Reduced costs and improved IAQ with dual path system

This paper covers the cost and benefit issues of a full dual path system to all control zones, including a case study office building in Lincoln, Nebraska. The system has one path that delivers outside air to all control zones. A two-stage heat recovery system is use for the outside air path to achieve as near space neutral temperature supply air to the space at all outside air conditions. The second path is a VAV system with options for continuous running of the system to control space temperature and humidity conditions throughout the summer months. The cost of supplying two smaller duct systems, versus one larger distribution system essentially had lower installation costs. The benefit of dual path is that the certainty the required outdoor air to all spaces at all times is achieved. The system improves IAQ, Productivity and reduces first and operating costs.