating pipe was adjusted again. The entire section was changed from a nominal diameter of 20mm to a nominal diameter of 15mm. The local resistance coefficient of the branch pipe after the diameter change was modified accordingly. The adjusted circulation pressure was 9879.24Pa, which was not ideal. The balance rate is 18.51%, and the adjustment effect is not ideal; continue to carry out segmented diameter reduction and pressure regulation on the water inlet pressure regulating pipe of this household. After adjusting the position of the segmented diameter reduction for many times, the pipe is reduced in diameter after being bent before the gate valve. The length of the front section is 0.45m, and the nominal diameter is 15mm. The length of the rear section is 2.85m, and the nominal diameter is 12mm. The local resistance coefficient of the part before the diameter reduction of the pipe section is 6.5, and the local resistance coefficient of the part after the diameter reduction is 5.5. The adjusted circulating pressure is 12127.41Pa, and the imbalance rate is -0.04%. The adjustment effect is relatively ideal.

[0098] The circulation loop of the left household 3 on the second floor of unit 2 was adjusted. The circulation pressure of the loop was 7487.61Pa, and the imbalance rate was 38.24%. The adjustment of the loop was to change the entire section of the return water pressure regulating pipe of the household from a pipe with a nominal diameter of 20mm to a pipe with a nominal diameter of 15mm, and modify the local resistance coefficient of the pressure regulating pipe after the diameter change accordingly. The adjusted circulation pressure was 8254.42Pa, and the imbalance rate was 31.91%, and the adjustment effect was not ideal; the entire section of the inlet pressure regulating pipe was changed from a pipe with a nominal diameter of 20mm to a pipe with a nominal diameter of 15mm, and the local resistance coefficient of the branch pipe after the diameter change was modified accordingly. The adjusted circulation pressure was 8922.83Pa, and the imbalance rate was 26.40%. At the same time, the diversion four-way on the second floor of unit 2 was changed from DN50X20 to DN50X15, and the adjusted circulation pressure was 8847.32Pa, and the imbalance rate was 27.02%, and the adjustment effect was not ideal. ; Continue to change the entire section of the return water pressure regulating pipe from a pipe with a nominal diameter of 15mm to a pipe with a nominal diameter of 12mm, and modify the local resistance coefficient of the pressure regulating pipe after the diameter change accordingly. The adjusted circulation pressure is 11354.51Pa, and the imbalance rate is 6.34%. The adjustment effect is not ideal; continue to adjust the diameter of the water inlet pressure regulating pipe in sections, and adjust the position of the section diameter change several times. The pressure regulating pipe is reduced in diameter after the elbow. The length of the front section is 1.57m, the nominal diameter is 15mm, and the length of the rear section is 1.53m, the nominal diameter is 12mm, the local resistance coefficient of the part before the diameter change is 8.0, and the local resistance coefficient of the part after the diameter change is 0.5. The adjusted circulation pressure is 12120.47Pa, and the imbalance rate is 0.02%. The adjustment effect is relatively ideal. Go back and correct the circulation loop of the second floor right household of the second unit due to the adjustment of the diversion four-way.

[0099] The imbalance rate of the circulation loop of the right household on the second floor of the second unit before correction was -0.04%. The local resistance coefficient of the loop was modified due to the adjustment of the diversion four-way valve. The imbalance rate after modification was 0.71%. The water inlet pressure regulating pipe of the household was re-diametered and pressure-regulated in sections. After several adjustments to the position of the sectioned diameter change, the pressure regulating pipe was reduced in diameter from after the gate valve to before the bracket. The length of the front section was 0.30m and the nominal diameter was 15mm, and the length of the rear section was 3.00m and the nominal diameter was 12mm. The local resistance coefficient of the part before the diameter change was 6.0, and the local resistance coefficient of the part after the diameter change was 5.5. The adjusted circulation pressure was 12118.30Pa, and the imbalance rate was 0.04%. The adjustment effect was ideal.

