Abstract: An enhanced gravity-driven, thin film condensation heat transfer condenser is disclosed for use in a thermosyphon performing in two perpendicular orientations, as well as orientations in between. The thermosyphon includes an evaporator fluidly coupled to a first condenser configured with a plurality of fins, with each of the plurality of fins having notches adjacent to flanges, the notches forming vapor flow channels through the plurality of fins. The first condenser is fluidly coupled to a second condenser, and vapor flowing from the evaporator must first pass through the first condenser before entering the second condenser.

Abstract: The device and methods described herein relate to the isothermal heat transport through an intermittent liquid supply to an evaporator device, thereby enabling high evaporative heat transfer coefficients. A liquid and vapor mixture flows through miniature and micro-channels in an evaporator and addresses flow instabilities encountered in these channels as bubbles rapidly expand. Additionally, a high percentage of the fins are exposed to vapor and limit the required charge of refrigerant t within the system due to effective condensate removal in the condenser.

Abstract: A thermosyphon having a condenser located below the evaporator, or an evaporator above the condenser, is presented. Various embodiments include serially configured evaporators and condensers, so that the excess pressure head from any condenser to evaporator liquid coupling may be utilized to overcome deficient pressure head in a subsequent condenser to evaporator liquid coupling.

Abstract: An enhanced gravity-driven, thin film condensation heat transfer condenser is disclosed for use in a thermosyphon performing in two perpendicular orientations, as well as orientations in between. The thermosyphon includes an evaporator fluidly coupled to a first condenser configured with a plurality of fins, with each of the plurality of fins having notches adjacent to flanges, the notches forming vapor flow channels through the plurality of fins. The first condenser is fluidly coupled to a second condenser, and vapor flowing from the evaporator must first pass through the first condenser before entering the second condenser.

Abstract: The device and methods described herein relate to the isothermal heat transport through an intermittent liquid supply to an evaporator device, thereby enabling high evaporative heat transfer coefficients. A liquid and vapor mixture flows through miniature and micro-channels in an evaporator and addresses flow instabilities encountered in these channels as bubbles rapidly expand. Additionally, a high percentage of the fins are exposed to vapor and limit the required charge of refrigerant t within the system due to effective condensate removal in the condenser.

Abstract: A thermosyphon having an evaporator, a condenser having a condenser liquid pool accumulated at the bottom thereof creating a condenser liquid pool surface, a vapor tube fluidly coupling the evaporator to the condenser, and a liquid tube fluidly coupling the condenser to the evaporator, wherein the liquid tube apex is above the condenser liquid pool surface, thereby trapping vapor and preventing liquid from passing from the condenser to the evaporator. The application of heat to the evaporator increases the total system internal temperature and pressure causing condensation of the vapor in the liquid tube. As the liquid level in the liquid tube increases above the lower interior surface of the apex of the liquid tube, the liquid tube is primed thereby creating the pressure head needed to overcome the hydrodynamic losses inside the thermosyphon. Various embodiments allow passive start-up, regardless of the initial distribution of liquid inside the thermosyphon.

Abstract: The device and methods described herein relate to the isothermal heat transport through an intermittent liquid supply to an evaporator device, thereby enabling high evaporative heat transfer coefficients. A liquid and vapor mixture flows through miniature and micro-channels in an evaporator and addresses flow instabilities encountered in these channels as bubbles rapidly expand. Additionally, a high percentage of the fins are exposed to vapor and limit the required charge of refrigerant t within the system due to effective condensate removal in the condenser.

Abstract: The device and methods described herein relate to the isothermal heat transport through an intermittent liquid supply to an evaporator device, thereby enabling high evaporative heat transfer coefficients. A liquid and vapor mixture flows through miniature and micro-channels in an evaporator and addresses flow instabilities encountered in these channels as bubbles rapidly expand. Additionally, a high percentage of the fins are exposed to vapor and limit the required charge of refrigerant t within the system due to effective condensate removal in the condenser.

Abstract: The device and methods described herein relate to the isothermal heat transport through an intermittent liquid supply to an evaporator device, thereby enabling high evaporative heat transfer coefficients. A liquid and vapor mixture flows through miniature and micro-channels in an evaporator and addresses flow instabilities encountered in these channels as bubbles rapidly expand. Additionally, a high percentage of the fins are exposed to vapor and limit the required charge of refrigerant within the system due to effective condensate removal in the condenser.

