On the flow switch in the water loop ground source heat pump system – ground source heat pump, flow switch – heat pump industry
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Abstract: Introduce water ring / Ground Source Heat Pump Unit of water flow to ensure the method, flapper / differential pressure flow switch in the water loop / ground source heat pump water system.
Keywords: Water loop heat pump system, pressure-type flow switch, precise flow control
1, Overview Water loop and ground source heat pump is the fastest growing type of air-conditioning, which in application flexibility and energy efficient features widely used in office buildings, shopping malls, luxury housing and other occasions. The water loop heat pump units can be combined Cooling tower And low heat to form a large-scale water loop heat pump system, such as little water loop heat pump systems are generally hundreds, as many thousands of units of water loop heat pump units, such a large system, the hydraulic balance of the water system was very strict Otherwise, there will be some water loop heat pump can not get his required water flow, which may lead to run-time summer Refrigeration Condensation pressure systems often set too high and start and stop frequently, resulting in compressor failure, winter running, as water flow is too small Heat exchanger Excessive heat absorption may lead to heat exchanger freeze, causing tube heat exchanger "Explosion."
2, Flow Switch Selection Heat exchanger in order to ensure proper water flow in addition to conscientiously to optimize the design of the water pipeline and water balance, it must also
With water to ensure water flow switch stops the compressor after a decline, this is a very important protection device, if each unit is not installed flow switch could lead to heat exchanger "Explosion" and compressor failure . As the water loop heat pump water system to be huge, running out of energy and system stability considerations, the various components of the water requirements in its water resistance is smaller, so water flow switch is not too much resistance, the most commonly used types of flow switch pressure-type, target type and small baffle flow switches, etc., let the water flow switches for introducing the advantages and disadvantages.
2.1 Differential Pressure Flow Switches to install and use
Pressure-type flow switch is based on HVAC equipment, resistance and flow curves of the design. We know that the heat exchanger HVAC equipment, have their resistance and flow performance curve, by detecting the differential pressure across the access to water, and with the device pre-set values are compared, it can accurately control flow.
Differential pressure type flow switches, compared with the target type is a precise flow control, it has a precise flow control value. It is directly installed in the unit and avoid the user install incorrect situation. If the installation of the unit from the pressure switch connected to two copper heat exchanger import, export, import and export of measured pressure, which reflects the flow. The site does not require users to install and the wiring, thus avoiding the target-type flow switch installation is not exactly a hidden danger lead to unit failure.
Differential Pressure Flow Switches with accurate flow control, no additional drag on the system, but also on the pipe diameter does not require, and no flow disturbance and interference can be replaced by any form of Target Flow Switch for HVAC water systems flow control as opposed to Target Flow Switch it avoids pump cavitation due to false traffic (actual flow rate of large, but the water mixed with air, the actual flow rate is not significant), which can be widely used in the use of brazed plate heat exchanger device, water pipe heat exchanger loop / ground source heat pump water flow control and both parts of frost protection.
Ring for water / ground source heat pump uses brazed plate heat exchangers or tube heat exchanger the pressure and flow curves may be different, but fixed at the factory test pressure switch set point to ensure that the pressure switch configured to protect the value of the right traffic. Disconnect the flow is greater than the rated flow of the proposed 50% reduction proposed flow is less than 80% of the rated flow.
Through the factory configured with the appropriate action and reset the value of the differential pressure type flow switches can serve as a check Chiller Group, the water system is installed properly is an important basis.
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