CN-122021069-A - Ground source heat pump buried pipe system design method based on building load change

CN122021069ACN 122021069 ACN122021069 ACN 122021069ACN-122021069-A

Abstract

The invention relates to the technical field of ground source heat pumps, and particularly discloses a ground source heat pump buried pipe system design method based on building load change, which comprises the steps of obtaining dynamic load data of a building time by time all the year around, and calculating a cold and hot load imbalance proportion to judge a heat imbalance risk; the method comprises the steps of inputting dynamic load data into a three-dimensional heat transfer numerical calculation model of a buried pipe group, simulating and analyzing a rock-soil body temperature field evolution rule in a design operation period, analyzing a rock-soil body temperature change trend and accumulated net heat obtaining quantity based on a simulation result, dividing a rock-soil body area into a cold accumulation area, a hot accumulation area and a heat balance area, correspondingly arranging heat supplementing, radiating and heat exchanging units in each partition area, and formulating a multi-mode collaborative starting operation strategy. The invention solves the problems that the traditional design can not simulate long-term heat unbalance and has poor system adaptability, realizes the prejudgment and partition of the rock-soil thermal field, and improves the long-term stability and the robustness of the system through internal heat scheduling.

Inventors

LI CHAO
ZHU JUN
ZHU HUA
WEI QINGSONG

Assignees

吉林省碧蓝新能源科技股份有限公司

Dates

Publication Date: 20260512
Application Date: 20260410

Claims (10)

