Enwave Energy Corporation

Pearl Street Energy Centre

The Pearl Street Energy Centre project has been honoured with an Award of Distinction at the Ontario Engineering Project Awards by the Association of Consulting Engineering Companies (ACEC).

Buildings in Toronto generate more than half of the city's greenhouse gas emissions. New technologies, like Enwave's expanded heat delivery system, will play a critical role in reducing our cumulative carbon footprint.

This project exemplifies cutting-edge engineering and design, integrating robust energy solutions that challenge traditional methods.  Our focus on sustainable and efficient energy use through advanced engineering practices not only supports but advances the environmental goals of urban energy systems. HH Angus is the Prime Consultant and Mechanical and Electrical Design Engineers for the PSEC project. We are also acting as the design team project managers.

When fully utilized, Enwave's low carbon heating facility will provide enough low-carbon heating to reduce emissions in Toronto by approximately 11,600 tCO2e, the equivalent of converting over 10 million square feet of office space to net zero.

As part of the TransformTO Climate Action Plan, which outlines ways to improve the city’s health, grow the economy and improve social equity, district energy was identified as a key strategy. In 2017, Enwave was selected as a partner by Toronto’s City Council to help accelerate the implementation of the plan to reduce greenhouse gas emissions and make the city more resilient.

Enwave’s district energy system is the largest in North America. It serves 180 buildings comprising more than 40 million square feet through 4 interconnected downtown plants and 40 kilometres of underground pipes. The Pearl Street Energy Centre (PSEC) addition to the district energy system will expand Toronto’s district heating and cooling distribution and capacity using low carbon technologies, by installing 3600 tons of cooling and 62,000 Mbh (thousand BTU’s per hour) of heating using water source heat pumps (heat reclaim chillers). Enwave’s ‘Green Heat’ offering will be made possible by the installation of new assets that utilize waste heat while producing cooling and hot water.

The site offered some interesting complexities to be solved by the design team. The first was space constraints. As the existing Energy Centre did not have any space to house the new equipment, the only available space that could be used for the addition is a small corner on the lot where buried fuel oil tanks are present. A design was implemented to build over the tanks, one that would comply with the requirements of the Ontario Building Code and the Technical Standards and Safety Authority by leaving the ground level open for future removal of the tanks. All disciplines had to overcome many challenges due to space limitations, including structural, architectural, mechanical, and electrical.

A challenge for the mechanical design team centered on how to integrate the new heat pump system with the existing heating and cooling district system, as well as how to stage equipment without impacting Enwave’s existing customers and their stringent temperature requirements. Our solution was to design a false loading system to start and stage on additional heat pumps in order to avoid temperature spikes which would have negative impacts on customers’ critical data centre equipment.

According to the Canada Green Building Council, “it’s estimated that residential, commercial, and institutional buildings contribute 17% of Canada's greenhouse gas emissions today, and when building materials and construction are included, this level approaches 30%”. As the designers and engineers of these facilities, the AEC industry has an outsize role to play in ensuring the success of sustainable development.

HH Angus has a proven track record of promoting innovative and sustainable engineering solutions. We are committed to providing engineering solutions that reduce energy consumption and reduce or eliminate greenhouse gases.

Prime Consultant | Mechanical Engineering | Electrical Engineering

New assets use waste heat while producing cooling and  hot water | 3600 tons of cooling | 62,000 Mbh heating using water source heat pumps

Toronto, Ontario

Overcame site constraints through innovative design to comply with OBC and TSSA requirements | Integrated new heat pump system to existing system 

Ontario Engineering Project Award of distinction 2024  graphic
Image of enwave banner with partner logos
Image of revit site structure

Lonsdale Energy Corporation

Heat Recovery Feasibility Study

HH Angus conducted a study to evaluate the feasibility of exhaust air heat recovery from the Global Relay (GR) data centre facility at 22 Gostick Place in North Vancouver, BC.

