Ground Source Heat Pump Design Site Construction Of The Key Issues
HC HVAC & R Network
HC HVAC & R Network
Site visit:
Decided Ground Source Heat Pump System after the site visit, in addition to the investigation conducted outside the venue, the key is to drill exploration holes collecting soil thermal parameters. Soil thermal parameters include the thermal conductivity of soil, soil temperature and with depth and seasonal changes in the law, at present, because the domestic lack of research in this area, the relevant technology is not mature, thus limiting the land source Heat Pump Application and development.
System design:
Ground-source heat Pump Heat exchanger In Heating Heating Net cycle heat transfer medium between the earth and quite complex, the main difficulty of the system design is the design of heat exchangers. Buried form, pipe or shaft of the pitch, depth, diameter, flow rate of circulating medium is the system should focus on the design and construction of heating network considering the result of heating elements.
Key points:
Buried sub-layer and multi-level, of which the best depth of buried single level of 0.8 ~ 1.0m, with climate change and greater heat transfer effect, while the multi-layer tube in the lower tube in the lower temperature field, effect of heat transfer better than the single, but it may cost more. Is more commonly used double pipes, the best depth of 1.2 ~ 1.9m. No matter what type of pipe must be buried below the depth of frozen ground.
Key points:
U-tube heat exchanger in the 50mm diameter generally less than the depth up to 200m, mainly for smaller areas buried. U-tube and the distance between any information that is generally 4.5m, is now also an instance of 6m, in fact, the spacing should be buried deep, loop form, diameter, and system use condition.
Key points:
Tube heat exchanger outer tube diameters up to 200mm, as increased heat transfer area to reduce the number and depth of the hole, but the heat loss caused between the inside and outside the chamber.
Key points:
Single tube in a foreign country known as the "hot wells", which can reduce installation costs and operating expenses, but no less than the outer tube, by the hydrogeological conditions too restrictive.
System Installation:
Vertical buried construction include drilling, heat exchanger installation, test pressure and filling, any one of these steps are critical, therefore, should be qualified and experienced construction team to complete.
Ground source heat pump system technology design of the key issues of site construction
Steps are as follows:
1, drilling (1) The machine should be dedicated staff to conduct geological geological record, including lithologic description, well depth, water table, mud consumption. (2) as well, the conduct geophysical logging, and ground temperature measurements;
2, heat exchanger installed immediately after drilling down tube, and to take measures to prevent the floating of fixed;
3, before the pressure test must be carried out in the backfill pressure test to ensure no leakage;
4, backfill backfill materials are not allowed to have a large size of the particles, the slow filling process must be conducted to ensure the adequacy, reducing the thermal resistance;
Level of construction, including trenching buried, down tube, test pressure and filling, which filling is the key. In the backfill process should be laid around the coil of each 50-100mm thick sand, so tight integration between the pipeline and the earth and improve heat transfer.
Related Reading:
Ground Source Heat Pump Principles and characteristics of ground source heat pump technology
Ground Source Heat Pump Project obvious energy-saving demonstration project
First ground source heat pump central air conditioning system using Riverside Building
Ground Source Heat Pump Design Site Construction Of The Key Issues
By: dshfj
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