1. Getting air temperature control
The air supply temperature control is the specified air temperature control. The applicable conditions are usually the fresh air unit to meet the indoor sanitation requirements rather than the load of the indoor load.Therefore, throughout the control time, the air supply temperature is based on the principle of maintaining a constant value.Due to the different requirements for indoor in winter and summer, the temperature of winter and summer air supply should have different requirements.That is to say, when the fresh air unit sets the air supply temperature control, there are two control values ??in the whole year -winter control value and summer control value, so the problem of the transformation of the controllers winter and summer conditions must be considered.
When the air supply temperature control is controlled, the water volume controls the water in summer, the amount of water volume of the heat disk tube or the steam disk pipe in winter.In order to manage convenience, the temperature sensor is generally located on the air supply pipe in the machine room where the unit is located.
2. Interior temperature control
For some DC systems, fresh air can not only meet the environmental standards, but also bear all indoor loads.Because indoor load changes, at this time, the method of controlling the air supply temperature must not meet indoor requirements (may be overheated or too cold).Therefore, the temperature of the location must be controlled.It can be seen that at this time, the temperature sensor must be set in the typical area of ??the controlled room.Because the DC system is usually equipped with an exhaust system, the temperature sensor is located in the exhaust pipeline and considering a certain correction is also a feasible method.
In addition to the DC system, the fresh air unit is usually used with the fan coil.In some projects, due to various reasons (such as restrictions on dehumidification capacity of the fan coil, etc.), the fresh air unit assumes part of the indoor load during design. This approach does not exist according to the air supply temperature control for the air supply temperature control.questionable.However, when the outdoor climate changes make the indoor heat balance (such as some time of the transition season), if the air supply temperature continues to control the air supply temperature, it will inevitably cause the room to be too cold (when the cold water is provided) or the heat is overheated (when the heating water supply)At this time, indoor temperature control should be used.Therefore, in this case, in terms of operation throughout the year, a joint control method of air supply temperature and indoor temperature should be adopted.