Mitsubishi Heavy Industries Thermal Systems, Ltd.

Mitsubishi Heavy Industries Limited

Tokyo Electric Power Company Holdings, Inc.

Satoshi Nikaido

Minoru Matsuo

Koki Tateishi

Toshiaki Ouchi

Yusuke Hazui

Yutaka Takenaka

Kenji Ueda

Satoru Tanaka

Yoshie Togano

Katsuya Sakaguchi

Masanobu Sakai

Kazuki Wajima

Akimasa Yokoyama

Takeshi Fuchimoto

Takaaki Miura

Noriyasu Maehara

Hirotaka Hanasaki

The purpose of the invention is to provide a control device that can calculate the lower limit of cooling water inlet temperature according to the operation status of a chiller. A control device comprises: a lower limit calculation unit that calculates the lower limit of cooling water outlet temperature, where a prescribed required temperature difference is added to the cooling water outlet temperature of a chiller, and an inlet-outlet required temperature difference, which is the difference between the cooling water outlet temperature and the cooling water inlet temperature in the chiller and which is generated according to the operation status of the chiller, and that calculates a cooling water inlet temperature lower limit calculated value for the chiller by subtracting the inlet-outlet required temperature difference from the cooling water outlet temperature lower limit value; and a lower limit value determination unit that fixes the cooling water inlet temperature lower limit calculated value as the cooling water inlet temperature lower limit value.

Control device, heat source system, method for calculating lower limit of cooling water inlet temperature, control method, and program

A control device for a refrigerator system for cooling a load by using a plurality of refrigerators, said control device comprising a unit to control the number of operating units that changes the number of operating refrigerators according to the load rate, and a cold water temperature acquisition unit that acquires, via a temperature sensor, the temperature of cold water affected by the refrigerators. After a prescribed standby time from when the number of operating refrigerators was changed has elapsed, the unit to control the number of operating units changes the number of operating units and reduces the prescribed standby time when at least one of the cold-water temperature and the rate of change in the cold-water temperature satisfies a prescribed condition.

Controller and method for reducing standby time when controlling the number of chillers to be operated

A superordinate controlling device for a heat source system () including a plurality of heat sources, the superordinate controlling device being applied to the heat source system () and controlling heat-pump type chillers () and () and absorption-type chillers () and () in such a manner that a heat transfer medium leaving temperature that is the temperature of a heat transfer medium supplied to an external load () is equal to a setting temperature. The heat-pump type chillers () and () each have a higher Coefficient of Performance (COP) than that of each of the absorption-type chillers () and (). The superordinate controlling device includes a heat transfer medium leaving temperature changing means for carrying out heat transfer medium leaving temperature control, by changing the heat transfer medium leaving temperatures of the heat-pump type chillers () and (), when a post-change prediction value of each of the absorption-type chiller () and () predicted based on a supposition that the heat transfer medium leaving temperatures of the heat-pump type chillers () and () are changed exceeds a second underload stop threshold value at which the corresponding one of the absorption-type chiller () and () would have an underload stop.

Heat source system controlling device, heat source system, heat source system controlling method, and heat source system controlling program

Provided is a refrigerator system with which refrigerators can be operated efficiently. This refrigerator system has: an upstream refrigerator having a first compressor that compresses a refrigerant, a first condenser that condenses the refrigerant compressed by the first compressor, and a first evaporator that evaporates the refrigerant condensed by the first condenser and cools cold water; a downstream refrigerator having a second compressor that compresses a refrigerant, a second condenser that condenses the refrigerant compressed by the second compressor, and a second evaporator that evaporates the refrigerant condensed by the second condenser and cools the cold water that has passed through the first evaporator; and a higher-level control device that controls the operation of the upstream refrigerator and the downstream refrigerator. The first compressor is a variable-speed device, and the second compressor is a constant-speed device.

Refrigerator system

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, and changes the hot and cold water outlet temperature settings of the operating heat source machines to the compensation temperatures. After that, the heat source machines that are subject to addition or removal are either started up or stopped, and the set flow rate for the heat source machines that are subject to addition or removal is set to the minimum flow rate.

Heat source system and control method therefor

A controller for controlling a number of operating heat sources is provided. The controller detects a change in a number of secondary pumps that supply a heat transfer medium to a load device, determines the number of operating heat sources that changes as a load demand of the state of a load device changes, and switches the number of operating heat sources. The controller determines the number of operating heat sources when the change in the number of secondary pumps due to the change in the load demand is detected, and changes the number of heat sources for as long as at least one of a prescribed period has passed from a time when the change in the number of secondary pumps is detected or a prescribed condition with respect to a value that varies due to the change in the number of secondary pumps is satisfied.

