Pipeline coordination conflicts and solutions
Pipeline coordination conflicts are the most common issue, with an average of 30-50 collision points per 1,000 m2 of MEP pipeline space. The solution is first to implement BIM pipeline coordination detailed design, establishing BIM models of each discipline's pipelines before construction for collision detection and spatial optimization. Pipeline coordination principles: small pipes yield to large pipes, pressurized pipes yield to non-pressurized pipes, electrical conduits yield to water pipes, metal pipes yield to non-metal pipes. For areas with difficult clear height, wide-flat ducts can be used instead of square ducts.
Equipment selection mismatched with actual operating conditions
Typical manifestations of equipment selection mismatched with actual operating conditions include: oversized chillers leading to inefficient operation, excessive pump head margin leading to energy waste, and insufficient cooling tower capacity leading to poor heat exchange. The solution is to use annual dynamic load simulation to determine equipment capacity, using EnergyPlus or DesignBuilder for 8760-hour hourly simulation. For variable-frequency equipment, the frequency conversion range and optimized control strategy should be set according to actual operating conditions.
Quality problems caused by non-standard construction techniques
Common problems of non-standard construction techniques include excessive air duct leakage, water pipe welding quality defects, non-standard cable wiring, and inadequate insulation installation. Causes of excessive air duct leakage include flange connection bolts not tightened, non-standard gasket installation, and duct seam cracking. The solution is to strictly implement construction technique standards and acceptance specifications, implement the three-inspection system (self-inspection, mutual inspection, handover inspection), and conduct on-site supervision for critical processes.
Operational failures caused by inadequate system commissioning
Common problems of incomplete system commissioning include hydraulic imbalance in the air-conditioning water system causing uneven cooling and heating at terminals, air volume imbalance in the air system, and improper PID parameter settings in the control system. Hydraulic imbalance in the air-conditioning water system is the most common problem; the solution is to use the proportional method or compensation method for hydraulic balance commissioning, using ultrasonic flow meters to measure the flow of each branch. Air system commissioning should use anemometers and air flow hoods to measure the air volume of each outlet.