[0100] The circulation loop of the right household on the third floor of the second unit was adjusted. The circulation pressure of the loop was 8331.49Pa, and the imbalance rate was 31.27%. The adjustment of the loop was to change the entire section of the household return water pressure regulating pipe from a pipe with a nominal diameter of 20mm to a pipe with a nominal diameter of 15mm, and modify the local resistance coefficient of the pressure regulating pipe after the diameter change accordingly. The adjusted circulation pressure was 9088.98Pa, and the imbalance rate was 25.03%. The adjustment effect was not ideal; the entire section of the water inlet pressure regulating pipe was changed from a pipe with a nominal diameter of 20mm to a pipe with a nominal diameter of 15mm, and the local resistance coefficient of the branch pipe after the diameter change was modified accordingly. The adjusted circulation pressure was 10073.10Pa, and the imbalance rate was 16.91%, the adjustment effect is not ideal; continue to adjust the water inlet pressure regulating pipe in sections, after adjusting the position of the sectioned diameter change for many times, the pressure regulating pipe is changed in diameter from after the bend to before the gate valve, the front section is 0.50m long, the nominal diameter is 15mm, the rear section is 2.80m long, the nominal diameter is 12mm, the local resistance coefficient of the part before the diameter change is 8.0, and the local resistance coefficient of the part after the diameter change is 4.0. The adjusted circulating pressure is 12110.14Pa, the imbalance rate is 0.10%, and the adjustment effect is ideal.

[0101] The circulation loop of the left household on the third floor of the second unit was adjusted. The circulation pressure of the loop was 7681.47Pa, and the imbalance rate was 36.64%. The adjustment of the loop was to change the entire section of the household's return water pressure regulating pipe from a pipe with a nominal diameter of 20mm to a pipe with a nominal diameter of 15mm, and modify the local resistance coefficient of the pressure regulating pipe after the diameter change accordingly. The adjusted circulation pressure was 8448.28Pa, and the imbalance rate was 30.31%. The adjustment effect was not ideal; the entire section of the water inlet pressure regulating pipe was changed from a pipe with a nominal diameter of 20mm to a pipe with a nominal diameter of 15mm, and the local resistance coefficient of the branch pipe after the diameter change was modified accordingly. The adjusted circulation pressure was 9116.70Pa, and the imbalance rate was 24.80%. At the same time, the diversion four-way on the third floor of the second unit was changed from DN50X20 to DN50X15, and the adjusted circulation pressure was 9041.19Pa, and the imbalance rate was 25.42%. The adjustment effect was not ideal; The whole section of the return water pressure regulating pipe of the household was changed from a pipe with a nominal diameter of 15mm to a pipe with a nominal diameter of 12mm, and the local resistance coefficient of the pressure regulating pipe after the diameter change was modified accordingly. The adjusted circulation pressure was 11548.38Pa, and the imbalance rate was 4.74%, which was not ideal. The water inlet pressure regulating pipe of the household was further reduced in sections. After adjusting the position of the section diameter change several times, the pressure regulating pipe was reduced in diameter after the elbow. The length of the front section was 2.00m, the nominal diameter was 15mm, and the length of the rear section was 1.10m, the nominal diameter was 12mm, the local resistance coefficient of the part before the diameter change was 8.0, and the local resistance coefficient of the part after the diameter change was 0.5. The adjusted circulation pressure was 12119.96Pa, and the imbalance rate was 0.02%, which was ideal. The circulation loop of the right household on the third floor of the second unit was corrected due to the adjustment of the diversion four-way.

[0102] The imbalance rate of the circulation loop of the right household on the third floor of the second unit before correction was 0.10%. The local resistance coefficient of the loop was modified due to the adjustment of the diversion four-way valve. The imbalance rate after modification was 0.85%. The water inlet pressure regulating pipe of the household was re-diametered and pressure-regulated in sections. After several adjustments to the position of the sectioned diameter change, the pressure regulating pipe was reduced in diameter from after the gate valve to before the bracket. The length of the front section was 0.31m and the nominal diameter was 15mm, and the length of the rear section was 2.99m and the nominal diameter was 12mm. The local resistance coefficient of the part before the diameter change was 7.5, and the local resistance coefficient of the part after the diameter change was 4.0. The adjusted circulation pressure was 12122.69Pa, the imbalance rate was 0.00%, and the adjustment effect was ideal.