Device for controlling number of operating heat source devices, heat source system, control method, and program

A machine quantity controlling device which controls a quantity of a heat source device to operate in a heat source system including a first heat source device and a second heat source device, the first heat source device being a waste heat recovery type absorption chiller, the second heat source device other than a waste heat recovery type absorption chiller, the machine quantity controlling device including an acquisition unit that obtains a waste heat utilization maximum load which is a maximum load when the first heat source device receives only supply of the waste heat; a determination unit that determines a predetermined load range from the waste heat utilization maximum load to be a first optimal load range as an optimal load range of the first heat source device; and a machine quantity control unit that controls a quantity of the second heat source device to operate so that the sum of a total of minimum values of the optimal load range of the first heat source device to operate and a total of minimum values of a second optimal load range of the second heat source device to operate is smaller than or equal to a load required for the heat source system, and the sum of a total of maximum values of a first optimal load range and a total of maximum values of the second optimal load range is equal to or greater than the load required for the heat source system, the second optimal load range being an optimal load range of the second heat source device to operate.

Machine quantity controlling device, energy supplying system, machine quantity controlling method, and program

Provided is a heat pump system that can appropriately manage the number of heat pumps in operation even when any of the heat pumps is defrosting, and that can always operate at a capacity that corresponds to a load. Also provided is an operation method for the heat pump system. A heat pump system () wherein a plurality of heat pumps (A-C (A-D)) are connected to a system load and wherein a system management unit () successively calculates the capacity that can be output by the heat pumps (A-C (A-D)) in operation, compares the calculated capacity value, as a threshold value, to the thermal load of the system load, and manages the number of heat pumps (A-C (A-D)) in operation.

Heat pump system and operation method therefor

The purpose of the present invention is to avoid frequent repetition of an increase/decrease stage caused by the inclusion, in a heat source system, of a machine the capacity of which has been degraded. A heat source system of the present invention is provided with a plurality of heat source machines. A higher-level control device () controls each of the heat source machines so that a heat medium delivery temperature, which is the temperature of a heat medium being supplied to an external load, will be a set temperature. The higher-level control device () is provided with a number-of-machines control unit (), a degraded machine detection unit (), and a priority ranking modification unit (). The number-of-machines control unit () controls the number of heat source machines in accordance with operational priority ranking information in which each of the heat source machines and an operational priority ranking are associated together. The degraded machine detection unit () detects, as a capacity-degraded machine, a heat source machine that satisfies a predetermined capacity degradation condition, from among operating heat source machines. The priority ranking modification unit (), if a capacity-degraded machine has been detected, modifies to a lowest position the operational priority ranking of the capacity-degraded machine in the operational priority ranking information.

Heat source system, and control device and control method therefor

In order to achieve a reduction in energy consumption in a cooling water supply device without using a database, an equipment control device () of a cooling water supply device: uses the load of a chiller, and a cooling water outlet temperature lower limit setpoint determined in accordance with the set temperature for the cooling water outlet of the chiller, to set a cooling water inlet temperature lower limit setpoint; sets, as the cooling water inlet temperature setpoint, the higher of the lower limit setpoint and the cooling water inlet temperature lower limit value as determined from the outside wet-bulb temperature; and generates a control command for a cooling tower fan and a control command for the cooling water flow volume, so as to match the cooling water inlet temperature and the cooling water outlet temperature respectively with the cooling water inlet temperature setpoint and the cooling water outlet temperature lower limit setpoint which have been set.

Heat source system, and device and method for controlling cooling water supply device

To swiftly start, at the time of power recovery after a power failure, heat source machines, the number of which is equal to the number of machines before the power failure, without including an uninterruptible power supply in an apparatus for controlling the number of machines that is adapted to control the number of heat source machines. There is provided a heat source system, in which a host control device () includes a nonvolatile first storage unit () that stores the number of heat source machines in operation immediately before the power failure. When power is recovered, control on the number of heat source machines at the time of power recovery is performed in accordance with the number of heat source machines stored in the first storage unit ().

Heat source system and method for controlling number of machines to be started at time of power recovery in heat source system

To achieve energy saving in the cooling towers as a whole in a heat source system including a plurality of cooling towers connected in parallel to a common chiller. In a heat source system, a plurality of cooling towers are connected in parallel to a common chiller. The cooling towers cool cooling water used and thereby heated in the chiller, and supplies the cooled cooling water to the chiller. A cooling tower control device for controlling the cooling towers starts all the cooling towers at the start of the heat source system.

Device and method of controlling cooling towers, and heat source system

A control device and method for preventing the start and stop of heat source machines from being frequently repeated. The control device determining 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, and determining 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.

Number-of-machines control device for heat source system, method therefor, and heat source system

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 () of a heat source system, a bypass valve opening command value is determined by an opening command value determination unit () 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 (). A heating medium flow rate set value is determined by a heating medium flow rate setting unit () using the target opening value set by the target opening value setting unit () and the opening command value determined by the opening command value determination unit ().

Heat source system and method of controlling flow rate of heating medium thereof

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 () 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 () includes: a second centrifugal chiller (TR) that reduces the temperature of the chilled water from the return temperature Tr to an intermediate temperature T; a first centrifugal chiller (TR) that reduces the temperature of the chilled water that has been reduced to the intermediate temperature Tby the second centrifugal chiller (TR), to the supply temperature Ts; and a control unit () that variably sets the intermediate temperature T

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Tokyo, Japan

Satoshi Nikaido