摘要:
The need for manual adjustment of a number-of-devices controller when a system is installed or when a new heat source device is added is eliminated, and operation with a high coefficient of performance is possible even when the temperature of a heat-source medium changes. A heat source system (1) includes a plurality of heat source devices (3) that are used as hot-water heat pumps and are connected in parallel with each other, heat-source-device controllers (9) provided for the respective heat source devices (3), and a number-of-devices controller (10) that allocates a hot-water load corresponding to a demand hot-water load to each heat source device (3). Each heat-source-device controller (9) transmits, to the number-of-devices controller (10), a maximum hot-water load that can be handled in the current operating condition, including the temperature of heat-source water, and heat-source-device information indicating an optimal operating range, which is a load range in which a COP of the corresponding heat source device (3) to be controlled becomes higher than or equal to a predetermined value. Then, the number-of-devices controller (10) controls the number of operated devices and performs the hot-water-load allocation based on the heat-source-device information transmitted from each heat-source-device controller (9) so that the corresponding heat source device (3) operates within the optimal operating range.
摘要:
Abstract: In this heat source control device, heat source system, and heat source control method, provided are heat source groups (10, 20), a plurality of group control units (11, 21), and a unit-quantity control unit (30). The group control units (11, 21) have a first operational range output unit and a second operational range output unit, and when a requested load exceeds a first appropriate operation range, the unit-quantity control unit (30) controls the group control units (11, 21) in a manner such that the startup quantity of the heat source groups (10, 20) is increased and the startup quantity of heat source units (12, 22) becomes a predetermined unit quantity.
摘要:
It is possible to realize flow rate control regardless of the scale on a load side or a piping system and to achieve energy saving. In a host control device (20) of a heat source system, a bypass valve opening command value is determined by an opening command value determination unit (22) such that a header differential pressure matches a target differential pressure value, and a target opening value according to the header differential pressure or the behavior of the bypass valve opening is set by a target opening value setting unit (24). A heating medium flow rate set value is determined by a heating medium flow rate setting unit (23) using the target opening value set by the target opening value setting unit (24) and the opening command value determined by the opening command value determination unit (22).
摘要:
Provided is a heat source system that includes two heat source devices connected in series to a heat medium and can be efficiently operated. A heat source system (1) reduces the temperature of chilled water that is guided from a cooling load and has a predetermined return temperature Tr, to a predetermined supply temperature Ts, and supplies the chilled water to the cooling load. The heat source system (1) includes: a second centrifugal chiller (TR2) that reduces the temperature of the chilled water from the return temperature Tr to an intermediate temperature T2; a first centrifugal chiller (TR1) that reduces the temperature of the chilled water that has been reduced to the intermediate temperature T2 by the second centrifugal chiller (TR2), to the supply temperature Ts; and a control unit (9) that variably sets the intermediate temperature T2.
摘要:
A chiller control apparatus increases or decreases chillers in order to efficiently operate an entire chiller system. When the number of chillers increases, an insufficient load value calculation unit calculates an insufficient amount of a load for a required load. Then, using a COP obtained according to an operating environment of the chiller, a chiller-to-be-operated selection unit selects, from among stopped chillers, a chiller having the highest COP when operated with an insufficient amount of a load, as the chiller to be subjected to stage increase. Further, when the number of chillers decreases, an operation pattern extraction unit extracts operation patterns that are combinations of chillers to be operated according to the required load. Then, a chiller-to-be-stopped selection unit obtains a COP of the entire chiller system for each operation pattern, using the COP obtained according to the operating environment of the chiller, and selects a chiller subjected to stage decrease based on the operation pattern corresponding to the highest COP.
摘要:
The purpose of the present invention is to maintain a water supply temperature close to a target water supply temperature at the time of a change in the number of heat source machines operating. A heat source system of the present invention anticipates a case where a prescribed minimum flow rate is set for heat source machines that are subject to addition or removal, and calculates, as compensation temperatures, hot and cold water outlet temperatures of the heat source machines so that the water supply temperature in such a case will match a target water supply temperature (SA2), and changes the hot and cold water outlet temperature settings of the operating heat source machines to the compensation temperatures (SA4). After that, the heat source machines that are subject to addition or removal are either started up or stopped (SA6), and the set flow rate for the heat source machines that are subject to addition or removal is set to the minimum flow rate (SA7).
摘要:
An object of the invention is to prevent the start and stop of heat source machines from being frequently repeated. Whether or not basic conditions for decreasing the number of machines are satisfied when the number of currently operating machines is increased by one is determined if a current operational status satisfies basic conditions for increasing the number of machines, and one heat source machine is started if it is determined that the basic conditions for decreasing the number of machines are not satisfied. Additionally, whether or not the basic conditions for increasing the number of machines are satisfied when the number of currently operating machines is decreased by one are satisfied if a current operational status satisfies the basic conditions for decreasing the number of machines, and one heat source machine is stopped if it is determined that the basic conditions for increasing the number of machines are not satisfied.