Cálculo BTUs ar-condicionado: veja como realizar

A compra de um ar-condicionado deve considerar a quantidade de BTUs que o aparelho tem. Apesar de costumar passar despercebida, a sigla é importante e garante economia e o resfriamento completo dos ambientes.

Caso você não conheça o termo ou não entenda o porquê deve considerá-lo na escolha do seu ar, convidamos você a continuar a leitura e aprender tudo sobre o assunto. Neste post, reunimos informações sobre o cálculo de BTUs do ar-condicionado, o que considerar na soma e mais.

Vamos começar com a principal pergunta:

Mas o que é BTU?

Presente em todos os tipos de ar-condicionado, o BTU vem do inglês British Thermal Unit (Unidade Térmica Britânica) e se refere a potência de refrigeração ou aquecimento que o equipamento possui. Na prática, isso significa que quanto maior for o número mais potente será o ar.

Por que é necessário calcular os BTUs do ar-condicionado?

Ao realizar o cálculo de BTUs do ar-condicionado, é possível investir no modelo certo e garantir que o produto atenda às necessidades do ambiente. Consequentemente, você não corre o risco de ter um produto que gela excessivamente o cômodo ou então não o resfria totalmente.

Inclusive, se você não sabe o que fazer com o ar-condicionado que não gela, fazer a troca por uma versão com o BTU correto pode ser a melhor solução nos casos de aparelhos que não apresentaram defeitos técnicos.

Como calcular a quantidade de BTU por m²?

Bom, você já entendeu que quanto maior for o ambiente, mais BTU será necessário, mas como saber quantos BTUs por metro quadrado? Para isso, basta realizar uma conta simples e rápida.

Nessa soma, você deverá considerar os metros quadrados, pessoas que usam o cômodo e equipamentos que podem irradiar calor, como televisão e geladeira. Para cada m², pessoa e aparelho, você deverá somar 600 BTUs. Os espaços que ficam expostos ao sol, ganham mais 800.

Por exemplo, em um espaço com 10 m², 3 pessoas e 3 aparelhos que irradiam calor, o ar-condicionado ideal deve ter 9.000 BTUs. O cálculo feito foi: 10 x 600 + 3 x 600 + 3 x 600 = 9.600.

Se a área tivesse contato com o sol, o resultado ganharia 800 e o produto indicado seria o com 11.000 ou 12.000 BTUs.

Você já tem um ar e deseja reduzir a conta de luz? Ensinamos como usar a temperatura do ar-condicionado para economizar energia. Por falar em gastos, o BTU incorreto também contribui para o aumento do gasto de energia.

O que considerar no momento do cálculo de BTUs?

Na hora do cálculo, é necessário considerar os seguintes pontos:

  • Temperatura do local;
  • Exposição do sol no ambiente (o cômodo tem contato direto com o sol?);
  • Metragem do local;
  • Quantidade de lâmpadas;
  • Tipo de lâmpadas, já que a versão incandescente é responsável por maior produção de calor;
  • Pessoas que usam ambiente ou capacidade total de lotação;
  • Aparelhos que irradiam calor (frigobar, fogão, micro-ondas, computador…).

Após a compra, será a hora de colocar o produto, por isso, já preparamos um conteúdo para te ensinar como instalar ar-condicionado.

Para quais espaços o ar-condicionado de 12 BTUs é indicado?

Os modelos com 12.000 BTUs costumam ser ideais para áreas residenciais com até 20 m² e comerciais com até 15 m². Geralmente, quartos, escritórios e salas possuem a metragem e recebem bem o tipo de ar-condicionado.

Quantos BTUs são necessários para 50 m²?

Considerando o cálculo de quantos BTUs por metro quadrado, um espaço residencial com 50 m² deve ter um ar-condicionado de 30.000 BTUs. Um ambiente comercial do mesmo tamanho deverá receber um aparelho com 40.000 BTUs.

BTUs: confira a tabela de ar-condicionado por m²

Para facilitar ainda mais a sua compra, preparamos uma tabela de ar-condicionado por m². Nela, você encontra a metragem do ambiente e quantos BTUs serão necessários para atender as necessidades do espaço.

Confira:

Total de m²Ambiente ResidencialAmbiente Comercial
9 m²7.000 BTUs7.000 BTUs
12 m²7.000 BTUs9.000 BTUs
15 m²9.000 BTUs12.000 BTUs
20 m²12.000 BTUs16.000 BTUs
25 m²15.000 BTUs20.000 BTUs
30 m²18.000 BTUs24.000 BTUs
35 m²21.000 BTUs28.000 BTUs
40 m²24.000 BTUs32.000 BTUs
45 m²27.000 BTUs36.000 BTUs
50 m²30.000 BTUs40.000 BTUs
60 m²36.000 BTUs48.000 BTUs
70 m²42.000 BTUs56.000 BTUs

Vale lembrar que a tabela está considerando apenas os metros quadrados do cômodo. Por isso, no momento da compra, será necessário considerar ainda outros pontos que influenciam no resfriamento do ambiente em questão, como a quantidade de pessoas que circulam no local e incidência solar.

Após instalado, não esqueça de manter a frequência de manutenção do ar-condicionado e realizar a limpeza da máquina da forma correta, ambos interferem na capacidade do produto.

Prontinho, agora você já sabe como fazer o cálculo de BTUs do ar-condicionado e temos certeza que vai investir no modelo certo. Se ainda tiver dúvidas sobre o assunto, basta compartilhar nos comentários que vamos respondê-las para você.

Até mais!

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