Auxiliary HVAC system for vehicle sleeper compartment
A battery powered auxiliary HVAC system designed to heat and cool at least a sleeper compartment of a vehicle such as a truck with a management system for conserving battery power. The management system includes a processor connected to temperature sensors, motion sensors, occupancy sensors, etc. for controlling a variable speed compressor, evaporator fan and condenser fan. A fuel fired heater is positioned between an evaporator coil in the inlet of an enclosure and the evaporator fan in an outlet of the enclosure such that air flow passes around the heater. The power electronics to operate the system may be actively cooled by connection tubing providing a heat sink between an evaporator outlet and a compressor inlet.
1. An integrated HVAC system powered by a DC battery source and adapted to heat and cool at least a sleeper compartment of a truck, said integrated HVAC system including an enclosure in the sleeper compartment with an evaporator coil in an air inlet and an evaporator fan in an air outlet for pulling air through the condenser coil and ducting the air out the air outlet, a fuel fired heater in the enclosure positioned between the evaporator coil and the evaporator fan, said heater having a fan for forcing air through the heater, said enclosure further including a compressor, a power booster for the compressor and an electronic board mounted on the power booster for controlling the power supplied to the compressor by the power booster, said booster mounted on a heat sink in thermal contact with vaporized refrigerant exiting the evaporator coil, said heat sink cooling the power booster and electronic board, the integrated HVAC system further including a condenser and a condenser fan outside the truck, said compressor, evaporator fan and condenser fan having variable speed motors controlled by a processor mounted in the enclosure.
2. The integrated HVAC system of claim 1 wherein the processor can collect real time performance data.
3. The integrated HVAC system of claim 2 wherein the processor is connected to an external data server for passage of the real time performance data to the external data server.
4. The integrated HVAC system of claim 1 wherein the processor is programmed to control the variable speed motors of the compressor, evaporator fan and condenser fan based on temperature data taken by sensors in the sleeper compartment, in air passing into the evaporator coil and in air surrounding the condenser coil.
5. The integrated HVAC system of claim 1 further including a temperature sensor on the evaporator coil.
6. The integrated HVAC system of claim 1 wherein the processor manages the variable speed motors of the compressor, evaporator fan and condenser fan in a manner that a storage capacity of the DC battery source is not exceeded for a given runtime of the system.
7. The integrated HVAC system of claim 1 further including a lensless occupancy sensor in the sleeper compartment coupled to the processor, said processor shutting down the integrated HVAC system or moderating conditioning by the integrated HVAC system on receipt of a signal from the occupancy sensor that the sleeper compartment is not occupied.
8. The integrated HVAC system of claim 1 wherein the truck has a diesel powered A/C system in the sleeper compartment with a ducting system with vents for delivering conditioned air above a bunk in the sleeper compartment, said air flow passing out of the enclosure outlet of the integrated HVAC system ducted into the preexisting ducting system of the diesel powered A/C system.
9. The integrated HVAC system of claim 1 wherein the processor is programmed to control the variable speed motors of the compressor, evaporator fan and condenser fan based on temperature data taken by sensors in the sleeper compartment, in air passing into the evaporator coil and in air surrounding the condenser coil.
10. The integrated HVAC system of claim 9 where additional temperature sensors connected to the processor are provided to measure the temperature of the evaporator coil, the temperature of refrigerant exiting the evaporator coil and refrigerant exiting the compressor.
11. The integrated HVAC system of claim 1 further including an accelerometer coupled to the processor, said processor shutting the integrated HVAC system down on receipt of a signal from the accelerometer that the truck is in motion.
12. The integrated HVAC system of claim 1 further including a lensless occupancy sensor in the sleeper compartment coupled to the processor, said processor shutting down the integrated HVAC system or moderating conditioning by the integrated HVAC system on receipt of a signal from the occupancy sensor that the sleeper compartment is not occupied.