Comparison Of HRV And ERV
1. What is the difference between HRV and ERV?
The cooling capacity in air conditioning is divided into sensible cooling capacity and latent cooling capacity. The performance of sensible cooling capacity is the decrease of dry bulb temperature, and the performance of latent cooling capacity is the decrease of wet bulb temperature or relative humidity.
HRV and ERV are mainly used for energy saving in air conditioning. The energy recovery of total heat exchanger includes sensible heat transfer energy and latent heat exchange, so the efficiency of total heat exchanger is higher than sensible heat exchanger. But in extreme conditions, when the indoor humidity is high and the outdoor temperature is low, dew point temperature of indoor air will appear.
2. Structural difference between total heat exchanger and sensible heat exchanger.
Heat recovery ventilator is a kind of heat exchanger, which can only exchange heat, not humidity. Energy recovery ventilation can exchange heat and humidity, each has its own advantages. Heat recovery ventilator dehumidification is not obvious, energy recovery ventilation dehumidification is more precise dehumidification, energy recovery ventilation dehumidification is more obvious. The most fundamental function of the two is to change fresh air, and the dehumidification is only an auxiliary function. If you want to dehumidify fundamentally, of course, the dehumidifier is the best.
The only difference between HRV and ERV system is the filter core. The sensible heat is the aluminium core and the total heat is the paper core. According to certain principles, sensible heat is better than total heat, sensible heat Aluminium core is anticorrosive and easy to rinse. It has long service life and extrusion resistance. The hot paper core is corroded by moisture and dust in the air, which clogs the vent and cannot be cleaned. This leads to poor ventilation effect, no effect of dehumidification, the simplest way to deal with it is to change the paper core.
Energy recovery ventilation r is to make the medium of different temperatures for cold and hot transformation, its function is to achieve the use of different media through the heat exchanger temperature, no matter where the installation of equipment as long as it can be used.
During the summer operation, the fresh air is cooled from the air conditioning exhaust to reduce the temperature, while the air conditioning is dried to reduce the moisture content of the fresh air. During winter operation, fresh air obtains heat from air exhaust of air conditioning room, and the temperature rises, and meanwhile is humidified by air exhaust of air conditioning room.
The difference between HRV and ERV is the effect on humidity. If you do not have too high requirements for humidity then choose sensible heat, on the contrary, choose full hot fresh air ventilator.
Energy recovery ventilation is an energy-saving equipment for air conditioning exhaust energy recovery. Its main components are outer shell, heat exchange core and filter.
As the heat transfer core is made of materials with heat transfer and permeability properties, exhaust air can be used to pre-cool and dry fresh air in summer and preheat and humidify fresh air in winter when applied to the air conditioning system. It can significantly reduce the fresh air load, thus saving energy consumption of hot and cold system, which is beneficial to small system scale, saving operation cost and reducing peak power consumption. The total heat exchange efficiency and the structural characteristics of the heat exchange core. The air volume ratio of two streams of air passing through the core is related to the inlet air parameters.
Generally speaking, there are more energy recovery ventilations in southern China and more heat recovery ventilators in northern China.