Get A Guide to HVAC Building Services Calculations PDF

By Kevin Pennycook, D. Churcher, D. Bleicher

ISBN-10: 0860226573

ISBN-13: 9780860226574

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For instance, to meet the heating load of 230 kW, a possible strategy would be to install two boilers, each at half the load for example 115 kW. This not only meets the load requirements but also provides some degree of safety should one of the boilers be out of use due to failure or routine maintenance. In cases where a preheat factor has not been applied, boilers are often selected to provide 60% of the total load, for example two boilers at 138 kW each. ) Assuming the boilers selected have a burner turn- down ratio of 50% (giving 50% output), this gives four combinations of plant capacities to deal with part load conditions: One boiler at 50%, one boiler off = 75 kW, One boiler at 100% full, one boiler off = 150 kW, One boiler at 100%, one boiler at 50% = 225 kW, Two boilers at 100% = 300 kW.

2. HWS provided by a separate central boiler or similar dedicated system. This option allows for easy variation between operating temperatures of a heating system (such as underfloor heating) and the HWS, and for variation in operating cycles (such as HWS required all year round, heating not required in summer). 3. The HWS load may be incorporated into the operation of the central boiler plant. The effect on the overall plant duty will depend on the timing and level of hot water demand. Careful design can avoid simultaneous peaks with a minimum effect on the capacity of the boilers – for example by increased storage capacity.

This will require details of the fuel to be burned along with velocities and friction losses within the flue. The selected flue area must provide the highest possible flue-gas velocity and the smallest cooling area. This must also take into consideration the available draught. Total resistance of the flue/chimney is compared to the available chimney draught. If the residual chimney draught is excessive then the flue areas can be recalculated using higher flue-gas velocities. Design information required • • • • • • • • • 36 Fuel type with details of calorific value and the percentage sulphur content.

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A Guide to HVAC Building Services Calculations by Kevin Pennycook, D. Churcher, D. Bleicher

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