In heating systems, four different types of heat transfer media are commonly used. Heating systems are classified and named according to the type of fluid or medium used to transfer thermal energy.
Hot Water Heating Systems: : Water is the most efficient and cost-effective medium for heat transfer. Hot water heating systems operate with supply water temperatures of up to 110°C and are widely used in modern building heating applications. These systems are typically designed with a supply temperature of 80°C and a return temperature of 60°C. For underfloor heating applications, design temperatures are generally 55°C supply and 45°C return, providing efficient and comfortable heat distribution.
High-Temperature Hot Water Heating Systems: These systems operate with supply water temperatures above 110°C. They are commonly used in large-scale district heating networks and industrial process heating applications where high thermal capacity and efficient heat distribution are required.
Steam Heating Systems: Due to their high temperature capability and excellent heat transfer capacity, steam heating systems are preferred in large industrial facilities and process heating applications. They provide efficient energy distribution and are ideal for operations that require substantial thermal output.
Thermal Oil Heating Systems: As water temperature increases, the pressure within the heating system also rises, resulting in higher installation and operating costs as well as additional safety requirements. For this reason, thermal oil heating systems are often preferred in industrial process heating applications that require high operating temperatures. These systems can deliver high temperatures efficiently while operating at relatively low pressures.
Comfort heating systems generally use low-temperature boilers. In natural gas-fired heating systems where the return water temperature is below 50°C, high-efficiency condensing boilers should be used. To increase efficiency in comfort heating systems, programmable automation systems operating according to outdoor and indoor air temperatures, modulating burners, economizers, frequency inverter circulation pumps, thermostatic control equipment in heated spaces, heat recovery devices, and insulation materials with low thermal conductivity calculated in accordance with standards should be used.