Energy-saving constant-temperature and constant-humidity unit

The invention discloses an energy-saving constant-temperature and constant-humidity unit. The unit comprises a compressor, a four-way valve, a condenser, a heating throttling device, a refrigerating throttling device and an evaporator. During refrigeration, high-temperature and high-pressure gas exhausted by the compressor becomes high-pressure liquid after passing through the four-way valve and the condenser, then becomes a low-temperature and low-pressure gas-liquid two-phase working medium after passing through the refrigerating throttling device, becomes low-temperature and low-pressure gas after passing through the evaporator and returns to the compressor. The heat pump compressor is adopted for heating, the heating energy efficiency can reach about 3.5-4.0, and the heating power consumption and cost are greatly reduced, so that the operation energy consumption of the whole unit is reduced. 本发明公开了一种节能型恒温恒湿机组，包括压缩机、四通阀、冷凝器、制热节流装置、制冷节流装置及蒸发器，在制冷时，所述压缩机排出的高温高压气体，经四通阀、冷凝器后成为高压液体，然后经制冷节流装置后，成为低温低压气液两相工质，再经蒸发器