Household metering system for cooling capacity of central air conditioner

Abstract

The invention relates to the technical field of heat measurement, in particular to a separated metering system of a central air conditioner. The system comprises a computer hoist machine for providing a management and control platform, central air conditioner terminal controllers and a digital cold calorimeter of a central air conditioner unit, wherein the computer hoist machine is connected with the digital cold calorimeter and the air conditioner terminal controllers through LonWorks interface connection mechanisms to form a control network. The system is characterized in that the control method of the system comprises the following main steps that: central air conditioner terminal equipment controllers carry out time-sharing acquisition of indoor CO2 concentration and the temperature and the humidity of the air at the inlets and outlets of the terminal equipment of the air conditioner system; the enthalpies h1 of the air inlets and the enthalpies h2 of the air outlets of the terminal equipment of the air conditioner system are calculated by using a formula (1) and a formula (2) respectively; at the same time, the mass flow m of the air passing through the terminal equipment is calculated by using a formula (5); quantity W delta T of cold consumed by the terminal equipment within a calculation period is calculated by using a formula (6) and a formula (7) respectively and transmitted to the computer hoist machine; and the computer hoist machine calculates the cold quantity W' to be charged of each piece of terminal equipment according to a formula (8) and stores the W'.

Description

technical field [0001] The invention relates to the technical field of heat measurement, in particular to a household metering system for central air-conditioning cold capacity. Background technique [0002] my country is a large user of central air-conditioning in buildings, and building energy consumption accounts for about 18% to 25% of the total energy consumption in the country. In South China, this proportion has reached 30%. Industry, transportation and other industries eventually occupy the first place in social energy consumption. The energy consumption of central air-conditioning is the main part of building terminal energy consumption, and the number of buildings using central air-conditioning systems is large, and the energy consumption is large. Building strategies are important. [0003] Under the premise of satisfying the requirements of comfort, rational use and control of central air-conditioning is the most effective measure to reduce energy consumption of...

AI Technical Summary

Problems solved by technology

This method has the following deficiencies: 1. It is necessary to establish a fitting equation between the air volume and the power of the fan coil unit through experiments, and the obtained fitting equation cannot be applied to fan coil units of different models or even different manufacturers of the same model. It is very difficult for general designers; 2. It is necessary to equip each user with a power integration device to collect the data of fan coil power consumption in order to carry out cooling capacity household billing. It is obviously redundant for the centralized control and management central air-conditioning system with speed control, because the rated speed and air volume are clearly marked on any fan coil unit, and the rated air volume is directly proportional to the rated speed

[0005] At present, although the central air-conditioning management and control has generally been incorporated into the BAS (Building Automation System), it usually only conducts centralized management and control of major equipment such as fresh air units and air conditioners, and still adopts independent control methods for terminal equipment such as fan coil units, which cannot Realize individual billing, so the current central air-conditioning management and control system usually does not include the cooling billing function, and an independent cooling billing system (including software and hardware) needs to be set up, which increases the complexity of the system , is not conducive to centralized management

The authorized announcement number is CN 1063263C, which discloses a "public central air-conditioning household billing control method and device", wherein, although the described method cleverly uses two-way power supply for the user's air-conditioning fan (equivalent to the coil fan) , that is, when the electric water valve is opened, it is powered by the power converter (power integration device) used for billing, and when the electric water valve is closed, it is powered by the non-billing controller, thus obtaining a relatively accurate heat exchanger ( It is equivalent to fan coil) energy consumption data, but still adopts the above method of fan coil fan power consumption, in addition to the above two shortcomings, there is also the wiring trouble of two power supplies

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