Knowledge points of HVAC cold and heat source design
1.The design position of the pump in the system:
2.
Generally speaking, the chilled water pump should be located at the front end of the chiller, and the chilled water coming back from the end is pumped back to the chiller through the chilled water pump; the cooling water pump is located on the water path of the cooling water entering the unit, and the cooling water from the cooling tower is pumped by the cooling water pump. Return to the unit; the hot water circulating pump is located on the return water main pipe, and the hot water returned from the end is returned to the plate heat exchanger through the hot water circulating pump.
2. Valve design on the cooling tower:
1. Add a solenoid valve to the cooling tower inlet pipe (manual valve is not recommended);
3.The drain valve should be installed indoors (if it is placed outdoors, because there is some water in the pipe, it is easy to freeze in winter)
3. The installation position of the electronic water treatment instrument:
is placed behind the pump and in front of the host.
Four. Before and after the filter:
Put pressure gauges before and after the filter.
5. Valves before and after the pump:
1. The water pump inlet pipe is connected in sequence: butterfly valve-pressure gauge-soft connection.
2. The outlet pipe of the water pump is connected in sequence: soft connection-pressure gauge-check valve-butterfly valve.
6、Sub/water catcher:
A thermometer should be installed on the return pipe of the water collector.
Seven, the location of various instruments:
Temperature gauges, pressure gauges and other measuring instruments should be arranged in a place that is convenient for observation. The valve height is generally 1.2 m to 1.5 m above the ground. Above this height, a working platform should be set.
8. The location of the unit:
The distance between the protruding parts of the two compressors is less than 1.0 m, the distance between the refrigerator and the wall and the distance between the non-main passages is not less than 0.8 m, and the distance between large and medium-sized refrigeration units (centrifugal, screw, absorption chiller) is 1.5 m ~ 2.0 m. The upper part of the refrigeration machine room of the refrigeration unit is reserved for lifting hooks or electric lifting equipment for large parts.
