Environmental Design Solutions Ltd UPDATE

7-10 Old Bailey office refurbishment

The building upgrade included replacement of all lighting systems, HVAC and internal and external glazing. Retention of the original structure preserved the thermal mass of the building.

The main architectural feature of the refurbishment was the introduction of a sloping atrium to bring daylight into the centre of the building.

This study was undertaken to provide as built Part L2 compliance documentation and EPC lodgement and was completed in 6 man/days.


Refurbishment upgrade summary

Glazing replacement units were Saint Gobain SKN 174 with high daylight and low solar transmission.%%IMAGE%%

Walls and roof constructions upgraded to meet current Building Regulation standards.

Lighting has automatic daylight linked dimming to all daylight lit areas as well as automatic presence detection in offices and WCs. Lighting efficiency is 2.49W/m2/100lux throughout.

HVAC replacement fancoil units with fresh air heat recovery.

Part L2 and EPC performance data

The design building emissions rate (BER) produced CO2 emissions levels 17% below the 2006 target emissions rate (TER) and 40% below the Notional emissions rate.%%IMAGE%%

An EPC score of 56 was achieved giving an asset rating of C.

NOTE: If the refurbishment had been undertaken using VAV ec motor fancoils the BER would have been 31% below the 2006 TER and would have complied with the expected 2010 compliance target, and the EPC would be 47 to give an asset rating of B.

ASHRAE 90.1 Studio

%%IMAGE%%ASHRAE 90.1 Studio a fully interactive tool for automatically generating and simulating baseline buildings and plant models.

Tas Building Designer is compliant with ASHRAE 90.1/140 standards and is used for Leed analysis of:

  • Energy performance
  • Thermal comfort
  • Renewables
  • Daylight and views
  • Green power
  • Ventilation effectiveness

The 90.1 Studio is an interactive tool which allows the Tas user to automatically create baseling buildings and systems based on basic design criteria gleaned from the actual design model. It allows back tracking for changes in actual design specification, which is automatically used to regenerate baseline models.

The studio will calculate design and baseline energy use and CO2 emissions in batch mode, taking advantage of multi-core processing.

Room loads, design air flow rates and plant component sizing are available

A comprehensive breakdown of energy use is provided for all aspects of building services equipment and LEED formatted reports are automatically generated.

Tas Academy at EDSL

Learn about the very latest procedures and capabilities offered by the UK’s most comprehensive building and plant simulation tool.

Tas is accredited for UK Part L and EPC and ASHRAE 90.1 (LEED) calculations.

Tas does not use any SBEM type calculation procedures and so delivers design and compliance in one tool.

The day will give you a clearer understanding of the fundamentals of building simulation and how it serves as an essential tool in meeting the demanding challenges of sustainable building design.

Topics include:

  • CAD import
  • future climate data
  • simulation procedures in design
  • load calculations
  • natural ventilation/mixed mode
  • daylight simulation
  • renewables
  • Plant and controls simulation
  • Part L2/EPC 2010
  • ASHRAE 90.1 (LEED)

The day is free to all attendees and is conveniently hosted at EDSL’s Milton Keynes offices.

Places on an Academy day may be reserved on www.edsl.net/academy, or for more detail email academy@edsl.net or call 01908 261461.

Passivent Airscoop Builder

Developed in cooperation with Passivent using real test data and experimental results obtained by an independent research institute, this tool allows Passivent Airscoops to be modelled accurately in Tas by using the measured performance data for each model of Airscoop.

It is not only accurate, but also provides a quick way of assessing many Airscoop options. It automatically provides Tas building simulator with geometry, construction materials and performance data for the selected Airscoop model.%%IMAGE%%

Fully integrated into the Tas natural ventilation analysis Airscoops may be analysised with or without additional ventilation paths, such as openable windows. A range of ventilation control options are available including CO2 control.

The results of the simulation may be used to show compliance with avoidance of overheating criteria such as BB101 for schools.

