Discussion On Design And Repair For Air-Cooled Heat Pump Equipment

This article studies the design, performance analysis, installation and maintenance for the air-cooled heat pump unitary air conditioner.Air conditioning equipment consumes 30% of the total electricity consumption in a few developed countries. It is important to improve the efficiency of the air conditioning equipment, reduce the usage of material and low down the energy consumption. The traditional designing method is obsolete and not suitable for the present requirement.Air conditioning Load, unit numbers of the chiller, location of the equipment, accessory equipment, and terminal equipment should be considered when choosing the heat pump system, noise and vibration to the surroundings are important factors. To save energy, choose high efficiency chillers, and decide the unit number basing on the part-load condition. The number of water pumps should be synchronized with the chillers. Terminal equipment should have small entropy with large air volume. The good heat exchange environment and the suitable operation method can save energy greatly. For the Heat Pump Equipment Design with choosing Cooling Capacity: 35kW, HeatingCapacity: 38kW, and get Air Volume: 5.053m3 Is, heat exchange area: 154.56m ,dimension for the air cooled condenser, length: 3.09m. height: 0.8m , width: 0.075m,3rows. 2 air fan 152 m3 /min.Statistic Pressure 47Pa, Total Pressure 49.3Pa, SelectAfaLafa Flat Heat Exchanger CB52-58HX, Bristol Reciprocal Compressor H25G144DB, Water Pump 0.75kW, Volume4 m /h, Raising Head 20m, and choose the electric-magnetic valve, single-direction valve, pressure controller, dehumidificationfilter, barometer, etc. to put up the chiller.Automatic control system includes the auto-temperature control, auto anti-freezing control, auto-defrost control, anti-overload protection, voltage-over range protection, diagnose, display systems.The cooling capacity varies with the changes of the environment temperature, flowing out temperature of the cooling water. Cooling capacity increases with the raising of the flowing out temperature, and decreases with the raising up of the air temperature. The energy consumption increases with the increasing of the temperature of the water flowing out of the evaporator, and the environment air temperature. At the heating mode, the heating capacity of the chiller decreases with the heated water temperature increasing or environmental temperature. The consumed power increases with the increasing of heated water temperature, and decreases with the decreasing of the environmental temperature.The article discusses problems for the maintenance and installation, and the ways to solve the common issues.