EP2778555B1 - Warm water heating system, control device and control method - Google Patents

Warm water heating system, control device and control method Download PDF

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Publication number
EP2778555B1
EP2778555B1 EP12847838.5A EP12847838A EP2778555B1 EP 2778555 B1 EP2778555 B1 EP 2778555B1 EP 12847838 A EP12847838 A EP 12847838A EP 2778555 B1 EP2778555 B1 EP 2778555B1
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EP
European Patent Office
Prior art keywords
water
temperature
heating portion
heating
heat
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Not-in-force
Application number
EP12847838.5A
Other languages
German (de)
English (en)
French (fr)
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EP2778555A4 (en
EP2778555A1 (en
Inventor
Hitoi Ono
Noriyuki Matsukura
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mitsubishi Heavy Industries Thermal Systems Ltd
Original Assignee
Mitsubishi Heavy Industries Thermal Systems Ltd
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Publication date
Application filed by Mitsubishi Heavy Industries Thermal Systems Ltd filed Critical Mitsubishi Heavy Industries Thermal Systems Ltd
Publication of EP2778555A1 publication Critical patent/EP2778555A1/en
Publication of EP2778555A4 publication Critical patent/EP2778555A4/en
Application granted granted Critical
Publication of EP2778555B1 publication Critical patent/EP2778555B1/en
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Anticipated expiration legal-status Critical

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H4/00—Fluid heaters characterised by the use of heat pumps
    • F24H4/02—Water heaters
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H15/00—Control of fluid heaters
    • F24H15/10—Control of fluid heaters characterised by the purpose of the control
    • F24H15/174—Supplying heated water with desired temperature or desired range of temperature
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H9/00—Details
    • F24H9/20—Arrangement or mounting of control or safety devices
    • F24H9/2007—Arrangement or mounting of control or safety devices for water heaters
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H15/00—Control of fluid heaters
    • F24H15/20—Control of fluid heaters characterised by control inputs
    • F24H15/227—Temperature of the refrigerant in heat pump cycles
    • F24H15/232—Temperature of the refrigerant in heat pump cycles at the condenser
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H15/00—Control of fluid heaters
    • F24H15/30—Control of fluid heaters characterised by control outputs; characterised by the components to be controlled
    • F24H15/375—Control of heat pumps
    • F24H15/38—Control of compressors of heat pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H15/00—Control of fluid heaters
    • F24H15/40—Control of fluid heaters characterised by the type of controllers
    • F24H15/414—Control of fluid heaters characterised by the type of controllers using electronic processing, e.g. computer-based
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2339/00—Details of evaporators; Details of condensers
    • F25B2339/04—Details of condensers
    • F25B2339/047—Water-cooled condensers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2600/00—Control issues
    • F25B2600/25—Control of valves
    • F25B2600/2515—Flow valves

Definitions

  • the present invention relates to a warm water heating system which heats warm water using a heat output heat exchanger provided in a heat pump, and a control device and a control method of the warm water heating system.
  • a warm water system which supplies warm water includes a heat storage tank.
  • temperature control is performed by some water stored in this heat storage tank obtaining heat from a heat output heat exchanger provided in a main body of the warm water heat pump (e.g., see Patent Literature 1).
  • Patent Literature 1 there is a problem in that installation cost or an installation space increase since the heat storage tank is provided in the warm water system. Further, there is a problem in that it takes time to increase a temperature since the water stored in the heat storage tank is circulated to the heat output heat exchanger to increase the water temperature in the heat storage tank.
  • Patent Literature 2 a method of providing a three-way valve in a warm water system to circulate a part of output of warm water from a heat output heat exchanger to the heat output heat exchanger and perform control so that a temperature of an entrance of the heat output heat exchanger becomes a predetermined target temperature is described in Patent Literature 2.
  • a temperature increase rate of the warm water system can be increased using this method.
  • a control device according to the preamble of claim 1 and a control method according to the preamble of claim 9 are known from document WO 2011/108392 .
  • a three-way valve is fully opened and entire output of warm water from a heat output heat exchanger is likely to be circulated when a warm water system is in a transient state, such as at the time of start-up of the heat pump, i.e., when a water temperature of the entire warm water system is lower than a target temperature.
  • a water temperature of the warm water system rapidly increases and a temperature of an entrance of the heat output heat exchanger reaches a target temperature, an opening degree of the three-way valve changes for the first time.
  • the present invention provides a warm water heating system, a control device and a control method which appropriately controls a temperature increase rate in a transient state of a warm water system.
  • the present invention provides a control device used to control a warm water heating system, the control device including: a heat pump including a heat output heat exchanger which takes heat from a heat source system and outputs heat; a heating portion which heats water using the heat obtained from the heat output heat exchanger; an outflow portion which flows the water heated by the heating portion to a heating target; a circulation portion which circulates the water heated by the heating portion to an upstream side of the heating portion; an inflow portion which flows water from the heating target into the upstream side of the heating portion; and an adjustment unit which adjusts flow amount distribution of the water from the heating portion to the outflow portion and the circulation portion, wherein the control device includes an upstream-side target temperature setting unit which sets a target temperature of the water on the upstream side of the heating portion; and an adjustment amount determination unit which determines an adjustment amount of the flow amount distribution by the adjustment unit so that a temperature of the water on the upstream side of the heating portion increases by a predetermined temperature until the temperature of the water on the upstream side of the heating portion
  • the present invention provides for the adjustment amount determination unit to determine the adjustment amount of the flow amount distribution by the adjustment unit so that the temperature of the water on the upstream side of the heating portion increases by a predetermined temperature calculated based on states of water flowing in the heating portion, water circulated by the circulation portion, and water flowing from the inflow portion into the upstream side of the heating portion until the temperature of the water on the upstream side of the heating portion reaches the target temperature.
