Heat transfer apparatus and heat transfer system for masonry heater

Abstract

An apparatus and system for efficiently and safely transferring heat from a masonry heater to an external heating device using coil pipes and a liquid circulation pump. Circulation of a heat transfer liquid in the apparatus and system is controlled based on the measured temperature of the heat transfer liquid in the coil pipe on a return side of the masonry heater. Two additional sensors near the external heating device are used to control the flow rate of the circulation of the heat transfer liquid in the apparatus and system, thereby controlling the amount of heat actually transferred to the external heating device.

1 - 28 . (canceled) 
     
     
         29 . A heat transfer system comprising:
 a masonry heater;   a coil pipe extending into a firebox of the masonry heater through a first aperture in a wall of the firebox and exiting through a second aperture in the wall of the firebox, the coil pipe winding back and forth in the firebox and being disposed so as to be exposed to fire in the firebox, wherein a heat transfer liquid enters the coil pipe from a supply side of the coil pipe at the first aperture and the liquid exits the coil pipe from a return side of the coil pipe at the second aperture;   a first sensor disposed in a liquid return path on the return side of the coil pipe, the first sensor extending into the coil pipe where the coil pipe is directly exposed to heat within the firebox of the masonry heater, and the first sensor being configured to detect a temperature of the heat transfer liquid in the liquid return path, on the return side of the coil pipe;   a circulation pump configured to transfer the heat transfer liquid from the return path to an output of the coil pipe when the circulation pump is circulating the heat transfer liquid in the coil pipe, and stopping transfer of the heat transfer liquid to the output of the coil pipe when the circulation pump is not circulating the heat transfer liquid in the coil pipe; and   a controller configured to control whether the circulation pump circulates the heat transfer liquid based on the temperature detected by the first sensor; and   a heating device that absorbs heat from the heat transfer liquid transferred from the masonry heater, the heating device being a liquid heater that heats a second liquid using the heat transferred from the masonry heater, the liquid heater comprising a plate heat exchanger, wherein the liquid transferred from the masonry heater heats the plate heat exchanger, and the plate heat exchanger heats the second liquid;   a second controller that controls flow of the liquid from an inside of the liquid heater to a heat dump zone outside of the liquid heater; and   a fourth sensor that detects a temperature of the second liquid in the liquid heater, wherein the second controller prevents the second liquid from flowing to the heat dump zone heater when the temperature of the second liquid in the heater is less than a third temperature, and the second controller allows the second liquid to flow to the heat dump zone when the temperature of the liquid in the liquid heater is greater than the third temperature.   
     
     
         30 . The heat transfer system according to  claim 29  further including:
 a fifth sensor that measures the temperature of the liquid flowing to the heat dump zone from the liquid heater; and 
 a sixth sensor that measures the temperature of the liquid flowing back to the liquid heater from the heat dump zone, wherein the second controller controls a second flow rate of the liquid flowing to the heat dump zone based on a second difference in temperature measured by the fifth sensor and the sixth sensor. 
 
     
     
         31 . The heat transfer system according to  claim 30 , wherein:
 the second controller is configured to determine a second temperature difference between the temperatures measured by the fifth sensor and the sixth sensor,   the second controller is configured to increase a flow rate of the liquid to the heat dump zone when the second temperature difference is greater than a second temperature threshold, and   the second controller is configured to decrease the flow rate of the liquid to the heat dump zone when the second temperature difference is less than the second temperature threshold.   
     
     
         32 . A heat transfer system comprising:
 a masonry heater;   a coil pipe extending into a firebox of the masonry heater through a first aperture in a wall of the firebox and exiting through a second aperture in the wall of the firebox, the coil pipe winding back and forth in the firebox and being disposed so as to be exposed to fire in the firebox, wherein a heat transfer liquid enters the coil pipe from a supply side of the coil pipe at the first hole aperture and the liquid exits the coil pipe from a return side of the coil pipe at the second hole aperture;   a first sensor disposed in a liquid return path on the return side of the coil pipe, the first sensor extending into the coil pipe where the coil pipe is directly exposed to heat within the firebox of the masonry heater, and the first sensor being configured to detect the temperature of the heat transfer liquid in the liquid return path, on the return side of the coil pipe;   a circulation pump configured to transfer the heat transfer liquid from the return path to an output of the heat transfer apparatus when the circulation pump is circulating the heat transfer liquid in the coil pipe, and stopping transfer of the heat transfer liquid to the output of the heat transfer apparatus when the circulation pump is not circulating the heat transfer liquid in the coil pipe;   a controller configured to control whether the circulation pump circulates the heat transfer liquid based on the temperature detected by the first sensor; and   a heating device that absorbs heat from the heat transfer liquid transferred from the masonry heater, the heating device being a duct coil that heats air in a heating duct using the liquid transferred from the masonry heater.   
     
