ASHRAE Standards 15 and 34 for VRV VRF Systems

Ashrae Standards 15 And 34 For Vrv Vrf Systems-PDF Download

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ASHRAE Standards 15 and 34 , Considerations for VRV VRF Systems. Executive Summary, The Variable Refrigerant Volume VRV technology was introduced by Daikin in the early 80 s. as an alternative method of cooling and heating in commercial buildings Today over 25 million. individual spaces are being served by this technology VRV is a very energy efficient and. flexible equivalent to a chiller system while it also offers superior comfort compared to. traditional air handler terminal units , The ASHRAE Standard 15 is significant to HVAC manufacturers engineers and contractors. because it specifies compliant design construction installation and operation of refrigeration. systems The standard was originally recognized in October 1930 Over time the scope of the. standard has been expanded but the features and technology of a VRV system have not been. specifically addressed ,This document demonstrates that . VRV Systems can be properly selected and designed adhering to ASHRAE Safety. Standard 15 and Standard 34 , Since Standard 15 is an application based standard not an equipment design guide .
engineering judgment can be required when applying the standard . It is recommended to use the step by step approach described in this document in. order to ensure that the design of a system follows Standards 15 and 34 . Published by the Daikin Product Marketing Department. Daikin s products are subject to continuous improvements Daikin reserves the right to modify product design specification and information in this document. without notice and without incurring any obligation . Page 2 of 17, Introduction,VRV Technology, In the early 1980s the Variable Refrigerant Volume VRV technology was introduced by. Daikin as an alternative method of cooling and heating in commercial buildings Although VRV. has been commercially available globally for over 30 years it remains a relatively new concept. to the North American market , VRV is an applied heating and cooling system that distributes refrigerant rather than water to. multiple fan coil units serving the conditioned spaces The natural attributes of a VRV system. position it as a modular and scalable energy saving equivalent to a chiller system while. offering superior comfort when compared to traditional air handler terminal units The compact . lightweight structure within the VRV modular concept ensures ease of installation in small or. large buildings ,ASHRAE Standard 15, The ASHRAE Standard 15 2010 provides safeguards for life limb health property and. prescribes safety requirements , The standard is recognized by equipment manufacturers This standard specifies safe. design construction installation , engineers and contractors as the main guide for personal safety and operation of refrigeration.
involving refrigeration systems It strives to ensure a safe systems . application of refrigerant systems by limiting the maximum charge This standard applies. so that a complete discharge due to a leak into a small occupied a to the design construction test . installation operation and, and enclosed room can never exceed the allowable limit . inspection of mechanical and, As with most standards ASHRAE Standard 15 is an application absorption refrigeration systems . based standard not an equipment design guide so substantial including heat pump systems used. engineering judgment can be required when designing a system in stationary applications . ASHRAE Standards are part of the National Voluntary Reprinted with permission . Consensus Standard In order for a standard to become ASHRAE www ashrae org. 2010 ANSI ASHRAE Standard 15, mandatory it must first become model building code by an. adoption process into the International Mechanical Code IMC Thereafter the model code. becomes mandatory when it is adopted at the state or local jurisdiction level Since the. conversion from ASHRAE Standard to state local code can take time and parts of the original. standard often changes it is recommended to review the local code as well when designing a. Standard 15, STATE Code, Published by the Daikin Product Marketing Department. Daikin s products are subject to continuous improvements Daikin reserves the right to modify product design specification and information in this document. without notice and without incurring any obligation . Page 3 of 17, ASHRAE Standard 15 equivalent standards exist in Europe and Asia Systems utilizing the.
Variable Refrigerant Volume technology are common in these regions and are applied. successfully to meet these standards , ASHRAE Standards 15 and 34 applied on the VRV technology. The ASHRAE Standard 15 was written 1919 Initially it was a Tentative Code and it was. recognized as Standard B9 in October 1930 , This standard provides an. Originally the Standard was developed for safety following a unambiguous system for. catastrophic release of the content in a pressure vessel via a numbering refrigerants and. safety valve in a short time Over time the scope for the assigning composition designating. Standard has been expanded to cover most refrigerants and prefixes for refrigerants Safety. systems and 1978 it was issued by ASHRAE as Standard 15 classifications based on toxicity. and flammability data are included, The current version of the Standard does not address the safety along with refrigerant. of any particular refrigerant Instead it refers to ASHRAE concentration limits for the. Standard 34 2010 which identifies safety classifications and refrigerants . Refrigerant Concentration Limit RCL for refrigerants Reprinted with permission . ASHRAE www ashrae org, 2010 ANSI ASHRAE Standard 34. Front cover of ASHRAE Standard 15 2010, is reprinted with permission .
ASHRAE www ashrae org Front cover of ASHRAE Standard 34 2010. 2010 ANSI ASHRAE Standard 15 is reprinted with permission . ASHRAE www ashrae org , 2010 ANSI ASHRAE Standard 34 . Published by the Daikin Product Marketing Department. Daikin s products are subject to continuous improvements Daikin reserves the right to modify product design specification and information in this document. without notice and without incurring any obligation . Page 4 of 17, Daikin VRV systems use refrigerant 410A with minimal potential safety risks compared to most. other DX type HVAC systems The safety classification of R410A refrigerant concentration limit. in Standard 34 is group 1 meaning non toxic and non flammable RCL the refrigerant. it has no ozone depletion potential and it meets the stringent concentration limit in air . mandates of both the Montreal Protocol and the U S determined in accordance with this. Environmental Protection Agency However due to the ability to standard and intended to reduce. the risks of acute toxicity , displace oxygen Addendum L to ASHRAE Standard 34 2010 asphyxiation and flammability. has established the maximum RCL to 26 lbs 1000 ft3 of room hazards in normally occupied . volume for occupied spaces enclosed spaces , For Institutional Occupancies the limit is reduced to 50 13 Reprinted with permission . ASHRAE www ashrae org,lbs 1000 ft3 , 2010 ANSI ASHRAE Standard 34.