Abstract: The device and methods described herein relate to the isothermal heat transport through an intermittent liquid supply to an evaporator device, thereby enabling high evaporative heat transfer coefficients. A liquid and vapor mixture flows through miniature and micro-channels in an evaporator and addresses flow instabilities encountered in these channels as bubbles rapidly expand. Additionally, a high percentage of the fins are exposed to vapor and limit the required charge of refrigerant t within the system due to effective condensate removal in the condenser.

Abstract: The device and methods described herein relate to the isothermal heat transport through an intermittent liquid supply to an evaporator device, thereby enabling high evaporative heat transfer coefficients. A liquid and vapor mixture flows through miniature and micro-channels in an evaporator and addresses flow instabilities encountered in these channels as bubbles rapidly expand. Additionally, a high percentage of the fins are exposed to vapor and limit the required charge of refrigerant t within the system due to effective condensate removal in the condenser.

Abstract: A thermosyphon having a condenser located below the evaporator, or an evaporator above the condenser, is presented. Various embodiments include serially configured evaporators and condensers, so that the excess pressure head from any condenser to evaporator liquid coupling may be utilized to overcome deficient pressure head in a subsequent condenser to evaporator liquid coupling.

Abstract: A thermosyphon having an evaporator, a condenser having a condenser liquid pool accumulated at the bottom thereof creating a condenser liquid pool surface, a vapor tube fluidly coupling the evaporator to the condenser, and a liquid tube fluidly coupling the condenser to the evaporator, wherein the liquid tube apex is above the condenser liquid pool surface, thereby trapping vapor and preventing liquid from passing from the condenser to the evaporator. The application of heat to the evaporator increases the total system internal temperature and pressure causing condensation of the vapor in the liquid tube. As the liquid level in the liquid tube increases above the lower interior surface of the apex of the liquid tube, the liquid tube is primed thereby creating the pressure head needed to overcome the hydrodynamic losses inside the thermosyphon. Various embodiments allow passive start-up, regardless of the initial distribution of liquid inside the thermosyphon.

Abstract: Fluid to fluid heat exchange processes involve the hot fluid reducing in temperature and the cold fluid increasing in temperature. To transfer heat between the two fluids, a third, separated heat transfer fluid is often used. The present invention allows for passive heat transfer between the two fluids, using a separate heat transfer fluid, while enabling heat absorption and rejection through a continuously variable temperature.

Abstract: Fluid to fluid heat exchange processes involve the hot fluid reducing in temperature and the cold fluid increasing in temperature. To transfer heat between the two fluids, a third, separated heat transfer fluid is often used. The present invention allows for passive heat transfer between the two fluids, using a separate heat transfer fluid, while enabling heat absorption and rejection through a continuously variable temperature.

Abstract: This invention involves a heat recovery system implemented in a vented clothes dryer, through the use of a passive, indirect heat exchanger. The recovered waste heat is used to preheat the air into the dryer's heater, thus enabling lower total energy consumption per load. The heat recovery unit is integrated within the boundaries of the dryer's cabinet in such a way that preheated air enters the heating tube or heating element ducting.

Abstract: A method and system is disclosed in which an air to air heat exchanger keeps two air streams separate through the use of metal fins. Edges of alternating fins are folded so that the end is in the proximity of the adjacent fin and the remaining gap is sealed. The fin stack is held together by interlocking features or through the use of a tube, in which case the fin stacks may be stamped and stacked on alignment stakes during production using the same holes as the tubes. The heat exchanger may have extended use in removing moisture and heat from a hot humid air stream. The heat exchanger has utility in heat recovery ventilation systems, clothes dryer heat recovery or other air to air heat exchanger processes where the pressure difference between the airstreams is less than approximately 5000 Pa.

Abstract: The device and methods described herein relate to the isothermal heat transport through an intermittent liquid supply to an evaporator device, thereby enabling high evaporative heat transfer coefficients. A liquid and vapor mixture flows through miniature and micro-channels in an evaporator and addresses flow instabilities encountered in these channels as bubbles rapidly expand. Additionally, a high percentage of the fins are exposed to vapor and limit the required charge of refrigerant within the system due to effective condensate removal in the condenser.