Abstract: A refrigerant system includes a compressor, multiple pressure sensors, multiple refrigerant flow valves, and a processor. The compressor is configured to present a refrigerant at a first pressure. A first pressure sensor is configured to measure the first pressure of the refrigerant. A second pressure sensor is configured to measure a second pressure of the refrigerant. The refrigerant flow valves have a plurality of flow valve positions. The processor is configured to calculate a delta value as a difference between the first pressure and the second pressure, calculate an expected delta value between the first pressure and the second pressure based on a ratio of a low-side density of the refrigerant at the compressor to the flow valve positions, and perform a remedial action where the delta value deviates from the expected delta value by greater than a threshold value.

Abstract: A refrigerant system includes a compressor, multiple pressure sensors, multiple refrigerant flow valves, and a processor. The compressor is configured to present a refrigerant at a first pressure. A first pressure sensor is configured to measure the first pressure of the refrigerant. A second pressure sensor is configured to measure a second pressure of the refrigerant. The refrigerant flow valves have a plurality of flow valve positions. The processor is configured to calculate a delta value as a difference between the first pressure and the second pressure, calculate an expected delta value between the first pressure and the second pressure based on a ratio of a low-side density of the refrigerant at the compressor to the flow valve positions, and perform a remedial action where the delta value deviates from the expected delta value by greater than a threshold value.

Abstract: A thermal transfer system for a reductant delivery system comprising a reductant storage tank comprising a shell defining an inner tank cavity and a pump assembly disposed in the inner tank cavity. A thermal sink is disposed on or adjacent to an exterior portion of the shell and a thermal conductor extends from the thermal sink, through the shell, to terminate at a location closely adjacent to the pump assembly. The thermal conductor operates to transfer thermal energy from a location adjacent to the pump assembly to the thermal sink, to thereby induce accelerated freezing of the reductant.

Abstract: A thermal transfer system for a reductant delivery system comprising a reductant storage tank comprising a shell defining an inner tank cavity and a pump assembly disposed in the inner tank cavity. A thermal sink is disposed on or adjacent to an exterior portion of the shell and a thermal conductor extends from the thermal sink, through the shell, to terminate at a location closely adjacent to the pump assembly. The thermal conductor operates to transfer thermal energy from a location adjacent to the pump assembly to the thermal sink, to thereby induce accelerated freezing of the reductant.