Engineering

Overview

The Engineering division is responsible for providing safe and adequate public facilities. The department provides the following services: 
  • Manages the construction of public infrastructure and Capital Investment Projects,
  • Maintains drainage ways and structures,
  • Monitors traffic flows and coordinates traffic counts throughout town,
  • Maintains Avon's Heat Recovery System,
  • Monitors water rights as they relate to existing and future development; and
  • Provides technical support services to other departments.
 


 

2023 Projects

RECREATION CENTER AND HEAT RECOVERY CONTROLS UPGRADE AND CHILLER REPLACEMENT PROJECT

Pool Area small

Since Recreation Center construction in 1996, energy efficiency has risen to be among the top priorities for building owners and operators as a function of both rising energy costs and growing concern over environmental impact. It naturally follows those buildings should be maintained in a manner to align with these evolving demands and opportunities be considered at critical junctures such as this project to leverage opportunity where appropriate.

The existing heating, ventilation, and air conditioning (HVAC) system framework for the Recreation Center has fundamentally sound elements but two (2) notable deficiencies. The primary misalignment between today’s priorities and the existing systems serving the Recreation Center lie in (1) control systems having reached end of useful service life and no longer communicating with the building systems, and (2) the way in which heat is generated for the facility. Staff needs the ability to remotely monitor and manage building system operations, which we do not currently have. 

Additionally, the current HVAC system relies on gas-fired appliances for heating while industry trends resolve to transition building energy systems away from reliance on fossil fuels at the local level. Commonly referred to as “Electrification” or “Decarbonization”, these initiatives acknowledge and leverage the reality of an increasingly renewable electric grid over time. The Town’s investment in the wastewater Heat Recovery (HR) System over a decade ago could be deemed prescient considering these current industry trends, and investment in the Rec Center HVAC controls systems present a timely opportunity to begin the transition of the building away from fossil fuel reliance. This strategy does require updating the HVAC equipment assets, in conjunction with controls systems, to achieve that end. A multi-year approach to replace gas-fired equipment currently near the end of useful life can be developed and budgeted for accordingly.


Recreation Center and Heat Recovery Controls Upgrades 
Map Heat Recovery System
The existing 14-year-old Building Automation System (BAS) is only accessible locally, through a dated workstation that is no longer supported and resides in the pool manager’s office within the Recreation Center. The BAS is a computer networking system that monitors and controls the various electric and mechanical systems throughout a building.   It is essential to keep the BAS up to date in good working order to ensure the building’s mechanical systems are operating properly and efficiently.  The existing BAS serves a network of old and failing sensors and equipment and lacks the ability to communicate with the Town’s Heat Recovery System that was intended to reduce the energy footprint of the Rec Center, among other Town facilities. Notable deficiencies include limited to no remote access for building maintenance personnel, inability to operate equipment on a schedule, inability to control fan speed and maintain pressure setpoints in the natatorium, and the lack of integration with the town’s Heat Recovery System.

The Heat Recovery (HR) System control was originally established utilizing an industrial control platform more appropriately applied to settings such as water and wastewater treatment facilities. Due to complexity of the industrial control platform, specialty vendor involvement is required for maintenance and upkeep. Though the system is ultimately an HVAC system with complexity not exceeding that of conventional HVAC equipment, the HR System industrial control system cannot be maintained by conventional HVAC control vendors or facilities maintenance team.

The base scope of this project is to upgrade and replace the existing Recreation Center BAS. The BAS is beyond useful service life and no longer meets operational requirements. A Heat Recovery Controls Bid Alternate was included to eliminate the existing industrial control system and integrate with the Recreation Center BAS system and controls. Additional benefits include streamlining operations and improvements to comfort levels and energy efficiency.

Goals of this Recreation Center Controls Upgrades Project:

  • Gain Control and Remote Monitoring Capabilities for Rec Center HVAC and Heat Recovery Equipment via Cloud-Based System 
  • Improve Occupant Comfort Throughout Rec Center, Especially in Natatorium
  • Integrate Rec Center Controls with Heat Recovery System
  • Improve Monitoring and Troubleshooting of HVAC Systems for Facilities Team
  • Reduce Energy Footprint of Rec Center and Establish Path to Electrification


Heat Recovery Chiller Replacement

In 2008, the Town of Avon implemented an energy project by establishing a heat recovery chiller at the Avon Wastewater Treatment Plant. The chiller recovers waste heat from the treatment plant effluent immediately before discharge to the Eagle River. Energy recovered from that effluent is elevated to usable temperatures by the heat recovery chiller before being distributed via a direct-buried piping network to the Heat Distribution Building (HDB) adjacent to the Rec Center. The HDB contains piping and heat exchangers for each of the four (4) water bodies, along with a piping connection to Avon Town Hall.

As originally conceived, the Heat Recovery Project established heat systems for the Rec Center pools and provisions for extensive future snowmelt systems, but town priorities have since shifted away from implementation of snowmelt leaving capacity for future conversion of Recreation Center gas-fired HVAC equipment. The Heat Recovery Chiller is integral to the adopted Climate Action Plan and reducing Avon’s Carbon Footprint. 

250-Ton Heat Recovery Chiller

Council awarded the project to Trane U.S. Inc. and the construction budget is:

  • Recreation Center Controls Upgrades                                  $168,467
  • Heat Recovery Controls Upgrades                                       $88,955
  • Heat Recovery Chiller Replacement                                    $203,525

TOTAL:                                                                                       $460,947

 

Construction Schedule:   The Recreation Center Controls Upgrades work is scheduled to begin May 1, 2023 and be completed by June 30. 2023. Current lead time for the Heat Recovery Chiller is approximately (28) weeks. Completion date for Heat Recovery Chiller Replacement will be revised accordingly upon executing contract and placing equipment order. An approximate two to four-week construction period is anticipated to install the chiller. 

FINANCIAL CONSIDERATIONS:  The construction contract for the Project will be funded from the Recreation Center Controls Upgrades Project and Heat Recovery Controls Replacement Project budgets as approved in the Town of Avon 2023 Capital Projects Fund. Heat Recovery Chiller Replacement is funded thru the Equipment Replacement Fund.  The Project budget is shown in Table 1 below and includes 10% contingency.

 Engineering Services                                              

  • Existing HVAC & Controls Assessment     $7,500
  • Design & Administration                            $62,000

Construction Cost                                                    

  • Recreation Center Controls Upgrades     $168,467
  • Heat Recovery Controls Replacement     $88,955
  • Heat Recovery Chiller Replacement        $203,525

Contingency (10 %)                                         $46,095

TOTAL:                                                           $576,542