Patent ID: 9638434
Date: 2017-05-02
CPC Classifications: F24F,F25B,Y02B

Claim:
1. An environment control system for supplying conditioned air to a portable shelter, the control system comprising: a refrigerant condenser, a condenser fan for moving air over the refrigerant condenser, and a variable-speed motor for operating the condenser fan; an evaporator, an evaporator fan for moving air over the evaporator and into the portable shelter, and a variable-speed motor for operating the evaporator fan; a compressor for receiving refrigerant from the evaporator and for transferring the refrigerant to the condenser; a management system including a memory device and a processor, the memory device being configured to store operating limits, and wherein the processor is configured to make determinations based on (1) the operating limits and (2) measured parameters, and to adjust one or more of the speed of the condenser fan, the speed of the evaporator fan, and the speed of the compressor in response to the determinations, to thereby optimize performance of the environment control system within the operating limits; and an adjustable fresh air vent for allowing fresh air into the control system, and an air quality sensor for sensing a carbon dioxide contamination level, and wherein the management system is configured to operate the control system in active and inactive modes, wherein the management system adjusts the fresh air vent in response to a signal from the air quality sensor to maintain the carbon dioxide contamination level below a first threshold, in the active mode, and wherein the fresh air vent is closed regardless of the carbon dioxide contamination level, in the inactive mode; and wherein the management system is configured to adjust the fresh air vent in response to a signal from the air quality sensor to permit the carbon dioxide contamination level to exceed the first threshold and to maintain the carbon dioxide contamination level below a second threshold, when the compressor speed exceeds one of the operating limits and while the portable shelter is occupied by one or more persons, the second threshold being greater than the first threshold.