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Welcome to Cool-phase ®

Natural Cooling and Low Energy Ventilation

Cool-phase is a low energy cooling and ventilation system that creates a thermally comfortable, fresh and healthy indoor environment whilst reducing the energy consumption and running costs of buildings.

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Benefits of the Cool-phase system over conventional HVAC systems

Benefits

Low Running Costs

The system has low servicing, maintenance and energy costs, combined with a long life that provides an impressive payback on the capital cost of the system.

Energy and Carbon Saving

The Cool-phase system uses an energy efficient variable speed fan with no compressors, pumps or other energy intensive components. A 5A single phase mains supply is all that is required.

Healthy and productive

The Cool-phase system creates a healthy and productive environment by monitoring internal air quality and ensuring there is a supply of fresh air.

Modular Design

The Cool-phase system can be installed in modular spaces or large open plan offices, above a false ceiling or suspended below to suit a range of environments. It can also be installed and integrated with new or existing mechanical ventilation and cooling schemes to offer local decentralised ventilation whilst taking over some of the cooling duty thus improving air quality and lowering running costs.

Performance

The Cool-phase system is able to reliably meet requirements for thermal comfort, ventilation and energy efficiency in most scenarios.

No External Units

The Cool-phase system does not require any external units. This makes Cool-phase particularly suitable in applications where outside space, planning constraints or acoustic requirements are an issue.

No Refrigerants

The Cool-phase system does not use the coolants often found in conventional cooling approaches. Therefore Regulations controlling the use and disposal of refrigerants do not apply to Cool-phase.

Long Life

With a design life in excess of 20 years and a warranty of 5 years, the system provides customers with the reassurance that they have a long term solution to their cooling and ventilation needs.


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How it Works

Overview

The Cool-phase system uses the concept of a 'Thermal Battery' to capture and store heat. The Thermal Batteries use the latent heat property of materials to store large amounts of energy, which is charged and discharged by passing air through a heat exchanger. Materials that change phase at room temperature are frequently referred to as Phase Change Materials (PCMs).

Using PCM's to store and release thermal energy

PCM changes state from solid to liquid when exposed to temperature. During the day as warm air is passed over the PCM it absorbs thermal energy from the air to turn from a solid to a liquid thus cooling the air. Overnight as cooler air is passed across the PCM it releases the thermal energy it absorbed from the warm air during the day returning to its solid state. Thus providing a cooling cycle using only a low energy fan that is intelligently controlled.

Total cooling

The total cooling over a 24 hour period is the sum of the free cooling (when it is cooler outside than inside), the effects of night time cooling (when the fabric of the building is cooled down and the heat built up during the previous day is dissipated), and the use of the energy stored within the Thermal Batteries to temper the air.

Cooling cycle

Overnight the system uses cooler air to cool the space and charge the thermal batteries. Initially the following day the system uses direct external air cooling to cool and ventilate the space. As the external air temperature rises the system uses the thermal batteries to either maintain the temperature of the already cooled internal air or to cool the incoming warmer air if ventilation is also required.

Heat recovery cycle

In whenever the internal temperature exceeds a preset level, or at the end of the day when the space is unoccupied, warm room air is passed through the heat exchanger, charging the Thermal Batteries. The following day during ventilation, cool air from outside is passed through the heat exchanger, warming the air entering the space and reducing the load on the heating system.

Performance illustration

In this simplified model the black line shows the external temperature between 14 °C at night and 28 °C during the day. The building temperature is shown by the pink line peaking around 30 °C. The blue line shows a significant reduction in the peak temperatures within the space with Cool-phase installed. Cool-phase is not designed to match the performance of the Air Conditioning system, which is typically specified to maintain a temperature of 23 °C; however it has resulted in an 80 - 90% improvement in temperature for 10 - 20% of the energy usage of the AC system.

For more information download the data sheet

Download PDF

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Applications

Overview

The Cool-phase system can be installed in all Commercial sectors; new buildings or retrofit to existing ones, from small modular areas to large open plan rooms. The system can be suspended below a ceiling (a floor to ceiling height of 2.6 m or greater is recommended for the Fascia System), within a false ceiling void (a minimum ceiling void of 400 mm is required for the Suspended Ceiling System) or to an Exposed Void where the unit and duct work is supplied in a matte black finish.

