ACR Journal

June | July 2021 ADVERTORIAL 38 Modern office, education, and industrial sites, as we know, are internal heat energy generators. Andy Bradison of Cool Designs Limited explains Superb building quality and insulation techniques, combined with equipment and staffing gains, create a need to remove excess heat energy in the form of direct cooling to areas. Using all that lovely heat Volume 7 No.4 seem not to concentrate on its waste. We simply dump it into the atmosphere, benefiting only the birds. Cockatoos in Newcastle – now there`s a thought. Why not re-use ` all that lovely heat `. Placing the comms room lead unit(s) onto the VRF heat recovery system, having multi compressors and excellent resilience, whilst retaining a separate split system for standby (N+1), allows the heat energy that was once discharged to the atmosphere to be re-applied. That must be a good thing. Time clock & run hours are often cited as the reason comms heat is thrown away. A system operating on a timer runs the AC areas eight hours a day, yet the comms room can run 24hours, even down to the small wall mounted fan coil. Hot w ter too can be available 24hours. This is because technology has moved on. The turndown ratio of the VRF outdoor is exceptional. Consider this from the standard Toshiba Airs Selection file. The example shows a 3-Pipe Heat Recovery VRF, nominally rated at 100kW. heat energy generators. ment and staffing gains, to areas. rbed into a more extensive s sound engineering sense. omms/Server rooms; bit. ntial comms and servers yet phere, benefiting only the , arate ng. wn he coil. moved the The myth-busting realisation that server/ comms room heat can be absorbed into a more extensive system and re-used, possibly into heating water, is refreshing a makes sou d engineering sense. Duty and standby split systems often appear as the `industry norm` for Comms/ Server rooms; however, his may w ll be based on outdated technology and design habit. We have electricity generated heat as a byproduct of operating our essential comms and servers yet seem not to concentrate on its waste. We simply dump it into the atmosphere, benefiting only the birds. Cockatoos in Newcastle – now there`s a thought. Why not re-use `all that lovely heat` Placing the comms room lead unit(s) onto the VRF heat recovery system, having multi compressors and excellent resilience, whilst retaining a separate split system for standby (N+1), allows the heat energy that was once discharged to the atmosphere to be re-applied. That must be a good thing. Time clock & run hours are often cited as the reason comms heat is thrown away. A system operating on a timer runs the AC areas eight hours a day, yet the comms room can run 24hours, even down to the small wall mounted fan coil. Hot water too can be available 24hours. This is because technology has moved on. The turndown ratio of the VRF outdoor is exceptional. Consider this from the standard Toshiba Airs Selection file. The example shows a 3-Pipe Heat Recovery VRF, nominally rated at 100kW. • 2 no Under-ceiling Comms Room (often preferred for blowing over server racks) • Door Curtain (for 2m wide door) • 2 no O•ce Area Cassettes • 2 no Domestic Hot Water Modules (20kW available – corrected) • 1 no Radiator Circuit Module (10kW available – corrected) • 1 x Reception Floor Mount Then we have an enjoyable dilemma – where to use `all that lovely heat` This 100kW VRF 3 Pipe Heat Recovery system can absorb over 22+kW of heat from a comms server room, some 6kW from AHU (likely summer only), and redeploy that heat within the refrigeration system to domestic and radiator circuits. The finite controllability of the refrigeration system absorbs heat energy and then transfers it to areas where it`s needed. It can `top up` any heating shortfall, for instance, if the comms room load reduces or the AHU is not in cooling mode. It can also, where relevant, and all other avenues for heat energy usage, reject the excess not being used. Had the system not re-used the 28+kW absorbed heat from Comms & AHU, this would have been simply thrown away and be separately generated. It is a new debate, too, as to where to input this `free heat` in the SBEM or similar calculation. Is it waste heat or other? The outdoor unit already has excellent SEER + SCOP. Andy Bradison, regional specification manager, Cool Designs Limited

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