There is provided a system including: an automatic supplement valve configured to automatically supplementing direct water; an expansion tank configured to be connected to the automatic supplement valve to adjust expansion pressure depending on the temperature change of the direct water; an exhaust heat pump configured to be connected to the expansion tank to circulate heat in an exhaust heat line connecting the exhaust heat source and the hot water tank; and a mixing valve configured to be extendedly formed between a first hot water (1H) line for receiving the exhaust heat of the exhaust heat source and a second hot water (2H) line having passed through the exhaust heat exchanger of the hot water tank to mix the first hot water (1H) with the second hot water (2H).

System for controlling exhaust heat recovery temperature using mixing valve and method therefor

The present invention relates to a fuel cell system for generating power by an electrochemical reaction and a method thereof. The fuel cell system includes a fuel cell stack for generating direct current power by an electrochemical reaction of hydrogen and oxygen, a fuel process unit for reforming a power generation fuel into a hydrogen-included reformed gas to supply the reformed gas to the fuel cell stack, an oxygen supply unit for supplying oxygen to the fuel cell stack, a cooling unit for cooling the fuel cell stack, a temperature sensor for measuring a temperature inside the system case, a cooling water heater for heating cooling water flowing to the fuel cell stack, and a controller for controlling the cooling water heater and the fuel process unit according to a value obtained by the temperature sensor. In the fuel cell system and the method thereof, since the internal constituent elements are heated when an external temperature decreases below zero and a temperature of the system is reduced to be lower than a predetermined temperature, the fuel cell stack, the fuel process unit, the water tank in the cooling unit, and various pipes that include water may be prevented from being frozen, and therefore durability may increase.

Fuel cell system and operating method

A fuel cell system of an apartment house and a method for operating the fuel cell system are provided to improve operation efficiency by sensing the consumption amount of hydrogen and by controlling the generation amount of hydrogen. A fuel cell system comprises a fuel cell stack(5) which is installed in the each house of an apartment house and generates electricity and heat with hydrogen; a plurality of fuel converters(3) which are installed at a common equipment, reforms fuel to generate hydrogen, and supplies the generated hydrogen to several houses as a single supply module through a pipe; a controller(10) which is electrically connected with a sensor(11) sensing the operation load state of the fuel cell stack, and controls the operation the each fuel converter based on the sensed information; and a common conversion device(20) which receives the hydrogen generated excessively at the fuel converters through a pipe to generate common electricity and heat energy.

Fuel sell system of apartment house and control method thereof

A fuel cell cabinet liquid cooling system is provided. The fuel cell cabinet liquid cooling system includes a fuel cell, a liquid cooling system for dissipating heat generated by the fuel cell, and a controller that controls the liquid cooling system for maintaining a predetermined temperature range of a first cooling liquid of the fuel cell.

Electronics cabinet with liquid cooling system for backup power fuel cell

A fuel cell cabinet air feed and exhaust system is provided. The air feed and exhaust system includes a sealed air feed system that feeds air from outside a fuel cell cabinet to a fuel cell disposed inside the fuel cell cabinet, and a sealed air exhaust system that exhausts air from the fuel cell to the outside of the fuel cell cabinet. Each of the sealed air system and the sealed air exhaust system is sealed with respect to the fuel cell such that the sealed air system, the sealed air exhaust system, and the fuel cell form a sealed system.

Electronics cabinet with air feed and exhaust system for backup power fuel cell

The present invention relates to a fuel cell system, and to a cooling control method of the fuel cell system. The cooling control method of the fuel cell system includes measuring a voltage generated from the fuel cell stack in accordance with a time variation, and maintaining an internal temperature of the fuel cell stack at a predetermined value in accordance with the measured voltage. The method may further include controlling a cooling water temperature difference. Herein, when the measured voltage is equal to or greater than a predetermined value, the cooling water is normally supplied, and when the measured voltage is less than the predetermined value, a difference between cooling water inlet and outlet temperatures of the fuel cell stack is varied by a controller. The deterioration of the power generation performance due to the excessive moisture in the fuel cell stack can be prevented and thus the power generation can be effectively realized through the electrochemical reaction.

Hyung-Mok Cho

Papers

Fuel cell system and cooling control method thereof

Fuel cell system and operating method