Some of the key aspects of the study included:

  • The location and footprint of the heat recovery system components were studied within the context of considerable site constraints. The study evaluated the design, construction, and cost considerations for the implementation of the proposed heat recovery system.
  • We investigated available heat pump technologies that would be appropriate for recovering waste heat and would satisfy the LEC DES requirements.
  • The energy recovered would be used by a water source heat pump to provide hot water to the local LEC District Energy System (DES).
  • A water source heat pump system was proposed as the best solution to provide the ability to recover heat from the building ventilation system. The new system would recover heat from the GR facility and would transfer this recovered heat via a hot water loop to the local LEC DES.
  • Heat recovery is feasible for the facility and can provide up to 1,100 kW of heating capacity to the LEC DES.
  • Constraints to the design of the heat recovery system were also identified, and included:

(i) the quantity of air exhausted from the facility is not fixed and ranges at each exhaust plenum on a seasonal basis and depending on outdoor air temperature – this impacts how much heat can be recovered at a given time;

(ii) the minimum and maximum exhaust air temperatures range from 30°C to 43°C (86°F to 110°F) - the temperature of the exhaust air will influence how much heat can be recovered from the exhaust air; and,

(iii) the cross-sectional area available for the heat recovery coil - the more cross-sectional area that is available for a given amount of heat transfer, the less deep the coil must be (and less airside pressure drop penalty is incurred).

The study concluded that a purpose-built containerized heat pump system would be the most suitable solution to meet the needs of the project. This new containerized structure would be conveniently located adjacent to the GR facility and would exhibit the same architectural character as the existing facility. The proposed heat pump system would include one heat pump unit (based on Emerson Heat Pumps) and four heat recovery water pumps. Control valves, piping accessories, ventilation, lighting, and system controls would all be included in the proposed pre-fabricated containerized enclosure.

Outdoor hydronic piping would connect the heat pump enclosure to the GR facility and the proposed hydronic heat recovery coil system. The heat recovery coil system would consist of four new heat recovery coils placed within the existing facility exhaust air plenums. The existing exhaust fan motors would have to be upgraded in order to address the additional pressure drop introduced by the new heat recovery coils. This fan motor upgrade would also trigger upgrades to the existing electrical infrastructure.

Prime Consultant | Mechanical Engineering | Electrical Engineering

Size: 5,600,000 ft2 | Status: Ongoing

Vancouver, British Columbia

Feasibility study | Heat recovery

Confidential Client 

BIM Laser Scanning

HH Angus was engaged to create a 3D Revit model (LOD 300), accurate to reality, of the existing structure and visible HVAC, plumbing and electrical infrastructure. This model was delivered to the client for their use in 3D coordination of their high voltage switchgear replacement project.

The 17,000 ft2 area was scanned using a Faro S70 Laser scanner, with the scans subsequently registered using Faro Scene software to create point clouds. Point clouds were then processed in Edgewise modeling software and used to automatically extract and model walls, structure, piping, conduit and ducts, before being imported into Revit. This efficient process resulted in a very significant 60% reduction in modeling time. The remaining MEP infrastructure was modeled in Revit, with special attention paid to the location of the entry and leave points within rooms for all MEP infrastructure, in response to the client’s requirement.

One of the challenges of the project was the lack of easily accessible data required to create the Revit model. Recap pro or Faro Scene software is needed to review the point clouds and images; this software required licensing and installation on individual machines, which prevented it from being easily accessible to everyone on the project team. The software also requires additional computing power to run smoothly, and this presented an issue for machines that did not meet the software requirements.

Mechanical Room Point Cloud
Mechanical Room Point Cloud
Mechanical Room in Revit
Mechanical Room in Revit

Prime Consultant | Scan to BIM provider

Revit modeling of existing structure and visible HVAC, plumbing and electrical infrastructure

Toronto, Ontario

3D laser scanning

Seneca College of Applied Arts and Technology

Garriock Hall Mechanical Retrofit

Located on the King City campus, Garriock Hall renovations are part of Seneca’s on-going expansion. The retrofitted heating system provides improved comfort for the campus’ 5,200 students.

