The National Technical Measures for Civil Building Engineering Design is an energy-saving design of industrial enterprises' construction projects, which should be used in combination with its engineering practice. "National Technical Measures for Civil Building Engineering Design —— Special Chapter on Electrical Energy Saving" focuses on energy-saving measures in system configuration, equipment selection and electrical control of building electrical engineering. Among them, what are the technical measures of ventilation and air conditioning system in the National Technical Measures for Electrical Energy Saving in Civil Building Engineering Design? The following is an introduction to the technical measures of ventilation and air conditioning system in civil engineering in China brought by construction network for reference.

1. For a ventilation system that mainly eliminates indoor residual heat, it is appropriate to control the number or speed of ventilation equipment according to the room temperature.

2. The underground parking garage ventilation system control mode:

1) Start and stop the fans regularly (number of running units).

2) Automatically control the start-stop and running number of fans according to the CO concentration in the garage.

3. When artificial heat source and cold source are used for building preheating or precooling, the fresh air system should be able to shut down automatically. When using outdoor air for pre-cooling, try to use fresh air system.

4. In the room with relatively large personnel density and great changes, it is appropriate to set up a CO2 concentration detection device to adjust the fan speed according to the indoor CO2 concentration value, so as to keep its prosperity within the limits stipulated by the health standards.

5. When the pressure difference between the two ends of the system filter screen exceeds the set value, it will give an alarm to prompt cleaning or replacement, so as to reduce the energy consumption of the fan, and it should provide a forced stop function.

6. When the exhaust system adopts a rotary heat recovery device, the fan and the runner should be controlled in linkage.

7. In the central management workstation, the outdoor temperature and humidity parameters are displayed day and night. Pre-arranged work and holiday schedules and other conditions, automatically (or at work) modify the minimum fresh air ratio, air supply parameters and indoor temperature and humidity parameter settings.

8. Energy-saving control of fresh air units.

1) Automatically adjust the opening of the electric valve according to the difference between the supply air temperature and the set value.

2) According to the difference between the air supply humidity and the set value, automatically adjust the humidification valve (usually in winter).

3) The start and stop of the fan shall be interlocked with the fresh air damper and electric valve.

9. Energy-saving control of air conditioning units

1) Automatically adjust the opening of the electric valve according to the difference between the return air (or indoor) temperature and the set value.

2) According to the difference between the return air (or indoor) humidity and the set value, automatically adjust the humidification valve (usually in winter).

3) The start and stop of the fan, air door and electric valve shall be interlocked. In the system with return air, the fresh air valve and the return air valve should be interlocked.

4) According to the CO2 concentration in the return air, adjust the opening of fresh air, return air and exhaust valve, and ensure the minimum fresh air ratio under the condition of meeting the requirements of sanitary standards.

5) According to the comparison of indoor and outdoor enthalpy, the opening of fresh air, return air and exhaust valve is automatically adjusted, and the control mode of changing the specific enthalpy of fresh air is realized by combining the indoor and outdoor temperatures.

6) When the outdoor temperature is lower than the indoor temperature, we should make full use of the outdoor low temperature to adjust the indoor temperature. The enthalpy difference controller controls the opening of each air valve by comparing the outdoor temperature with the return air temperature. Air volume control can adopt automatic and manual modes, and through the dual adjustment of air valve and speed change, it can detect the temperature (humidity) and set the indoor temperature and humidity.

10. Energy-saving control of fan coil units

1) Manually control the three-speed switch of the fan and the start and stop of the fan.

2) Manually control the three-speed switch of the fan and the start and stop of the fan, and automatically control the indoor thermostat of the electric water valve.

3) Fan start-stop and electric water valve should be interlocked.

4) For fan coil units operating in winter and summer, the thermostat shall be set according to the seasonal changes:

① The thermostat is equipped with a manual changeover switch;

(2) For the two-pipe system, a ring-shaped temperature switch is set on the fan coil supply return pipe to realize the function of automatic season switching. If conditions permit, realize the unified and centralized seasonal transformation.

5) Centralized control of the three-speed switch and the electric water valve of the fan coil unit is realized by the intelligent lighting control device or the intelligent guest room controller, so as to meet the automatic adjustment of the room temperature and the setting of different temperature modes.

6) The room temperature controller should be located in a representative position indoors and should not be close to heat sources, lights and external walls. The thermostat should not be set in a closed space such as a bedside table, nor should it be placed in the center.

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