What are the running costs associated with the Colt-Caloris system?
The Colt-Caloris system is currently undergoing fully independent investigation and testing to determine the system running costs. These demonstrate annual running costs below that of VRF and certainly four pipe fan coils. From initial monitoring and calculations we state the running costs in part-load conditions (outdoor temp approx. zero to 20C) are much better than VRF since the net COP of the Colt – Caloris units is better at part-load conditions. Further, in part-load the central heat-pump is hardly (or not) running at all. Records of 2005 suggests a cost of some 5 per m pa. Whilst in full-load operation (cold frost and heat wave) the Colt-Caloris system will perform similar to VRF, though still better than fan coil designs, including chillers and boilers. Unlike VRF, additional thermal buffer will further reduce energy costs.
