Porcupine Plain Carragana Hospital

Lighting
The following table provides descriptions of the existing and proposed lighting conditions for different areas of the facility.

Boiler Control & Summer DHW Heater
Overview
Heating to all areas is provided by hot water supplied by two “Volcano” gas-fired boilers rated at 2094MBH. Both boilers are individually controlled by temperature sensors located in the hot water supply with hi temperature limit of 180ºF and low temperature limit of 160ºF. Currently there is no indoor / outdoor control and both boilers run simultaneously. There is a parallel pump configuration serving the radiators. Hot water is also serving the DHW heat exchanger, for that reason one boiler is running during summer. DHW re-circulation pump is being shut off at night.

Scope
Install a new indoor / outdoor controller and interlock for more efficient staged operation. As well a small ‘summer’ DHW heater will be installed so that the main hot water boilers shut down in the summer months.

Pipe Insulation
Overview
There are currently several hundred feet of un-insulated hot water piping running in the crawlspace of the facility. These pipes radiate heat into the crawlspace which causes the area to overheat. As a result, the ventilation fans to run more than necessary. The radiant heat also moves though the floor of the facility causing the cooling systems to operate more than necessary. Insulating these pipes will save energy through increased system efficiency and reduces operation of peripheral systems.

Scope
Approximately 300’ of hot water piping in crawlspace will be insulated (140' @ 2" dia., 30' @ 2.5" dia., 60' @ 4" dia., 60' @ 1.5" dia.).

Building Automation Upgrade
Overview
Currently electric controls were installed to command both boilers, while pneumatic controls govern the operation of the AHU.
Scope
A new Honeywell Excel 5000 building automation system will be installed to schedule and control the major HVAC equipment with a networked operator interface that is connected to the main hub in Tisdale. The new controls will improve the control of the heating water, allowing for an outdoor ambient temperature reset schedule. Pumping schedules will also be implemented with the new controls to ensure that the main and subsequent circulation pumps are turn off during non-heating months. Also, air handling units will be scheduled based upon a daily schedule and seasonal schedule. The boiler plant will be automated with an outside air reset and summer shutdown, and the boilers & heating pumps will operate on an occupied/unoccupied schedule based on OAT.

Main AHU
Overview
Ventilation for the facility is provided by a constant volume mixed air handler with supply and return fans, and pneumatic controls. A 2-stage D/X cooling coil provides cooling and a heating coil with a heating circulation pump and a 3-way valve controlling hot water flow through the coil provides heating. There are also a reheating coil and a pan cold water humidifier in each branch of the two supply ductwork. The set point of air supply temperature in one branch was high (55ºC) and the main electric spray steam humidifier (30kW) is not functional. Filters were plugged at the time of the audit and heating coil was approximately 40% dirty and needs to be cleaned.

Scope
8 zone dampers and occupancy sensors will be installed in the selected areas and will be programmed to open at 6:00am and close at 6:00pm. A VFD will be installed on the supply fan (7.5hp, 208/3, 21 Amp) and return fan (0.33hp, 115/1, 6.4 Amp) and applicable exhaust/return fans will be interlocked and configured with override control. All necessary DDC controllers and points will be added.

Parking Plug Control
Overview
There are 7 duplex parking plugs, serving 14 parking stalls, that are 50% occupied during the winter months. There are currently no controls on these plugs.

Scope
IPLC controllers will be installed to replace 7 duplex receptacles and programmed to cycle 40% of the time when the temperature is between -5C and -15C, 70% of the time between -15C and -25C and 100% of the time when the temperature is -25C or colder.

Building Envelope Sealing
Overview
An investigation to upgrade the current conditions of the building envelope was conducted by CANAM Building Envelope Specialist. The results of this investigation have uncovered several areas where the building envelope can be upgraded in order to reduce heating costs. Most of the areas where improvements may be made within the confines of the performance contract involve low cost sealing of identified cracks around doorways.

Scope
The scope of work detailed by CANAM recommends the weather sealing of 9 exterior doors and the sealing of 80’ of roof/wall in 2 lines. Additionally a 8’ x 4’ section of soffit was found to be open to the outside and will be sealed accordingly.

Perimeter Radiator Reflectors
Overview
Wall areas, behind the perimeter steam radiators, are significantly hotter than other wall areas within the building. These hot areas transmit significant amounts of heat to the outside thus reducing the effectiveness of perimeter radiation.

Scope
Reflectors designed specifically for application on walls behind heating radiators will be installed to reflect energy back into the building space. In addition, the insulating pockets of air behind the heat reflectors further reduce heat losses normally due to convective and conductive processes. These reflectors will greatly improve the effectiveness of the existing radiators, potentially allowing the heating loop temperature to be reduced and thus increasing the overall heating system efficiency and occupant comfort.

Upgrade Garage Exhaust (VFA)
Overview
The current garage area exhaust system is inadequate for the space, resulting in potentially dangerous concentrations of CO and CO2.

Scope
A dedicated ventilation fan will be installed, along with CO and CO2 sensors. While this measure will address an important facility issue it will not result in any capital savings and so is considered a capital upgrade.
 

Backflow Prevention (VFA)
Overview
Backflow occurs when the water flows in the opposite direction from its normal flow. The cause of a backflow is a change in pressures. This reversed direction of water flow may allow contaminants to enter the drinking water system through cross-connections. Backflow Prevention is a strategy whereby a valve is placed in the domestic water supply line of a given facility in order to prevent contamination by pollutants due to ‘backflow’ in the system. Examples of testable backflow preventers used for medium to high hazard processes include: reduced-pressure principle assemblies, double-check valve assemblies and pressure vacuum breaker assemblies.

Scope
Backflow Prevention double-check valve assemblies will be installed in both the domestic and fire pump water supply pipes in order to comply with the 1995 National Building Code part 7.6.2.3 and CSA.Z317.1 Canadian Standards Association Special Requirements for Plumbing Installations in Health Care Facilities, Section 6.3.3.5.