System and method for metering cooling/heating amount of air conditioners

Abstract

The invention discloses a system and a method for metering cooling / heating amount of fan-coil air conditioners. The system comprises a single chip microcomputer, an inlet / outlet temperature sensor, an inlet relative humidity sensor and an air-volume detection device which are connected with I / O ports of the single chip microcomputer. The method for metering cooling amount comprises: 1) reading the air temperature of an inlet and an outlet, the relative humidity of the inlet and air volume; 2) calculating the moisture content of inlet air; 3) judging whether condensed water exists, changing over to 4) if not or changing over to 7) if so; 4) calculating the enthalpy value of inlet / outlet air with no condensed water; 5) calculating the cooling amount of an S period with no condensed water; 6) accumulating cooling amount; 7) calculating the enthalpy value of the inlet / outlet air with condensed water and the heat of the condensed water; 8) calculating the cooling amount of the S period with condensed water; and 9) accumulating cooling amount. The method for metering heating amount comprises: 1) reading the air temperature of the inlet and the outlet, the relative humidity of the inlet and the air volume; 2) calculating the moisture content of inlet air; 3) calculating the enthalpy value of the inlet / outlet air; 4) calculating the heating amount of the S period; and 5) accumulating heating amount.

Description

Technical field [0001] The present invention relates to a fan coil air conditioner cooling / heat metering system and cooling / heat metering method, in particular to a fan coil air conditioner cooling system using two temperature sensors and only one relative humidity sensor and air volume detection device The invention relates to a heat metering system and a cooling / heat metering method for a fan coil air conditioner calculated by using the enthalpy difference method, belonging to the technical field of heat metering. Background technique [0002] In the past, the cooling / heating metering of fan coil air conditioners generally adopted the following methods: [0003] (1), according to the area of ​​the user's cooling / heating room; (2), according to the time of cooling / heating; (3), according to the temperature of the room. There is no theoretical basis for the above three methods of billing, and they are all billing methods for big pot meals, which is not conducive to energy s...

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Problems solved by technology

[0004] Some also use a cold / heat dual-purpose heat meter installed on the waterway of the fan coil unit of the air conditioner to measure cold / heat. Although this measurement method can directly measure the amount of cold / heat used, it has the following disadvantages: ( 1) The original water supply pipes need to be destroyed during the installation of existing buildings, and the installation is complicated; (2), the cost is high, the one-time investment is large, and the heat meter must be calibrated every five years during use, and the maintenance amount is relatively large. (3) Because the air conditioner operates under a small temperature difference between the inlet and the return water, and the measurement accuracy of the heat meter is very low under the small temperature difference; (4), due to the water quality problem, the household heat meter is easy to block during use

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