What are the common applications for 2-pipe heating and cooling plants?

2-pipe systems are often used in buildings with simpler heating and cooling requirements, such as residential buildings, small offices, or retail spaces. They are also suitable for buildings with limited space or budget constraints, as they require less piping and equipment compared to 4-pipe systems. Additionally, 2-pipe systems can be used in buildings with a dominant heating or cooling load, where simultaneous heating and cooling is not necessary.