  • an adjustment temperature calculation unit which calculates, as an adjustment temperature used for determination of the adjustment amount, a temperature difference between a temperature of water obtained by mixing water flowing from the inflow portion into the upstream side of the heating portion with water circulated by the circulation portion and a temperature of the water flowing in the heating portion based on the states of the water flowing in the heating portion, the water circulated by the circulation portion, and the water flowing from the inflow portion into the upstream side of the heating portion.
  • the adjustment amount determination unit determines the adjustment amount of the flow amount distribution by the adjustment unit so that the temperature of the water on the upstream side of the heating portion increases by the adjustment temperature calculated by the adjustment temperature calculation unit until the temperature of the water on the upstream side of the heating portion reaches the target temperature.
  • the adjustment amount determination unit determines the adjustment amount of the flow amount distribution by the adjustment unit so that the temperature of the water flowing into the heating portion becomes constant until the heat pump operates.
  • the upstream-side target temperature setting unit prefferably set a target temperature of the water on the upstream side of the heating portion based on a maximum heating amount in the heating portion, a flow amount of the water flowing into the heating portion, and a target temperature of the water on a downstream side of the heating portion.
  • a downstream-side target temperature setting unit which sets the target temperature of the water on the downstream side of the heating portion; and a heat pump adjustment amount determination unit which determines an adjustment amount of heat pump control so that the temperature of the water on the downstream side of the heating portion increases by a predetermined temperature until the temperature of the water on the downstream side of the heating portion reaches the target temperature.
  • the heat pump adjustment amount determination unit determines the adjustment amount of the heat pump control so that the temperature of the water on the downstream side of the heating portion increases by a predetermined temperature calculated based on a state of the water flowing in the heating portion and flowing from the heating portion into the adjustment unit, and a heating amount in the heating portion until the temperature of the water on the downstream side of the heating portion reaches the target temperature.
  • a heat pump adjustment temperature calculation unit which calculates, as a heat pump adjustment temperature used for determination of the adjustment amount of the heat pump control, the temperature difference between the temperature of the water flowing in the heating portion when the water is heated by the heating portion and the temperature of the water flowing from the heating portion into the adjustment unit, based on the state of the water flowing in the heating portion and the state of the water flowing from the heating portion into the adjustment unit, and a heating amount in the heating portion.
  • the heat pump adjustment amount determination unit determines the adjustment amount of the heat pump control so that the temperature of the water on the downstream side of the heating portion increases by the heat pump adjustment temperature calculated by the heat pump adjustment temperature calculation unit until the temperature of the water on the downstream side of the heating portion reaches the target temperature.
  • the present invention provides a control device used to control a warm water heating system including: a heat pump including a heat output heat exchanger which takes heat from a heat source system and outputs heat; a heating portion which heats water using the heat obtained from the heat output heat exchanger; an outflow portion which flows the water heated by the heating portion to a heating target; a circulation portion which circulates the water heated by the heating portion to an upstream side of the heating portion; an inflow portion which flows water from the heating target into the upstream side of the heating portion, a downstream-side target temperature setting unit which sets a target temperature of the water on a downstream side of the heating portion; and a heat pump adjustment amount determination unit which determines an adjustment amount of heat pump control so that a temperature of the water on the downstream side of the heating portion increases by a predetermined temperature until the temperature of the water on the downstream side of the heating portion reaches the target temperature.
  • a heat pump including a heat output heat exchanger which takes heat from a heat source system and outputs heat; a heating portion which heats
  • the present invention provides for the heat pump adjustment amount determination unit to determine the adjustment amount of the heat pump control so that the temperature of the water on the downstream side of the heating portion increases by a predetermined temperature calculated based on the state of water flowing in the heating portion and the state of water flowing from the heating portion and a heating amount in the heating portion until the temperature of the water on the downstream side of the heating portion reaches the target temperature.
  • a heat pump adjustment temperature calculation unit which calculates, as a heat pump adjustment temperature used for determination of the adjustment amount of the heat pump control, the temperature difference between the temperature of the water flowing in the heating portion when the water is heated by the heating portion and the temperature of the water flowing from the heating portion based on the state of the water flowing in the heating portion and the state of the water flowing from the heating portion and the heating amount in the heating portion, and it is preferable for the heat pump adjustment amount determination unit to determine the adjustment amount of the heat pump control so that the temperature of the water on the downstream side of the heating portion increases by the heat pump adjustment temperature calculated by the heat pump adjustment temperature calculation unit until the temperature of the water on the downstream side of the heating portion reaches the target temperature.
  • the adjustment amount of the adjustment unit or the adjustment amount of the heat pump is determined so that the temperature of the warm water on the upstream side or the downstream side of the heating portion increases by a predetermined temperature until the temperature of the warm water on the upstream side of the heating portion reaches the target temperature. Accordingly, it is possible to appropriately control the temperature increase rate in the transient state of the warm water system.
