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

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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

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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?

Introduction

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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

Laboratory Testing

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• Primary circuit

– Volume flow rate – Inlet temperature – Outlet temperature

• Secondary circuit

– Volume flow rate – Inlet temperature – Outlet temperature

Thermal Performance Test

HIU

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• 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%

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”

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• Consist of:

– Two endplates – A set of internal plates – Primary inlet and outlet – Secondary inlet and outlet

Plate Heat Exchanger

Thermal envelope

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• HIUs can consist of:

– Multiple plate heat exchangers – Pipework – Integral pump – Expansion vessels – Two port control valves – Flow regulating valves – Thermostatic valves – Heat meters

Heat Interface Units

Thermal envelope

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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

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• Single plate heat exchanger

– Space cooling only – Space heating only

• Single plate heat exchanger

– Two-port control valve

• Hot water cylinder
• Space heating

HIU Configurations

• Twin plate heat exchanger

– Common primary – Two-port control valve – Space heating – Domestic hot water

• Cylinder
• Instantaneous

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HIU Configurations

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• LTHW and CHW in one skid

– 20+ floors – One HIU on each floor

3 m

Plantroom HIUs

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• Same principal as lab based testing
• Challenges

– Accessibility – Installing sensors – Achieving a load – Achieving stable conditions

Site Based Testing

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HIU

5.0 5.5 6.0 6.5 7.0 7.5 8.0 8.5 9.0 9.5 10.0 10.5 11.0 11.5 12.0 12.5 13.0 13.5 14.0 10:25 10:30 10:35 10:40 10:45 10:50 10:55 11:00 Temperature (°C) Time Primary inlet Primary outlet Secondary inlet Secondary outlet

13.5°C 10.5°C 7.5°C ∆T = 3.0°C ∆T = 3.0°C

Here is a little quiz before we break for the Q and A session Site Based Testing

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• 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?

The Future

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