Smart agricultural greenhouse constant temperature project in Wangcheng District, Changsha, Hunan
Our country has always attached great importance to the development of agricultural modernization, and various parts of the country have introduced favorable policies to support agricultural development, including greenhouse cultivation with constant temperature. Greenhouse planting is a relatively common agricultural technology, and it is very popular because it can grow crops out of season. Agricultural greenhouses have high requirements for constant temperature. Air source heat pump constant temperature not only meets the government's environmental protection requirements, but also realizes intelligent control. The large-scale constant temperature of greenhouses is also an inevitable trend in the development of modern agriculture.
It is understood that the person in charge of a smart agricultural greenhouse constant temperature project in Changsha, Hunan, learned through an interview that
air source heat pumpsperform well in greenhouse constant temperature cultivation. Not only can they operate stably under low temperature conditions, but labor costs and heating
costs are also greatly reduced. After on-site inspection and multiple comparisons, Fang finally chose Airosd heat pump to design an air source heat pump constant temperature solution
for his new shed of 15,000 square meters.This project uses 15 Airosd air-energy air-cooled heat pump hot and cold water units. Using air source heat pumps as heat sources,
it can intelligently regulate different crops to appropriate temperatures, providing stable and reliable temperature support for constant-temperature greenhouses to provide
heating in winter and cooling in summer. .Fruit tomatoes are currently being planted in the greenhouse. According to the person in charge, the use of the hvac system with
heat pump is not only environmentally friendly and pollution-free, and there is no need to worry about bad weather affecting the planting, but it can also make the planting environment
suitable for temperature and humidity, creating a better environment forthe cherry tomatoes. The high-quality growing environment reduces weed damage, ensures the quality of
small tomatoes, and increases the yield by 30%. The taste is sweeter and juicier than before.
The AIROSD intelligent agricultural greenhouse project in Wangcheng District, Changsha, Hunan, applied the Central Heat And Air Heat Pump to achieve year-round precise temperature
control across a 15,000 m² greenhouse complex. The Central Heat And Air Heat Pump, an advanced hvac system with heat pump capability that integrates both ground-source and air-source modes, successfully addressed the challenges that subtropical seasonal extremes pose to high-value crop production. The hvac system with heat pump uses heat pump for space heating and
cooling technology to keep the greenhouse environment within the optimal crop growth range of 18–26°C.
System architecture & technological innovations
The project adopts a multi-layered temperature control design:
Soil layer — ground heating: A PE-RT piping network was installed 40 cm below the soil surface, circulating 35°C low-temperature hot water supplied by the Central Heat And Air Heat Pump. This ground heating keeps the root zone temperature steady at 20 ± 1°C, significantly improving nutrient uptake.
Canopy zone: Distributed heat pump for space heating and cooling units were installed, using ceiling air diffusers to provide three-dimensional airflow. When internal temperatures exceed 28°C in summer, the hvac system with heat pump automatically switches to cooling mode, lowering temperature by 5°C within 15 minutes.
Environmental control layer: The hvac and heat pump system is linked to an AI decision-making platform and over 200 temperature and humidity sensors to optimize energy use in real time. The hvac and heat pump solution also features heat recovery that converts waste heat from lighting into an auxiliary heat source for the heat pump for space heating and cooling.
Key equipment deployment
For equipment selection, the project adopted a modular hvac system with heat pump approach: six 200 kW Central Heat And Air Heat Pump main units were installed. The Central Heat And Air Heat Pump uses R32 refrigerant and is supported by a ground heat bank made of 120 vertical boreholes (100 m deep). Thirty-six ceiling-mounted heat pump for space heating and cooling terminals were deployed, each with corrosion-resistant fins, intelligent dehumidification modules, and CO₂-linked integrated controls as part of the hvac and heat pump system.
Operational performance & results
Winter operation data show that under an outdoor ambient of −3°C:
The Central Heat And Air Heat Pump achieved a COP of 3.8, saving 67% energy compared with conventional electric heating.
Ground heating limited soil temperature fluctuations to within 0.5°C.
The hvac system with heat pump reduced total energy consumption by the equivalent of 52 tonnes of standard coal per month compared with fuel-oil boilers.
Summer performance is also notable:
At an outdoor 38°C, the heat pump for space heating and cooling maintained the cultivation area at 26°C.
The heat pump for space heating and cooling system recovers about 15 tonnes of condensate daily for irrigation.
The integrated hvac and heat pump solution reduced O&M costs by 40%.
Extended project value
The Central Heat And Air Heat Pump not only achieved precise temperature control but, through the intelligent hvac system with heat pump, delivered measurable agronomic and environmental benefits:
Tomato yield increased to 45 kg/m² (compared with 28 kg/m² in conventional greenhouses).
Energy cost share fell from 22% to 9%.
CO₂ emissions were reduced by 380 tonnes per year.
Ground heating extended the crop production cycle to year-round continuous cultivation.
This project demonstrates how Central Heat And Air Heat Pump and integrated hvac system with heat pump technologies can deliver precision climate control, higher yields, lower costs, and reduced emissions for modern, high-value protected agriculture.
