COLT-CALORIS - WATER SOURCE HEAT PUMP SYSTEM

The system components and their features and benefits

A: Local Heat Pumps	B: Neutral temperature Flow & Return Water System	C: Central Heat Pump(s)

Converts the energy in the water to energy in the air Total Heat Recovery (Building's thermal mass and Energy exchange between units) Favourable water temps = High system COP Unlimited number of units Single unit failure has no effect on the overall system Typical NR from 28 - 38 dB(A)	Closed pipework system Operating temperatures 15 - 30 deg C No insulation Two pipe (polyethylene) system Unlimited pipe length Easy Install Installation time reduced Installation costs reduced Expected life span of 50 years Embedded in concrete to utilise the building's thermal mass	Converts the energy in the air to energy in the water Only in operation 8-15% of overall running time Purpose is to remove excess energy or add required energy Can also utilise existing boiler or chiller system Ground Source-of course! No limit on system size- Just modularise more units

More detail on the system components:

1) Indoor heat pump unit
Each internal space or room contains its own local unit, installed either horizontally within the ceiling void (horizontal model), or as a console unit positioned on the floor (vertical model). The vertical model can be cased or uncased

Within the Colt-Caloris unit, fresh or recirculating air is filtered, cooled or heated as necessary and may be supplied indirectly through spigots, ducts and/or grilles into the internal space.

The reverse cycle heat pump includes a refrigerant circuit with both refrigerant to air and refrigerant to water heat exchangers. A reversing valve enables each heat exchanger to act as either an evaporator or a condenser. A small charge of refrigerant circulates only within each unit, unlike other systems which pump refrigerants throughout the whole building.

2) Central external heat pump
The purpose of the central external heat pump is to maintain the optimum temperature in the water system between 15° C and 30° C, but since the building's mass helps to maintain the water temperature, this heat pump is rarely in operation. For most of the year, the central heat pump will remain on stand by.

Operation in Summer

During the summer months the central heat pump operates like a chiller unit but with greater efficiency, dissipating heat. Most water chiller systems operate around 5° C to 14° C whereas the Colt-Caloris system only starts up when the temperature exceeds 28° C to 30° C. It is much easier to cool water at 28° C than it is at 6° C. As a result the heat pump works at a higher efficiency for less time during the day. As soon as the water temperature reaches the normal specified level, the unit stops and waits until the water becomes excessively warm again.

Operation in Winter

In winter, most internal rooms will require warm air. The local heat pumps take the heat energy out of the water system which finally causes a heat deficiency within the system. The system copes with this by taking the cold external air and cooling it further, then transferring this heat energy into the water system.

The Colt central heat pump units are available from 22 kW up to over 1,300 kW depending on the size of the system.

3) Flow & Return Water System
The basic principle of the Colt-Caloris system is that water is circulated around the building between the local units and the central heat pump at between 15°C to 30°C.

All the local units and external mounted heat pumps are connected by a main two pipe, flow & return water system system. With the temperature of the water being neutral, neither insulated piping nor copper piping is needed.

Plastic polyethylene piping offers many cost and reliability benefits. The pipes can be quickly installed into the system without any risk of condensation.

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