and not economical when it is used in hot climate. Besides, the
power consumptions of peripheral in SACH-2 need to be
reduced in order to make this technology economical.
The present study further modifies the design of SACH-2
using series configuration similar to SACH-1 (Huang et al.,
2010a) but using a refrigerant pump in ECS and several
advanced control technologies to keep stable performance of
ECS and minimize power consumption of peripherals. This
type of SACH is called “SACH-k2”. In series configuration of
SACH, the ECS is used to cool the condenser of the IAC. The
ECS does not directly provide cooling effect to the cooling
room. Hence, the design of evaporator temperature of ECS can
be raised and the COP of ECS can be increased. In SACH-k2, the
cooling load is steadily supplied by IAC. The solar-driven ECS
acts as a device for energy saving when solar energy is
available.
Several advanced technologies have been developed in
SACH-k2: (1) the refrigerant pump used in ECS requires a
generator liquid level control in ECS to eliminate large level
variation during variable solar radiation and keep stable performance
of ejector; (2) the fan power consumption in cooling
tower of ECS needs to be reduced. The present study focuses on
the development of these technologies and running a field test
to measure the overall performance efficiency of SACH-k2,
including energy consumption of all the peripheral equipment.