[0103] The circulation loop of the right household on the fourth floor of the second unit was adjusted. The circulation pressure of the loop was 8874.90Pa, and the imbalance rate was 26.79%. The adjustment of the loop was to change the entire section of the household's return water pressure regulating pipe from a pipe with a nominal diameter of 20mm to a pipe with a nominal diameter of 15mm, and modify the local resistance coefficient of the pressure regulating pipe after the diameter change accordingly. The adjusted circulation pressure was 9632.39Pa, and the imbalance rate was 20.54%. The adjustment effect was not ideal; the entire section of the household's inlet water pressure regulating pipe was changed from a pipe with a nominal diameter of 20mm to a pipe with a nominal diameter of 15mm, and the local resistance coefficient of the branch pipe after the diameter change was modified accordingly. The adjusted circulation pressure was 10616.51Pa, and the imbalance rate was 20.54%. The balance rate is 12.43%, and the adjustment effect is not ideal; the water inlet pressure regulating pipe is continued to be segmented and reduced in diameter. After adjusting the position of the segmented reduction several times, the pressure regulating pipe is reduced in diameter before the elbow. The front section is 1.15m long and the nominal diameter is 15mm, the rear section is 2.15m long and the nominal diameter is 12mm, the local resistance coefficient of the part before the diameter reduction is 9.5, and the local resistance coefficient of the part after the diameter reduction is 2.5. The adjusted circulating pressure is 12117.54Pa, and the imbalance rate is 0.04%. The adjustment effect is relatively ideal.

[0104] The circulation loop of the left household on the fourth floor of the second unit was adjusted. The circulation pressure of the loop was 8224.88Pa, and the imbalance rate was 32.15%. The adjustment of the loop was to change the entire section of the household's return water pressure regulating pipe from a pipe with a nominal diameter of 20mm to a pipe with a nominal diameter of 15mm, and modify the local resistance coefficient of the pressure regulating pipe after the diameter change accordingly. The adjusted circulation pressure was 8991.69Pa, and the imbalance rate was 25.83%. The adjustment effect was not ideal; the entire section of the household's water inlet pressure regulating pipe was changed from a pipe with a nominal diameter of 20mm to a pipe with a nominal diameter of 15mm, and the local resistance coefficient of the branch pipe after the diameter change was modified accordingly. The adjusted circulation pressure was 9660.11Pa, and the imbalance rate was 25.83%. The balance rate is 20.31%. At the same time, the diversion four-way on the fourth floor of the second unit is replaced from DN40X20 to DN40X15. The adjusted circulation pressure is 9584.60Pa, and the imbalance rate is 20.94%. The adjustment effect is not ideal; the entire section of the return water pressure regulating pipe of the household is changed from a pipe with a nominal diameter of 15mm to a pipe with a nominal diameter of 12mm, and the local resistance coefficient of the pressure regulating pipe after the diameter change is modified accordingly. The adjusted circulation pressure is 12091.79Pa, and the imbalance rate is 0.26%. The adjustment effect is relatively ideal. Go back and correct the circulation loop of the right household on the fourth floor of the second unit due to the adjustment of the diversion four-way.

[0105] The imbalance rate of the circulation loop of the right household on the fourth floor of unit two was 0.04% before correction. The local resistance coefficient of the loop was modified due to the adjustment of the diversion four-way valve. The imbalance rate after modification was 0.79%. The water inlet pressure regulating pipe of the household was re-diametered and pressure-regulated in sections. After several adjustments to the position of the sectioned diameter change, the pressure regulating pipe was reduced in diameter before the elbow. The length of the front section was 0.98m and the nominal diameter was 15mm, and the length of the rear section was 2.32m and the nominal diameter was 12mm. The local resistance coefficient of the part before the diameter change was 9.0, and the local resistance coefficient of the part after the diameter change was 2.5. The adjusted circulation pressure was 12119.25Pa, and the imbalance rate was 0.03%. The adjustment effect was ideal.