1. The design method of the ground source heat pump buried pipe system based on the building load change is characterized by comprising the following steps: S1, acquiring dynamic load data of the building year by year, counting intensity-frequency distribution of cold and heat loads, calculating unbalanced proportion of the cold and heat loads, judging whether heat unbalance risks exist according to the dynamic load data, executing S2 if the heat unbalance risks exist, and otherwise, terminating a design flow; s2, taking the dynamic load data acquired in the S1 as input conditions, importing a pre-built three-dimensional heat transfer numerical calculation model of the buried pipe group, simulating and analyzing an evolution rule of a rock-soil mass temperature field around the buried pipe group in a designed operation period, and generating a rock-soil body temperature change cloud picture; S3, determining a heat unbalance occurrence position according to the simulation result of the S2 through a temperature change trend, judging the heat unbalance type as cold accumulation or heat accumulation by combining the accumulated net heat, and dividing the rock-soil body area into a cold accumulation area, a heat accumulation area and a heat balance area; S4, correspondingly arranging a heat supplementing unit, a heat radiating unit and a heat exchanging unit in the cold accumulation area, the hot accumulation area and the boundary area of the cold accumulation area, and formulating starting and running strategies of each heat regulating unit.
2. The method for designing the ground source heat pump buried pipe system based on the construction load change according to claim 1, wherein the method for calculating the unbalanced proportion of the cold and hot loads comprises the following steps: S111, acquiring building thermal parameters and basic data required by energy consumption simulation, constructing a dynamic load simulation model reflecting building operation characteristics by using energy consumption simulation software, and generating an annual dynamic load spectrum curve with hour as time granularity; S112, carrying out Fourier transform on the annual dynamic load spectrum curve, analyzing to obtain a plurality of load time periods and accumulated load amounts of cold and hot loads, and obtaining peak load and duration of each load time period; S113, determining the range of the peak load according to the peak load of each load period, and dividing the range into a plurality of continuous load sections; counting the accumulated duration of the cold load time period and the hot load time period in each load interval, inputting the accumulated duration into a preset first unbalance proportion calculation model, and determining a first unbalance proportion of the cold load and the hot load; S114, calculating the ratio of the cold load accumulation amount to the hot load accumulation amount, taking an absolute value after the ratio is differenced from 1, and obtaining a second unbalanced proportion of the cold load and the hot load; And S115, summing the first unbalanced proportion and the second unbalanced proportion to obtain the comprehensive unbalanced proportion of the cold and hot load.
3. The method for designing a ground source heat pump buried pipe system based on building load change according to claim 2, wherein the first imbalance ratio calculation model is as follows: ; Wherein, the A first imbalance ratio is indicated and is indicated, Represent the first The number of the individual load zones is set, , Respectively represent the first The cumulative duration of the cold load period and the hot load period within each load interval, Representing a preset positive number constant close to zero.
4. The method for designing the ground source heat pump buried pipe system based on the building load change according to claim 1, wherein the method for judging whether the thermal unbalance risk exists is as follows: and comparing the comprehensive unbalance proportion of the cold and hot loads with a preset unbalance proportion threshold value, if the threshold value is exceeded, judging that the risk of heat unbalance exists, otherwise, judging that the risk of heat unbalance does not exist.
5. The method for designing the ground source heat pump buried pipe system based on the construction load change according to claim 1, wherein the method for determining the occurrence position of the thermal unbalance is as follows: s311, performing grid discretization on a rock-soil body around the buried pipe group, and dividing the rock-soil body into a plurality of control units for representing space positions; S312, extracting time sequence temperature data of each control unit in different years in the operation period based on a temperature change cloud picture of a rock-soil body in the operation period, and respectively drawing a temperature change curve of each control unit along with time according to the time sequence temperature data; s313, comparing the temperature change curve of each control unit along with time with the initial equilibrium temperature of the rock-soil body: if the temperature change curve shows a unidirectional continuous drift trend and does not have a trend of returning to an initial balance state in the whole operation period, judging that the control unit is subjected to heat unbalance, otherwise, judging that the control unit is not subjected to heat unbalance; S314, counting all the control units judged to be subjected to heat unbalance, performing spatial clustering analysis on the control units, and aggregating the heat unbalance control units in adjacent or spatial position concentration into a plurality of continuously distributed heat unbalance areas.
6. The method for designing a ground source heat pump buried pipe system based on building load change according to claim 5, wherein the method for judging the type of heat imbalance is as follows: S321, respectively calculating accumulated net heat in each heat unbalance area in an operation period, wherein the accumulated net heat is the difference value between the total heat release amount released by the buried pipe system to the rock-soil body and the total heat extraction amount absorbed by the rock-soil body; S322, judging the unbalance type of the corresponding thermal unbalance area according to the positive and negative values of the accumulated net heat: if the accumulated net heat is greater than zero, determining the area as heat accumulation type unbalance; If the accumulated net heat is less than zero, the region is determined to be cold-stacked imbalance.
7. The method for designing the ground source heat pump buried pipe system based on the construction load change according to claim 6, wherein the method for dividing the rock-soil body area is as follows: Determining a thermal imbalance region determined to be cold-stacking imbalance as a cold-stacking region; determining a thermal imbalance region determined to be thermal stack imbalance as a thermal stack region; The remaining area of the rock-soil body area excluding the cold accumulation area and the hot accumulation area is determined as a heat balance area.
8. The method for designing the ground source heat pump buried pipe system based on the building load change of claim 1, wherein the starting and running strategies of the heat regulating unit are as follows: If the hot accumulation area is over-temperature and the cold accumulation area is over-cooled, starting the heat exchange unit and operating a heat transfer mode; If the hot accumulation area is over-temperature and the cold accumulation area is normal, starting a heat dissipation unit and operating a heat dissipation mode; if the cold accumulation area is supercooled and the hot accumulation area is normal, starting the heat supplementing unit and operating the heat supplementing mode.
9. The method for designing the ground source heat pump buried pipe system based on the building load change of claim 1, wherein the method for judging whether the heat accumulation area is over-temperature is as follows: monitoring the temperature of the rock-soil body in the thermal accumulation area in real time, and comparing the temperature with a preset upper limit temperature threshold; If the temperature exceeds the upper temperature threshold, the thermal accumulation area is judged to be in an overtemperature state, otherwise, the thermal accumulation area is judged to be in a normal temperature state.
10. The method for designing the ground source heat pump buried pipe system based on the building load change according to claim 1, wherein the method for judging whether the cold accumulation area is supercooled is as follows: Monitoring the temperature of the rock-soil body in the cold accumulation area in real time, and comparing the temperature with a preset lower limit temperature threshold value; If the temperature of the cooling accumulation area is lower than the lower limit temperature threshold value, the cooling accumulation area is judged to be in a supercooled state, otherwise, the cooling accumulation area is judged to be in a normal temperature state.

