As a result of recent improvements in engine efficiency, vehicle heater performance has decreased and the
demand for auxiliary heat sources is increasing. To help meet this need, we have developed an auxiliary heat
system known as the “Hot Gas Heater”. The Hot Gas Heater uses components common to the vehicle airconditioning
system that are not used during winter. However, there are some concerns with this system. In this
paper we describe our solutions to these problems. We reduced gas flow noise through multi-stage pressure
reduction, and prevented fogging by adding “Anti-Fogging Algorithm” and “evaporator outlet air temperature
control” functions to the system. As a further benefit, we developed a New Accumulator Cycle that transfers the
cooling cycle accumulator tank to the high-pressure side.
demand for auxiliary heat sources is increasing. To help meet this need, we have developed an auxiliary heat
system known as the “Hot Gas Heater”. The Hot Gas Heater uses components common to the vehicle airconditioning
system that are not used during winter. However, there are some concerns with this system. In this
paper we describe our solutions to these problems. We reduced gas flow noise through multi-stage pressure
reduction, and prevented fogging by adding “Anti-Fogging Algorithm” and “evaporator outlet air temperature
control” functions to the system. As a further benefit, we developed a New Accumulator Cycle that transfers the
cooling cycle accumulator tank to the high-pressure side.
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