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The air-conditioning hot and cold source machine room is located on the roof. The cold source uses two 90-ton/hour gas-fired hydrazine absorption direct-fired units, and one 300-ton-ton/hour electric centrifugal chiller (mainly used for low-load operation of the system, 134a is selected as refrigerant), chilled water. The supply and return water temperature is 7-12 °C. The heat source is also provided by the direct combustion unit. The output power of each unit is 210Kw, and the return water temperature of the hot water is 60-50°C.
Since the building air conditioner is mainly based on the VAV variable air volume air conditioning system, the air conditioning water system adopts four controls, which can meet the cold and heat load requirements of the building at the same time to obtain a more comfortable environment. The office area of ​​the building is the same water system, and all the hot and cold water return pipes are provided with balance valves to adjust the balance of the water systems of each branch. Since the owner emphasizes the pursuit of the system's energy-saving effect, the air-conditioning water system is designed as a secondary pump system, and the secondary pump uses a variable-frequency speed-regulating pump.
Podium public space (lobby, bank, indoor garden) podium public space uses a centralized air volume system, air conditioning unit with cooling coils, heating coils and high-pressure spray humidifier to meet the winter and summer air conditioning. Since the public space floor is high and the winter warm air is difficult to reach the ground, an aluminum finned hot water heater is arranged on the lower side of the surrounding floor to meet the comfort of the winter air conditioner. The fresh air of the public space of the podium is provided by the fresh air supply fan located on the basement floor. The fresh air is not treated at all (only the winter preheating coil is provided). The fan uses variable frequency control variable air volume fan to make the public space different in winter and summer. The required positive pressure setting can be kept constant during air conditioning operation.
The main air of the VAV variable air volume air conditioning system in the main building of the main building (conference room, office, dining room) is provided by two inverter-controlled variable air volume air conditioners on each floor, and its air volume changes with the change of the air conditioning cooling load. The air supply end of the system adopts a variable air volume control box, which is divided into an inner zone and an outer zone. The outer zone box adopts a fan-type variable air box with a hot water heating coil, and the inner zone adopts a direct current without a heating coil and a fan. Type change bellows. The fresh air is provided by a water-cooled screw unit with variable frequency air-conditioning air conditioner installed on the roof. Only the winter preheating coil is set in the fresh air. The fresh air is sent to the air-conditioning room through the constant air volume controller set on each floor, and then mixed with the return air. Air conditioner. The vAV variable air volume primary air conditioner is equipped with a heating coil (not provided for a standard office floor air conditioner), a cooling coil and a high pressure spray humidifier. As the summer operation, after the new return air is mixed, the air conditioner is cooled and then supplied to the end variable air volume control box for air conditioning, and the air treatment process is as shown in FIG. 2 . As a winter operation, the fresh air is preheated by the fresh air conditioner, and then re-heated and mixed into the air conditioner. The air conditioner is heated or cooled according to the control requirements (for different floors, heating or cooling may exist at the same time). The air after the tube is then humidified by spraying to the primary air outlet state point S required for the air conditioner. Of course, the set fresh air preheating air temperature needs to be greater than the smart °C, and the standard air temperature of the standard office floor air conditioner is not lower than the S point. The VAv variable air volume system is different from the conventional fresh air humidification VAV system. For the winter air conditioning operation, due to the full use of the cooling effect of the outdoor fresh air in winter, the conventional VAV system greatly reduces the large amount of cold and heat offset caused by the fresh air humidification, and is a relatively energy-saving air conditioning treatment.
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