ENGINEERING THE FUTURE

Government Sector

Government Sector

Astoria City Hall

Astoria City Hall

The Astoria City Hall Building is a 15,000 square foot combination office building located in downtown Astoria. The building is heated but is not air-conditioned. The building is heated by a 450 MBH oil-fired steam boiler located in the basement of the facility. A thermostatically controlled centrifugal exhaust fan is located on the roof. The purpose of this fan is to pull warm air out of the building. MSE evaluated the following energy efficient measures for the facility:

  • Install high efficiency gas-fired boiler

  • Install high efficiency steam boiler and replace electric zonal heat with steam radiators

  • Install hot water condensing boiler and replace existing steam radiators with hot water radiators

  • Install R-19 roof insulation

  • Install double pane windows

  • Replace existing steam boiler, steam radiators and electric zonal heat with multi-zone air-to-air heat pumps

  • Install 4 kW photovoltaic solar collectors on roof of building


Astoria Police/Fire Department

Astoria Fire Dept

The Astoria Police/Fire Station is a single level, 15,860 square foot facility located at 555 30th Street in Astoria. The facility was constructed in the early 1990’s. About 50% of the building houses the fire department. The remaining 50% houses the police department. The central heating plant for the facility is a 500 MBH Weil-McLain cast iron sectional boiler with a rated efficiency of 80%. Two Pace multi-zone air handling units supply air to the facility and four ceiling mounted hot water unit heaters heat the fire truck high bay area. MSE evaluated the following energy efficient measures for the facility:

  • Install VSD’s on the AHU-1 & 2 supply and return fan motors

  • Convert multizone air distribution to VAV reheat air distribution system

  • Install CO2 demand ventilation control

  • Interlock high bay overhead doors with existing unit heaters

  • Replace existing (1) 500 MBH cast iron boiler with (1) high efficiency (Eff. = 92%) 500 MBH condensing boiler

  • Install VSD’s on (2) tertiary hot water pumps

  • Replace high bay unit heaters with gas-fired infrared heat system

  • Install destratification fans in the fire truck high bay area

 

Columbia County Courthouse/Annex

Columbia County Courthouse

This facility is 52,800 sf and is located at 230 Strand Street in St. Helens, OR. The courthouse and Annex are adjoined and connected by common corridors. Common gas and electric meters serve the facility. The Courthouse building has numerous courtrooms and several offices that make up the first and second level of the building. The HVAC system that serves the Annex is a constant volume reheat air distribution served by (7) air handling units. MSE evaluated the following energy efficient measures for the facility:

  • Install Direct Digital Controls to control all HVAC systems and lighting in the Courthouse/Annex.

  • Install high efficiency 1500 MBH condensing boiler (Eff.-92%) to replace existing 1375 MBH cast iron boiler (Eff.=75%).

  • Convert constant volume reheat air distribution system to variable air and volume (VAV) system with hot water reheat and VSD’s in AHU-1 thru AHU-7.

  • Install 15kW photovoltaic solar panels on the roof of the Annex.


Oregon State Department of Lands Building

Oregon State Department of Lands

The Oregon State Department of Lands Building is a 3-story, 72,000 square foot office building located at 775 Summer in Salem. The air distribution system for the entire building is variable air volume. The central heating plant consists of (1) Weil McLain cast iron sectional boiler with a thermal efficiency of about 75% (estimated). Several VAV terminal units are distributed throughout the building. MSE evaluated the following energy efficient measures for the facility:

  • Replace existing cast iron boiler with high efficiency (Eff. = 92%)

  • Condensing boiler

  • Install CO2 demand ventilation control

  • Replace VAV control AHU-1 Supply and Return fan motors

  • Install direct digital control (DDC control system to control HVAC systems)

  • Replace existing 166-ton reciprocating chiller with high efficiency Centrifugal chiller

  • Install VSD on existing cooling tower fan motor

  • Install variable speed drives (VSD’s) on existing 5-hp chilled water pumps Install VSD’s on (2) 5-hp hot water pumps

 

Yamhill County Courthouse Building

Yamhill County Courthouse

The Yamhill County Courthouse Building, located at 535 NE 5th, McMinnville, is the district courthouse for Yamhill County. The County Jail is also connected to the facility. The building has 2 levels above ground and a basement. The area of the building is about 53,000 sf. The facility has a central plant located in the basement. A 150-ton, water-cooled rotary screw chiller serves the chilled water loop for the building. The central heating plant consists of a 1,500 MBH Weil-McLain cast iron sectional steam boiler. This boiler was installed when the building was constructed in the late 1950’s. The boiler has an estimated average efficiency of 75%. MSE evaluated the following energy efficient measures for the facility:

  • Replace 1,500 MBH cast iron steam boiler (Eff. = 75%) with (2) 500 MBH hot water condensing boilers (Eff. = 92%) (EEM-1).

  • Install DDC control system to replace existing pneumatic control system.

  • Install VSD on hot water pumps for condensing boilers described in EEM-1.

  • Convert constant volume reheat system to VAV reheat system.

  • Install CO2 demand ventilation control for courtrooms.