# Order a unique copy of this paper HVAC environmental controlProblem #1 Consider the design of a religious building with the following specifications; • Data: – Long Island; New York NY (Lat. 40º) – Indoor design conditions 72⁰F/50% RH. – Dimensions: 120 ft x 80 ft x 10 ft orientation due south (see schematic). – Open floor plan with internal rooms. – Windows in south east and west with windows to wall ratio of 0.5 in the south and 0.25 in east and west respectively. – Double glazing low  window – Service schedule • M-F/6am-8am & 7-9pm • Sundays 8am – 5pm – Illumination and equipment heat density =15 W/m2 – Brick walls 4.0 inches with 2 inches of insulation (Type C4/B5) – Roof type 1 (Steel Sheet w/2 inches) color light with suspended ceiling. – Two standards wood doors in N/E each: 0.350 Btu/( h-ft2 -°F) – # of occupants M-F/ 6am-8am = 0.01 per square foot All other times = 0.02 per square foot Foundation :  Slab-on-grade with 8-inches foundation walls and vertical board insulation on outside foundation wall. R value of insulation – 5.4 ( h-ft2 -°F)/Btu Determine the following: 1. Using HCB code show that the total peak load of the building and the Sensible Heat Factor for the Room are approximately 28RT and 0.20 respectively. Show evidence of your load calculations. . 2. Verify that the infiltration rate of 1.0 ACH is sufficient to maintain indoor air quality; if not sufficient make proper corrections in your design. 3. Specify the HVAC unit in terms of: total supply air (in CFM); fresh air requirements (in CFM); SHF for the cooling coil; type of condensing or humidifying unit; cooling and reheating capacity (in RT); and condensation rate (in lbm/hr). Draw a detail schematic of this AHU and sketch all processes in the psychrometric chart. 4. Assuming uniform load distribution; sketch the air distribution system for this building (i.e. duct layout); provide sizing for all ducts (in inches) and size the fan by determining total pressure drop (inWG). Use round ducts and outlets and assume maximum throw of 10 feet per outlet. 5. Recommend an HVAC unit with reasonable commercial COP and estimate the annual energy consumption of this HVAC system in kWh/yr and in \$/yr assuming average commercial rate of \$0.15/kWh. Make any necessary reasonable assumptions for daily and annual cycles. 6. Estimate the air leakage rate out of the building in CFM due to cracks and doors and indicate how it will impact the flow management in the AHU. 7. Indicate -in a few lines- how you would refine your analysis and design if given the time and resources.

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