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Cool-phase Hybrid: Utilising Phase Change Material and integrated Heat Pump

13.03.15

For the Ultimate in air quality control at 20% of the running cost of A/C

What is Cool-phase Hybrid?

Cool-phase is an award winning, low energy cooling and ventilation system that creates a comfortable, fresh and healthy indoor environment that can significantly reduce the running costs of buildings.

Cool-phase Hybrid is an innovative enhancement that links high efficiency air to water heat pumps with our natural cooling phase change material system.

The Cool-phase system is a natural cooling system that uses night time cooling to charge thermal batteries which contain phase change material (PCM). The natural cooling system combines the cooling effect of the PCM with fresh air provided

by the integral air handling unit of the Cool-phase system to provide low energy ventilation and cooling. This combination will not match the thermal performance of air conditioning but dramatically reduce energy consumption whilst offering an improvement on thermal conditions.

Passive or natural design solutions are designed to take in to account the buildings properties, the local weather conditions and the internal loadings such as electrical lighting and occupancy levels. If for instance the weather is particularly hot, passive
or natural design solutions will provide elevated temperatures above fine set point limits such as 24°C.

For clients seeking such fine tolerance of set point control, the Cool-phase Hybrid system firstly guarantees night time charge of the thermal batteries during peak summer periods but also allows additional top up cooling to be provided during the day. This integration of cooling technologies ensures optimum efficiencies and maintains tight set point control.

How does Cool-phase Hybrid work?

Cool-phase uses a thermal energy store which utilises a Phase Change Material (PCM) combined with an intelligently controlled Air Handling Unit to actively ventilate and cool the building. The Cool-phase system can maintain temperatures
within a comfort able zone, while radically reducing energy consumption by up to 90% compared with a conventional cooling system.

The effect of adding thermal mass to a building combined with measures to control internal and external heat loading, can be a very effective method of ensuring that the building meets requirements for thermal comfort. However during a period of hot weather, temperatures will invariably rise over time, as there is no method of actively dissipating the buildup of heat.

Therefore the effect of adding thermal mass can diminish over a warm spell, although the building takes longer to heat up during the day, it will also take longer to cool down at night time and therefore not all of that heat may be
dissipated by the following day.

Unlike passive applications where thermal mass is simply added to a building, the Cool-phase system is able to intelligently control how energy is stored and released from the thermal store, by using a heat exchanger and mechanical ventilation.

The heat built up during the day can therefore be released at night and the thermal energy store recharged. When this is combined with the effects of free cooling and night time ventilation, the result is a system that can reliably maintain temperatures within comfort zones while radically reducing energy consumption.

Our advanced control system maximises the use of thermal storage through the use of phase change material, fresh air and high efficiency heat pumps. The Cool-phase Hybrid ensures excellent internal comfort conditions and optimum air quality levels at the most efficient energy use possible.

The Cool-phase system is mounted within the room as a decentralised ventilation system. Each Cool-phase Hybrid unit is fitted with a low pressure heat exchanger within the Cool-phase recirculation module. The control system senses the room temperature, room air quality level and external air temperature, automatically selecting the most efficient method for ventilating and cooling the room.

What is a Monobloc Heat Pump?

The Monobloc heat pump provides chilled water during summer periods and hot water during winter periods allowing additional heating to be provided by the Cool-phase Hybrid system in winter periods.

  • The Monobloc heat pump is fully integrated with the Cool-phase system.
  • Integrated control logic.
  • DC inverter compressor.
  • R410A refrigerant within heat pump module only limits the use of refrigerants.
  • Operates as low as -20°C.

 

The Monobloc heat pump is connected to the Cool-Phase system via a heat exchanger. The heat exchanger is specifically designed and optimised by Monodraught’s engineers for this application and it is integrated within the Cool-phase units. The heat pump can therefore channel chilled or hot water to the heat exchanger inside the Cool-phase
system. The heat exchanger works in conjunction with the Cool-phase’s existing recirculation unit, allowing
air to be supplied to the room or to charge the thermal batteries (PCM), depending on the requirements at a given time.

Why choose Cool-phase? 

  • Very low running costs.
  • Highly energy efficient system.
  • Long Life and a warranty of 5 years.
  • Modular, scalable and adaptable design.
  • Creates a healthy and productive environment.
  • Emission savings and carbon reductions offering BREEAM credits.
  • Demand control ventilation enhances energy efficiency.
  • Environmentally friendly and sustainable solution.

Why choose Cool-phase Hybrid?

Added Benefits of the Hybrid System

Precise Temperature Control: This new system allows for more precise room temperature control as it will have the capacity required to achieve a set point temperature with consistency.

Capacity to Achieve Set Point Temperature with Consistency: In cooling mode, the thermal batteries are charged during the night when the temperature drops down. However, during certain times in the summer period, the temperature at night, especially around relatively warm buildings, cannot drop below a certain point and allow for the batteries to be charged. In such cases, the Cool-phase Hybrid system can utilise the heat pump to charge the thermal batteries, by allowing cold air to pass through them.

Charging of the Thermal Batteries when External Conditions Will Not Allow: The same principle applies during the heat recovery mode. If the inside of the building is not warm enough to provide enough heat to the batteries, the heat pump can supply air to the thermal batteries in order to fully charge them.

Provide Direct Heating or Cooling when the Thermal Batteries Run Out of Capacity: In the case that the thermal batteries run out of capacity, the new system will have the capability to cool or heat the room directly by supplying air at the required temperature.

Reduce the Number of Cool-Phase Units Required for an Application: The new system will allow the amount of Cool-phase units required for a given application to be reduced.

Support of Multiple Cool-Phase Systems: Capability of supporting multiple Cool-Phase Hybrid systems with one heat pump (Depending on heat pump capacity: 5kW-7kW).

Keeps running costs and CO2 emissions to a minimum.

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