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Design General Information
The design for the 3M Hefei a cold source project power plant design, through the interior design will provide a comfortable working environment. The design combines the characteristics of plant air conditioning, according to Hefei region's energy structure and energy situation and the current level of economic development, to meet the human thermal comfort, improve work efficiency of the premise, give full consideration to the entire central air conditioning system energy conservation.
The building design, two floors, total construction area of 48367 m², roof height of 7m. Designed primarily for air-conditioning design workshops and offices for staff, office staff, etc. to provide a comfortable and healthy environment. The design of the various parts of the building according to the structural characteristics and its use, taking full account of the indoor environment of comfort, ease of operation and management and energy on other aspects of the basis.
Major air conditioning system solutions for the air fan coil system, using the fan coil air-conditioned rooms bear the cold load and thermal load, each office room housed within a ceiling fan coil. Fresh air fresh air through a separate pipe leading into the fan coil, and then mixed together with air into the room. New air unit ceiling installation, new air unit affordable air-conditioned rooms of the floor all new wind load. The air conditioning system has the advantage of building area occupied by small, centrally cooling and heating; simultaneously from each end of the device has a separate switch and adjustment function, the room temperature can be adjusted independently and control of air and prevent cross-infection. Air conditioning system using closed system, because it is not easy in addition to pollution, save the initial investment, but also has obvious energy saving effect. Each floor layout design of two new air handling units, so each one.
In this paper, a new office building wind load, thermal load and wet load made a detailed accurate calculation for air conditioning units, vents, etc. The selection and duct design layout with full and accurate basis.
Office air evenly throughout strive for centralized control and energy saving. Duct layout and cross-section dimensions of the pipe have taken into account the requirements of the flow velocity and noise. Selection in the system focuses on the reasons for the selection of fan coil system and the characteristics of the system, fan coil semi-centralized system for offices and other multi-room and each room load and requirements vary buildings has broad applicability. The design chosen Carrier fan coil units produced, fan type, double inlet forward small multi-leaf centrifugal fan, water supply and return water temperature of 7 ℃ ~ 12 ℃.
Besides, the paper also focuses on the system partition layout, piping arrangements and with the programming system to choose the right equipment for specific problems, in particular, details of the air-conditioned selection method. The design of air conditioning water system selection closed, upright same way, the level of different programs, dual control, single-stage pump, constant flow system, this air conditioning system has a simple structure, the initial investment is small, easy to produce pipeline dirt and corrosion, required to overcome the hydrostatic head of the system, the pump power is small advantages. Since the design of multi-storey buildings, so you can use different levels of process water system vertically with the program, this system apart from supply and return piping risers, there are a tube with the way, because the parallel loop piping total substantially the same length, each user of the water resistance of the coil is substantially equal, so the hydraulic system stability, flow distribution uniform, favorable water balance.
Hot and cold air source heat pump as part of the use of hot and cold sources, the use of air cooled heat pump has the advantage of eliminating the boiler room units, cooling towers, cooling water pump and chiller plant, saving additional investment in construction and equipment investment. In addition, air-cooled heat pump unit primary energy efficiency up to 90%, saving energy consumption, greatly reducing the user cost.