  • Fig. 1 is a schematic configuration diagram of a warm water heating system according to a first embodiment of the present invention.
  • the warm water heating system includes a heat pump 20 which takes heat from a heat source system 10 and outputs heat, a warm water system 30 which heats water using the heat output from the heat pump 20, and a control device 40 which controls the warm water system 30.
  • the heat pump 20 includes a pipe filled with a heat medium, and an evaporator 21, a compressor 22, a condenser 24 (a heat output heat exchanger), and an expansion valve 25 which are connected to the pipe.
  • the evaporator 21 increases a temperature of the heat medium using the heat output from the heat source system 10.
  • the compressor 22 compresses and liquefies the heat medium whose temperature is increased by the evaporator 21.
  • a vane 23 adjusts a flow amount of the heat medium liquefied by the compressor 22.
  • the condenser 24 supplies heat of the heat medium flowing from the vane 23 to the warm water system 30.
  • the expansion valve 25 depressurizes and vaporizes the heat medium whose temperature is decreased by the condenser 24.
  • the warm water system 30 is configured of an inflow portion 31, a circulation pump 32, a heating portion 33, a three-way valve 34 (adjustment portion), a circulation portion 35, and an outflow portion 36.
  • the inflow portion 31 flows water from a heating target into the heating portion 33 through the circulation pump 32.
  • the circulation pump 32 pumps the inflow water to the heating portion 33.
  • the heating portion 33 heats the inflow water from the circulation pump 32 using the heat supplied from the condenser 24 and supplies the heated water to the three-way valve 34.
  • the three-way valve 34 flows a part of the water heated by the heating portion 33 into the circulation portion 35 and flows the remainder into the outflow portion 36 according to its opening degree (flow amount distribution).
  • the circulation portion 35 circulates the water from the three-way valve 34 to the heating portion 33 through the circulation pump 32.
  • the outflow portion 36 flows the water from the three-way valve 34 to the heating target.
  • an inflow portion flow amount detector 51 an inflow portion temperature detector 52, a heating portion flow amount detector 53, a heating portion upstream-side temperature detector 54, and a heating portion downstream-side temperature detector 55 are provided in the warm water system 30.
  • the inflow portion flow amount detector 51 detects a flow amount F 1 of the water flowing through the inflow portion 31.
  • the inflow portion temperature detector 52 detects a temperature T 1 of the water flowing through the inflow portion 31.
  • the heating portion flow amount detector 53 detects a flow amount F 2 of the water flowing through the heating portion 33.
  • the heating portion upstream-side temperature detector 54 detects a temperature of the water on an upstream side of the heating portion 33. In other words, the heating portion upstream-side temperature detector 54 detects a temperature T 2 of the water before the water is heated in the heating portion 33.
  • the heating portion downstream-side temperature detector 55 detects a temperature of the water on a downstream side of the heating portion 33. In other words, the heating portion downstream-side temperature detector 55 detects a temperature T 3 of the water after the water is heated in the heating portion 33.
  • Fig. 2 is a schematic block diagram showing a configuration of the control device 40 according to the first embodiment of the present invention.
  • the control device 40 includes a sensor information acquisition unit 401, an upstream-side temperature change rate calculation unit 402 (an adjustment temperature calculation unit), an upstream-side target temperature setting unit 403, a heat pump information input unit 404, an upstream-side immediate target temperature setting unit 405, and a three-way valve control unit 406 (an adjustment amount determination unit).
  • the sensor information acquisition unit 401 acquires sensor information (a flow amount or a temperature) detected by each detector provided in the warm water system 30.
  • the upstream-side temperature change rate calculation unit 402 calculates the change rate (adjustment temperature) of the water temperature on the upstream side of the heating portion 33, i.e., an increase rate of the water temperature based on the sensor information acquired by the sensor information acquisition unit 401.
  • the change rate of the water temperature is calculated by applying the sensor information to a heat balance model.
  • the upstream-side target temperature setting unit 403 sets a target temperature of the water on the upstream side of the heating portion 33 when the warm water system 30 enters a steady state if the heat pump 20 and the warm water system 30 operate.
  • the heat pump information input unit 404 receives input of heat pump information indicating whether the compressor 22 of the heat pump 20 has started operation.
  • the upstream-side immediate target temperature setting unit 405 sets the immediate target temperature of the water on the upstream-side of the heating portion 33 at a current time according to the information acquired from the sensor information acquisition unit 401, the upstream-side temperature change rate calculation unit 402, the upstream-side target temperature setting unit 403 and the heat pump information input unit 404. Specifically, the upstream-side immediate target temperature setting unit 405 sets the current water temperature on the upstream side of the heating portion 33 as the immediate target temperature in a state in which the compressor 22 of the heat pump 20 does not operate. In other words, the upstream-side immediate target temperature setting unit 405 sets the immediate target temperature to preserve the current water temperature.
  • the upstream-side immediate target temperature setting unit 405 sets the immediate target temperature based on the temperature change rate calculated by the upstream-side temperature change rate calculation unit 402 until the current water temperature on the upstream side of the heating portion 33 reaches the upstream-side target temperature after the compressor 22 operates. Also, the upstream-side immediate target temperature setting unit 405 sets the target temperature set by the upstream-side target temperature setting unit 403 as the immediate target temperature after the current water temperature on the upstream side of the heating portion 33 has reached the upstream-side target temperature.