HH Angus was engaged as prime consultant for a retrofit at one of the campus’ main academic buildings. Our scope included replacement and upgrade to:

  • Twelve fan coil units, complete with additional coil elements
  • Approximately 30 hot water cabinet unit heaters located throughout the building, along with additional Building Automation System (BAS) integration
  • Dual-duct terminal boxes for approximately 2/3’s of the building. The terminal boxes themselves were upgraded from pneumatically controlled to digital controlled complete with BAS integration.
  • Domestic hot water system
  • Pool heating system

The project used low temperature heating water from a ground-source heat pump system. This increased the physical size of the replacement heaters, which required accompanying structural and architectural modifications.

Domestic hot water preheat was implemented to take advantage of the low temperature heating water from the heat pump system, and was implemented as part of the domestic hot water system replacement and upgrade. The upgrades included a new high efficiency condensing water heater paired with a heating water to domestic water heat exchanger.

The pool heating system was not operational prior to the project. It was made functional and upgraded to take advantage of the low temperature heating water available from the heat pump system, by replacing the heat exchanger and adding additional controls. 

Dual duct terminal boxes upgrades included replacing the terminal boxes to implement Variable Air Volume (VAV) control. In a few areas, existing single duct VAV terminal boxes were replaced with those equipped with reheat coils to facilitate occupant comfort.

The project timeline was aggressive, with engineering design starting late May 2019 and tendering in late August 2019. The project took advantage of the 2019 Christmas break to complete the majority of construction in order to minimize impacts to the occupants.

Image courtesy of Google Maps

Prime Consultant | Mechanical Engineering

Twelve fan coil units | ~ 30 hot water cabinet unit heaters | Additional BAS integration | Dual-duct terminal boxes, upgraded from pneumatically controlled to digital control, complete with BAS integration | Domestic hot water system | Pool heating system

King City, Ontario

Heating plant uses ground source heat pump to deliver low temperature heating water | Compressed project schedule to meet heating season deadline | Unique dual-duct HVAC system being modernized and upgraded for re-use


Bloor-Dundas District Energy Feasibility Study

HH Angus was engaged to conduct a feasibility study for a Low Carbon District Energy Plant serving a new, three million square foot mixed use residential and commercial development along Bloor Street in Toronto.

The full development is being implemented in several stages over ten years. HH Angus provided Prime Consultant and Mechanical and Electrical Engineering services, and developed a conceptual framework for the study.

The study considered a combination of traditional and renewable energy sources to provide heating and cooling, reviewing a range of options that included the following:

  • Condensing hot water boilers, efficiency up to 90-95%
  • Centrifugal water-cooled magnetic bearing chillers
  • Water source heat pumps (heat recovery chillers) to provide simultaneous cooling and heating
  • Air source heat pumps to provide simultaneous cooling and heating
  • Ground source heat pump system
  • Ambient loop system
  • Sewer heat recovery system
  • Combined Heat & Power (CHP) system to generate power using a gas-fired generator and to provide heat using waste engine heat, with overall generator efficiency up to 80%. CHP can be used as backup power source and to reduce energy cost during periods of peak cooling and electrical demand.

HH Angus conducted calculations of estimated heating, cooling and electrical loads, plus energy consumption for future development, establishing options for the arrangement of the District Energy plant, including provision for expansion to provide heating and cooling to future developments in the neighbourhood.

Our study scope also included tentative District Energy plant layout and area requirements, capital budget, operating costs and NPV estimates for each option, as well as analysis of results and corresponding recommendations.

Mechanical Engineering | Electrical Engineering

Size: Low carbon district energy study | Due diligence engineering report | Status: Completed 2018

Toronto, Ontario

Assessment of district energy plant designs to serve 3 million ft2 of mixed use development |
Calculation of estimated heating, cooling and electrical loads and energy consumption for future development | Analysis of results and corresponding recommendations for optimal design | Consideration of traditional and renewable energy sources