Abstract: Systems for heating or cooling a food service container to an appropriate temperature for service or transport, and cabinets including such systems. A first manifold allows a seal to be made against a first surface of one or more Peltier chips and defines a flow path for a heat transfer fluid which directly contacts the first surfaces of the Peltier chips. The fluid circulates through tubing from the first manifold to a first radiator. A second opposite manifold defines a flow path for a heat transfer fluid which directly contacts the second surfaces of the Peltier chips. The fluid then circulates through tubing from the second manifold to a second radiator. The first radiator may be disposed inside, and the second radiator outside, the cabinet. Application of current in a first direction to the Peltier chips can heat the cabinet and reversal of the current may cool the cabinet.

Abstract: Systems for heating or cooling a food service container to an appropriate temperature for service or transport, and cabinets including such systems. A first manifold allows a seal to be made against a first surface of one or more Peltier chips and defines a flow path for a heat transfer fluid which directly contacts the first surfaces of the Peltier chips. The fluid circulates through tubing from the first manifold to a first radiator. A second opposite manifold defines a flow path for a heat transfer fluid which directly contacts the second surfaces of the Peltier chips. The fluid then circulates through tubing from the second manifold to a second radiator. The first radiator may be disposed inside, and the second radiator outside, the cabinet. Application of current in a first direction to the Peltier chips can heat the cabinet and reversal of the current may cool the cabinet.

Abstract: Systems and apparatus for heating or cooling food to an appropriate temperature for service using a standard food service container, such as a chafing dish or food cart. A thermally conductive plate has a plurality of Peltier chips attached thereto to drive a temperature difference. The Peltier chips are in thermally conductive contact with a heat exchanger. A heat transfer liquid circulates through tubing in the heat exchanger and a separate radiator, perpetuating the temperature difference at the plate. The heat exchanger and radiator may be spaced apart by a gap. One or more fans may be placed to encourage airflow through the radiator. A coolant reservoir and pump may be included.

Abstract: Systems and apparatus for heating or cooling food to an appropriate temperature for service using a standard food service container, such as a chafing dish or food cart. A thermally conductive plate has a plurality of Peltier chips attached thereto to drive a temperature difference. The Peltier chips are in thermally conductive contact with a heat exchanger. A heat transfer liquid circulates through tubing in the heat exchanger and a separate radiator, perpetuating the temperature difference at the plate. The heat exchanger and radiator may be spaced apart by a gap. One or more fans may be placed to encourage airflow through the radiator. A coolant reservoir and pump may be included.

Abstract: A wellhead 10 for use with subterranean wells includes an improved tubing hanger 16 including an improved electric power cable pack-off port 20 that permits positioning an electric submersible pump (“ESP”) power cable 40 through the port 20 in the tubing hanger. The improved wellhead permits installation of packing 34 and compression rings 30, 32 within the power cable port 20 to create a vapor-tight pressure seal around the outer cable jacket 41. The seal may be rated at pressures of at least 750 psia. The wellhead 10 comprises a wellhead body 12 for supporting a tubing hanger 16, the tubing hanger including a tubing port 22 and a power cable port 20 for passing electrical power from an electrical power source 72 through the power cable port to the electric motor M. The wellhead 10 also includes a cable seal 34 within the power cable port, a lower packing seat 66, and a packing gland 24 selectively moveable with respect to the seat for compressing the cable seal 34 to form a pneumatic seal.

Abstract: A wellhead 10 for use with subterranean wells includes an improved tubing hanger 16 including an improved electric power cable pack-off port 20 that permits positioning an electric submersible pump (“ESP”) power cable 40 through the port 20 in the tubing hanger. The improved wellhead permits installation of packing 34 and compression rings 30, 32 within the power cable port 20 to create a vapor-tight pressure seal around the outer cable jacket 41. The seal may be rated at pressures of at least 750 psia. The wellhead 10 comprises a wellhead body 12 for supporting a tubing hanger 16, the tubing hanger including a tubing port 22 and a power cable port 20 for passing electrical power from an electrical power source 72 through the power cable port to the electric motor M. The wellhead 10 also includes a cable seal 34 within the power cable port, a lower packing seat 66, and a packing gland 24 selectively moveable with respect to the seat for compressing the cable seal 34 to form a pneumatic seal.