Pre-mix fuel fired appliances having improved heat exchange interfaces are disclosed. Embodiments may include a fuel-fired heating appliance having a burner, a first housing comprising an outlet, the first housing disposed adjacent the burner and configured to receive combustion gas from combustion at the burner, and a heat exchanger having a heat exchanger tube with a first bend and a second bend, and an inlet disposed adjacent the outlet of the first housing. The heat exchanger may be configured to receive combustion gas from the first housing. The appliance may include a blower configured to direct air toward the first bend of the heat exchanger tube, and a heat transfer insert disposed at least partially in the heat exchanger tube, the heat transfer insert having a first end disposed in the first housing, and a second end disposed adjacent to the first bend of the heat exchanger tube.

Embodiments are directed to a temperature calibration system that includes a closed fluidic system, such as a thermosiphon or a heat pipe. The closed fluidic system includes a valve for fluidly separating components therein from each other. In one embodiment, the closed fluidic system is a thermosiphon (or a heat pipe) and the valve is configured, in a closed state, to cover a port of the condenser to fluidly separate the condenser from other components of the thermosiphon. The valve may be a passively activated valve or an electrically actuated valve. In some embodiments, the valve is thermally actuated such that the valve changes state in response to changes in temperature.

An exhaust gas cooler includes tubes to convey an exhaust gas through the cooler, a header plate to receive ends of the tubes, and a diffuser. The diffuser and the header plate together define an inlet plenum for the exhaust gas. The diffuser includes a connection flange to join the diffuser to the header plate, and the connection flange is substantially shielded from the flow of exhaust gas passing through the inlet plenum.

When products to be shipped are temperature-sensitive, it is necessary to maintain a substantially uniform and constant temperature to avoid spoilage. As a result, thermal shields are often placed on top of the products. Many designs for thermal shields have been considered in the past but improvements are still desired. Accordingly, there is provided a multilayer thermal shield (100) comprising a thermally conductive layer (108), and at least one heat exchange fluid circuit (120) coupled to a first surface of the thermally conductive layer, the at least one heat exchange fluid circuit comprising at least one inlet (124) configured to permit the ingress of heat exchange fluid. The thermal shield further comprises an outer insulation layer (104) connected to a first surface of the thermally conductive layer (108) and comprising grooves designed to receive the heat exchange fluid circuit. The thermal shield further comprises an inner insulation layer (110) connected to a second surface of the thermally conductive layer (108).

A water-cooled EGR cooler is to be supplied with exhaust gas from an exhaust line and is to re-circulate the cooled exhaust gas to an intake line. A housing has an exhaust inlet, an exhaust outlet, a coolant inlet, and a coolant outlet. A heat exchange member is disposed in the housing and includes exhaust gas passages from the exhaust inlet to the exhaust outlet at a predetermined interval and also includes a coolant passage through which coolant can flow from the coolant inlet to the coolant outlet between the exhaust gas passages. A pipe member includes a bypass passage formed between an upper surface of the heat exchange member and an inside upper surface of the housing to allow the exhaust gas to bypass the heat exchange member and flow between the upper surface of the heat exchange member and the coolant outlet.

A curved plate heat exchanger of the present invention comprises a heat exchange unit in which heat medium flow paths and combustion gas flow paths are alternately formed to be adjacent to each other in spaces between a plurality of plates, wherein the plurality of plates are configured in such a manner whereby a plurality of unit plates, in which first and second plates are stacked, are formed; wherein the heat medium flow paths are formed between the first plate and the second plate of the unit plate; and wherein the combustion gas flow paths are formed between the second plate of the unit plate located on one side of the adjacent unit plates and the first plate of the unit plate located on the other side, and is formed to maintain a constant interval along a flow direction of a combustion gas.

A round plate heat exchanger of the present invention has a heat exchange part in which heat medium flow paths and combustion gas flow paths are formed so as to be alternatingly adjacent to each other in a space among a plurality of plates, wherein the plurality of plates forming the heat exchange part are formed by stacking a plurality of unit plates comprising a first plate and a second plate stacked therein, the plurality of heat medium flow paths are formed to be spaced from each other between the first plate and the second plate of the unit plate, a heat medium connection flow path is formed in a part of the region of the heat medium flow paths located adjacent to each other, and the combustion gas flow path is formed between the second plate of the unit plate, located at one side of the unit plate, among the unit plates, which are stacked adjacent to each other, and the first plate of the unit plate, located at the other side of the unit plate.

The present invention relates to a heat exchanger comprising a plurality of exchange tubes (1) mounted joined longitudinally in such a way as to create a front surface portion (4) creating an obstacle to an incident heat flow and at least one heat flow sensor (5) disposed in a support (12) located between two adjacent exchange tubes (1), characterized in that the support (12) of the heat flow sensor (5) is brazed to at least one of the two tubes (1) and is flattened on the side that is to be disposed at the front (4), with reference to the incident heat flow, in such a way as to be able to be inserted between the two adjacent tubes (1) at the location of said local deformations (11).

A system for determining a cleaning schedule for an asset is provided. In some aspects, the system can include a plurality of sensors arranged to monitor an asset and a computing system including at least one data processor and memory storing instructions, which when executed by the at least on data processor causes the at least one data processor to perform operations. In some aspects, the operations performed by the processor can include receiving, from the plurality of sensors, the data characterizing the operational efficiency of the asset, determining an operational efficiency of the asset determining an operational efficiency threshold characterizing an undesirable operating efficiency, determining, using an optimization algorithm, a cleaning schedule for the asset based on the operational efficiency of the asset and the operational efficiency threshold and providing the cleaning schedule.

A tube bundle heat exchanger having a straight-tube configuration, comprising a pressure vessel, a straight-tube bundle comprising a number of straight tubes which are arranged so as to be guided through an inlet tubesheet and an outlet tubesheet and to extend through the interior space of the pressure vessel. A cooler for gas turbine cooling air comprising a tube bundle heat exchanger, a gas turbine power plant and a gas and steam turbine power plant comprising a cooler for gas turbine cooling air according to the invention, as well as a process gas cooler and a method for the cooling of cooling air using such a cooler for gas turbine cooling air.