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Variable temperature and pressure control system of refrigerating media of central air-conditioner

A control system and central air-conditioning technology, applied in heating and ventilation control systems, heating and ventilation safety systems, refrigerators, etc., can solve problems such as optimization of the overall system, increase in complexity and cost, and achieve reduction Wiring workload, reduced risk of leakage, effects of avoiding waste

Inactive Publication Date: 2014-03-26
林铖
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, its scheme is limited to the terminal heat exchange equipment, and does not mention the optimization implementation scheme of the overall system
And its terminal heat exchange equipment control system uses two temperature sensors for water inlet and water outlet, which increases complexity and cost

Method used

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  • Variable temperature and pressure control system of refrigerating media of central air-conditioner
  • Variable temperature and pressure control system of refrigerating media of central air-conditioner
  • Variable temperature and pressure control system of refrigerating media of central air-conditioner

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0072] Example 1 is figure 2 The control system of the middle end heat exchange equipment 3 includes: a control point sensor 4 , a brine control valve 5 , a controller 6 , and a brine outlet temperature sensor 9 . Taking a room air conditioner as an example, the control point sensor is the room temperature sensor.

[0073] In the prior art, the brine control valve 5 can be an on-off valve or a regulating valve. In order to achieve the beneficial effect of the present invention, the brine control valve 5 in this embodiment must be a regulating valve.

[0074] In the prior art, the controller 6 adjusts the opening of the brine control valve 5 through the deviation between the room temperature and the set temperature through PID calculation, thereby adjusting the cooling capacity so that the room temperature is equal to the set temperature.

[0075] The following reasons may cause the flow rate of the refrigerant to exceed the rated flow rate: 1. The selection of the air condit...

Embodiment 2

[0095] Example 2 is figure 2 The middle end heat exchange equipment 3 is the control system of the fresh air processor in the winter heating system. In order to prevent the heat exchanger from freezing and cracking due to too low temperature, in the prior art, it is common practice to set the minimum opening of the brine control valve to ensure the minimum flow of the brine. However, because the pressure difference between the inlet and outlet of the brine is not fixed, the flow rate may be too large and energy wasted, or the flow rate may be too small and the heat exchanger may freeze.

[0096] In this embodiment, the opening control of the brine control valve should not only use the logic described in Embodiment 1 to make the brine outlet temperature lower than the limit value Ts, but also need to control the brine outlet temperature to be higher than the antifreeze Set the value to ensure that the heat exchanger does not freeze.

[0097] The antifreeze setting value can ...

Embodiment 3

[0098] Example 3 is Figure 5 The brine circuit control system of the heat pump unit 13 in the water loop heat pump system, the present invention does not involve the control of other components of the heat pump unit.

[0099] In the current technology, it is more ideal to use a constant pressure difference control valve to control the constant flow rate, and the electric on-off valve is interlocked with the heat pump unit, the cost is high, and the flow rate cannot be adjusted.

[0100] In this embodiment, the outlet temperature of the brine is controlled to ensure the flow rate, and the outlet temperature of the brine can be obtained by the following formula:

[0101] Ts = φ · ΔT + Ti

[0102] Ts Brine outlet control temperature

[0103] φCompressor load rate If it cannot be unloaded, it is 1.0

[0104] △T Theoretical temperature difference between the inlet and outlet of the brine

[0105]...

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PUM

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Abstract

A central air-conditioner is composed of a cold and heat source 1, a pump 2, a refrigerating medium conveying and distributing pipe network, one or more tail end heat exchange devices 3 and a communication network which is connected with all devices. Each tail end heat exchange device (3) is composed of a control point temperature sensor 4, a refrigerating medium outlet temperature sensor 9, a refrigerating medium control valve 5, a controller 6, a heat exchanger 7 and a fan 8. The tail end heat exchange devices limit the flow of the refrigerating media through the temperature of a refrigerating medium outlet. The pressure of the pump is adjusted through the opening degree of a refrigerating medium control valve of each tail end heat exchange device. The conveying temperature of the refrigerating media is adjusted through the temperature of the refrigerating medium outlet of each tail end heat exchange device.

Description

technical field [0001] The invention relates to a method for controlling the temperature and pressure of a refrigerant in a central air conditioner. Background technique [0002] The flow head of the pump in the central air conditioner and the heat transfer capacity of the heat exchanger are generally selected according to the maximum load, and a margin is left. But in actual operation, the load rate is often low, so if figure 1 As shown, at the terminal heat exchange equipment 3, a control system is generally installed, the brine control valve 5 can be a regulating valve or an on-off valve, and the controller 6 is based on the reading of the temperature sensor 4 at the control point (usually the indoor temperature or the outlet temperature). Wind temperature) and the set value, close (or close) open (or open) the brine control valve to adjust the flow of brine, and then adjust the heat transfer, so that the temperature of the control point reaches the set value value or f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F24F11/00
CPCF25B25/005F24F11/83F24F11/85F24F11/84
Inventor 林铖
Owner 林铖