Heating system from Problem 1 Flue Gas Water tower T200 oc S

Heating system from Problem 1:

Flue Gas Water tower T-200 oc Steam Air Cooled Condenser 10.75m Water Water Building Boiler Return w ater tan Figure 1.1 A Simple Boiler Steam Heating System B: Steam 103.35 kPa T-150°C C: w ater V a Vua V ,a 2 m Main pipe flow velocity: v -0.314 (m/s) cross-section area: a F 63.6x10 4 (m Figure 1.2 Boiler and Water Inlet Pipes Water Properties Density 1000 kg/m3 Specific Heat cwater 4.19 kJ/kg/oC Steam Property Specific Heat cateam 2.01 kJ/kg/oC Latent Heat from Steam to Water L 2257 /kg/oc Steam In T-140 oc Steam out T-120 OC Figure 1.3 Room Radiator Motored fan Steam in T-115 C Mass flow rate Water Out 2 kg/s T-20 °C Figure 1.4 Air Cooled Condenser

Solution

(1) WATER FLOW RATE OF THE MAIN PIPE: Given is the flow velocity and the cross-section area a, so the flow rate can be calculated using formula v x a = 0.314 x 63.6 x 10^-4 = 0.20 x 10^-2 m3/s. A flow meter can be used to measure this volumetric flow rate. (ANSWER)

BOILER STEAM PRESSURE & TEMPERATURE: Using pressure and temperature sensors.

FLAME TEMPERATURE IN THE FURNACE CHAMBER: Using temperature sensor to measure temperature of flue gas, the furnace temperature can be obtained.

TEMPERATURE OF BUILDING ROOMs BUILDING: Temperature sensor located at the optimum point in the room.

(2) Factors to be considered: Safety of human operator, location of sensor, accuracy of the equipment/device/sensor, ruggedness, durability, reliability, sensitivity, etc.