Two-pipe air conditioning unit capable of simultaneously supplying cold and hot in winter

Abstract

The invention discloses a two-pipe air conditioning unit capable of supplying cold and heat simultaneously in winter. Comprising a fresh air pipe, an air return pipe, a bypass air pipe, a fan, a primary filter, a medium-efficiency filter, a fresh air regulating valve, an air return regulating valve, a bypass air electric regulating valve, a straight-through electric regulating valve, a temperature sensor I, a temperature sensor II, a temperature sensor III, an electric regulating water valve, an anti-freezing switch, a pressure difference sensor I, a pressure difference sensor II, an air supply pipe and a cold and hot water coil pipe. The four-pipe unit has the beneficial effects that in winter, a natural cold source is fully utilized to remove indoor inner area heat loads, energy is saved, meanwhile, the initial investment of an air conditioning system in order to meet simultaneous cooling and heating in winter is reduced, and the risk that a hot water coil pipe is frozen to crack due to the fact that a conventional four-pipe unit reduces the opening degree of a water valve of the hot water coil pipe in order to reduce the air outlet temperature is reduced.

Description

technical field [0001] The invention relates to a two-pipe air-conditioning unit, in particular to a two-pipe air-conditioning unit that can replace a four-pipe air-conditioning unit to realize simultaneous heating and cooling in winter, and belongs to the technical field of HVAC equipment manufacturing. Background technique [0002] In winter, four-pipe air-conditioning units are generally designed in high-end office buildings and high-end hotel inner areas (such as banquet halls and office areas with large depths) in the northern region to cope with changes in cooling and heating loads, which can realize heating and cooling at the same time. [0003] However, for this kind of air-conditioning unit, it is impossible to make full use of the natural cooling source to remove the heat load in the indoor area in winter, which leads to a waste of energy. The risk of freezing and cracking the hot water coil due to the reduction of the opening of the water valve of the hot water co...

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Problems solved by technology

[0003] However, for this kind of air-conditioning unit, it is impossible to make full use of the natural cooling source to remove the heat load in the indoor area in winter, which leads to a waste of energy. The risk of freezing and cracking of the hot water coil due to the reduction of the opening of the water valve of the hot water coil due to the conventional four-pipe unit reducing the outlet air temperature

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