  • the three-way valve control unit 406 performs control of an opening degree of the three-way valve 34 under PID (Proportional/Integral/Differential) control based on the immediate target temperature set by the upstream-side immediate target temperature setting unit 405 and the current water temperature on the upstream side of the current heating portion 33.
  • PID Proportional/Integral/Differential
  • control device 40 operation of the control device 40 at the time of operation start of the warm water heating system according to the present embodiment will be described.
  • Fig. 3 is a flowchart showing operation of the control device 40 according to the first embodiment of the present invention.
  • the upstream-side target temperature setting unit 403 of the control device 40 receives input of a target temperature T 2d on the upstream side of the heating portion 33 from a manager before operation start of the warm water heating system (step S1).
  • the manager of the warm water heating system operates the warm water system 30 after the setting of the target temperature.
  • the upstream-side immediate target temperature setting unit 405 determines whether the heat pump information received as input by the heat pump information input unit 404 indicates operation start of the compressor 22 (step S2).
  • the heat pump information indicates the operation start of the compressor 22 when the manager of the warm water heating system operates the compressor 22.
  • the upstream-side immediate target temperature setting unit 405 determines that the heat pump information indicates that the compressor 22 has not yet operated (step S2: NO)
  • the upstream-side immediate target temperature setting unit 405 acquires a temperature T 2 detected by the heating portion upstream-side temperature detector 54 from the sensor information acquisition unit 401 and sets the temperature T 2 , i.e., the water temperature on the upstream-side of the heating portion 33, as the immediate target temperature T 2a (step S3).
  • the three-way valve control unit 406 determines the opening degree so that the water temperature on the upstream side of the heating portion 33 becomes constant as the immediate target temperature T 2a , i.e., the current temperature T 2 , and controls the three-way valve 34 based on the opening degree (step S4). In other words, the three-way valve control unit 406 controls the opening degree of the three-way valve 34 so that the water for dissipating generated heat by the circulation pump 32 flows from the inflow portion 31.
  • the three-way valve 34 is adjusted with a small closing degree from full opening with respect to the circulation portion 35, i.e., a small opening degree with respect to the outflow portion 36, until the compressor 22 operates.
  • the upstream-side immediate target temperature setting unit 405 determines that the heat pump information indicates the operation start of the compressor 22 (step S2: YES)
  • the upstream-side immediate target temperature setting unit 405 acquires the temperature T 2 detected by the heating portion upstream-side temperature detector 54 from the sensor information acquisition unit 401.
  • the upstream-side immediate target temperature setting unit 405 determines whether the temperature T 2 reaches the target temperature T 2d set by the upstream-side target temperature setting unit 403 (step S5).
  • the upstream-side immediate target temperature setting unit 405 calculates a temperature change rate dT 2 /dt on the upstream side of the heating portion 33 using the temperatures T 1 , T 2 , and T 3 and the heat medium flow amounts F 1 and F 2 acquired by the sensor information acquisition unit 401 (step S6).
  • the temperature T 1 is a temperature of the water flowing through the inflow portion 31.
  • the temperature T 2 is the temperature of the water on the upstream side of the heating portion 33.
  • the temperature T 3 is the temperature of the water on the downstream side of the heating portion 33.
  • the flow amount F 1 is the flow amount of the water flowing through the inflow portion 31.
  • the flow amount F 2 is the flow amount of the water flowing through the heating portion 33.
  • the upstream-side temperature change rate calculation unit 402 calculates the temperature change rate dT 2 /dt by substituting each piece of sensor information into Equation (1) shown below indicating a heat balance model.
  • M denotes an amount of the water held in the heating portion 33.
  • cp n (n is a natural number) denotes a specific heat of the water at a temperature T n . Since the specific heat is determined by a water temperature, the upstream-side temperature change rate calculation unit 402 calculates the specific heat cp n according to the temperature T n .
  • Q pump denotes an amount of heat input to the water in the circulation pump 32. Since the amount of heat from the circulation pump 32 to the water is determined based on the flow amount F 2 of the water passing through the circulation pump 32, and the number of rotations, power consumption and characteristics of the circulation pump 32, the upstream-side temperature change rate calculation unit 402 calculates the input heat amount Q pump according to these values.
  • the upstream-side temperature change rate calculation unit 402 may identify the water amount M, the specific heat cp n and the input heat amount Q pump based on data of a transient state during actual operation, such that estimation precision is improved.
  • a denominator of a right side of Equation (1) indicates a heat capacity of the water held in the heating portion 33.
  • a numerator of the right side of Equation (1) indicates a heat amount of a difference between a heat amount of water obtained by mixing the water flowing from the inflow portion 31 into the upstream side of the heating portion 33 with the water circulated by the circulation portion 35 and a heat amount of the water flowing in the heating portion 33.
  • the temperature change rate dT 2 /dt is calculated based on a difference between a temperature of the water obtained by mixing the water flowing from the inflow portion 31 into the upstream side of the heating portion 33 with the water circulated by the circulation portion 35 and the temperature of the water flowing in the heating portion 33.
  • the upstream-side immediate target temperature setting unit 405 sets a value obtained by adding the temperature change rate calculated by the upstream-side temperature change rate calculation unit 402 to the temperature T 2 acquired by the sensor information acquisition unit 401 as the immediate target temperature T 2a (step S7).
