Drilling design rules for groundwater source ground source heat pump and ground pipe ground source heat pump
Time:2019-03-26 15:28:00 Read:1176 Time Source: daishiba group
Drilling design rules for groundwater source ground source heat pump and ground pipe ground source heat pump
Ground source
The wellhead is more than 4 meters apart and is buried by DN32 pipe. The U-shaped EP well is 60-180 meters deep and the wellhead diameter is 160-200 mm.
Water source
With a spacing of more than 15 meters, the large diameter single pipe is used. The material EP is 60 to 150 meters deep and the wellhead is 400 mm. According to the geological conditions, each well is equipped with 2 ~ 15 recirculation wells.
The difference between water source heat pump and ground source heat pump
Geological features can be obtained from the relevant departments, or you can play a research well first.
For example: If the cooling capacity is 1200kW:
✓ Ground source heat pump: It requires a buried well of 180, 100m depth, using DN32, PE, U double tube.
✓ Water source Heat pump: Requires 3, 60 ~ 150m (according to the groundwater level, the national regulations do not allow more than 150m) water supply wells, each supply well requires 3 ~ 15 recharge wells (depending on geological structure).
The difference between water source heat pump and ground source heat pump
Drilling needs attention
It is best to do thermal response experiments by experimenting with wells and to obtain more accurate data through professional software calculations.
1. According to the hydrogeological survey report and the water resources demonstration report made by the test well, the water output (related to the thickness of the aquifer and the size of the wellhead) is also required.
2. Calculate the cooling and heating load according to the area of heating or cooling to be determined, determine the model and quantity of the water source heat pump unit and the water demand;
3. Consider the location of the well location and the climate impact. (For example, there are river dams nearby, the length of the rainy season has an impact.) First, calculate the heat according to the load, absorb heat. In the thermal response test, if the test is unconditional, you can follow Experience estimation ~ buried pipe split U U double U-sleeve and other forms, generally custom products, not much on the construction site, not economical, so there is no problem of bottom hole connection.
4, if you do geothermal heat pump, you must do geological exploration, understand the underground soil temperature, generally the cost of ground source heat pump is much higher than the cost of water source heat pump. If you use water source heat pump, you can see that the water in each well of the project can reach How many tons per hour, but the water source heat pump has to consider the recharge problem. The water source heat pump recharge problem is the premise of the good operation of the water source heat pump. If the spare well is used, the problem of recharge is considered. If the water is discharged per well, it is 200 tons per hour but back. If the filling pressure is too large, 200 tons of water can be recharged. Generally, the water is collected from 2 wells or 3 wells. The ground source heat pump closed system does not affect water and water. It is circulating in the buried pipe, not outside; the soil layer does not seem to have any major influence at present; the drawbacks are ah, the cost is expensive.
What are the differences between ground source heat pumps and water source heat pumps?
The difference between water source heat pump and ground source heat pump
Definition on
The ground source heat pump and the water source heat pump are conceptually mainly for the system, that is, the ground source heat pump system and the water source heat pump system, rather than the host. Many people have misunderstandings in this respect. In other words, the ground source heat pump host It is the same host as the water source heat pump main unit. And we usually say that the ground source water source water source source water source source water source source source source water source.
If it is a ground source heat pump, then its water source comes from the closed loop of the underground buried pipe, and the water on the source water side exchanges heat with the underground through the underground buried pipe without material exchange. This is what we usually call Ground source heat pump, the representation method in Europe and America is -geothermal heatpump.
The water source heat pump is different from the ground source heat pump. The source water side water source is directly taken from ground water or river water or sea water. It is an open type, and the water is directly taken to take heat or heat and is discharged back to the original water intake point as required. Just use the energy in the water of nature, this form is called the water source heat pump.
The difference between water source heat pump and ground source heat pump
The difference between simple understanding:
1: The ground source heat pump is outdoor punched, and the footprint is larger than the water source heat pump.
2: The water source heat pump is an outdoor water pump, but now the government has more complicated approval for well drilling. (The water source heat pump needs to be drilled, usually requires the approval of the Water Authority) and the ground source heat pump country does not need relevant approval procedures.
3 Ground source heat pump is higher than the outdoor heat pump
All shallow low temperature energy heat pumps are collectively referred to as: Ground Source Heat Pump
Ground source heat pumps are divided into open systems and closed systems.
The ground source heat pump you are talking about should be the source of the soil.
The difference between "ground source" and "water source" is mainly due to different media, and different design and construction methods.
The ground source heat pump is also a kind of closed system , which is mainly used to connect the underground pipe around the building , and the flow medium in the closed pipe completes the heat exchange with the interior of the building .
A water source heat pump is a type of open system in which groundwater or surface water is extracted by heat exchangers.
