In a chiller plant , 4 CHW pumps are connected to common headers in Parallel. Each pump has DP of 5 bar (return 2 bar and supply 7 bar, flow 70 l/s, supply return pipe diameter 200mm). Common header flow when all pumps are in duty, flow is 280 l/s and pipe diameter is 400mm. How to calculate DP...
In 10 floor building, a common exhaust duct riser serve each floor pantry. At 10th floor, main riser flow 400 l/s (350 x 250mm) and brach to 10th floor has flow of 40 l/s (150 x 100 mm). When putting this values in ashrae duct fitting (take-off), i am getting more than -50 pascal at brach and...
Hi Team,
I need one confirmation. Does AHRI certification is applicable for Air cooled chiller less than or equal to 200 TR capacity only? (Note: Unit rated frequency is 50 Hz ).
A completed hospital project. Got a complaint for higher noise level of around 52 dB in staircase , where as acceptable is 45 dB. Cool air supplied through FCU unit. After adjusting flow/vcd, clean filter and all, we didnt got much success. We further analyzed the drawings and found that the FCU...
There are two machine A & B which are running simultaneously. Both machine can provide 24V output when running. By using output of these machines I want to operate 3rd Machine C, provided following condition -
if both or Any of the machine A & B is running, machine C should operate
if both...
Hi,
I want to ensure whether the actuator installed at the VAV boxes has the correct Torque. The VAV box is quite old and not started since, last 2 years and manufacturer also not responding.
Static Pressure is 600 Pa, Flow - 1100 L/s, VAV neck radius - 120mm, Multiple blade.
Hi,
In Distribution board, I seen kA (SC) rating of 415V 3P 32A MCB as 25kA which is more than designed for the panel (as compare to panel SLD 10kA)
What could be the consequences for selecting higher kA MCB?
Hi Team,
I want to calculate temperature of fluid (Cooled water) at the outlet of pipe (carbon steel)?
I have data as below -
Flow - 3 m3/hr
Pipe nominal Dia - 20mm
Length - 20 meters
25mm thick fiberglass insulation
Water inlet temperature - 4°C
Room temperature - 30°C
Hi folks,
We have big condenser units serving to Multi zone air handling units 8000 CFM. I need to incorporate ON/OFF of the condenser unit. What will be the correct way to do so? Condenser units has inbuilt control panel which may take input from other sources for the On/off operation.
Please...
Stupid question..!! Please excuse me :) I am not electrical background but would like to know some details..
Does star-delta connection is provided at Panel or at motor?
I have seen Star-Delta simple line diagram on the surface of (3-phase 9 kW Induction Motor) wiring connection plate. So, does...
Hi,
I have seen over the internet that while converting kW to IP units, it appears like Btuh, while converting kWh to IP units, it appears Btu.
Why HOUR factor is considered while concerting kW to Btuh and why not when converting kWh to Btu.
Does remote start/stop of equipment is possible through volt free (Dry) contacts provided in equipments' control panel? I want to start/stop the pump through BMS. Manufacturer states that he has provided Volt free contacts for start/stop in pump's control panel.
Had a heated argument so just want to have clear understanding on this thing. When we are calculating pressure head for chilled water pump, we include all fittings and losses occur through the farthest route of CHW piping with corresponding flow including the return lines. My understanding is...
We usually measure SA temperature using digital thermometer's wire probe in line with the flow. I have been informed to take temperature of supply air grill surface using IR thermometer, instead of air flow . I believe, there will be difference in temperature when reading taken on SA grill...
I have data for one of the coating material, expressing VOC content in g/g. I wanted to convert this unit into g/L. I have density information for this paint as well in g/cm3.
Can someone guide me about this conversion?
VOC in g/L = (X g/g)*( Y g/cm3)
= (X g/g)*( Y g/0.001L)
= XY * 1000 * g/L...
An ice machine with efficiency mentioned as 11.4 – 0.0190H kWh/100 lb ice. What does 11.4 – 0.0190H stands for?
Can we simplified this efficiency into simpler form such as kWh/lb of ice?
An ice machine with efficiency mentioned as 11.4 – 0.0190H kWh/100 lb ice. What does 11.4 – 0.0190H stands for?
Can we simplified this efficiency into simpler form such as kWh/lb of ice?
Effectiveness of heat exchanger can be calculated as (Tin - Tout)/Max Differential Temperature. I have Energy wheel to extract heat from outside air. OAT=46°C, after energy recovery it drop down to 30°C. Exhaust air Temperature EAT=24°C. so, Effectivess = (46-30)/(46-23), it gives 70%...