Offices

The Cool-phase system has been designed to meet the requirements of clients who wish to have a greater level of control over internal temperatures than is achievable with other low energy approaches, but without the high energy and maintenance costs of conventional cooling solutions.

Corporate

The Cool-phase system can operate on its own to provide thermal comfort conditions or can operate alongside conventional cooling systems to provide fine level of climate control that even the most demanding client might expect, but still radically reduce running costs.

Retail

Retailers are under increasing demand to slash their energy consumption and Cool-phase has been shown to make significant savings compared to conventional cooling approaches.

Education

Each Cool-phase system includes CO2 monitoring as standard and can accurately control the level of fresh air within classrooms to provide the ideal teaching environment. The system is capable of meeting the requirements of BB101 and Priority School Building Programme (PSBP) even in tough areas, such as an IT classroom.


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System Types

Click the links to find out more

  1. Suspended Ceiling
  2. Fascia
  3. Exposed Void

A.) Duct: An acoustic insulated duct connects the Cool-phase system to the outside air.

B.) Recirculation and filter module: A G4 filter is positioned to remove particles from the incoming external air and re-circulated air. Volume control dampers manage the proportions of fresh and re-circulated air to maintain the optimal internal environment. Pressure sensors to indicate when dirty filter media needs to be cleaned or replaced.

C.) AHU: The Air handling unit contains an energy efficient EC fan, intelligent control system and sensors. The control system monitors indoor air quality, temperatures both inside and outside, and humidity levels. The AHU controls the flow of air into the building, and how energy is released or stored by the Thermal Batteries.

D.) Thermal Battery: The Thermal Batteries form a modular heat exchanger. This allows heat to be transferred from the air to the Thermal Batteries, or vice versa. The Thermal Battery module has no moving parts and does not require any power, therefore, they are highly reliable, have a long life and require minimal maintenance.

E.) Ceiling tile diffusers: When the system is mounted above a false ceiling, ceiling tile diffusers are used at the end of the PCM module. Inlet grilles are provided at the point where air is re circulated.

F.) Exhaust grille: An outlet for air to leave the space is required. This can be through an internal exhaust grille, which allows air to escape through the rest of the building or through a second external weather louvre with volume control damper.

A.) Duct: An acoustic insulated duct connects the Cool-phase system to the outside air.

B.) Recirculation and filter module: A G4 filter is positioned to remove particles from the incoming external air and re-circulated air. Volume control dampers manage the proportions of fresh and re-circulated air to maintain the optimal internal environment. Pressure sensors to indicate when dirty filter media needs to be cleaned or replaced.

C.) AHU: The Air handling unit contains an energy efficient EC fan, intelligent control system and sensors. The control system monitors indoor air quality, temperatures both inside and outside, and humidity levels. The AHU controls the flow of air into the building, and how energy is released or stored by the Thermal Batteries.

D.) Thermal Battery: The Thermal Batteries form a modular heat exchanger. This allows heat to be transferred from the air to the Thermal Batteries, or vice versa. The Thermal Battery module has no moving parts and does not require any power, therefore, they are highly reliable, have a long life and require minimal maintenance.

E.) Fascia and diffusers: Air diffusers are built into the units to ensure air can circulate around the room evenly and prevent uncomfortable draughts.

F.) Exhaust grille: An outlet for air to leave the space is required. This can be through an internal exhaust grille, which allows air to escape through the rest of the building or through a second external weather louvre with volume control damper.

A.) Duct: An acoustic insulated duct connects the Cool-phase system to the outside air.

B.) Recirculation and filter module: A G4 filter is positioned to remove particles from the incoming external air and re-circulated air. Volume control dampers manage the proportions of fresh and re-circulated air to maintain the optimal internal environment. Pressure sensors to indicate when dirty filter media needs to be cleaned or replaced.

C.) AHU: The Air handling unit contains an energy efficient EC fan, intelligent control system and sensors. The control system monitors indoor air quality, temperatures both inside and outside, and humidity levels. The AHU controls the flow of air into the building, and how energy is released or stored by the Thermal Batteries.

D.) Thermal Battery: The Thermal Batteries form a modular heat exchanger. This allows heat to be transferred from the air to the Thermal Batteries, or vice versa. The Thermal Battery module has no moving parts and does not require any power, therefore, they are highly reliable, have a long life and require minimal maintenance.