The ground source heat pump uses the buried pipe to collect the heat in the soil. The heat pump uses the groundwater to collect the heat in the water body. The principle is similar. The actual design temperature, the brine and the valve components are different. Because the groundwater temperature is high, it can be directly used as the cold storage. The underground water temperature of the buried pipe is low, and often it may be lower than zero. Therefore, the ethylene glycol solution is often used as the brine. The ethylene glycol concentration depends on the minimum water temperature. The principle is the same, the way of taking the heat source is different.
The water source heat pump is to drill the well directly to take groundwater for heat exchange or cold change;
The ground source heat pump is to embed a lot of pipes in the underground, and then fill the pipes with water or antifreeze as a change.
1. A heat medium that absorbs underground heat or cold through a medium circulating in a pipe.
The difference between water source heat pump and ground source heat pump
Other differences:
The ground source heat pump is a closed underground system. The water source is the underground pumping system. The water source is restricted by the government, and the groundwater source is long-term stable. The ground source is relatively stable. The connection is that they are all the same. (Hot) principle, but the medium used is different.
Ground source heat pump including ground source heat pump and water source heat pump water source heat pump including surface water and groundwater source heat pump
Simply put, the ground source heat pump is the temperature for extracting the underground soil source. The water source heat pump is the temperature for extracting the groundwater, and then through the group machine to achieve heating or cooling. The ground source heat pump is much more expensive than the small source heat pump, so generally only one area of groundwater If you are rich, you will use a water source heat pump.
The difference between water source heat pump and ground source heat pump
Simple figure comparison
The difference between water source heat pump and ground source heat pump
The difference between water source heat pump and ground source heat pump
Advantages of ground source heat pump:
The working principle of the ground source heat pump central air conditioner is to make full use of the characteristics of the soil and water resources under the surface with constant temperature and large compensation. It has created an excellent working condition for the air conditioning unit. During the refrigeration process, the unit will have air conditioning space. The heat is replaced and brought into the ground and absorbed by the soil or water source. When heating, the unit converts the heat energy in the underground soil into the space for heating; because the underground soil is large and the selected temperature is suitable, the unit The work efficiency is greatly improved; the COP (energy efficiency ratio) value is more than 3.8 when heating, and when it is cooling, it is as high as 5.2 or more. Compared with the common central air conditioner, the energy saving is 30% -50%, thus achieving high efficiency. The effect of energy saving; the unit has low noise during operation, does not consume water, does not produce any waste and pollutants, and has obvious environmental protection effect; The unit is easy to install, and the small space is small to eliminate the outdoor cooling tower, so that the maintenance amount is very small, the investment cost Greatly reduced, it is the most economical air conditioner today. Surgery.
Water source air conditioning can be used for surface water, such as lakes, rivers, etc.
Ground source
The wellhead is more than 4 meters apart and is buried by DN32 pipe. The U-shaped EP well is 60-180 meters deep and the wellhead diameter is 160-200 mm.
Water source
With a spacing of more than 15 meters, the large diameter single pipe is used. The material EP is 60 to 150 meters deep and the wellhead is 400 mm. According to the geological conditions, each well is equipped with 2 ~ 15 recirculation wells.
The difference between water source heat pump and ground source heat pump
Geological features can be obtained from the relevant departments, or you can play a research well first.
For example: If the cooling capacity is 1200kW:
✓ Ground source heat pump: It requires a buried well of 180, 100m depth, using DN32, PE, U double tube.
✓ Water source Heat pump: Requires 3, 60 ~ 150m (according to the groundwater level, the national regulations do not allow more than 150m) water supply wells, each supply well requires 3 ~ 15 recharge wells (depending on geological structure).
The difference between water source heat pump and ground source heat pump
Drilling needs attention
It is best to do thermal response experiments by experimenting with wells and to obtain more accurate data through professional software calculations.
1. According to the hydrogeological survey report and the water resources demonstration report made by the test well, the water output (related to the thickness of the aquifer and the size of the wellhead) is also required.
2. Calculate the cooling and heating load according to the area of heating or cooling to be determined, determine the model and quantity of the water source heat pump unit and the water demand;
3. Consider the location of the well location and the climate impact. (For example, there are river dams nearby, the length of the rainy season has an impact.) First, calculate the heat according to the load, absorb heat. In the thermal response test, if the test is unconditional, you can follow Experience estimation ~ buried pipe split U U double U-sleeve and other forms, generally custom products, not much on the construction site, not economical, so there is no problem of bottom hole connection.
4, if you do geothermal heat pump, you must do geological exploration, understand the underground soil temperature, generally the cost of ground source heat pump is much higher than the cost of water source heat pump. If you use water source heat pump, you can see that the water in each well of the project can reach How many tons per hour, but the water source heat pump has to consider the recharge problem. The water source heat pump recharge problem is the premise of the good operation of the water source heat pump. If the spare well is used, the problem of recharge is considered. If the water is discharged per well, it is 200 tons per hour but back. If the filling pressure is too large, 200 tons of water can be recharged. Generally, the water is collected from 2 wells or 3 wells. The ground source heat pump closed system does not affect water and water. It is circulating in the buried pipe, not outside; the soil layer does not seem to have any major influence at present; the drawbacks are ah, the cost is expensive.
