by “Under the background of China’s industrialization, the modular design of refrigeration room will be an important topic in the research of HVAC design.
From the perspective of design, this paper first introduces the modular design of refrigeration room, and then expounds the main problems needing attention in the modular design of refrigeration room combined with a cast Hotel project, and looks forward to it step by step “Modular design system of refrigeration room” provides a reference for the development of modular design of refrigeration room 1、 Introduction to modularization of refrigeration room modularization of refrigeration room applies assembly and integrated design thinking, through standardized design, industrial production and modular installation, and uses BIM Technology and information cooperation platform in the whole process to improve the accuracy of modularization of refrigeration room, master the progress of each manufacturing stage in real time, and realize design, production, construction The whole process coordination of various manufacturing stages such as operation and maintenance.
The brief process of modular manufacturing of refrigeration room is as follows: plan the scheme design of the room → BIM modeling and optimization design → export the manufacturing details and material list → factory manufacturing and overall test → packaging and transportation → on-site assembly and commissioning → inspection and acceptance → operation and maintenance.
As a pioneer, design runs through the whole process of modularization of refrigeration room, which is the key factor of its realization.
The refrigeration machine room is generally composed of chiller, chilled water pump, cooling water pump, water collector, water processor, pipeline, valve and corresponding equipment foundation.
Modularization of refrigeration room through detailed research and analysis of the whole refrigeration room, the internal equipment, pipelines, valves and other elements are properly classified and combined to form a “integrated block” with relatively single function.
Considering the convenience and economy of transportation and the convenience of field module connection, according to the scale of refrigeration room, Make it into an integrated refrigerator room module or split it into chiller module, cooling water pump module, chilled water pump module, etc.
the module box should not exceed the limited size of Domestic Highway ordinary transportation, that is, length < 13m, width < 2.55m, height < 4m.
If it is necessary to increase, the maximum size shall be controlled according to class I large objects, that is, control length < 20m, width < 4.5m Height ＜ 3.8m, weight ＜ 100t.
According to the information of each module designed, the factory carries out accurate and rapid standardized prefabrication, processing and assembly, and carries out overall test in the factory.
After passing the test, each module is transported to the construction site.
During on-site installation, these modules can be arranged and combined, and assembled into a fully functional refrigerator room quickly, efficiently and safely like building blocks.
Case introduction this research project of precast hotel is located in Shenzhen, Guangdong Province.
It is a four-star hotel with a building area of 30000 square meters, a basement of 1 floor, 17 floors above the ground and a building height of 66m.
It is a class of high-rise hotel building.
The distribution of building functions is as follows: the first floor of the basement is 5.4m high, which is mainly used for parking garage, equipment room and hotel logistics functional area; The ground floor is 5.4m high, which is mainly used for hotel lobby, kitchen, full-time restaurant, joint office, etc; The second floor is 5.4m high, which is mainly used for multi-function room, staff logistics area, gym, etc; The third to seventeenth floors are the primary and secondary structure system.
The main structure is 10.8m high and the secondary structure is 3.2m high.
It is mainly used for guest rooms and supporting service rooms.
Figure 1 BIM model diagram of precast hotel the total cooling load calculated according to the hourly cooling load in summer is 3502kw.
After comprehensive comparison and in combination with the special needs of the owner, three centrifugal chillers with customized cooling capacity of 1756kw (500rt) are used as the cooling source of air conditioning, one of which is used as standby.
In addition, according to article 5.2.21 of code for energy efficiency design of public buildings sjg44-2018, Since the project has a stable demand for hot water and the building area is more than 10000 square meters, one of the chillers has partial heat recovery function.
Due to the limited land area of the project, the refrigerating machine room is set on the first floor underground.
The layout of the refrigerating machine room is shown in Figure 2: Figure 2 BIM model of the refrigerating machine room on the first floor underground 3 the main problems in the modular design of the refrigerating machine room ① the equipment layout in the machine room is standardized.
When planning the machine room scheme, in addition to considering the rationality of the cold source scheme and the net height of the machine room, It should also be noted that the equipment layout in the machine room must meet the provisions of article 8.10.2 of gb50736-2012, especially the distance requirements for the layout and maintenance of chillers; ② Modular coordination design of refrigeration room the core of modular design of refrigeration room is to establish a set of adaptive modular coordination principles to make the refrigeration room realize size modularization, structure typification, parameter serialization, component generalization and assembly building blocks, so as to promote the transformation of refrigeration room to intensive industrialization.
The number of modules shall be as small as possible during module segmentation, and the specifications of similar components in each module shall be as uniform as possible, which can reduce the difficulty of manufacturing and installation, save materials and ensure the economy of module production.
The project comprehensively considers the layout in the machine room, the installation conditions and transportation requirements of the project, and the module division in the refrigeration machine room is shown in Table 1; Table 1 configuration of module box in refrigerating machine room table ③ design of equipment and pipelines in the module.
When designing main equipment such as chiller and water pump, factors such as operating load, road conditions and handling mode shall be comprehensively considered, and corresponding fixing methods shall be adopted to connect with the steel frame base, and the pipeline can be fixed on the steel platform with ground support.
The low-pressure drop equipment is preferred for the chiller, and the inlet and outlet pipes are arranged on the same side, which is conducive to the size of the control module and the overall pipeline layout of the refrigeration room; The main water supply and return pipes of chilled water and cooling water shall minimize reducing diameters and elbows (especially 90 ° elbows) to facilitate the standardized manufacturing of the factory, reduce the pressure loss of the water system and improve the energy efficiency of the refrigerator room..