E.) Fascia and diffusers: 4 way diffusers.

F.) Exhaust grille: An outlet for air to leave the space is required. This can be through an internal exhaust grille, which allows air to escape through the rest of the building or through a second external weather louvre with volume control damper.

For more information
download the system type pdf

Ventilation, Cooling & Heat Recovery

Click the links to find out more

  1. Ventilation
  2. Outside Air Ventilation & Cooling
  3. Re-circulation & Cooling
  4. Heat Recovery

A.) Operation: Should the CO2 levels within the space rise above a preset level, the system will open the external damper and vary the fan speed until the desired CO2 levels are achieved, providing ventilation and direct air cooling proportional to the requirements of the space.

B.) External air: Is pulled directly in to the room passing through the filter assembly.

C.) Distribution: The air is distributed to the room via grilles or diffusers depending on model.

A.) Operation: This is used when the temperature differential between inside and outside air is insufficient to cool the space but the outside temperature is still lower than the temperature within the room.

B.) External air: Air is passed from outside over the Thermal Batteries to drop the temperature of the air and cool the room sufficiently.

C.) Distribution: The air is distributed to the room via grilles or diffusers depending on model.

A.) Operation: This strategy is used when the temperature outside is higher than inside.

B.) Re-circulation: Internal air is re-circulated from within the room and passed through the Thermal Batteries to provide cooling. A proportion of air is drawn from outside to maintain ventilation levels, a CO2 sensor and preset level determines the minimal amount of ventilation to be provided.

C.) Distribution: The air is distributed to the room via grilles or diffusers depending on model.

A.) Operation: In winter, the Cool-phase system works in reverse, trapping waste heat and using it to warm up cool fresh air entering the building. Whenever the internal temperature exceeds a preset level, or at the end of the day when the space is unoccupied, warm room air is passed through the heat exchanger, charging the Thermal Batteries.

B.) Ventilation: When ventilation is required, cool air from outside is passed through the heat exchanger, warming the air entering the space and reducing the load on the heating system.

C.) Distribution: The air is distributed to the room via grilles or diffusers depending on model.

Building Simulation

Navensys

Monodraught’s own software package NAVESYS allows our Design Engineers to apply climate data from almost any weather station in the world, scale it appropriately, and to input the type and geometry of a building and zone, the constituent parts of its envelope, fabric and the patterns of occupancy. The results determine if statutory requirements or guidelines, such as Building Regulations or BREEAM, for ventilation rates, internal air temperatures and carbon dioxide concentrations are achieved. (required information PDF)

IES

Monodraught’s in house design teams have the ability to utilise IES VE to model complex building geometry and simulate the anticipated internal conditions in accordance with industry recognised external weather data. (required information PDF)

IES Cool-phase Performance Component

To help architects and consultants deliver low maintenance, energy efficient designs within the built environment, Monodraught have collaborated with IES to develop The Cool-phase Performance Component. A user guide is available via PDF download.

Want more information about Monodraught & IES? 

How Cool-phase qualifies for BREEAM

This document was authored to provide information on how Cool-phase Low Energy ventilation and Natural Cooling systems qualify for BREEAM New
Construction-Non-Domestic Buildings 2011.
For more information download the data sheet

Download PDF

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Controls

Controls & User interface

  • Wall mounted user controls with room temperature, humidity and CO2; sensors.
  • Cool-phase control system including temperature and humidity sensors.
  • Master/slave mode to control multiple units in a single zone.
  • Optional connections to heating controls.
  • Optional 'traffic light' indicator for windows.

Wiring Requirements

  • Single phase mains with switched 5A fuse spur supply, positioned within 1m from AHU footprint.
  • CAT 5E network cable between unit and user interface.
  • CAT 5E network cable between slave and master units.

Optional BACnet connectivity

  • The BACnet module allows a Cool-phase system to be installed on to a BACnet network. Each Cool-phase system has its own unique address on the BACnet network. Where multiple installations of Cool-phase units are located in one room, the Cool-phase units may be linked as Master/Slave configuration to form one system. In this instance the Master system will collate and display the BACnet information from the Slave systems.
  • The BACnet module requires an RJ45 ethernet connection (by others) from the central BACnet gateway to the AHU of the Cool-phase unit.
  • The following information is available for display over BACnet: Room temperature, Room CO2 level, Cool-phase operation mode, External/Duct air temperature, Fault indication, Cool-phase charge status and Filter status.