     
         33 . A heat transfer system comprising:
 a masonry heater;   a coil pipe extending into a firebox of the masonry heater through a first aperture in a wall of the firebox and exiting through a second aperture in the wall of the firebox, the coil pipe winding back and forth in the firebox and being disposed so as to be exposed to fire in the firebox, wherein a heat transfer liquid enters the coil pipe from a supply side of the coil pipe at the first hole aperture and the liquid exits the coil pipe from a return side of the coil pipe at the second hole aperture;   a first sensor disposed in a liquid return path on the return side of the coil pipe, the first sensor extending into the coil pipe where the coil pipe is directly exposed to heat within the firebox of the masonry heater, and the first sensor being configured to detect the temperature of the heat transfer liquid in the liquid return path, on the return side of the coil pipe;   a circulation pump configured to transfer the heat transfer liquid from the return path to an output of the heat transfer apparatus when the circulation pump is circulating the heat transfer liquid in the coil pipe, and stopping transfer of the heat transfer liquid to the output of the heat transfer apparatus when the circulation pump is not circulating the heat transfer liquid in the coil pipe; and   a controller configured to control whether the circulation pump circulates the heat transfer liquid based on the temperature detected by the first sensor; and   a heating device that absorbs heat from the heat transfer liquid transferred from the masonry heater, and   wherein the heating device is a low loss header.   
     
     
         34 . A heat transfer system comprising:
 a masonry heater;   a coil pipe extending into a firebox of the masonry heater through a first aperture in a wall of the firebox and exiting through a second aperture in the wall of the firebox, the coil pipe winding back and forth in the firebox and being disposed so as to be exposed to fire in the firebox, wherein a heat transfer liquid enters the coil pipe from a supply side of the coil pipe at the first hole aperture and the liquid exits the coil pipe from a return side of the coil pipe at the second hole aperture;   a first sensor disposed in a liquid return path on the return side of the coil pipe, the first sensor extending into the coil pipe where the coil pipe is directly exposed to heat within the firebox of the masonry heater, and the first sensor being configured to detect the temperature of the heat transfer liquid in the liquid return path, on the return side of the coil pipe;   a circulation pump configured to transfer the heat transfer liquid from the return path to an output of the heat transfer apparatus when the circulation pump is circulating the heat transfer liquid in the coil pipe, and stopping transfer of the heat transfer liquid to the output of the heat transfer apparatus when the circulation pump is not circulating the heat transfer liquid in the coil pipe; and   a controller configured to control whether the circulation pump circulates the heat transfer liquid based on the temperature detected by the first sensor; and   a heating device that absorbs heat from the heat transfer liquid transferred from the masonry heater, the heating device being a liquid heater that heats a second liquid using the heat transferred from the masonry heater, the liquid heater comprising a plate heat exchanger, wherein the liquid transferred from the masonry heater heats the plate heat exchanger, and the plate heat exchanger heats the second liquid, and   wherein the liquid heater further heats an oil heater.   
     
     
         35 . A heat transfer system comprising:
 a masonry heater;   a coil pipe extending into a firebox of the masonry heater through a first aperture in a wall of the firebox and exiting through a second aperture in the wall of the firebox, the coil pipe winding back and forth in the firebox and being disposed so as to be exposed to fire in the firebox, wherein a heat transfer liquid enters the coil pipe from a supply side of the coil pipe at the first hole aperture and the liquid exits the coil pipe from a return side of the coil pipe at the second hole aperture;   a first sensor disposed in a liquid return path on the return side of the coil pipe, the first sensor extending into the coil pipe where the coil pipe is directly exposed to heat within the firebox of the masonry heater, and the first sensor being configured to detect the temperature of the heat transfer liquid in the liquid return path, on the return side of the coil pipe;   a circulation pump configured to transfer the heat transfer liquid from the return path to an output of the heat transfer apparatus when the circulation pump is circulating the heat transfer liquid in the coil pipe, and stopping transfer of the heat transfer liquid to the output of the heat transfer apparatus when the circulation pump is not circulating the heat transfer liquid in the coil pipe;   a controller configured to control whether the circulation pump circulates the heat transfer liquid based on the temperature detected by the first sensor; and   a heating device that absorbs heat from the heat transfer liquid transferred from the masonry heater;   a circulation loop connected to the output of the heat transfer apparatus and the heating device; and   a secondary heat source connected to the circulation loop configured to transfer heat to the circulation loop, wherein the controller is configured to control the flow of the heat transfer liquid around the circulation loop and through the heat transfer apparatus, the secondary heat source and the heating device.