Zero Carbon and Low Carbon Housing Design

EDSL Tas and NHER SAP combined technologies offer a unique solution to zero and low carbon housing design.

%%IMAGE%%In conjunction with design-lead multidisciplinary consultancy HTA the power of Tas building simulation is brought to bare on the challenge of low carbon housing design.

Rory Bergin, HTA’s head of sustainability and innovation says “the desire to design more sustainable buildings is more complex than it needs to be with a general failure of design tools to integrate with one another. As users of NHER SAP and Tas we look forward to the potential efficiency gains we expect from a seamless integration between these two market leading tools”.

NHER’s SAP software is now capable of importing Tas building geometry, construction details and energy performance data.

Innovative energy efficiency strategies, not capable of assessment directly with SAP may be evaluated in Tas and the performance results imported into Section Q of SAP.

EDSL Consultancy Services

%%IMAGE%%We undertake Tas building simulation based consultancy for clients on general design for room loads and plant sizing, energy performance, CO2 emission, daylight saving and natural ventilation.

EDSL staff are accredited Energy Assessors under the CIBSE Low carbon Consultants register and undertake Part L1/L2/EPC compliance calculations and lodgement. We are also able to offer ASHRAE 90.1 (LEED) compliant simulation services.

Tas is an accredited DSM (Dynamic simulation Model). It does not use any SBEM type calculations. Both building and plant are simulated on hourly time steps through a complete year of weather data. Plant components are able to use manufaturer’s partload performance data.

The result is a more detailed and accurate evaluation of the true efficiency of design intent.

No fudge factors or crude approximations, but good quality engineering analysis throughout and this reflects in the quality of the compliance.

Weatherite free cooling displacement units for retail stores now modelled in Tas

Weatherite units utilise outside air whenever possible to provide air at 19C to displacement terminals, mixing appropriate amounts of return and outside air to maintain the required supply temperature. Mechanical cooling is only used when necessary. Supplying air at 19C means that free cooling is available for extensive periods of time over the year.%%IMAGE%%

Main AHU fans run at 80% flow rate, except under extreme summer weather when the flow rate is boosted to 100%. This means that due the fan performance curve, fan energy use is reduced to 50% for the vast majority of the time.

The displacement process means that return air temperature is typically about 28C. Winter preheat uses 100% return air at 50% volume flow rate.

Analysis for a typical retail store, with the addition of a fresh air heat recovery, showed 52%reduction on CO2 emissions compared with the notional building performance (2006 target 28% and expected 2010 target ~ 58%). An EPC asset rating of B is ahieved.

Compared with an equivalent CAV system with heat recovery the free cooling displacement units showed an 8.5% reduction in CO2 emissions.

Tas export links to daylight and artificial lighting tools

Efficient lighting design, management and control are a key part of building design in meeting stringent CO2 emission targets.

Effective daylight harvesting has become a primary architectural goal.

Tas has an inbuilt daylight factor calculation of simpler spaces. This daylight factor is used, with hourly sky lux data through the year, to predict hourly internal daylight lux levels.

%%IMAGE%%External lux levels are derived from hourly solar data in the simulation weather set.

The hourly data on daylight availability may be used with a range of lighting control functions to calculate daylight saving on artificial lighting loads.

For more complex spaces and geometries the Tas geometry data may be exported to more detailed daylight simulation software tools including:

  • SGI32

RAYFRONT which is a user friendly front end to RADIANCE.

The choice of daylight simulation tool is the desinger’s choice, but the tools listed above are able to cover the whole spectrum of capability.

Our commitment

The EDSL Tas promise to users of alternative, accredited, simulation software.

We can

  • Halve your software overheads
  • Double your productivity
  • Improve the quality of your analysis
  • Provide quality technical support
  • In addition, we will train two people for the price of one

Ask us to prove it to you

Environmental Design Solutions Ltd

13-14 Cofferidge Close, Stony Stratford

Milton Keynes MK11 1BY

Tel: +44 (0)1908 261461

Fax: +44 (0)1908 566553

Email: info@edsl.net

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