Transcript
HEATING-COOLING STUDY SHOWROOM GUADALIX DE LA SIERRA
Calle Jose Hierro 6 28702 San Sebastian de los Reyes (Madrid) Tlf móvil: 699244937 www.solucciona.es
[email protected]
HEATING-COOLING STUDY SHOWROOM
INDEX Project description……..…………………...…………..........................3 Technical characteristics of the equipment and systems ……………....4 Calculations of thermal demand for heating and cooling housing..….10 Clarifications..…..............................................................................12
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Project description In this report, it is presented the study of heating-cooling showroom located in Guadalix de la Sierra, belonging to the company 100x100 Madera. For heating and cooling an aerothermy system is used. The radiation equipments used in the showroom system, is a heating and cooling underfloor and water coil connected to ventilation system of Siber . Aerotherm Saunier Duval Genia Air 5 The system of aerothermy is responsible for providing domestic hot water (DHW) heating and cooling housing. For DHW is installed a water tank with capacity of 200 L. This tank has got a coil that receives heating fluid from the system of aerothermy. This way is possible to heat water for consumption. The aerotherm used two different systems to radiate heating and cooling: 1- Heating and cooling underfloor of Schlutter-Bekotec, situated in the kitchen. This system lets heat or cools the kitchen and room enclosed to it. 2- Water coil located in the air ventilation duct Siber. The system works by introducing the hot or cold heat transfer fluid from the system aerothermy. It let to heat or cools the air that come in to the house; increasing or decreasing the temperature of different rooms. During the winter, the hot fluid is introduced in this coil resulting in increased the temperature of the air introduced into the housing leading to heating thereof; while in summer we introduce cold fluid in the coil, causing it to decrease the temperature of the air entering inside the house leading to the cooling of the same. The air insufflations system of Siber, is responsible to introduce outside air into every room except the bathroom and kitchen (wet areas). For it we can heat or cool these rooms using this system. Biomass stove CS Thermo Tesi 9 Kw (canalized) The showroom has got a biomass stove Italian. The brand of this equipment is CS Thermo model Tesi 9 Kw. This system is canalized. It takes air for combustion from outside, making the system does not impair the operation of air renewal system of Siber.
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Technical characteristics of the equipment and systems Heat pump air / water reversible Genia AIR 5 Kw Firstly is showed the technical´s characteristics of aerothermy Saunier Duval model Genia Air 5. The system has a heat pump 5 Kw, which provide heat to heat water in a tank of 200 L or provide cold or heat for heating or cooling the showroom. For this, the system has a hydraulic module (Genie Alone) can handle hot or cold water, through a 20 liter tank, giving the system a certain inertia. This hydraulic module is connected to the radiators, which as mentioned above are the kitchen floor and water coil. Finally, we mention that the management of heating and DHW temperature control is performed through Exacontrol, wireless control system. Then the scheme operating system aerothermy Saunier Duval with issuers heating and cooling (water coil in Siber system and floor heating-cooling) is shown below:
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Biomass stove CS Thermo Tesi 9 Kw (canalized) As mentioned, it is installed a biomass stove stake of CS Thermo brand model Tesi 9 kw. The total power radiation of hot air is 9 kw, which thanks to the modulation of the stove can lose up to 3 kW. The model produces hot air is expelled to the central room of the house and through a outputs ducted warm air toilet. The biomass stove takes air for combustion of pellets from the exterior of the house. Following, it shows the technical characteristics of the system.
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Heating and cooling under floor System from Schultter-Bekotec A heating-cooling under floor system is used in the kitchen´s showroom floor of SchlutterBekotec brand. This system has been made using cross-linked polyethylene tube of 14 mm, with a distance between tubes of 75 mm and using the novel ultrafine Schlutter system consisting in using a thin slab making the total installation reaches 31 mm plus develop the ground up to be placed, in this case stoneware. A detail of such a system is presented in next figure. Water coil air exchange system Siber As mentioned, the housing includes a heating-cooling water through a water coil connected to the system aerothermy. The battery is brand BFT 200-3-2.5 Siber model.
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Calculations of thermal demand for heating and cooling showroom Thermal heating demand and justification The calculation made by RC Architects about thermal heating demand, shows a value of 1.488 W for total housing 100 m2 (14.88 W/m2). To compensate for these heat losses were installed in housing two heating systems: -
CS Thermos stove 9Kw biomass. This biomass stove in the lounge of the house, can be ducted, allowing warm air to enter the bath house. With this system we can get to cover 1.488 W thermal demand of housing. However, being located at a particular point of the home, areas that are further away from the stove can present problems of discomfort. Therefore has introduced other heating system shown below.
