How to choose a factory recuperator for a country house

How to effectively use the temperature of the exhaust air that is simply discharged into the atmosphere? How to choose a device that will recover heat and thereby save energy costs for heating? This article will focus on factory recuperators.

How to choose a factory recuperator for a country house

The desire to save energy often leads to the fact that the house becomes practically a thermos, which keeps heat due to thermal insulation. In such houses, a supply and exhaust ventilation system must be provided, otherwise the residents will have to breathe exhaust air, which will affect their health. The basis of ventilation is a system of air intake and exhaust channels, on the basis of which individual microclimate systems can be created by connecting various devices and filters. The forced ventilation system is driven by an air handling unit (PVU), which may contain an integrated recuperator.

As you learned from the previous article, a recuperator is part of the ventilation system of a room. Like any other engineering system (heating, plumbing, electrics), it can be entrusted to professionals who will calculate, deliver, deliver and give a guarantee. In this case, we shouldn’t even think about the choice – the specialists will offer the best and you just have to pay for their services. In this article we will show you how to get an approximate result without overpaying..

Dantherm HCH 5 Dantherm HCH 5

It should be immediately noted that the recuperator is an auxiliary device. It prepares the air, bringing it to the required state. As you know, air conditioners and heaters consume a lot of energy to heat or cool the air. The work of a factory (or home-made) recuperator requires very little energy, and sometimes it even happens in a natural way. Due to this, the approach of the initial temperature to the specified one even by 2-3 degrees already becomes profitable in the end – less powerful devices have to work.

Some vital rules for self-installation of supply and exhaust ventilation ducts:

  1. The air from the kitchen and bathroom is “charged” with impurities, therefore, before entering the air handling unit, it must be cleaned using duct filters.
  2. The air intake from the kitchen must be connected to a kitchen hood with a filter.
  3. When creating a home-made system on fans (without an air handling unit), select fans with the lowest noise level and the so-called duct mufflers.
  4. The estimated time for a complete air exchange in the room is 1 hour. Choose fans of the appropriate performance.

Depending on which option is chosen – a factory supply and exhaust unit (PVU) or a home-made one on fans, further actions will be divided into:

  1. Selection of a factory PVU with an integrated recuperator and its integration into the finished system.
  2. Choosing a factory recuperator and installing it in the system.

Calculation principle when selecting a PVU with a recuperator

In both cases, we will have approximately the same calculations. At the head of the table is performance or air consumption. Productivity is the amount of air passed per unit of time. Measured in cube. m / hour. To find this indicator, we calculate the air volume of ventilated rooms and add 20% (for the resistance of filters, grilles). The resistance of the built-in recuperator is already taken into account in the unit’s passport data.

Dantherm HCV 5 Dantherm HCV 5

Attention! When self-calculating, rounding and tolerances should be made with an increase in the direction of the margin (power, productivity, volume).

Consider a country house with 2.4 m ceilings as an example, 2 bedrooms are served (12 m2), living room (20 m2), bathroom (6 m2) and kitchen (12 m2).

Total air volume: (2 12 + 20 + 6 + 12) 2.4 = 148.8, take 150 m3.

Note.The choice of a more powerful unit is justified if it is possible to increase the area of ​​the premises and to increase the resource of the unit..

Air handling units with built-in recuperators

Index PVU model
VUE 100 P mini VUT 200 G mini VUT 400 EH EC ECO Dantex DV-350E DAIKIN VAM350FA Dantherm HCV 5
Manufacturer “VENTS”, Ukraine “VENTS”, Ukraine “VENTS”, Ukraine Dantex, England Daikin, Japan Daitherm, Denmark
Productivity, m3/hour one hundred 200 450 350 350 520
Energy consumption (without heater), W 86 116 300 140 200 350
Recuperator type Plates, paper Plates, aluminum Counterflow, polystyrene Counterflow, polymer Counterflow, aluminum Plates, bimetal
Recovery efficiency, up to% 68 85 98 88 92 95
Note Coarse filters G4 filters, heating optional Filters G4, F7, heater 3 operating modes, filters Fully automatic, replaceable filters Full automation, room version
Price, rub. 13800 16500 20800 32200 61700 85600

VUE 100 P mini VUE 100 P mini

For those who fundamentally do everything with their own hands, system performance calculations will relate to fans built into the channels. Their performance should already be calculated when designing (calculating) the channels, depending on the volume of air. To select the appropriate recuperator, we calculate the total performance of the fans operating in the supply to the heat exchanger and subtract 25% (for the system resistance, variable cross-section and synchronous operation). One duct fan must also be installed at each inlet and outlet of the recuperator..

For our example:

  • 1 supply and 1 exhaust fan are installed for each room;
  • required performance of each fan:
    • Bedroom 1: 12 2.4 = 28.8 + 20% = 34.56, we accept 35 cubic meters. m / hour
    • Bedroom 2: 12 2.4 = 28.8 + 20% = 34.56, we accept 35 cubic meters. m / hour
    • Living room: 20 2.4 = 48 + 20% = 57.6, we accept 58 cubic meters. m / hour
    • Kitchen: 12 2.4 = 28.8 + 20% = 34.56, we accept 35 cubic meters. m / hour
    • Bathroom: 6 2.4 = 14.4 + 20% = 17.28, we accept 18 cubic meters. m / hour
  • total cumulative performance of system fans: 35 3 + 58 + 18 = 181 cubic meters m / hour;
  • recuperator load: 181 – 25% = 181 – 45.5 = 135.75, we accept 150 cubic meters. m / hour.

Factory heat exchangers

Index Recuperator model
KORF PR 40-20 VERTRO KR 40-20 NED REC 40-20 Remak Vento HRV 40-20
Manufacturer Russia Russia The EU Czech Republic
Productivity, m3/hour from 1000 from 1000 from 1000 from 1000
Recuperator type Plates, aluminum Channel, aluminum Plates, aluminum Plates, aluminum
Recuperation efficiency / efficiency, up to% 70/60 70/60 70/60 70/60
Price, rub. 17400 18000 18220 20400

Question: What do the numbers 40–20 mean in the marking of factory recuperators?

Answer:Dimensions of supply and outlet ducts in millimeters. 40–20 – minimum dimensions of factory heat exchangers.

When installing such a device in a cold place, for example, in the attic, remember that it and the air ducts should be insulated.

Another type of recuperators is autonomous channel heat exchangers. They are also called ventilators. These devices serve only one room and belong to the so-called decentralized ventilation system. They do not require calculations, it is enough to choose a model for the volume of the room.

Tempero 100T Tempero 100T

Air ventilators

Index Duct ventilator model
Manufacturer Ukraine Ukraine Italy Germany Germany
Productivity, m3/hour up to 125 60 62 68 45
Energy consumption (without heater), W 7-32 3-12 12-32 3.5-18 8.5
Recuperator type Plates, polymer Plates, bimetal Channel, aluminum Plates, bimetal Channel, bimetal
Recovery efficiency, up to% 67 58 65 70 55
Note Remote control, “winter start” 4 modes, 2 filters 32 dB, 5 modes 40 dB, G4 filters Sint. filter, 54 dB
Price, rub. 9 300 10200 14000 24500 43200
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