Abstract: Conditioned air discharged from a vehicle heating, ventilation and air conditioning (HVAC) unit is further conditioned by a thermoelectric (TE) air temperature control module and then directed to air passages in a vehicle seat. Activation of the TE air temperature control module is based on climate control parameters utilized by the HVAC unit, including the set temperature and the cabin air temperature.

Abstract: In order to reduce refrigerant leakage from an automotive air conditioning system, the leakage paths are kept sealed by automatically reducing the output of a variable displacement compressor (12) after initial operation of the engine for a predetermined number of five minutes, and then only for a predetermined number of ten seconds, that is, so long as there has been an air conditioning on signal by the operator. After the reduction in output for ten seconds, the output of the compressor (12) is returned to full output for a predetermined number of two air-conditioning minutes, which is then followed by another ten seconds of reduced output.

Abstract: Industrial wastewater is contacted with a weak acid cation exchange resin, in the hydrogen ion form, to substantially reduce the sodium and ammonium alkalinity levels rendering the wastewater suitable, for example, as an environmentally acceptable cooling medium.

Abstract: Silica can be removed effectively from a mixed bed demineralizer containing an anion exchange resin and a cation exchange resin during regeneration by(1) passing from about 30 to about 80 volume % of an anion regenerant solution through only the anion exchange resin,(2) passing the remaining portion of the anion regenerant solution through both the anion exchange resin and the cation exchange resin, and(3) passing a stream of cation regenerant solution through the cation exchange resin.When the anion and cation exchange resins are regenerated according to this procedure, the amount of silica on the resins is reduced such that when silica containing water is passed through the demineralizer during normal operations, the concentration of silica in the treated water as SiO.sub.2 will be less than 0.1, most preferably less than 0.005, milligrams per liter.