Heat source system, control device thereof, and control method thereof

Abstract

A technique of suppressing power consumption of a system so as to be equal to or less than contracted power when a refrigerator is used as a heat source is provided. A system control device ( 20 ) includes a power monitoring unit ( 23 ) that monitors power consumption of a heat source system and a demand restricting unit ( 24 ). The demand restricting unit ( 24 ) performs demand restriction by raising or lowering a set temperature so as to decrease power consumption of heat source equipment when the power consumption of the heat source system is greater than a first power threshold value set to a value lower than the contracted power.

1 . A control device of a heat source system having at least one piece of heat source equipment that heats or cools heat source water depending on a set temperature and that supplies the heated or cooled heat source water to load equipment, comprising:
 power monitoring means for monitoring power consumption of the heat source system; and   demand restricting means for performing demand restriction by raising or lowering the set temperature so as to decrease power consumption of the heat source equipment when the power consumption of the heat source system is greater than a first power threshold value set to a value lower than that of contracted power.   
     
     
         2 . The control device of a heat source system according to  claim 1 , wherein the demand restricting means lowers or raises the set temperature so as to increase the power consumption of the heat source equipment when the power consumption of the heat source system is less than a second power threshold value set to a value equal to or less than the first power threshold value, and maintains the set temperature when a current set temperature reaches a predetermined reference set temperature. 
     
     
         3 . The control device of a heat source system according to  claim 1 , wherein the demand restricting means lowers the set temperature so as not to be less than a predetermined lower limit value when the heat source equipment heats the heat source water, and raises the set temperature so as not to be greater than a predetermined upper limit value when the heat source equipment cools the heat source water. 
     
     
         4 . The control device of a heat source system according to  claim 1 , further comprising demand restriction stopping means for stopping the demand restriction by the demand restricting means. 
     
     
         5 . The control device of a heat source system according to  claim 1 , further comprising electrical water supply means for adjusting a flow rate of the heat source water supplied from an external apparatus to the heat source equipment,
 wherein the demand restricting means holds a rotation speed of the water supply means in a period in which the power consumption of the heat source system is greater than the first power threshold value.   
     
     
         6 . The control device of a heat source system according to  claim 1 , wherein the demand restricting means stops an operation of predetermined heat source equipment when the power consumption of the heat source system is greater than a third power threshold value set to a value greater than the first power threshold value and lower than the contracted power. 
     
     
         7 . The control device of a heat source system according to  claim 1 , wherein the demand restricting means performs a control of reducing power consumption of an electrical instrument of the load equipment in a period in which the power consumption of the heat source system is greater than the first power threshold value. 
     
     
         8 . The control device of a heat source system according to  claim 1 , further comprising power predicting means for predicting future power consumption from behavior of the power consumption of the heat source system in a predetermined previous period,
 wherein the demand restricting means starts the demand restriction when the predicted power consumption after a predetermined period passes from the present time is greater than the first power threshold value.   
     
     
         9 . A control method of a heat source system having at least one piece of heat source equipment that heats or cools heat source water depending on a set temperature and that supplies the heated or cooled heat source water to load equipment, comprising:
 monitoring power consumption of the heat source system; and   performing demand restriction by raising or lowering the set temperature so as to decrease power consumption of the heat source equipment when the power consumption of the heat source system is greater than a first power threshold value set to a value lower than that of contracted power.   
     
     
         10 . A heat source system comprising the control device of a heat source system according to  claim 1 . 
     
     
         11 . A heat source system having at least one piece of heat source equipment that heats or cools heat source water depending on a set temperature and that supplies the heated or cooled heat source water to load equipment, comprising:
 heat source equipment control means that is disposed to correspond to the at least one piece of heat source equipment so as to control the corresponding heat source equipment; and   system control means for giving a control command to the heat source equipment control means,   wherein the system control means includes
 power monitoring means for monitoring power consumption of the heat source system, and 
 notification means for giving a demand restriction start command to the heat source equipment control means when the power consumption of the heat source system is greater than a first power threshold value set to a value lower than that of contracted power, and 
   wherein the heat source equipment control means includes demand restricting means for performing demand restriction by raising or lowering the set temperature so as to decrease the power consumption when the demand restriction start command is given.   
     
     
         12 . A power adjustment network system comprising:
 a plurality of heat source systems according to  claim 10 ; and   a central monitor device that is connected to control devices of the heat source systems via communication medium,   wherein the first power threshold value is given from the central monitor device to the control devices of the heat source systems.   
     
     
         13 . A control device of heat source equipment that heats or cools heat source water depending on a set temperature and that supplies the heated or cooled heat source water to load equipment, comprising:
 power monitoring means for monitoring power consumption of the heat source equipment; and   demand restricting means for performing demand restriction by raising or lowering the set temperature so as to decrease the power consumption of the heat source equipment when the power consumption of the heat source equipment is greater than a first power threshold value set to a value lower than that of contracted power.