[0106] The circulation loop of the right household on the fifth floor of the second unit was adjusted. The circulation pressure of the loop was 9087.02Pa, and the imbalance rate was 25.04%. The adjustment of the loop was to change the entire section of the household's return water pressure regulating pipe from a pipe with a nominal diameter of 20mm to a pipe with a nominal diameter of 15mm, and modify the local resistance coefficient of the pressure regulating pipe after the diameter change accordingly. The adjusted circulation pressure was 9844.52Pa, and the imbalance rate was 18.79%. The adjustment effect was not ideal; the entire section of the household's inlet pressure regulating pipe was changed from a pipe with a nominal diameter of 20mm to a pipe with a nominal diameter of 15mm, and the local resistance coefficient of the branch pipe after the diameter change was modified accordingly. The adjusted circulation pressure was 10828.64Pa, and the imbalance rate was 10.68%. The adjustment effect was not ideal; the return water pressure regulating pipe of the household was continued to be segmented and reduced in diameter. After adjusting the position of the segmented diameter change several times, the pressure regulating pipe was reduced in diameter after the elbow. The upper section was 1.95m long and 15m in nominal diameter. m, the length of the rear section is 1.00m, the nominal diameter is 12mm, the local resistance coefficient of the part before the pipe section is reduced in diameter is 7.5, the local resistance coefficient of the part after the diameter reduction is 1.0, the adjusted circulating pressure is 11553.03Pa, the imbalance rate is 4.70%, and the adjustment effect is not ideal; continue to carry out segmented diameter reduction and pressure regulation on the water inlet pressure regulating pipe of this household, after adjusting the position of the segmented diameter reduction for many times, the pressure regulating pipe is reduced in diameter after the elbow, the upper section length is 2.30m, the nominal diameter is 15mm, the rear section length is 1.00m, the nominal diameter is 12mm, the local resistance coefficient of the part before the pipe section is reduced in diameter is 11.5, the local resistance coefficient of the part after the diameter reduction is 0.5, the adjusted circulating pressure is 12131.81Pa, the imbalance rate is -0.07%, and the adjustment effect is relatively ideal.

[0107] The circulation loop of the left household on the fifth floor of Unit 2 was adjusted. The circulation pressure of the loop was 8437.01Pa, and the imbalance rate was 30.40%. The adjustment of the loop was to change the entire section of the household's return water pressure regulating pipe from a pipe with a nominal diameter of 20mm to a pipe with a nominal diameter of 15mm, and modify the local resistance coefficient of the pressure regulating pipe after the diameter change accordingly. The adjusted circulation pressure was 9203.82Pa, and the imbalance rate was 24.08%. The adjustment effect was not ideal; the entire section of the household's inlet water pressure regulating pipe was changed from a pipe with a nominal diameter of 20mm to a pipe with a nominal diameter of 15mm, and the local resistance coefficient of the branch pipe after the diameter change was modified accordingly. The adjusted circulation pressure was 9872.23Pa, and the imbalance rate was 24.08%. The balance rate is 18.56%. At the same time, the diversion four-way on the fifth floor of the second unit is replaced from DN40X20 to DN40X15. The adjusted circulation pressure is 9796.72Pa, and the imbalance rate is 19.19%. The adjustment effect is not ideal; continue to change the entire section of the household water inlet pressure regulating pipe from a pipe with a nominal diameter of 15mm to a pipe with a nominal diameter of 12mm, and modify the local resistance coefficient of the branch pipe after the diameter change accordingly. The adjusted circulation pressure is 12059.39Pa, and the imbalance rate is 0.52%. The adjustment effect is relatively ideal. Go back and correct the circulation loop of the right household on the fifth floor of the second unit due to the adjustment of the diversion four-way.

[0108] The imbalance rate of the circulation loop of the right household on the fifth floor of unit two before correction was -0.07%. The local resistance coefficient of the loop was modified due to the adjustment of the diversion four-way valve. The imbalance rate after modification was 0.67%. The water inlet pressure regulating pipe of the household was re-divided and pressure-regulated in sections. After several adjustments to the position of the sectioned diameter change, the pressure regulating pipe was reduced from below the elbow. The length of the upper section was 2.25m and the nominal diameter was 15mm, and the length of the lower section was 1.05m and the nominal diameter was 12mm. The local resistance coefficient of the part before the diameter change was 11.0, and the local resistance coefficient of the part after the diameter change was 0.5. The adjusted circulation pressure was 12122.70Pa, the imbalance rate was 0.00%, and the adjustment effect was ideal.