For smaller systems with less than 6 6 lbs of total refrigerant charge the 26 lbs 1000 ft limit. described above does not apply regardless of refrigerant safety Listed equipment containing not. classification if the system is installed according to the listing and more than 6 6 lb 3 kg of. manufacturer s instructions refrigerant regardless of its. refrigerant safety classification is, exempt from Section 7 2 provided. Since the indoor unit fan coils are in direct contact with the air the equipment is installed in. being distributed a VRV system is classified as a Direct System accordance with the listing and. according to Standard 15 with the manufacturer s, By definition a Direct System is also classified as a High installation instructions . Probability system meaning that a leak of refrigerant can Reprinted with permission . ASHRAE www ashrae org, potentially enter into occupied space 2010 ANSI ASHRAE Standard 15. The information in this document is intended to provide guidance A high probability system is any. system in which the basic design , to specifying and designing a VRV system while applying or the location of components is. ASHRAE safety Standard 15 However since many of the such that a leakage of refrigerant. attributes of a modern cooling heating technology such as VRV from a failed connection seal or. are not specifically addressed in Standard 15 there might be component will enter the occupied. variations in how the authority having jurisdiction AHJ space . Reprinted with permission , interprets compliance requirements to Standard 15 between ASHRAE www ashrae org.
jurisdictions 2010 ANSI ASHRAE Standard 15, Therefore it is good practice to review the local code and work. with the local AHJ when designing a system The terms authority having. jurisdiction AHJ and, jurisdictional authority used. herein refer to the organization or, individual responsible for. enforcing the requirements of this, standard , Reprinted with permission . ASHRAE www ashrae org, 2010 ANSI ASHRAE Standard 15.
Published by the Daikin Product Marketing Department. Daikin s products are subject to continuous improvements Daikin reserves the right to modify product design specification and information in this document. without notice and without incurring any obligation . Page 5 of 17, Applying Standard 15 when designing a VRV system. If refrigerant system piping components and units are located in occupied spaces the spaces. must be evaluated regarding safety for the occupants Occupied. occupied space that portion of, space is not necessarily just one room or an area but can also be the premises accessible to or. several rooms areas that are connected by corridors ductwork occupied by people excluding. or other means machinery rooms , Reprinted with permission . It is recommended to apply the Standard 15 requirements on the ASHRAE www ashrae org. 2010 ANSI ASHRAE Standard 15, design of a VRV system in 4 basic steps as listed below The. checklist at the end of this document can be used to facilitate the steps . First Step, Preliminary layout of the system, Second Step.
Determine the amount of refrigerant, Third Step, Verify that the VRV system layout complies. with Standard 15 requirements, Fourth Step, Actions if a room is too small. First Step, Preliminary layout of the system, The first step in applying Standard 15 in the design process of the VRV system is to develop a. preliminary layout of the complete system piping indoor unit fan coil units and outdoor units . to meet the heating cooling requirements in the rooms zones of the project . Even though the VRV technology allows very long piping distances due to cost and refrigerant. charge limitations in ASHRAE Standard 15 the equipment layout should strive to minimize the. piping lengths where possible , Published by the Daikin Product Marketing Department. Daikin s products are subject to continuous improvements Daikin reserves the right to modify product design specification and information in this document. without notice and without incurring any obligation . Page 6 of 17, Second Step, Determine the amount of refrigerant.
The second step is to determine the total amount of refrigerant 410A for the system . This calculation can either be done manually according to guidelines in Daikin VRV Installation. Manual or by using Daikin VRV Xpress selection software In addition to quickly providing the. refrigerant charge the output from VRV Xpress also automatically generates piping and wiring. diagrams If piping or indoor unit fan coil locations need to be revised the VRV Xpress will. recalculate pipe sizes and refrigerant charge automatically . If a room has more than one VRV system serving it thus more than one refrigerant circuit. installed it is recommended to check with the AHJ regarding how to determine the Quantity of. Refrigerant per Occupied Space It is not necessarily the sum of the refrigerant charges in all. of the circuits in the room It might be allowed to use the quantity of refrigerant in the largest. circuit in the calculations , Third Step, Verify that the VRV system layout complies. with Standard 15 requirements, The third step is to verify that the initial layout of the VRV system complies with the Standard. 15 requirements by , Determine the occupancy classification for the room s . Determine room volume s , Verify that no room is too small. Review refrigerant piping requirements, The checklist at the end of this document can be used to facilitate the steps .
Determine the occupancy classification for the room s . The classifications are Institutional occupancy Public assembly occupancy Residential. occupancy Commercial occupancy Large mercantile occupancy Institutional occupancy is a. Industrial occupancy and Mixed occupancy premise or that portion of a. premise from which because they, For Institutional occupancies a premise where the occupants are disabled debilitated or. confined occupants cannot readily, cannot readily leave without assistance of others the maximum leave without the assistance of. refrigerant concentration limit RCL is reduced by 50 compared others Institutional occupanci. ASHRAE Standards 15 and 34 applied on the VRV technology The ASHRAE Standard 15 was written 1919 Initially it was a Tentative Code and it was recognized as Standard B9 in October 1930 Originally the Standard was developed for safety following a catastrophic release of the content in a pressure vessel via a safety valve in a short time Over

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