Ground source heat pump system principle and design

1 ground source heat pump system works Ground source heat pump is the use of water source heat pump in a form, it is the use of water and ground energy (groundwater, soil or surface water) for cold and heat exchange as a source of heat pump cold source, the winter to the ground In the heat can "take" out, to supply indoor heating, at this time for the "heat source"; summer to take out indoor heat, released into the groundwater, soil or surface water, at this time can be "cold source." Ground Source Heat Pump System Design Example 1 Project Overview Nanjing a total of three villas, construction area of ​​350m2, 1 floor by the living room, guest rooms, dining room, kitchen, laundry, bathroom composition, two layers from the parents room, children's room, children's playroom Study, living room and multi-function room composed of three floors by the study, the master bedroom, the main guard and other components. 2 Main Design Parameters 2.1 Outdoor Design Parameters Summer winter atmospheric pressure; 1004.0 hPa Summer outdoor dry-bulb temperature 35.0 ℃ Summer wet-bulb temperature 28.3 ℃ Daily average temperature 31.4 ℃ Daily average poor 6.9 ℃ atmospheric pressure; 1025.2 hPa Winter outdoor air-conditioning calculation temperature -6 ℃ Calculation of relative humidity 73% Maximum permafrost depth 9cm Average wind speed 2.6 m / s Average wind speed 2.6 m / s 2.2 Indoor Design Parameters Room Function Summer Winter Temperature 〔℃〕 Humidity 〔%〕 Temperature 〔℃〕 Humidity 〔%〕 Bedroom, guest room, Study, living room-22> 40 living room, dining room, aisle-20> 40 Note: fresh air system owners commissioned a professional unit design 3 System Design According to the actual situation and the owners, the project uses ground source heat pump Central Air-conditioning system, the unit uses WFI VKC water - water unit, the indoor end with horizontal concealed fan coil, the use of air to send side delivery. Due to outdoor space constraints, underground heat exchangers use two vertical pipe heat exchange systems, and the surrounding green belt can be used to make ground-coupling holes. Each hole is provided with a pair of U-shaped ground coupling pipes. Cooling to the soil in summer, winter heat from the soil, the use of natural renewable energy, the system is stable, does not consume groundwater, will not cause pollution.