[0109] The circulation loop of the right household on the sixth floor of the second unit was adjusted. The circulation pressure of the loop was 11433.28Pa, and the imbalance rate was 5.69%. The adjustment of the loop was to adjust the return water pressure regulating pipe of the household in sections. After adjusting the position of the section diameter change several times, the pressure regulating pipe was changed from below the elbow. The length of the front section was 1.00m, the nominal diameter was 20mm, the length of the lower section was 1.65m, the nominal diameter was 15mm, the local resistance coefficient of the part before the diameter change was 6.5, and the local resistance coefficient of the part after the diameter change was 1.0. The adjusted circulation pressure was 12065.31Pa, the imbalance rate was 0.48%, and the adjustment effect was relatively ideal.

[0110] The circulation loop of the left household on the sixth floor of Unit 2 was adjusted. The circulation pressure of the loop was 9721.18Pa, and the imbalance rate was 19.81%. The adjustment of the loop was to change the entire section of the household's return water pressure regulating pipe from a pipe with a nominal diameter of 25mm to a pipe with a nominal diameter of 20mm, and modify the local resistance coefficient of the pressure regulating pipe after the diameter change accordingly. The adjusted circulation pressure was 10116.93Pa, and the imbalance rate was 16.55%. The adjustment effect was not ideal; the entire section of the household's water inlet pressure regulating pipe was changed from a pipe with a nominal diameter of 25mm to a pipe with a nominal diameter of 20mm, and the local resistance coefficient of the branch pipe after the diameter change was modified accordingly. The adjusted circulation pressure was 10484.52Pa, and the imbalance rate was 16.55%. The balance rate is 13.51%. At the same time, the diversion spool on the sixth floor of the second unit is replaced from DN32X25 to DN32X20. The adjusted circulation pressure is 10422.49Pa, and the imbalance rate is 14.03%. The adjustment effect is not ideal; the entire section of the household water inlet pressure regulating pipe is changed from a pipe with a nominal diameter of 20mm to a pipe with a nominal diameter of 15mm, and the local resistance coefficient of the branch pipe after the diameter change is modified accordingly. The adjusted circulation pressure is 12072.91Pa, and the imbalance rate is 0.41%. The adjustment effect is relatively ideal. Go back and correct the circulation loop of the right household on the sixth floor of the second unit due to the adjustment of the diversion spool.

[0111] The imbalance rate of the circulation loop of the right household on the sixth floor of the second unit before correction was 0.48%. The local resistance coefficient of the loop was modified due to the adjustment of the diversion four-way. The imbalance rate after modification was 0.99%. The return water pressure regulating pipe of the household was re-adjusted by segmented diameter reduction. After multiple adjustments to the position of the segmented diameter reduction, the pressure regulating pipe was reduced from below the elbow. The length of the front section was 1.65m, the nominal diameter was 20mm, the length of the rear section was 1.00m, the nominal diameter was 15mm, the local resistance coefficient of the part before the diameter reduction was 5.5, and the local resistance coefficient of the part after the diameter reduction was 1.0. The adjusted circulation The pressure is 11808.60Pa, and the imbalance rate is 2.59%. The adjustment effect is not ideal; continue to perform segmented diameter reduction and pressure regulation on the water inlet pressure regulating pipe of this household. After adjusting the position of the segmented diameter reduction for many times, the pressure regulating pipe is reduced in diameter from under the elbow. The length of the upper section is 2.20m, and the nominal diameter is 20mm. The length of the lower section is 0.80m, and the nominal diameter is 15mm. The local resistance coefficient of the part before the diameter reduction of the pipe section is 9.0, and the local resistance coefficient of the part after the diameter reduction is 0.5. The adjusted circulating pressure is 12117.04Pa, and the imbalance rate is 0.05%. The adjustment effect is relatively ideal.

[0112] The adjustment method of the circulation loop of each household in a unit is to adjust the imbalance rate layer by layer from one layer to the top according to the above steps, so that the imbalance rate of the circulation loop of each household is controlled at about ±1%.

