In-cabin temperature control and multi-circuit bus air-conditioning systems

In-cabin temperature control and multi-circuit bus air-conditioning systems were developed. The system work dependent on the cooling load either one or more circuits will automatically be switched on. One circuit of the system can have been varying speed in order to fine-tune the cooling response time as the cooling load varies inside bus cabin. Variable-speed compressor provides potential on the load-matching capability, energy saving and thermal comfort of the passengers inside bus cabin. The experiments were conducted on a test rig with temperature setting of 22°C for the conditioned space to evaluate the energy usage of the system with thermostat and fuzzy logic (FLC) controllers. The results indicate that the proposed technique can save energy and improve indoor comfort significantly for multi-circuit bus air-conditioning systems compared to the existing system. The experimental results also showed that more energy savings can be obtained through the use of FLC when compared to the thermostat controller