Feasibility Analysis of Joint Operation of Ground Source Heat Pump and Surface Heating
October 02 03:05:42, 2025
**Abstract:** This paper introduces the characteristics of ground source heat pump systems and low-temperature radiant floor heating. By comparing the initial investment and operating costs of ground source heat pump systems, low-temperature radiant floor heating, and traditional chiller units with radiator systems, it is evident that the combined operation of radiant floor heating offers significant advantages in terms of energy efficiency, environmental protection, and cost-effectiveness. The paper also highlights the challenges that need to be addressed for wider adoption of this system.
**Keywords:** Ground source heat pump; Low temperature radiant floor heating; Energy saving; Environmental protection; Economy
**1. Introduction**
A complete heating and air conditioning system typically consists of three main components: the heat (or cold) source, the piping system, and the terminal devices (indoor heating or cooling equipment). Choosing a suitable combination of these elements has always been a key focus for engineers and scientists in building services. While many studies have analyzed either the heat/cold source or the terminal devices individually, the integration of different sources and terminals is equally important for optimal performance.
**1.1 Overview of Ground Source Heat Pump**
First introduced in a Swiss patent in 1912, the ground source heat pump is an efficient and energy-saving system that utilizes the stable low-temperature geothermal resources from the ground—such as soil or groundwater—to provide heating and cooling. In winter, it acts as a heat pump, extracting heat from the ground and transferring it indoors, while storing cold for summer use. Conversely, in summer, it functions as a cooling system, using the ground as a heat sink. Key features include:
- **Renewable energy source**: The earth absorbs and stores a large portion of solar energy, making it a sustainable and inexhaustible resource.
- **Low emissions**: Compared to air-source heat pumps and conventional boilers, it emits significantly less pollution.
- **Cost-effective**: It operates efficiently due to the stable underground temperature, resulting in higher COP values and lower energy consumption.
- **Multi-functional**: It can be used for heating, cooling, and domestic hot water, making it ideal for various applications like residential, commercial, and public buildings.
**1.2 Low-Temperature Radiant Floor Heating**
Low-temperature radiant floor heating is a system that uses the floor as a heat emitter. It provides comfortable, even warmth by radiating heat from the floor surface. This method has been used since the 1930s in some countries and gained popularity in China after advancements in plastic pipe technology. Modern materials such as PEX, PERT, and PB offer durability, flexibility, and long service life, making the system more reliable and efficient. Benefits include high energy efficiency, comfort, hygiene, and ease of control.
**2. Coupling Analysis of Ground Source Heat Pump and Radiant Floor Heating**
Ground source heat pumps can supply low-temperature hot water, which is well-suited for radiant floor heating systems. The compatibility between the two enhances system performance and energy efficiency. For example, the ground source heat pump’s stable output matches the continuous heating demand of radiant floors, leading to better overall efficiency.
**Economic Analysis**
Comparing the initial investment and operating costs of different systems reveals that although the upfront cost of a ground source heat pump and radiant floor system is higher, the long-term savings in energy and maintenance make it a worthwhile investment. Data from case studies show that energy savings can reach up to 40%, with a payback period of around 5 years for a 3,000 square meter building.
**3. Challenges and Future Directions**
Despite its benefits, several challenges remain. These include optimizing system design for multi-seasonal use, improving heat exchanger efficiency, and ensuring consistent performance across different soil types. Further research is needed to enhance the scalability and adaptability of ground source heat pump systems.
In conclusion, the integration of ground source heat pumps with low-temperature radiant floor heating represents a promising approach for sustainable and efficient building climate control. With continued innovation and optimization, this system can play a vital role in reducing energy consumption and environmental impact.