Description

Ground source heat pump buried pipe system design method based on building load change Technical Field The invention relates to the technical field of ground source heat pumps, in particular to a ground source heat pump buried pipe system design method based on building load change. Background The ground source heat pump system is used as a high-efficiency and renewable building energy supply technology, and is characterized in that heat exchange is carried out between a ground heat exchanger and a rock-soil body so as to realize heating and refrigerating of a building. In conventional ground source heat pump system designs, the borehole heat exchangers are typically uniformly arranged according to the peak load of the building and the borehole depth, number and spacing are calculated using a fixed empirical formula. When the design method is used for coping with the cold and hot loads of dynamic changes of the building throughout the year, obvious technical limitations and disadvantages exist (1) the thermal unbalance risk is high, and the traditional design method cannot accurately simulate the cumulative influence of the dynamic loads generated by the building in the long-term operation process on the temperature field of the rock and soil body. Particularly in areas with unbalanced cold and hot load accumulation, the system can cause unbalance of heat absorption and heat release of a rock-soil body after long-term operation, so that the temperature of the rock-soil body changes unidirectionally and continuously, and heat accumulation or cold accumulation is generated. The heat unbalance phenomenon can directly lead to the annual attenuation of the running efficiency of the ground source heat pump system, even finally, the failure is caused by too small heat exchange temperature difference, and the long-term stability and the energy-saving effect of the system are severely restricted. (2) The lack of adaptability and adjustment capability the traditional design is a static, disposable input. After the system is built, the heat exchange capacity of the system is cured, and the system cannot cope with future use function change of the building, energy use strength adjustment or load characteristic change caused by extreme weather years. Once the actual operation condition deviates from the design expectation, the system lacks means for actively intervening and adjusting the heat balance, and can not alleviate or eliminate the heat imbalance problem through the self capacity, so that the adaptability is poor. Disclosure of Invention The invention provides a ground source heat pump buried pipe system design method based on building load change, which comprises the following steps of S1, acquiring dynamic load data of a building time by time all the year round, counting intensity-frequency distribution of cold and heat loads, calculating unbalanced proportion of the cold and heat loads, judging whether heat unbalance risks exist according to the dynamic load data, executing S2 if the heat unbalance risks exist, and otherwise terminating a design flow. And S2, taking the dynamic load data acquired in the step S1 as input conditions, importing a pre-constructed three-dimensional heat transfer numerical calculation model of the buried pipe group, simulating and analyzing the evolution rule of a rock-soil mass temperature field around the buried pipe group in a designed operation period, and generating a rock-soil body temperature cloud pattern. And S3, determining a heat unbalance occurrence position according to the simulation result of the step S2 through a temperature change trend, judging the heat unbalance type as cold accumulation or heat accumulation by combining the accumulated net heat, and dividing the rock-soil body area into a cold accumulation area, a heat accumulation area and a heat balance area. And S4, correspondingly arranging a heat supplementing unit, a heat radiating unit and a heat exchanging unit in the cold accumulation area, the hot accumulation area and the boundary area of the cold accumulation area, and formulating starting and running strategies of each heat regulating unit. Compared with the prior art, the design method of the ground source heat pump buried pipe system based on the building load change has the following beneficial effects that 1. The method realizes quantitative evaluation of the heat unbalance risk by acquiring dynamic load data of the building time by time and introducing a calculation method of the comprehensive unbalance proportion of the cold and hot loads, thereby providing scientific basis for subsequent fine design and effectively overcoming the rough problem caused by the fact that the traditional method depends on peak load estimation. 2. According to the invention, by constructing a three-dimensional heat transfer numerical calculation model of the buried pipe group, simulating the evolution rule of a rock-soil body temperature field under a long-term ope