www . refrigerationandaircon . co . za RACA Journal I June 2023 33
Project
“ Evapco is certainly proud of being parts and successful supplier of choice for this prestigious project for Pick ‘ n Pay , our Main Contractor MRE and Consulting Engineers AMC ,” says van der Merwe . Last year Evapco SA celebrated its 40 th anniversary of operations in South Africa . Evapco SA manufactures and supplies the full range of Evapco products under licence to Evapco Inc . USA .
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THE CONSULTING ENGINEER ’ S DESCRIPTION OF THE REFRIGERATION COMPONENT The facility is one of the largest , if not the largest , temperaturecontrolled distribution centre in South Africa . The overall site is 360 000m ², of which 150 000m ² is distribution area . Of that , 45 000m ² is the temperature-controlled distribution area and forms the portion of the development that AMC was involved in . For this project , AMC completed the design , tender and site supervision of the insulated structures as well as the HVAC to all ancillary buildings .
Provision is made for a future heat pump , utilising the discharge gas from the primary plant and compressing it to 70 ° C saturated conditions in order to generate hot water in the future , if required . The plant has been equipped with VSD on all major component motors to ensure that part load conditions are optimised and energy savings are being realised during part loads conditions .
Rainwater harvesting forms a key component of the overall system and facility design . This rainwater is treated to a high quality , to make it suitable for use in the evaporative condensers , as well as site potable consumption . This greatly reduces potable municipal water consumption and also provides a large back-up water source requiring municipal water as back-up / top-up only .
AMC Engineers AMC Engineers
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Design challenges : The professional team worked together in an incredibly efficient fashion and were all dedicated to the effective design and co-ordination of all aspects of the project . The use of BIM was effectively implemented to ensure good co-ordination and integration of all design aspects . This ensured that site clashes and problems were timeously identified and addressed and mostly resolved before the installation took place on site .
The client required an efficient , robust and sustainable design solution that speaks to Pick ‘ n Pay ' s journey of sustainability while also providing a world class facility for their centralised distribution operations .
The facility is divided into two massive chambers . The air distribution in these chambers was critical and formed part of a detailed design investigation . Heat loads were sub-divided into design compartments for various areas such as the docking bays and then central corridors . This informed the placement of the coils and air changes per hour in the various sub sections and regions of the large open areas .
AMC Engineers
1 . The MT screw compressors each providing 1500kWR of cooling at 50Hz and a COP of 4.75 with 400kW motors .
2 . The plant room showing the HT reciprocating compressors and the HT suction accumulator .
3 . Rear view of the MT glycol pump sets .
www . refrigerationandaircon . co . za RACA Journal I June 2023 33