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DESIGN SPECIFICATIONFOR THE APPLICATION OFDX AIR CONDITIONING &HEAT PUMP EQUIPMENT RAC80 | 3rd Edition | 2017 www.theBESA.com

2 The Building Engineering Services Association Design Specification for the application of DX Air Conditioning & Heat Pump Equipment

Design Specification for the applicationof DX Air Conditioning & Heat Pump EquipmentAcknowledgementsThe BESA records its appreciation and thanks to the persons and organisations whohave freely contributed to this work. This includes the RACHP Executive Committeeand Graeme Fox of the BESA who contributed their time, experience and knowledge;to Steve Airey for his work in producing detailed drawings and images used throughoutthe publication; and in particular in memory of Tony MacWhirter who provided a largeamount of material and much individual effort in drafting earlier versions of this designguide. Many thanks also to the industry bodies ACRIB, BRA, CIBSE, BSRIA and ECA whoparticipated in the consultation phases.Tables 11.4 and 11.5 are reproduced by kind permission of the Chartered Institution ofBuilding Services Engineers. ISBN 978-0-9957600-0-4 3 New Edition 2017: ©2017 BESAThe Building Engineering Services Association Design Specification for the application of DX Air Conditioning & Heat Pump Equipment

Building Engineering Services Association Lincoln House 137-143 Hammersmith Road London W14 0QL Tel: 020 7313 4900 e-mail: [email protected] website: www.theBESA.com4 The Building Engineering Services Association Design Specification for the application of DX Air Conditioning & Heat Pump Equipment

FOREWORDThis third edition of RAC80 is published against a background of significantchange within the building services sector. Of particular note are the revisions ofbuilding Regulations and the Fluorinated greenhouse gas emissions regulation (FGas Regulation). Also the Energy Performance of Buildings Directive which seeksto regulate energy consumption.Much effort has been made and indeed continues to be made to raise levels ofcompetence, productivity and performance in the refrigeration, air conditioningand heat pump sector. To support this, BESA has undertaken to provide a numberof measures designed to demonstrate and achieve positive differentiation of theirmembers. One such measure has been the comprehensive revision of the secondedition of RAC80. This document has changed to a Design Specification for theapplication of DX packaged air conditioning & heat pump systems. It is hoped thatbuilding services system designers will benefit from the information containedwithin these pages. During the review and drafting process considerableconsultation was undertaken across the industry to ensure that this document fullyreflects industry specification and best practice.I believe this Specification will serve as a recognised benchmark for the airconditioning sector and for BESA members in particular. I would like to thankall those who have contributed to its production and specifically the RACHPSpecialist Group Committee and Graeme Fox at BESA for their efforts, knowledgeand experience.Andy BrewerChairman of the BESA Refrigeration,Air Conditioning & Heat Pump GroupThe Building Engineering Services Association Design Specification for the application of DX Air Conditioning & Heat Pump Equipment 5

6 The Building Engineering Services Association Design Specification for the application of DX Air Conditioning & Heat Pump Equipment

Contents Acknowledgements 3 FOREWORD 5 Contents 7 Introduction 8 SECTION 1 9 Design Criteria for Human Comfort SECTION 2 12 Determining Equipment Capacity SECTION 3 47 Types of system SECTION 4 53 System Evaluation and Selection Criteria SECTION 5 72 Design and Sizing Criteria for Pipework SECTION 6 82 Support Systems and Containment Design SECTION 7 91 Electrical Wiring Design and Sizing SECTION 8 95 Design Criteria for Air Distribution SECTION 9 103 Commissioning and Performance Evaluation SECTION 10 109 Glossary of Terms Used In This Document SECTION 11 117 Useful Tables Section 12 122 Bibliography and Sources 12.1 List of Figures 123 12.2 List of Tables 124The Building Engineering Services Association Design Specification for the application of DX Air Conditioning & Heat Pump Equipment 7