By Kevin Pennycook, D. Churcher, D. Bleicher
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Additional info for A Guide to HVAC Building Services Calculations
Step 3. 3 (right hand side of chart). This should then be added to the building height to give the final chimney height. Boiler A produces 5 MW Boiler B produces 14 MW Boiler C produces 9 MW A to B is 10 m B to C is 15 m C to A is 19w5 m Volume flow rate for A is 4w3 m³/s Volume flow rate for B is 12w1 m³/s Volume flow rate for C is 7w8 m³/s Procedure – multi-chimneys Step 1. Work out the final chimney height as previously shown. Step 2. 3). Step 3. Express the separation (distance) ‘s’ between each pair as a multiple of the free standing height of the smaller chimney determined in 2.
4 A – 0w24 B – 0w23 C – 0w18 Step 5. Increase in height (Hr × h) A – 1w056 m B – 1w702 m C – 1w08 m Step 6. Therefore use 1w702 m, as it is the largest increase Step 7. Final Heights: A – 11w8 + 1w702 = 13w5 m B – 13w2 + 1w702 = 14w9 m C – 12w5 + 1w702 = 14w2 m GUIDE TO HVAC BUILDING SERVICES CALCULATIONS © BSRIA BG 30/2007 37 Heating loads Cooling loads Water flow H10 FLUE SIZING Using the procedure for calculation of flue area: Step 1. 3, flue gas velocity is 4w5 m/s Step 2. Area Equivalent (A= qf ÷v) A – 0w956 m² B – 2w689 m² C – 1w733 m² Step 3.
As a system becomes more critical to business operation, it may be justifiable to provide additional redundancy. In particular, if a dual pump set is installed and one pump fails, then the second can be started by the control system to ensure continuous operation. The failed pump can then be replaced or repaired without interrupting the system. Example 1 Consider a situation where a building has a forced outdoor-air ventilation system with a heating coil and a radiator-based space heating system.
A Guide to HVAC Building Services Calculations by Kevin Pennycook, D. Churcher, D. Bleicher