COOLING | NEWS Studies target Symposium T here are only two months to go until the 2019 CIBSE Technical Symposium gets under way at the University of Sheffield. The 9th CIBSE Technical Symposium, from 25-26 April, will be an opportunity to examine and share research, development and applications that will drive change in the regulation, creation and maintenance of the built environment (https://cibse.org/symposium). It will also present evidence of where there are still clear opportunities to benefit from established practices. Four papers on cooling are currently being reviewed by the symposium planning committee. They are: Cooling with heat recovery for electrical cable tunnels in cities Gareth Davies, London South Bank University This paper explores how additional active cooling may be applied to reduce temperatures in tunnels running under cities, allowing higher electrical loadings to be used. With electrical power often distributed by underground cable tunnels, significant quantities of heat are often generated within them, increasing tunnel air temperatures. These are generally controlled using outside air introduced through ventilation shafts and circulated by fans to prevent overheating of the cables and to enable service/maintenance personnel to access the tunnels. The paper looks at a preliminary study, focusing on London, that investigates using a heat exchanger to extract heat from the outside air entering the ventilation shaft. The low temperature heat extracted can be upgraded using a heat pump to a temperature level that enables its use in a district heating system. Carbon and revenue cost savings are also discussed. Overheating in residential developments: a comparative study highlighting how evaporative cooling can address this inefficiency Laurence Cockman, Colt International This looks at how a comparative study of identical developments gave the opportunity to assess evaporative cooling solutions to overheating. The study examines two blocks at the Kidbrooke Village Project that were identical in their orientation, layout and use, giving an opportunity to analyse, mitigate and advise on how to resolve overheating. The blocks provide perfect conditions to monitor and compare the levels of internal temperature, relative humidity and external temperature over a 12-month period. An initial survey by Berkeley Homes attributed overheating to lighting gains and heat-loss transfer from the low temperature hot-water pipe network. Colt International designed a solution to address this. One block had a Colt CoolShaft evaporative cooling system installed to provide pre-cooling of air supplied to the corridors, while the other had environmental fans for the PRODUCT NEWS Kelvion announces NP150X plate heat exchange Manufacturer Kelvion has launched the NP150X plate heat exchanger, which has a very shallow plate gap and small pitch in the design to ensure highly turbulent flow and good transfer at very small temperature differences. The OptiWave design enhances this effect by providing a highly uniform flow across the entire plate width, says Kelvion, which claims the heat exchanger plate achieved higher NTU values than the sister models of the NT and NX series. It is suited to high-rise building cold supply, or data centre cooling, where gasketed plate heat exchangers for these applications require peak performance of heat transfer while withstanding high system pressure. The Kelvion NP150X is available in plate material 1.401 and 1.4404 (US: AISI304 and AISI316L), and in thicknesses of 0.4, 0.5 and 0.6mm. It is suitable for a test pressure up to 42 barg. Trio on offer from Trane Trane has introduced three compact chillers and heat pumps to its City range, which is part of the Ingersoll Rand EcoWise portfolio of products. The City Comfort, Process and Booster use R-1234ze refrigerant, and are designed to heat and cool small commercial buildings, industrial facilities and industrial processes. According to the company, they are 38% more efficient at part-load than the 2021 Ecodesign requirements. The Comfort is a chiller for office buildings, hospitality, district cooling andheating, and data centres, and can be used in small industrial processessuch as food and beverage and small agricultural production, including wineries. Process offers highly efficient process cooling for food and beverage, warehouses, cold storage and ice rinks, and can freeze down to -12C. Booster is a water-to-water heat pump and delivers hot water between 50C and 80C. It is designed for applications such as high-temperature heating, sanitary hot-water supplies, district heating and heat-recovery cascades. Mitsubishi Electric adds to chiller range and expands Mr Slim Mitsubishi Electric has added to its range of Climaveneta chillers. The i-NX air-cooled chiller has standard and low-noise options, while the smaller i-BX air-cooled chiller is available in single and three-phase variants. The new models use inverter-driven compressors, which Mitsubishi Electric says ensure maximum efficiency at part loads. Both chillers are ErP-compliant up to 2021. The i-NX low-noise version delivers a reduction up to 7dBA over standard models, while the i-BX range offers capacities from 4kW to 35kW. Mitsubishi Electric has also added R32 Standard Inverter and Inverter models to its Mr Slim split-system air conditioning range. The Standard Inverter outdoor unit is available from 2.5kW to 14kW and includes extended pipe runs on larger models. It can connect to a range of indoor units, including ceiling cassette, concealed, and suspended, and wall-mounted models. The Inverter outdoor units are available from 7.1kW to 14kW as ceiling cassette systems. Their Replace Technology means installers can move to the new systems while maintaining existing pipework. 44 February 2019 www.cibsejournal.com CIBSE Feb19 pp43-45 Cooling News.indd 44 25/01/2019 16:04