  • the three-way valve control unit 406 determines the opening degree so that the water temperature on the upstream side of the heating portion 33 is the target temperature T 2a , and controls the three-way valve 34 based on the opening degree (step S8).
  • the three-way valve control unit 406 can control the opening degree of the three-way valve 34 at an appropriate temperature change rate according to characteristics (each portion temperature, a flow amount and a water amount held in the heating portion 33) of the warm water system 30 until the water temperature T 2 on the upstream side of the heating portion 33 reaches the target temperature T 2d . Thereafter, the operation of steps S5 to S8 is repeatedly executed until the temperature T 2 reaches the target temperature T 2d in step S5.
  • the upstream-side immediate target temperature setting unit 405 determines that the temperature T 2 reaches the target temperature T 2d in step S5 (step S5: YES)
  • the upstream-side immediate target temperature setting unit 405 sets the target temperature T 2d as the immediate target temperature T 2a (step S9).
  • the three-way valve control unit 406 determines the opening degree so that the water temperature on the upstream side of the heating portion 33 is the immediate target temperature T 2a , i.e., the target temperature T 2d , and controls the three-way valve 34 based on the opening degree (step S10).
  • control device 40 ends the control of the three-way valve 34 in the transient state, and starts steady-state control to control the opening degree of the three-way valve 34 based on the target temperature T 2d .
  • the control of the three-way valve 34 in the steady state is the same as the process of repeatedly executing steps S9 and S10.
  • the three-way valve control unit 406 controls the opening degree of the three-way valve 34 so that the temperature of the water on the upstream side of the heating portion 33 increases by a predetermined temperature until the temperature of the water on the upstream side of the heating portion 33 reaches the target temperature T 2d after the heat pump 20 operates. Accordingly, when the warm water system 30 is in a transient state, the opening degree of the three-way valve 34 can be controlled such that an opening and closing operation of the three-way valve 34 can follow the temperature change of the warm water.
  • the predetermined temperature is calculated based on states of the water flowing in the heating portion 33, the water circulated by the circulation portion 35, and the water flowing from the inflow portion 31 into the upstream side of the heating portion 33. Accordingly, the control of the opening degree of the three-way valve 34 can be performed according to the characteristics of the warm water heating system, and the water temperature on the upstream side of the heating portion 33 can be increased to the target temperature T 2a at an appropriate temperature increase rate.
  • dT 2 /dt which is the temperature difference between the temperature of the water obtained by mixing the water from the inflow portion 31 into the upstream side of the heating portion 33 with the water circulated by the circulation portion 35 and the temperature of the water flowing in the heating portion 33, as in the present embodiment.
  • the present invention is not limited thereto and the three-way valve control unit 406 may control the opening degree of the three-way valve 34 so that the water temperature on the upstream side of the heating portion 33 increases by another predetermined temperature.
  • the opening degree to the outflow portion 36 is controlled to be large such that temperature increase of the water temperature on the upstream side of the heating portion 33 becomes slow and it takes time for the warm water system 30 to transition to the steady state.
  • the opening degree to the circulation portion 35 is controlled to be large such that the temperature increase of the water temperature on the upstream side of the heating portion 33 becomes fast and the opening and closing operation of the three-way valve 34 may not follow the temperature change of the warm water.
  • the amount of heat exchanged in the condenser 24 of the heat pump 20 may decrease and the efficiency of the warm water heating system may become low.
  • a warm water heating system sets the target temperature on the upstream side of the heating portion 33 of the warm water system 30 based on the characteristics of the heat source system 10 and the warm water system 30.
  • Fig. 4 is a schematic configuration diagram of the warm water heating system according to the second embodiment of the present invention.
  • the warm water heating system according to the second embodiment includes a heat source upstream-side temperature detector 56 and a heat source flow amount detector 57, in addition to the heat source system 10 of the warm water heating system according to the first embodiment, and operation of the control device 40 is different.
  • the heat source upstream-side temperature detector 56 detects a temperature T 4 of hot water on the upstream side of the heat source system 10.
  • the heat source flow amount detector 57 detects a flow amount F 3 of the hot water flowing through the heat source system 10.
  • Fig. 5 is a schematic block diagram showing a configuration of a control device 40 according to the second embodiment of the present invention.
  • the control device 40 according to the second embodiment includes a downstream-side target temperature setting unit 407, in addition to the configuration of the control device 40 according to the first embodiment, and operation of the upstream-side target temperature setting unit 403 is different.
  • the downstream-side target temperature setting unit 407 sets a target temperature of the water on the downstream side of the heating portion 33 when the warm water system 30 enters a steady state if the heat pump 20 and the warm water system 30 operate.
  • the upstream-side target temperature setting unit 403 sets a target temperature of the water on the upstream side of the heating portion 33 when the warm water system 30 enters the steady state, based on the target temperature on the downstream side, and the sensor information acquired by the sensor information acquisition unit 401.
  • control device 40 operation of the control device 40 at the time of operation start of the warm water heating system according to the present embodiment will be described.
  • control device 40 differs in operation of step S1 from the operation of the control device 40 in the first embodiment, and operation after step S1 is the same as that in the first embodiment.
  • step S1 in the second embodiment will be described herein.