What are the differences between ground source heat pumps and water source heat pumps?
The difference between water source heat pump and ground source heat pump
Definition on
The ground source heat pump and the water source heat pump are conceptually mainly for the system, that is, the ground source heat pump system and the water source heat pump system, rather than the host. Many people have misunderstandings in this respect. In other words, the ground source heat pump host It is the same host as the water source heat pump main unit. And we usually say that the ground source water source water source source water source source water source source source source water source.
If it is a ground source heat pump, then its water source comes from the closed loop of the underground buried pipe, and the water on the source water side exchanges heat with the underground through the underground buried pipe without material exchange. This is what we usually call Ground source heat pump, the representation method in Europe and America is -geothermal heatpump.
The water source heat pump is different from the ground source heat pump. The source water side water source is directly taken from ground water or river water or sea water. It is an open type, and the water is directly taken to take heat or heat and is discharged back to the original water intake point as required. Just use the energy in the water of nature, this form is called the water source heat pump.
The difference between water source heat pump and ground source heat pump
The difference between simple understanding:
1: The ground source heat pump is outdoor punched, and the footprint is larger than the water source heat pump.
2: The water source heat pump is an outdoor water pump, but now the government has more complicated approval for well drilling. (The water source heat pump needs to be drilled, usually requires the approval of the Water Authority) and the ground source heat pump country does not need relevant approval procedures.
3 Ground source heat pump is higher than the outdoor heat pump
All shallow low temperature energy heat pumps are collectively referred to as: Ground Source Heat Pump
Ground source heat pumps are divided into open systems and closed systems.
The ground source heat pump you are talking about should be the source of the soil.
The difference between "ground source" and "water source" is mainly due to different media, and different design and construction methods.
The ground source heat pump is also a kind of closed system , which is mainly used to connect the underground pipe around the building , and the flow medium in the closed pipe completes the heat exchange with the interior of the building .
A water source heat pump is a type of open system in which groundwater or surface water is extracted by heat exchangers.
The ground source heat pump uses the buried pipe to collect the heat in the soil. The heat pump uses the groundwater to collect the heat in the water body. The principle is similar. The actual design temperature, the brine and the valve components are different. Because the groundwater temperature is high, it can be directly used as the cold storage. The underground water temperature of the buried pipe is low, and often it may be lower than zero. Therefore, the ethylene glycol solution is often used as the brine. The ethylene glycol concentration depends on the minimum water temperature. The principle is the same, the way of taking the heat source is different.
The water source heat pump is to drill the well directly to take groundwater for heat exchange or cold change;
The ground source heat pump is to embed a lot of pipes in the underground, and then fill the pipes with water or antifreeze as a change.
1. A heat medium that absorbs underground heat or cold through a medium circulating in a pipe.
The difference between water source heat pump and ground source heat pump
Other differences:
The ground source heat pump is a closed underground system. The water source is the underground pumping system. The water source is restricted by the government, and the groundwater source is long-term stable. The ground source is relatively stable. The connection is that they are all the same. (Hot) principle, but the medium used is different.
Ground source heat pump including ground source heat pump and water source heat pump water source heat pump including surface water and groundwater source heat pump
Simply put, the ground source heat pump is the temperature for extracting the underground soil source. The water source heat pump is the temperature for extracting the groundwater, and then through the group machine to achieve heating or cooling. The ground source heat pump is much more expensive than the small source heat pump, so generally only one area of groundwater If you are rich, you will use a water source heat pump.
The difference between water source heat pump and ground source heat pump
Simple figure comparison
The difference between water source heat pump and ground source heat pump
The difference between water source heat pump and ground source heat pump
Advantages of ground source heat pump:
The working principle of the ground source heat pump central air conditioner is to make full use of the characteristics of the soil and water resources under the surface with constant temperature and large compensation. It has created an excellent working condition for the air conditioning unit. During the refrigeration process, the unit will have air conditioning space. The heat is replaced and brought into the ground and absorbed by the soil or water source. When heating, the unit converts the heat energy in the underground soil into the space for heating; because the underground soil is large and the selected temperature is suitable, the unit The work efficiency is greatly improved; the COP (energy efficiency ratio) value is more than 3.8 when heating, and when it is cooling, it is as high as 5.2 or more. Compared with the common central air conditioner, the energy saving is 30% -50%, thus achieving high efficiency. The effect of energy saving; the unit has low noise during operation, does not consume water, does not produce any waste and pollutants, and has obvious environmental protection effect; The unit is easy to install, and the small space is small to eliminate the outdoor cooling tower, so that the maintenance amount is very small, the investment cost Greatly reduced, it is the most economical air conditioner today. Surgery.
Water source air conditioning can be used for surface water, such as lakes, rivers, etc.
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