Abstract: A thermally integrated system combining a water heater tank with a refrigeration unit in a manner whereby heat dissipated by the unit serves to heat the water in the tank, the efficiency of the unit being maintained despite changing temperatures in the water tank. In this system, an external line conducting the refrigerant and acting as an auxiliary condenser is extended between the compressor and the main condenser of the refrigerator unit. The external line first passes through the upper region of the tank where it acts in conjunction with a water jacket interposed in the tank outlet pipe as a heat booster, the line then running in a coiled formation through the lower region of the tank in heat exchange relation with the relatively cold incoming water supplied by an inlet pipe.

Abstract: An improvement in a mechanical seal assembly for a slurry pump, or like shaft rotating in a housing subject to incursions of grit contaminants of the type having relatively rotating first and second seal elements in annular engagement defining the seal, the first of the seal elements comprising telescopically interfitted inner and outer cylindrical members having seal-wear-responsive extensile movement to maintain sealing engagement with the second seal element, the grit contaminants tending to work between the first element inner and outer members and block their telescoping movement; the improvement comprising a rigid cylindrical shroud axially opposing and radially enclosing the first element concentrically for a substantial distance against grit contamination blocking inner and outer member telescoping movement.