[0113] The present invention increases unit risers, and forms a pressure regulating pipe with the unit riser and the household connecting branch pipe. By adjusting the diameter of the pressure regulating pipe, or designing the pressure regulating pipe corresponding to each household with a variable diameter, the purpose of water flow distribution can be achieved. The hydraulic balance design of each household's heating system can be ideal, and the temperature imbalance between households can be solved, the temperature difference of the indoor imbalance of the building can be reduced, and the situation of low temperature difference and large flow operation can be changed.

[0114] After testing, it was found that this method can be used to control the indoor temperature difference within the standard of 18±2℃; it can control the operating temperature difference of the low-temperature hot water floor radiant heating system to around 10℃ or more as required by the standard. This can reduce the circulation flow of the system, and use a small-flow, low-lift circulating water pump instead, reducing the electricity expenditure of the circulating water pump, which can achieve significant social and economic benefits.

[0115] In this specification, each embodiment is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be referred to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part.

[0116] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A design method for a low-temperature hot water floor radiant heating system, characterized in that: The following steps are involved: S1. Calculate the heat load in each room according to the code and the building envelope; S2. Determine the number of circuits of the manifold and water collector; S3. Determine the laying spacing and area of ​​the heat dissipation coils according to the room area and heat load; S4. Calculate the total resistance of water circulation in each household; S5. Hydraulic balance design of unit risers: connect the unit risers to each household’s incoming branch pipes as pressure regulating pipes for flow distribution between households. By adjusting the diameters of the unit risers and the incoming branch pipes, the circulating flow of water in each household can reach the designed value.

2. A low-temperature hot water floor radiant heating system design method according to claim 1, characterized in that: The heat dissipation coil adopts PE-X plastic pipe; the unit riser adopts steel pipe.

3. A low-temperature hot water floor radiant heating system design method according to claim 1, characterized in that: In step S2, the number of circuits of the distribution and collection water tanks is determined according to the total length of the heat dissipation coils laid in each household.

4. A low-temperature hot water floor radiant heating system design method according to claim 3, characterized in that: In step S3, the heat dissipation coils of each household are numbered and the length of each heat dissipation coil and the number of 90° elbows are counted. The circulation resistance of the heat dissipation coils in multiple circuits of the branch and collector are calculated. The length of the branch heat dissipation coils is adjusted to control the imbalance rate of each heat dissipation coil within ±1%.

5. A low-temperature hot water floor radiant heating system design method according to claim 3, characterized in that: In step S3, when the laying spacing of the heat dissipation coils is 100 mm and the total area of ​​the heat dissipation coils laid in the room does not exceed 10% of the room area, the heat dissipation coils are laid at a spacing of 100 mm over the entire area; when the total area of ​​the heat dissipation coils laid in the room exceeds 10% of the room area, the supply and return water temperatures are increased, and the spacing and area of ​​the heat dissipation coils laid in each room are redesigned according to the increased temperature, and a primary heat dissipation coil plan layout is drawn according to the laying conditions of the heat dissipation coils in each room of each household.

6. A method for designing a low-temperature hot water floor radiant heating system according to claim 5, characterized in that: The primary heat dissipation coil plan layout is modified according to the length of the branch heat dissipation coil adjusted in step S3.

7. A method for designing a low-temperature hot water floor radiant heating system according to claim 6, characterized in that: In step S4, the total circulation resistance of the water of each household is calculated according to the total heat load of each household, the adjusted length of each branch coil of the household, and the heat load shared by each heat dissipation coil.

8. A method for designing a low-temperature hot water floor radiant heating system according to claim 7, characterized in that: In step S5, the circulation flow is distributed by adjusting the diameters of the unit riser and the household connection branch pipes so that the circulation flow of each household reaches the designed value.

9. A method for designing a low-temperature hot water floor radiant heating system according to claim 8, characterized in that: Steel pipes below DN15 can be used for unit risers and household connecting branches.

10. A method for designing a low-temperature hot water floor radiant heating system according to claim 1, characterized in that: In step S5, the unit riser or household connection branch pipe may be divided into multiple sections of pipes with different diameters, and the lengths of the pipes with different diameters may be adjusted to meet the design requirements.

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