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System aerothermy Saunier Duval Genia Air 5. With this system we heat water to be used as heat transfer fluid for heating the house through broadcast systems that are located in the housing; as is the underfloor located in the kitchen and the water coil placed in the Siber system in the insufflation of air into the housing. Below we show the characteristics of heating systems broadcast in working conditions: Floor heating: floor heating is located in the kitchen of the house, with a total area of 18 m2. Whereas the flow temperature of hot water from the system aerothermy is 35 °C and the temperature in the (kitchen) is 20; would have a temperature differential of 15 ° C. Given the nature of underfloor Schluter-Bekotec mark (see graphic below) . Under these conditions, and considering that the spacing of the tubes is 8 cm; we can say that the heat load of the underfloor heating is 100 W/m2; for example 1.800 W of total emission. As in the case of biomass stove, the heat release would be located at a point of the housing. Therefore, another system has been used emission as the water coil is located in the air inflation system of the brand Siber.
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Calculating heat load of the underfloor heating
Siber water battery: Battery Siber water system is located at the entrance of air insufflation in the house, once this air has passed through the heat exchange system of Siber system. Thus, once the insufflation air temperature has risen due to heat the air that is drawn into the housing; the temperature rises a little more because we make this air through a water coil which is fed with hot water from the system aerothermy. Whereas the flow of air entering the house is 250 m3/ h, with a temperature of 7.5 ° C and water is introduced into the battery at 55-50ºC (this water is heated by the system aerothermy) with conditions set forth in the following table, the temperature of air introduced in the housing would be about 34 ° C, with a power of 2.4 kW. Therefore, thanks to the water coil, we are able to cover the heat demand of housing that has been estimated at 1.48 Kw.
Table of technical characteristics of the water coil Siber working in heating mode
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In addition, through the vents air insulation, the heat is distributed by the different rooms of housing in areas such as air insufflation 3 rooms, lobby and lounge. This water coil allows us not only to cover the heating demand, but it is to be distributed by different rooms of the house following the squeme supplies to Siber company. Thermal cooling demand and justification The calculation made by RC Architects about thermal heating demand, shows a value of 1.083 W for total housing 100 m2 (10.83 W/m2). To compensate for these heat losses were installed in housing two heating systems: - System aerothermy Saunier Duval Genia Air 5. With this system we heat water to be used as heat transfer fluid for cooling the housing through issuance systems that are located in the housing; as is the underfloor cooling located in the kitchen and the water coil placed in the Siber system in the insufflation of air into the housing. Below we show the characteristics of cooling systems broadcast in working conditions: Underfloor cooling: the underfloor cooling is located in the kitchen of the house, with a total area of 18 m2. Whereas the flow temperature of hot water from the system aerothermy is 18 ° C and the temperature in the (kitchen) is 24 ° C; would have a differential temperature of 6 ° C. Given the nature of the cooling floor of the SchluterBekotec mark; under these conditions, and considering that the spacing of the tubes is 8 cm; we can say that the heat load of the underfloor cooling is 15 W/ m2; for example 780 W total emission.
Calculating heat flux density for cooling underfloor cooling
As you can see, with input solely from underfloor cooling we would not be able to meet the demand for cooling of the showroom and also the emission of cold would be located at a point of the house so it is necessary to implement other broadcast system as is the water coil located in the air insufflation system of Siber brand. Siber water battery: Battery Siber water system is located at the entrance of air insufflation in the house, once this air has passed through the heat exchange system of Siber system. Thus, once the insufflation air temperature has dropped through the exchange with the fresh air leaving the house; the temperature is lowered a bit because
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we make this air through a water coil which is fed with cold water from the system aerothermy. Whereas incoming airflow to the house of 225 m3/ h, with inlet air temperature of 30 °C and cold water is introduced into the battery at 6 °C (the water cools the system aerothermy) with the conditions set in the following table, the temperature of air introduced in the housing would be about 16.2 °C, with a power of 1.6 kW. Thus, thanks to the water coil, we are able to meet the thermal cooling demand in housing that has been estimated at 1.08 Kw. In addition, through the vents blowing air, this cold air is distributed by the different rooms (see squeme to Siber system distribition) of housing in areas such as air insufflation 3 rooms, lobby and lounge. Therefore, the water coil allows us not only to cover the heating demand, but it is to be distributed by different rooms of the house.
Table of technical characteristics of the water coil Siber working in cooling mode
Clarifications In this part we need to explain some clarifications showed following: - The first comment that we need to do is regarding to the different working temperatures between the heating-cooling underfloor system and the Siber battery. How you can check in the text, to get heat or cool from both system, we used different working temperature. It is due to reduce malfuction in the working of system. For example, if we introduce cool water below 12 ºC; in the underfloor system in the summer; it possible to have condesantion problems in the showroom. However, to get more efficiency in the battery of Siber, it is neccesary to introduce water to 6ºC. In order to eliminate this problem, we have intriduce a mixture valve that let us introduce water in the coil of Siber to 6ºC simultaneously to introduce water in underfloor to 18ºC. - On the other hand, we should mention that temperature losses in the system of air insufflation Siber, are void for two reasons, firstly the low path to do the air and despite the existence of losses, would be taken into stocks so help to reduce the air temperature in the room.
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- Finally, we must to mention that the Siber system has got a Night Cooling System used during summer. This automatic system let us to introduce cool air into the showrrom, during the night. This way, we can decrease the temperature of the house. This efects has not cosidered in our calculations, however it will be an aportacion important to lower the temperature of the showroom. En Madrid a 12 de Abril del 2015.
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