Recent content by Timothi

Experts, I request your valuable comments on the case below, Two numbers of 80 TR (W,S) chillers are installed for a commercial building of 100 TR cooling demand. Chillers are designed considering 20% diversity factor. There is a constant flow primary pump set with water flow rate 200 GPM...

Anyways, thanks for all your replies (regardless of the content). Finally I got it done. Sharing knowledge is the best way to learn

Yes... If the minimum flow is 20% and ur building load is <20% your VPF system will be running in 20% load. Sharing knowledge is the best way to learn

Dear Experts, I have the following data for heat load calc using excel sheet. Outside DB = 38 Deg C Outside WB = 30.8 Deg C Outside RH = 60% Inside Room conditions = 23.5 Deg C, 55% RH Room Total sensible heat = 10000 BTU/HR Room Total latent heat = 1800 BTU/HR There is no mixing of return...

Experts, Can someone list out the steps to find pressure relief valve set value in a closed loop chilled water system? Thanks in Advance Sharing knowledge is the best way to learn

Heat energy required for temp rise = Total room volume x density of air x specific heat capacity of air x(final temp - initial temp) time required for temp rise = Heat energy/Heat load Sharing knowledge is the best way to learn

For a closed loop system, only frictional loss due to pipe run, valves & fittings is applicable. You can follow "equivalent length method" to calculate total frictional loss in your closed loop system. Sharing knowledge is the best way to learn

Experts, In a variable primary flow chilled water system (air cooled), total frictional loss is 6.5 bar as per calculation. Is this same as chilled water system working pressure, or different? Thanks in advance Sharing knowledge is the best way to learn

Thank you very much

I meant constant primary-variable secondary chilled water system

Hi HerrKaLeun, Thank you very much for the reply. Pl correct me if I'm wrong. When the load in the AHU is less, the return water temp is also less than designed CHWR temperature which is sensed by the temp sensor located in the AHU return pipe. What does this sensor do? Send signal to BAS or...

(l/s-person x total no. person)+) (l/s-m2)* total area in m2

How does the PICV adjust the flow when AHU load is less?

Hi experts, HVAC related books say, in a primary-secondary chilled water system, the flow is controlled by the 2-way valve in the coil return side and the pressure in the supply pipe shoots up which is sensed by the dpt and dpt signals the secondary pump vfd to reduce pump speed. If this is...

For a closed loop system only friction loss is applicable. no static head because the pressure drop during lift is regained during down flow. No velocity head since there is no remarkable change in velocity.