  • the downstream-side target temperature setting unit 407 of the control device 40 receives input of a target temperature T 3d on a downstream side of the heating portion 33 from a manager before operation start of the warm water heating system. Then, the upstream-side target temperature setting unit 403 acquires a temperature T4 and a flow amount F 3 detected by the heat source upstream-side temperature detector 56 and the heat source flow amount detector 57 from the sensor information acquisition unit 401. Also, the upstream-side target temperature setting unit 403 calculates a maximum heating amount of the condenser 24 at the time of maximum output of the heat pump 20 based on the acquired temperature T 4 and flow amount F 3 .
  • the upstream-side target temperature setting unit 403 calculates a target temperature T 2d on the upstream side of the heating portion 33 based on the calculated maximum heating amount, the flow amount F 2 of the water flowing in the heating portion 33, and the target temperature T 3d on the downstream side. Specifically, the upstream-side target temperature setting unit 403 sets, as the target temperature T 2d , the water temperature on the upstream side of the heating portion 33 required for setting the water temperature on the downstream side of the heating portion 33 as a target temperature T 3d based on the maximum output of the heat pump 20.
  • step S2 a process after step S2 is executed as in the first embodiment, such that the temperature of the warm water system 30 can be controlled to utilize maximum capacity of the heat pump 20 according to a condition of the heat source system 10.
  • a warm water heating system controls an opening degree (an adjustment amount of heat pump control) of a vane 23 of a heat pump 20 based on the temperature on a downstream side of a heating portion 33 of a warm water system 30.
  • Fig. 6 is a schematic configuration diagram of the warm water heating system according to the third embodiment of the present invention.
  • the warm water heating system according to the third embodiment includes a condenser temperature detector 58, in addition to the warm water system 30 of the warm water heating system according to the first embodiment, and operation of the control device 40 is different. Further, the warm water heating system according to the third embodiment may not include the inflow portion temperature detector 52 and the inflow portion flow amount detector 51.
  • the condenser temperature detector 58 detects a temperature T 5 of the condenser 24 of the heat pump 20.
  • Fig. 7 is a schematic block diagram showing a configuration of the control device 40 according to the third embodiment of the present invention.
  • the control device 40 includes a sensor information acquisition unit 401, a downstream-side temperature change rate calculation unit 408 (heat pump adjustment temperature calculation unit), a downstream-side target temperature setting unit 407, a downstream-side immediate target temperature setting unit 409, and a vane control unit 410 (heat pump adjustment amount determination unit).
  • the sensor information acquisition unit 401 acquires sensor information (a flow amount or a temperature) detected by each detector provided in the warm water system 30 and the condenser 24.
  • the downstream-side temperature change rate calculation unit 408 calculates a change rate (a heat pump adjustment temperature) of the water temperature on the downstream side of the heating portion 33, i.e., an increase rate of the water temperature, based on the sensor information acquired by the sensor information acquisition unit 401.
  • the change rate of the water temperature is calculated by applying the sensor information to a heat balance model.
  • the downstream-side target temperature setting unit 407 sets a target temperature of the water on the downstream side of the heating portion 33 when the warm water system 30 enters a steady state if the heat pump 20 operates.
  • the downstream-side immediate target temperature setting unit 409 sets an immediate target temperature of the water on the downstream side of the heating portion 33 at a current time according to the information acquired from the sensor information acquisition unit 401, the downstream-side temperature change rate calculation unit 408 and the downstream-side target temperature setting unit 407. Specifically, the downstream-side immediate target temperature setting unit 409 sets the immediate target temperature based on the temperature change rate calculated by the downstream-side temperature change rate calculation unit 408 until a current water temperature on the downstream side of the heating portion 33 reaches the downstream-side target temperature. Also, the downstream-side immediate target temperature setting unit 409 sets the target temperature set by the downstream-side target temperature setting unit 407 as the immediate target temperature after the current water temperature on the downstream side of the heating portion 33 reaches the downstream-side target temperature.
  • the vane control unit 410 performs control of the opening degree of the vane 23 through PID control based on the immediate target temperature set by the downstream-side immediate target temperature setting unit 409 and the current water temperature on the downstream side of the current heating portion 33.
  • control device 40 operation of the control device 40 at the time of operation start of the warm water heating system according to the present embodiment will be described.
  • Fig. 8 is a flowchart showing operation of the control device 40 according to the third embodiment of the present invention.
  • the downstream-side target temperature setting unit 407 of the control device 40 receives input of a target temperature T 3d on the downstream side of the heating portion 33 from a manager before operation start of the warm water heating system (step S11).
  • the manager of the warm water heating system operates the warm water system 30 and then operates the compressor 22 after the setting of the target temperature.
  • the downstream-side immediate target temperature setting unit 409 acquires a temperature T 3 detected by the heating portion downstream-side temperature detector 55 from the sensor information acquisition unit 401.
  • the downstream-side immediate target temperature setting unit 409 determines whether the temperature T 3 reaches the target temperature T 3d set by the downstream-side target temperature setting unit 407 (step S12).
  • the downstream-side immediate target temperature setting unit 409 calculates a temperature change rate dT 3 /dt on the downstream side of the heating portion 33 using temperatures T 2 , T 3 , and T 5 and a heat medium flow amount F 2 acquired by the sensor information acquisition unit 401 (step S13).
