Development of dehumidification water loop heat pump units for large underground spaces

Presents a new type of dehumidification water loop heat pump unit with the function of dehumidification, precise temperature adjustment and heating, capable of meeting different demands of partial and full load conditions of underground spaces, and transferring heat inside the space by the water loop. Applies PLC system to control compressor loading and three-way proportional control valve to adjust refrigerant rate so as to control temperature appropriately and improve control precision of temperature and humidity, and improves the unit performances markedly by techniques of dual flow direction design and condensation area increasing. Tests performance of the unit on the test bed.