Mechanical Services

The plans, elevations and section for a proposed fitness centre development are available on vUWS. They include six A3 sheets numbered DA-101; DA-102; DA-103; DA201; DA-202 and DA-301. The project is located in Rockhampton, on the central coast Queensland. For this design, Rockhampton is Latitude 23 0 22.5’ South, with 11.3m elevation above sea level. Design the air conditioning and/or mechanical ventilation fans (each to the applicable areas) to the café, reception, ground and first floor gymnasiums and toilet/change-room areas. The air conditioned area will generally be occupied between 7:00am and 11:00pm, seven days per week. All air handling equipment will be off-the-shelf units, located externally and to your recommended location. It will be necessary provide detail(s) of your selection of units and fans. Design Parameters The air conditioning system is to provide performance-based comfort conditions within the air conditioned spaces only. Design parameters which form the basis for design include: INDOOR OUTDOOR CONTROL TOLERANCE Summer: 24.00C DB / 50% RH 36.0 0C DB / 26.5 0C WB +/- 1 0C Winter: 21.00C DB 11.0 0C DB +/- 1 0C Inherent system characteristics must be chosen to limit internal RH to not more than about 50% under most ambient conditions. Assume non-conditioned internal space summer temperature will peak at 33.50C DB on the hottest day. The following information is to be used in the air conditioning cooling load calculations for the various spaces: Occupancy: Assume gymnasium space @ 1 person / 18.0m2 and café @ 1 person / 8.5m 2 Lighting: 20 watts/m 2 Equipment: 12 watts/m 2 Building structure: Refer drawings Glazing: Single glazed, using Viridianglass VLamTM Grey 6.38mm (see vUWS Viridian file, p124, for details) to the operable walls and external door assembly in recreation room and retail space. Outdoor air quantity: To AS 1668.2 Café and toilet/change room (exhaust): To AS 1668.2 and NCC (BCA) Page 2 of 4 Assessment criteria Note: We are interested in summer conditions only so design for cooling equipment and disregard heating. 1. Heat load calculations [40% of assignment 3] Carry out air conditioning load estimates using the Carrier method down to total grand heat. Calculate exhaust air quantities, and include: (a) all calculations for U-values, or nominate sources (b) calculations for peak solar gains through glass (c) equivalent temperature difference calculations for walls and roof (d) peak zone loads (e) basis for outside air quantities and comparison with exhaust (f) any other information necessary for design calculations All the above items will be necessary in order to successfully complete the Carrier sheets [40% overall] 2. Psychrometrics and Equipment Selection [20% of assignment 3] Plot the psychrometrics and check results. Select the air conditioning equipment from a reputable manufacturer’s catalogue (photocopy relevant pages), paying particular attention to entering and leaving temperatures on cooling coil, condenser air entering temperature, fan pressure and air quantity available. a). Plot on psychrometric chart of summer conditioning cycle [10% overall] b). Equipment selection [10% overall] 3. Ductwork Design [40% of assignment 3] Design the appropriate supply air and exhaust ductwork to the gymnasium on the ground floor and the disabled toilet on the ground floor. On a plan, indicate layouts and ductwork sizes, being sure to determine supply air quantities in a representative sample. a). Ductwork single-line logistics, ground floor · Gymnasium [20% overall] · Disabled toilet [10% overall] c). Diagramatic representation of ductulator calculations [10% overall].


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