  • the temperature T 2 is a temperature of the water on the upstream side of the heating portion 33.
  • the temperature T 3 is a temperature of the water on the downstream side of the heating portion 33.
  • the temperature T 5 is a temperature of the heat medium in the condenser 24.
  • the flow amount F 2 is a flow amount of the water flowing through the heating portion 33.
  • the downstream-side temperature change rate calculation unit 408 calculates the temperature change rate dT 3 /dt by substituting each piece of sensor information into Equation (2) shown below indicating a heat balance model.
  • a denominator of a right side of Equation (2) indicates a heat capacity of the water held in the heating portion 33.
  • a numerator of the right side of Equation (2) indicates a heat amount of a difference between a sum of a heat amount of water flowing in the heating portion 33 and a heat amount heated in the heating portion 33 and a heat amount of the water flowing from the heating portion 33 into the three-way valve 34.
  • the temperature change rate dT 3 /dt is calculated based on a difference between a temperature of the water when the water flowing in the heating portion 33 is heated by the heating portion 33 and the temperature of the water flowing from the heating portion 33 into the three-way valve 34.
  • the downstream-side immediate target temperature setting unit 409 sets, as an immediate target temperature T 3a , a value obtained by adding the temperature change rate calculated by the downstream-side temperature change rate calculation unit 408 to the temperature T 3 acquired by the sensor information acquisition unit 401 (step S14).
  • the vane control unit 410 determines the opening degree of the vane 23 so that the water temperature on a downstream side of the heating portion 33 becomes the immediate target temperature T 3a , and controls the vane 23 to the opening degree (step S15). Accordingly, the vane control unit 410 can control the opening degree of the vane 23 at an appropriate temperature change rate according to characteristics of the heating portion 33 until the water temperature T 3 on the downstream side of the heating portion 33 reaches the target temperature T 3d . Thereafter, the operation of steps S12 to S15 is repeatedly performed until the temperature T3 reaches the target temperature T 3d in step S12.
  • step S12 determines that the temperature T 3 reaches the target temperature T 3d in step S12 (step S12: YES)
  • the downstream-side immediate target temperature setting unit 409 sets the target temperature T 3d to the immediate target temperature T 3a (step S16).
  • the vane control unit 410 determines the opening degree so that the water temperature on the downstream side of the heating portion 33 is the immediate target temperature T 3a , i.e., the target temperature T 3d , and controls the vane 23 with the opening degree (step S17).
  • the control device 40 ends the control of the compressor 22 in the transient state, and starts steady-state control to control the opening degree of the vane 23 based on target temperature T 3d .
  • the control of the vane 23 in the steady state is the same as the process of repeatedly executing steps S16 and S17.
  • the vane control unit 410 controls the opening degree of the vane 23 so that the temperature of the water on the downstream side of the heating portion 33 increases by a predetermined temperature until the temperature of the water on the downstream side of the heating portion 33 reaches the target temperature T 3d after the heat pump 20 operates. Accordingly, when the warm water system 30 is in a transient state, the opening degree of the vane 23 can be controlled so that the opening degree control of the vane 23 can follow the temperature change of the warm water.
  • the predetermined temperature is calculated based on the state of the water flowing in the heating portion 33 and the state of the water flowing from the heating portion 33 into the three-way valve 34, and the heating amount in the heating portion 33.
  • control of the opening degree of the vane 23 can be performed according to the characteristics of the warm water heating system, and the water temperature on the downstream side of the heating portion 33 can increase to the target temperature T 3a at an appropriate temperature increase rate.
  • appropriate control of the opening degree can be performed using the temperature change rate dT 3 /dt, which is the temperature difference between the temperature of the water when the water flowing in the heating portion 33 is heated by the heating portion 33 and the temperature of the water flowing from the heating portion 33 into the three-way valve 34.
  • the present invention is not limited thereto and the opening degree of the vane 23 may be controlled so that the water temperature on the downstream side of the heating portion 33 increases by another predetermined temperature.
  • the predetermined temperature is set to be too low, the increase rate of the opening degree is controlled to be suppressed, a speed of a temperature increase of the water temperature on the downstream side of the heating portion 33 decreases, and it takes time for the warm water system 30 to transition to the steady state.
  • the increase rate of the opening degree is controlled to be high, the speed of the temperature increase of the water temperature on the downstream side of the heating portion 33 increases, and the opening degree control of the vane 23 may not follow the temperature change of the warm water.
  • the amount of heat exchanged in the condenser 24 of the heat pump 20 may become small, and efficiency of the warm water heating system may become low.
  • a warm water heating system controls the opening degree of the vane 23 of the heat pump 20 based on a state of the heating portion 33 of the warm water system 30 as in the third embodiment while controlling the opening degree of the three-way valve 34 based on the state of the warm water system 30 as in the second embodiment.
  • Fig. 9 is a schematic configuration diagram of the warm water heating system according to the fourth embodiment of the present invention.
  • the warm water heating system according to the fourth embodiment has both the configuration of the warm water heating system according to the second embodiment and the configuration of the warm water heating system according to the third embodiment.
  • the configuration of the control device 40 according to the fourth embodiment may also have both the configuration of the control device 40 according to the second embodiment and the configuration of the control device 40 according to the third embodiment.
  • Operation of the warm water heating system according to the fourth embodiment includes the operation of the second embodiment and the operation of the third embodiment.
