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Heat Pumps for Heating and Cooling Hot water produced in the heat pump at a temperature of 120oF is pumped through the heating coil. The heating coil is generally 2 rows deep. Chilled water produced in the heat pump in the temperature range of 40o to 60oF is circulated through the cooling coil. The cooling coil is generally 3 or 4 row deep with a drip pan below to collect the moisture condensate. The reason for extended surface area of cooling coil is that the moisture removal from air (known as latent cooling) is critical in maintaining proper comfort conditions besides cooling. Moisture is removed by operating the heat exchanger below the dewpoint* temperature of the room’s air. *Note, the dewpoint temperature of air is the temperature at which the air cannot absorb and hold any more moisture. When it reaches the dewpoint temperature, the air is said to be “saturated” with moisture. Any further cooling of the air results in liquid water droplets being formed on any surface that causes this cooling. While dew formation is a perfectly natural and expected condition on outside surfaces such as a lawn in early morning, it can cause very undesirable results when it unexpectedly shows up on interior building surfaces. Thus, intentional moisture removal from inside air should only occur in properly designed chilled water terminal units that contain a “drip pan” to catch the resulting condensation and route it to a suitable drain. 5.10. Control and auxiliary equipment Appropriate operation of the heat pump requires a control system. There are several devices to be controlled in heat pump systems, such as the compressor, fans and reversing valve. One of the main control devices of the heat pump system is a thermostat. Usually, there is a two-stage thermostat which allows the heat pump to operate under normal conditions. When the compressor cannot produce enough heat for a building, the two-stage thermostat will turn on an auxiliary backup heating system. A room thermostat enables the operation of the heat pump at the desired level, consisting mainly of a temperature dial, temperature indicator, fan switch and system switch. Temperature dial enables the user to decide the set point for the temperature manually. The temperature indicator shows the current temperature of the room. The operation of a fan can be controlled by a fan switch and it can have an ON-mode, CLOSE-mode or AUTO-mode, for instance. The system switch allows the user to use the heat pump as a cooling or heating system. There is also an AUTO setting to ensure that the heat pump can automatically decide the cooling or heating mode. 85PDF Image | Heat Pumps for Heating and Cooling
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