System for producing heat source for heating or electricity using medium/low temperature waste heat, and method for controlling the same

A method for controlling a system for producing a heat source for heating or electricity, using medium- or low-temperature waste heat, the system comprising:

• an absorption-type heat pump that includes a generator, a condenser, an evaporator, and an absorber, is supplied with a driving heat source and heat source water to increase a temperature of a heat medium to a high temperature by means of absorption heat in the absorber and condensation heat in the condenser, and to discharges the heated heat medium;
• a regenerator heat exchange unit for supplying a regenerator with a driving heat source using medium- or low-temperature waste heat;
• an evaporator heat exchange unit for supplying an evaporator with heat source water;
• a heat medium circulation line of a closed loop structure for circulating a heat medium that is heated by passing through the absorber and the condenser;
• a generation unit branching off from the heat medium circulation line to undergo indirect heat exchange with the high-temperature heat medium and to drive a steam turbine on the basis of a Rankine cycle, thereby producing electricity;
• a heat production unit branching off from the heat medium circulation line to undergo indirect heat exchange with the high-temperature heat medium and to supply a heat-demanding place with a heat source for heating;
• and
• a switching valve unit provided on the heat medium circulation line to control the flow of the heat medium such that the heat medium is supplied to the generation unit or the heat production unit,
• the method comprising:
• switching the switching valve unit according to heat source demand of the heat-demanding place, thereby supplying the heat-demanding place with the heat source for heating by means of the heat production unit, when the heat source demand is higher than preset heat source demand but producing electricity by means of the generation unit when the heat source demand is equal to or lower than the preset heat source demand.