  • step S11 of the third embodiment when the setting of the downstream-side target temperature in step S11 of the third embodiment is performed, calculation of the upstream-side target temperature in step S1 of the second embodiment is performed using the downstream-side target temperature.
  • control device 40 performs only opening degree control of the three-way valve 34.
  • control device 40 executes the process of steps S12 to S15 according to the third embodiment in parallel while executing the process of steps S5 to S8.
  • control device 40 performs the process of steps S16 and S17 according to the third embodiment when executing the process of steps S9 and S10 according to the second embodiment.
  • control device 40 can appropriately control the opening degree of the three-way valve 34 and the opening degree of the vane 23.
  • the control device 40 described above includes a computer system therein. Also, the above process is performed by storing the operation of each processing unit described above in a computer-readable recording medium in the form of a program and by a computer reading and executing this program.
  • the computer-readable recording medium refers to a magnetic disk, a magneto-optical disc, a CD-ROM, a DVD-ROM, a semiconductor memory, or the like.
  • this computer program may be distributed to a computer by a communication line, and the computer receiving this distribution may execute the program.
  • the program may be a program capable of realizing the above-described functions through a combination with a program previously recorded in a computer system, i.e., a differential file (a differential program).
  • the present invention provides a control device for controlling a warm water heating system including a heat pump including a heat output heat exchanger which takes heat from a heat source system and outputs heat, a heating portion which heats water using the heat obtained from the heat output heat exchanger, an outflow portion which flows the water heated by the heating portion to a heating target, a circulation portion which circulates the water heated by the heating portion to an upstream side of the heating portion, an inflow portion which flows water from the heating target into the upstream side of the heating portion, and an adjustment unit which adjusts flow amount distribution of the water from the heating portion to the outflow portion and the circulation portion, wherein the control device includes an upstream-side target temperature setting unit which sets a target temperature of the water on the upstream side of the heating portion, and an adjustment amount determination unit which determines an adjustment amount of the flow amount distribution by the adjustment unit so that the temperature of the water on the upstream side of the heating portion increases by a predetermined temperature until a temperature of the water on the upstream side of the heating portion reaches the target temperature.
  • the adjustment amount in the adjustment unit or the adjustment amount of the heat pump is determined so that the temperature of the warm water on the upstream side or the downstream side of the heating portion increases by a predetermined temperature until a temperature of the warm water on the upstream side of the heating portion reaches the target temperature. Accordingly, it is possible to appropriately control the temperature increase rate in the transient state of the warm water system.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Heat-Pump Type And Storage Water Heaters (AREA)
  • Steam Or Hot-Water Central Heating Systems (AREA)
EP12847838.5A 2011-11-11 2012-11-08 Warm water heating system, control device and control method Not-in-force EP2778555B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2011248030A JP5536013B2 (ja) 2011-11-11 2011-11-11 温水加熱システム並びに制御装置及び制御方法
PCT/JP2012/078995 WO2013069734A1 (ja) 2011-11-11 2012-11-08 温水加熱システム並びに制御装置及び制御方法

Publications (3)

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EP2778555A1 EP2778555A1 (en) 2014-09-17
EP2778555A4 EP2778555A4 (en) 2016-01-06
EP2778555B1 true EP2778555B1 (en) 2018-10-17

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EP (1) EP2778555B1 (ko)
JP (1) JP5536013B2 (ko)
KR (1) KR101560511B1 (ko)
CN (1) CN103703323B (ko)
WO (1) WO2013069734A1 (ko)

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CN103528188B (zh) * 2013-11-04 2016-09-21 Tcl空调器(中山)有限公司 空气源热水机系统及其控制方法
US10345023B2 (en) 2015-05-22 2019-07-09 Daikin Industries, Ltd. Temperature-adjusting fluid supply apparatus

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JPS63148046A (ja) * 1986-12-11 1988-06-20 Mitsubishi Electric Corp ヒ−トポンプ給湯装置
JP2591768B2 (ja) * 1987-12-29 1997-03-19 東陶機器株式会社 湯水混合装置
JP3755422B2 (ja) 2001-05-18 2006-03-15 松下電器産業株式会社 ヒートポンプ給湯機
JP3778102B2 (ja) * 2002-02-19 2006-05-24 松下電器産業株式会社 ヒートポンプ給湯装置
CN101012962A (zh) * 2007-02-07 2007-08-08 党路明 一种具有节水与抗冻结功能的生产淋浴用热水的方法与装置
US9823666B2 (en) * 2008-06-26 2017-11-21 Belparts Flow control system
JP5729910B2 (ja) * 2010-03-05 2015-06-03 三菱重工業株式会社 温水ヒートポンプおよびその制御方法
CN102162681B (zh) * 2011-04-15 2013-06-12 江苏天舒电器有限公司 一种比例调节型一次加热式热泵热水机

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KR101560511B1 (ko) 2015-10-14
JP5536013B2 (ja) 2014-07-02
JP2013104601A (ja) 2013-05-30
EP2778555A4 (en) 2016-01-06
WO2013069734A1 (ja) 2013-05-16
CN103703323B (zh) 2016-06-08
CN103703323A (zh) 2014-04-02
KR20140026635A (ko) 2014-03-05
EP2778555A1 (en) 2014-09-17

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