In an ejector cycle with an ejector including a nozzle for decompressing refrigerant, a refrigerant outlet is provided in an evaporator at a position upper than a refrigerant inlet. In some embodiments, a random character table is generated by a client device and is used, along with the shared character password and shared image, to calculate a one-time password. A counter is supplied with a pulse of a measured oscillating frequency and produces a pulse having a pulse width up to the counting of a predetermined number of pulses. The incoming text messages are progressively processed through a customer support scenario interactively monitored and controlled by the live agent via the agent console. Decreasing the noise level results in increasing the signal-to-noise ratio and increasing the data rate.