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Controller for water heater system, program for controlling water heater system, and method for operating water heater system

A supply system and control device technology, applied to heating systems, heating methods, and centralized heating, can solve problems such as long boiling time, achieve the effect of improving COP and preventing water cut-off

Active Publication Date: 2013-01-23
MITSUBISHI ELECTRIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since the heat supply decreases, the boiling time becomes longer, and there is a problem that the risk of water cutoff is high.

Method used

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  • Controller for water heater system, program for controlling water heater system, and method for operating water heater system
  • Controller for water heater system, program for controlling water heater system, and method for operating water heater system
  • Controller for water heater system, program for controlling water heater system, and method for operating water heater system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0042] use figure 1 Heat pump hot water supply system 1000 according to Embodiment 1 will be described. figure 1 The heat pump hot water supply system 1000 relative to Figure 17 The shown conventional heat pump hot water supply system includes a heat source machine controller 31 and a system controller 32 (hot water supply system control device). In addition, as a constituent element, with respect to Figure 17 The conventional heat pump hot water supply system shown also has one or more tank water temperature sensors 35 (tank water temperature detection sensors), outside air temperature sensors 30, supply hot water temperature sensors 33 (second refrigerant temperature detection sensors) One example), return hot water temperature sensor 34 (an example of second refrigerant temperature detection sensor), room temperature sensor 36 , sensor group such as flow sensor 37 , and auxiliary heat source 22 . When the rotation speed of the circulation pump is fixed, the flow sensor...

Embodiment approach 2

[0130] Figure 8 It is a block diagram of the system controller 32 in Embodiment 2. The system controller 32 according to Embodiment 2 is characterized by further including a high-COP operating frequency calculation unit 12 . In the system controller 32 according to Embodiment 2, the operation switching unit 3 and the high-COP operating frequency calculation unit 12 constitute an operation control unit.

[0131] (High COP operating frequency calculation unit 12)

[0132] The high-COP operating frequency calculation unit 12 stores, for each frequency of the compressor 201, Figure 4 to Figure 6 The characteristic data group shown. For example, when the high-COP operating frequency calculation unit 12 is provided with the return hot water temperature as an input, the Figure 4~6 The approximate expression of the characteristic data shown (an example of correspondence information) calculates the operating frequency at which the COP is the highest.

[0133] Alternatively, the...

Embodiment approach 3

[0137] Figure 9 This is the operating method of the heat pump hot water supply system in the third embodiment. The system controller 32 further includes the boiling time estimation part 13 compared with the structure of Embodiment 2. The boiling time estimation part 13 estimates the boiling time to tank target water temperature. In the system controller 32 according to Embodiment 3, the operation switching unit 3 and the boiling time estimation unit 13 constitute an operation control unit.

[0138] Figure 10 It is a figure for demonstrating the primary delay characteristic in Embodiment 3. Regarding the water temperature change of the tank, such as Figure 10 As shown, roughly shows the characteristics of wasted time and one delay.

[0139] The time constant can be obtained by calculating the boiling time when it is assumed that a constant heat supply operation (an example of the boiling time estimation operation) is performed to keep the temperature difference and flow...

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Abstract

Disclosed is a method for operating an indirect-heating, heat pump type water heater system which can prevent an increase in the risk of running out of hot water while providing an improved average COP (Coefficient of Performance) during a boiling period. The method is applied to the indirect-heating, heat pump type water heater system (1000), allowing either one or both of the temperature of water in a tank and the temperature of a second refrigerant flowing through a water circuit (21) to be used to estimate a change in the heat transfer efficiency of a second heat exchanger (29). When the heat transfer efficiency is determined to be high, an operation switching section (3) allows a heat source machine (20) to increase output, whereas when the heat transfer efficiency is determined to be low, the heat source machine (20) is allowed to decrease output.

Description

technical field [0001] The present invention relates to a method of operating a heat pump hot water supply system, which uses a heat exchanger to exchange heat obtained from outside air through a refrigeration cycle of a heat pump to heat water, and transfers the heated hot water to the heat pump. Water supply equipment supply. Background technique [0002] Figure 17 Shows the heat pump hot water supply system of the conventional indirect heating method. In the past heat pump hot water supply system, there are such Figure 17 (Indirect Heating Method) As shown, the heat source machine 20 of the heat pump refrigeration cycle that circulates the refrigerant is connected to the water circuit 21 via the water heat exchanger 202 (functioning as a condenser). Figure 17 An example in which the water heat exchanger 202 is accommodated inside the casing of the heat source machine 20 is shown, but it may be connected to the heat source machine 20 outside the casing of the heat sourc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F24H1/00F24H1/18
CPCY02B30/126F24D11/0214F24D2220/044F24D2220/042F24D19/1039F24D19/1012Y02B30/70F24H15/375F24H15/421F24H15/156F24H15/385F24H15/223F24H15/254F24H15/38Y02B30/12
Inventor 米谷博藤塚正史川岸元彦高桥佳宏
Owner MITSUBISHI ELECTRIC CORP
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