{"id":117756,"date":"2023-08-18T08:20:45","date_gmt":"2023-08-18T06:20:45","guid":{"rendered":"https:\/\/www.velasolaris.com\/handbuch\/ground-water-loops\/"},"modified":"2025-10-20T13:16:14","modified_gmt":"2025-10-20T11:16:14","slug":"ground-water-loops","status":"publish","type":"handbuch","link":"https:\/\/www.velasolaris.com\/en\/handbuch\/polysun-designer\/producers\/geothermal-sources\/ground-water-loops\/","title":{"rendered":"Ground-Water Loops"},"content":{"rendered":"\n

Groundwater Heat Pump Simulation with Polysun<\/h2>\n\n\n\n

Groundwater is a reliable, efficient thermal energy source for heat pumps, offering consistent temperatures year-round for stable heating performance. With Groundwater Heat Pump Simulation, Polysun <\/a>delivers precise modeling, optimizing thermal and hydraulic design for cost-effective, high-efficiency systems.<\/p>\n\n\n\n

Temperature calculation depending on depth<\/h2>\n\n\n\n

The temperature is calculated depending on depth. The following assumptions were made in this respect:<\/p>\n\n\n\n

Soil temperature \u03b8(x,t) depending on depth x (into the soil) and time t varies under the influence of the seasonal course of the outdoor temperature according to the following formula:<\/p>\n\n\n\n

\\(\\theta(x,t) = \\ \\theta_{m} – \\ \\theta_{0} \\cdot exp\\left( – x\\sqrt{\\frac{\\pi}{a \\cdot T}} \\right) \\cdot cos\\left( \\frac{2\\pi}{T}t – x \\cdot \\sqrt{\\frac{\\pi}{a \\cdot T}} \\right)\\)<\/p>\n\n\n\n

Constant groundwater temperature from a depth of 10-15 metres<\/h2>\n\n\n\n

With a ground water depth of about 10-15 m and deeper it can be assumed with good accuracy that the ground water temperature remains constant over the year and  matches the average annual outdoor temperature.<\/p>\n\n\n\n

\n
\"\"
Figure: ground-water loop<\/figcaption><\/figure>\n<\/div>\n\n\n\n

Static Pressure<\/strong><\/h2>\n\n\n\n

Polysun enables users to correctly calculate both static and dynamic pressure. To correctly calculate the required height difference \u2206H a distinction should be made whether or not the loop return line is immersed in the return water tank.  A negative difference is also possible; this will result in the pump being relieved of pressure. The image below illustrates this correlation:<\/p>\n\n\n\n

\n
\"\"
Figure: schema of the ground-water loop<\/figcaption><\/figure>\n<\/div>\n","protected":false},"author":19748,"featured_media":0,"parent":138459,"menu_order":5,"comment_status":"closed","ping_status":"closed","template":"","class_list":["post-117756","handbuch","type-handbuch","status-publish","hentry"],"acf":[],"yoast_head":"\nGroundwater Heat Pump Simulation in Polysun<\/title>\n<meta name=\"description\" content=\"Simulate groundwater heat pumps in Polysun for efficient heating and cooling. 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