Chief Engineers Event Friday 27 June Standard testing of Heat - PowerPoint PPT Presentation

Chief Engineers Event Friday 27 June Standard testing of Heat Interface Units Colin Judd Principal Research Engineer BSRIA Test & Operations DD: 01344 465659 E: colin.judd@bsria.co.uk 1 Making buildings better

Introduction Subjects being covered • Laboratory based testing of HIUs • European Standard and test method used for HIU testing • Examples of HIU configurations • Site based testing of HIUs • The future of HIU testing? 2 Making buildings better

Laboratory Testing Tests carried out • Thermal performance – cooling, heating and domestic hot water • Differential pressure across primary and secondary circuits • Plate deflection within the heat exchanger • Power drawn by integral pump and controls • Dead – head pressure across the integral pump 3 Making buildings better

Thermal Performance Test • Primary circuit – Volume flow rate HIU – Inlet temperature – Outlet temperature • Secondary circuit – Volume flow rate – Inlet temperature – Outlet temperature 4 Making buildings better

European Standard & Test Method Test Standard BS EN 1148:1998 “Heat exchangers - Water to water heat exchangers for district heating - Test procedures for establishing the performance data” • Focuses on plate heat exchanger only • Does not include chilled water conditions • A range of test temperatures listed • Multiple test points for heating and domestic hot water • Requires primary/secondary imbalance of ≤ 3% 5 Making buildings better

Plate Heat Exchanger • Consist of: – Two endplates – A set of internal plates – Primary inlet and outlet – Secondary inlet and outlet Thermal envelope 6 Making buildings better

Heat Interface Units • HIUs can consist of: – Multiple plate heat exchangers – Pipework – Integral pump – Expansion vessels – Two port control valves – Flow regulating valves – Thermostatic valves – Heat meters Thermal envelope 7 Making buildings better

European Standard & Test Method BSRIA test method • Bespoke document • Applies the relevant sections of BS EN 1148 • Specifies all the test points • Covers additional tests 8 Making buildings better

HIU Configurations • Twin plate heat exchanger • Single plate heat exchanger – Common primary – Space cooling only – Two-port control valve – Space heating only – Space heating • Single plate heat exchanger – Domestic hot water – Two-port control valve o Cylinder o Hot water cylinder o Instantaneous o Space heating 9 Making buildings better

HIU Configurations 10 Making buildings better

Plantroom HIUs • LTHW and CHW in one skid – 20+ floors – One HIU on each floor 3 m 11 Making buildings better

Site Based Testing • Same principal as lab based testing • Challenges – Accessibility – Installing sensors – Achieving a load – Achieving stable conditions 12 Making buildings better

Site Based Testing 14.0 13.5 13.0 12.5 13.5°C 12.0 10.5°C HIU 11.5 Here is a little quiz before we break ∆T = 3.0 ° C 11.0 10.5 for the Q and A session 10.0 Temperature (°C) 9.5 ∆T = 3.0 ° C 9.0 8.5 7.5°C 8.0 7.5 7.0 6.5 6.0 5.5 5.0 10:25 10:30 10:35 10:40 10:45 10:50 10:55 11:00 Time Primary inlet Primary outlet Secondary inlet Secondary outlet 13 Making buildings better

The Future • Where does the industry stand on HIU testing in the future? • Are there any additional requirements for HIU testing? • Is there a need for an industry agreed Standard? 14 Making buildings better

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