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Fields Of Application Of Thermostat Radiator Valves

Fields of application of Thermostat radiator valves

 

Thermostat radiator valves are used to control the flow of hot water or steam to a radiator.

 

They are commonly used in heating systems to regulate the temperature of a room by modulating the flow of hot water or steam to the radiator.

 

The most common type of Thermostat radiator valve is the manual valve, which is turned by hand to open or close the flow of water or steam.

 

Automatic thermostat Thermostat radiator valves are also available, which can be controlled by a thermostat or other controller.

 

Thermostat Thermostat radiator valves are used in a wide variety of applications.

 

Some of the most common applications include:

 

- HVAC

 

- Refrigeration

 

- Air Conditioning

 

- Heat Pumps

 

Construction and application principle of Thermostat Thermostat radiator valves

 

 (1) In the single-pipe indoor system, only one thermostatic valve is installed in the end room. Using the simulation analysis software of the heating network operating conditions, a five-story upper-split single-pipe downstream system (also applicable to an indoor single-pipe downstream system) is calculated, and the results are shown in Table 1. Table 1 shows the situation of constant water supply temperature, which is more in line with the actual working condition of uneven flow distribution in a large heating system, so it is representative. Under the design external temperature, if the actual flow rate is less than the design flow rate (relative flow rate is less than 1), the upper layer is hot and the lower layer is cold; if the actual flow rate is greater than the design flow rate (relative flow rate is greater than 1.0), the upper layer is cold and the lower layer is hot. situation.

 

 The above-mentioned variation law between room temperature and flow rate is universal. When the outside temperature is not equal to the design outside temperature. This variation law still exists, the only difference is that at the design external temperature, that is, when the temperature is the coldest, the vertical misalignment of the system is the most serious, that is, the room temperature deviation between the top and bottom floors is the largest; as the temperature warms, the vertical misalignment is also gradually slowed down. The reason for this vertical imbalance in the single-pipe system is mainly caused by the inconsistency between the flow change and the temperature change on the surface of the radiator.

 

        Generally speaking, the heat dissipation capacity of a heat sink mainly depends on the average temperature of the surface of the heat sink. In the design state, the selection of the heat transfer area of ??the radiator is calculated according to the average temperature of the design surface of each layer of the radiator under the design conditions. However, in actual operation, due to uneven flow distribution, the change ratio of the average surface temperature of each layer of radiator will be different from the design condition. When the actual flow rate of the riser is less than the design flow rate (that is, the relative flow rate is less than 1.0), the temperature difference between the supply and return water of the riser is greater than the design temperature difference. At this time, the average surface temperature of the upper radiator is higher than that of the lower radiator. It is more conducive to heat dissipation, so the phenomenon of upper heating and lower cooling occurs; when the relative flow rate is greater than 1.0, the situation is the opposite.

 

       The characteristic of the vertical imbalance of the single-pipe system is that the larger the flow rate, the higher the room temperature of the end room; the smaller the flow rate, the lower the room temperature of the end room. According to this thermal characteristic, for a single-pipe system, one temperature control valve per household should follow the following principles install:

 

①For a single-pipe downstream indoor system, a thermostatic valve should be installed on the radiator in the final room of the indoor system;

 

② For a single-pipe indoor system with a spanning pipe, a temperature control valve should be installed on the inlet water supply pipe or return pipe of the indoor system, and the remote temperature sensor of the temperature control valve should be placed in the end room of the indoor system;

 

③ For the upper-split single-pipe downstream system of the old building, one temperature control valve of each riser should be installed on the radiator of the lowest room. At this time, the heat supply should be measured by a heat distributor. It should be pointed out that the advantages of using this temperature control valve are that it not only improves the regulation performance of the heating system, but also reduces the initial investment of the project; its disadvantage is that the room temperature of each room in each household is the same standard, which cannot be adjusted arbitrarily. .

 

(2) A temperature control valve of the double-pipe indoor system is installed at the indoor entrance. The vertical imbalance of the double-pipe system is caused by the change of the system flow caused by the change of the pressure head of the natural circulation. In this system, the ideal solution is to install a thermostatic valve on each radiator. Some real estate developers are reluctant to increase investment and cancel all thermostatic valves. Although serious imbalance will not occur in the indoor system, it will inevitably lead to vertical imbalance between floors in the building. In engineering practice, this has also been proved.

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