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Case Studies

Sheffield Hallam University (Suspended Ceiling)

The system has dramatically reduced CO2 levels and is controlling previously excessive room temperatures well within normal comfort zones. All this while reducing energy consumption by up to 90 % compared to conventional mechanical cooling systems.

Prospects College (Fascia)

Ayshford Sansome Associate Rob Westbrook: "Monodraught emerged as the preferred candidate, meeting our brief in terms of cost, sustainability and the potential as an educational source". The final design included Cool-phase due to the expected heat gains.

Notre Dame School - London (Fascia)

Two Cool-phase systems were installed in an IT classroom in April 2011. The classroom (approx. 70 m2) has moderately high internal heat gains through IT equipment and glazing.

Anglia Ruskin University

The two Cool-phase units installed in the Bryant building consumed 197.6 KWh of electricity between 25th January and 2nd September 2013.

Assuming a standard electricity tariff of 0.11£/KWh, that amounts to total energy costs of £21.74, or 70p a week.

Bournemouth University

The two Cool-phase units installed
in the Science Lecture Room used a combined
138.5 KWHs of energy across the logged period.
 
Assuming 0.11 £/KWh that amounts to £15.24 or an
average of £0.25p a week.
For more information download the data sheet

Download PDF

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Contact Us

Specification & Performance

Performance Specification

  • Normal ventilation rate (occupied hours): between 0.1 to 0.26 m³/s.
  • Maximum ventilation rate (recharge mode): 0.35 m³/s.
  • Thermal energy storage: 6 to 10 kWh dependant on model.

CPNF Fascia Specification

Cool-phase System designed to suit a below ceiling type installation.

CPNSC Suspended Ceiling Specification

Cool-phase System designed to suit a suspended ceiling type installation.

CPNEV Exposed Void Specification

Cool-phase System designed to suit an exposed ceiling void type installation.

For more information download the data sheet

Download PDF

Installation & Maintenance

Installation requirements

  • Recommended minimum floor to ceiling: 2.6 m (Fascia)
  • Minimum ceiling void: 400 mm (Suspended ceiling)
  • Weight: 215 to 380 kg: (dependant on model)
  • Minimum supply duct size: 500 mm x 150 mm (W x H)
  • Exhaust: Internal or external grille specified to suit.

Installation Process

  • The Cool-phase systems are designed to suit new build or retrofit installations. Supplied with each system are fixing kits which utilise Gripple wire fittings allowing flexibility in the positioning of the systems. Fixing kits are available to suit most applications.
  • There is a requirement for the provision of supply air from outside and exhaust air from the room itself. These air paths can be provided by either facade or roof apertures. During the design phase we will offer guidance as to the most suitable supply and exhaust options available.

System requirements

  • Fresh air supply: connection to clean outside air source, inlet to be positioned away from sources of pollution and heating, eg. Kitchen exhaust.
  • Inlet: Weather louvre (standard grille size 800 mm x 300 mm) or roof cowl.
  • Filtration: G4 bag filter.

Monodraught installation service

  • Monodraught provide a complete installation service which includes : site survey, project specific working drawings, risk assessment and method statement provision. We include for all scaffolding up to 3m high as standard and a full commissioning process to ensure correct system operation.
  • Monodraught have directly employed installation engineers and can provide a complete turnkey installation with in-house project management facilitating a single point of contact from order through to handover.

Maintenance

  • The Cool-phase systems are designed to be low maintenance with the only serviceable component being a G4 low pressure bag filter which is available as a stock item.
  • A yearly inspection is all that is required with the filter being changed during this time. However in some urban locations the filter may require changing more frequently.
  • A five year warranty is provided as standard for all Cool-phase systems (excluding electrical items which have a one year warranty).

Servicing

  • Monodraught can provide a full maintenance and servicing agreement which includes a yearly operational inspection and filter media change. Within the service visit we include for upgrading software and downloading performance data from the previous year.
  • Following the servicing visit a full report is provided which includes information on the area being served such as average temperature, CO2 levels, energy consumption and carbon saving provided.
  • As part of this package a service hotline is available with discount included for any replacement components outside of warranty.